standard method of measurement for concrete...

Standard Method of Measurement for Concrete Repair

Third Edition 2015

INDEX

INTRODUCTION

3

Section 1: PRELIMINARIES

5

Section 2 : PREAMBLES

8

Section 3 : NOTES ON REPAIR MEASUREMENT including illustrations

10

Section 4 : METHOD OF MEASUREMENT

14

General, Trials and Routine Testing

15

Surface Cleaning

15

Survey

16

Repairs

18

Crack Repairs

20

Pore/Blow Hole Fillers

21

Levelling Mortars/Fairing Coats

22

Surface Coatings and Treatments

23

Resin Injection

24

Section 5 : SPECIMEN BILL OF QUANTITIES with pages for personal user notes

25

This document was originally prepared by the Technical Committee of the Concrete Repair Association under the Chairmanship of A J Parker, ARICS and first published in 1990. It is extensively used and was revised and updated to the Second Edition in 1997. This Third Edition of the Standard Method of Measurement for Concrete Repair contains updates to incorporate relevant item coverage rules common to other methods of measurement within the construction industry. It is intended that the updated version provides a clear and concise Method of Measurement that will be familiar to current users whilst also clarifying ambiguities from previous editions. Although care has been taken to ensure, to the best of our knowledge, that all data and information contained herein is accurate to the extent that it relates to either matters of fact or accepted practice or matters of opinion at the time of publication the Concrete Repair Association assumes no responsibility for any errors in or misinterpretations of such data and/or information or any loss or damage arising from or related to its use.

1997 : The Concrete Repair Association ISBN 0 9515430 7 5 Standard Method of Measurement for Concrete Repair (pbk) First Edition May 1990 Second Edition April 1997 Third Edition August 2015 Concrete Repair Association Technical Committee 2015 Trevor Box (Chair) Birmingham City Laboratories Daren King Concrete Repairs Ltd Terry Davies Volkerlaser Ltd

INTRODUCTION

The Concrete Repair Association first produced the “Method of Measurement for Concrete Repair” document in 1990. The document was compiled with the support of FeRFA (The Federation for the Repair and Protection of Structures) many of whose members are, like those of the Concrete Repair Association, involved in concrete repairs and associated specialist activities.

The Concrete Repair Association was also represented on a working party of the Concrete Society to produce a comprehensive model specification document for patch repair to reinforced concrete, being an update of an earlier document, and this included a section on measurement of repairs and was first issued in 1991. The Concrete Repair Association and the Concrete Society took care to ensure that the principles of the methods of measurement were compatible so as to produce a uniform approach within the industry.

The Association issued ‘User Notes’ within a ‘Revision and Addendum’ leaflet issued in October 1994. This was appropriately incorporated into the updated Second Edition of the main document in 1997. The Third Edition was developed in 2013 to incorporate changes thought appropriate following useful feedback from users of the 2nd Edition and also take into account the requirements of other Methods of Measurement commonly used within the industry such as SMM7 and CESMM3.

The method of measurement includes for such activities as provision of access, surface cleaning, testing, repair items, surface treatments, etc., and these are treated using principles common in other areas of building, civil and structural engineering.

With reference specifically to the Repair items within the method of measurement:

a) A single item will include work and materials to complete the repair, e.g. avoiding feather edges, breaking out the existing concrete, cleaning and protection of reinforcement where exposed, applying the bonding coat and reinstating with mortar.

b) Repairs are measured separately according to the orientation of the surface on which they occur, e.g. soffits of slabs are measured separately from vertical surface of walls; arrises of columns are measured separately from arrises of beams.

c) Flat repairs are measured separately from those which contain an arris. d) Repairs are generally measured by number in bands of surface area and maximum depth. In

the case of arrises they are measured by length or number in bands of girth and maximum depth.

Patch repairs, as their name implies, are usually small individual items and the vast majority of repairs should fall into one of the specified area bands and enumerated. However, larger individual repairs are measured by area. The sub-divisions into different orientations, repair types, areas and depth can lead to a large number of item descriptions. For instance, when fully using the various depth bands and the area bands and taking account of possible sub-divisions for vertical and horizontal surfaces and also for repair items to arrises, this can produce in excess of one hundred different items of repair. However, it has been found that the system is simple to operate and it is expected that in practice most projects will be covered by thirty or forty items in total.

The specimen Bill of Quantities is in abbreviated form and is for guidance only. There is a space for those using the document to include their own detail notes on the facing pages headed “User Notes”. The preamble item “Bill of Quantities” states that “Bill of Quantities shall fully describe and accurately represent the quantity and quality of works to be carried out”.

In concrete repair contracts it is difficult to accurately quantify the amount of work at the time when the contract documents are being prepared. The depth and area of a particular concrete repair item

cannot usually be determined until breaking out is complete. The Bill of Quantities can therefore be regarded as approximate, the accuracy of the quantities depending upon the degree of initial survey and sampling and testing data available prior to production of the Bill of Quantities document. This should be made clear to all parties involved with the contract. To attempt to overcome some of the difficulties associated with this situation, where remeasurement is inevitable, and this method of measurement itemises time related elements such as provision of access and site facilities. These can then be adjusted as necessary if the quantity of work should differ substantially from that shown in the documents, dependent upon the conditions of contract.

If there are limitations on the amount of work which can be carried out at one time, resulting from, for example, the extent of scaffolding permitted, it may be necessary to sub-divide the bill to reflect the phasing of the work.

To reflect the variation in cost with height above ground related to the time taken for the workforce and materials to get to the place where work is being carried out, particularly in the case of access by cradle, work can be sub-divided into height bands above ground. However, this can lead to a proliferation of different items and subdivision by height above ground needs to be considered on its merits for each case and only used in appropriate circumstances.

There are other occasions when sub-division is appropriate, for example, in cases of reduced headroom or confined working space.

The method of measurement is ideally suitable for use with computerised systems for surveys, bill of quantities production, schedule of rates pricing and re-measurement and valuation of completed

works.

SECTION 1: PRELIMINARIES

GENERALLY

Project, parties and consultants

1. The name, nature and location of the project shall be stated.

2. A general description of the works shall be given.

3. The names and addresses of the Employer and consultants to be named in the contract shall be given.

4. The names and addresses of any other consultants shall be given.

5. The address where drawings and other documents may be inspected by appointment shall be given.

Description of Site

1. Information to indicate the boundaries of the site, the means of access and the position of the works shall be given.

2. Attention shall be drawn to any drainage, water, gas, power, communications and other services known to exist on or over the site.

3. Attention shall be drawn to any adjacent or abutting buildings including 3rd Party Stakeholders and any restrictions they may impose.

4. Information to facilitate visiting the site shall be given.

Drawings

1. A list shall be given of the drawings from which the bills of quantities have been prepared and which will be available for inspection by the Contractor. The list shall indicate the location drawings which shall accompany the bills of quantities.

CONTRACT

Form, type and conditions of contract

1. Where the conditions of contract are standard and published for general use, particulars of the edition to be used and a schedule of the clause headings shall be given. Where the standard conditions provide for alternative or optional clauses, the clauses which are to apply shall be stated. Amendments to standard conditions shall be given in full.

2. Where the conditions of contract are not standard and published for general use, the conditions shall be set out in full in the bill of quantities or a schedule of clause headings shall be given where a full set of conditions is supplied with the bill of quantities. In either case where the conditions provide for alternative or optional clauses the clauses which are to apply shall be stated.

3. Where there is an appendix to the conditions of contract requiring insertions to be made, a schedule of the insertions shall be set out in the bill of quantities.

Contractor's Liability

The following shall be given. 1. Contractor's liability for risk or injury to persons and property and of damage to the works.

2. Where the Employer requires the Contractor to effect insurance in respect of the Contractor's liability for any such risk, the relevant particulars shall be given.

3. Where the Employer intends to relieve the contractor of liability for any such risk, the relevant particulars shall be given.

Employer's Liability

1. Where the cost of insuring any liability of the Employer is required to be included in the contract sum such cost shall be given as a provisional sum.

Local Authorities' Fees and Charges

Unless the conditions of contract otherwise provide the following shall be given as provisional sums: 1. All fees and charges which the Contractor is required to pay to local authorities.

2. Rates on all temporary buildings.

Obligations and Restrictions Imposed by the Employer

Particulars shall be given of any obligations or restrictions to be imposed by the employer in respect of the following: 1. Access to and possession or use of the site.

2. Limitations of working space.

3. Limitations of working hours.

4. The use or disposal of any materials found on site.

5. Hoardings, fences, screens, temporary roofs, temporary name boards and advertising rights.

6. The maintenance of existing live electricity, drainage, water, gas, power, communications and other services on or over the site.

7. The execution or completion of the work in any specific order or in sections or phases.

8. Maintenance of specific ambient conditions. Alternatively a provisional or prime cost sum shall be given.

9. Temporary accommodation and facilities for the use of the Employer including heating, lighting, furnishing and attendance.

10. The installation of telephones for the use of the Employer and the cost of his telephone calls shall be given as a provisional sum.

11. Time of year the works are due to commence or other obligation or restriction.

General Facilities & Obligations

For convenience in pricing, items for the following shall be given. Maintaining temporary works, adapting, clearing away and making good shall be deemed to be included with the items. Notices and fees to local authorities and public undertakings related to the following items shall be deemed to be included with the items.

1. Plant, tools and vehicles.

2. Scaffolding and hoisting.

3. Site administration and security.

4. Transport for work people.

5. Protecting the works from inclement weather.

6. Water for the works. Particulars shall be given if water will be supplied by the Employer. It shall be stated if water generated by the works is to be collected, treated or disposed of off site.

7. Lighting and power for the works. Particulars shall be given if power will be supplied by the Employer.

8. Temporary roads, hardstandings, crossings and similar items.

9. Temporary accommodation for the use of the Contractor.

10. Temporary telephones for the use of the Contractor.

11. Traffic regulations.

12. Safety, health and welfare of work people.

13. Maintenance of public and private roads.

14. Removing rubbish, protective casings and coverings and clearing the works on completion.

15. Drying the works.

16. Temporary fencing, hoardings, screens, fans, planked footways, guardrails, gantries and similar items.

17. Control of noise, pollution and all other statutory obligations.

Contingencies

1. Any provision for contingencies shall be given as a provisional sum.

SECTION 2: PREAMBLES

Introduction

This Method of Measurement provides a uniform basis for measuring concrete repair works and embodies the essentials of good practice but more detailed information than is required by this document shall be given where necessary in order to define the precise nature and extent of the required work.

Bill of Quantities

1. Bills of quantities shall fully describe and accurately represent the quantity and quality of the works to be carried out. Work which cannot be measured shall be given as a provisional sum. Work, the extent of which is not known, shall be described as provisional or given in a bill of approximate quantities.

Measurement

1. Where minimum deductions of voids are dealt with in this document they shall refer only to openings or wants which are within the boundaries of measured areas. Openings or wants which are at the boundaries of measured areas shall always be the subject of deduction irrespective of size.

2. Where classification is given in this document as being between two limiting dimensions then the interpretation shall be as exceeding the first dimension and not exceeding the second.

3. Depths of repairs are to be measured as maximum depths.

4. Unless stated in the item description, rates are not deemed to include the removal of sound material to provide a uniform shape in plan e.g. squaring off repairs.

Item Descriptions

1. The order of stating dimensions in descriptions shall be consistent and generally in the sequence of length, width and depth.

2. Unless otherwise specifically stated in the bill or herein, the following shall be deemed to be included with all items:-

a) Labour and all costs in connection therewith.

b) Materials, goods and all costs in connection therewith.

c) Fitting and fixing materials and goods in position.

d) Plant and all costs in connection therewith.

e) Dust suppression and associated costs.

f) Waste of materials including disposal. Specialist waste requirements (including for water and arisings) should be stated separately.

g) Establishment charges, overhead charges and profit.

Drawn Information

1. Drawn information where required to be provided for the full implementation of this document is defined as follows:

a. Location drawings.

i) Block plan. To identify site and outline of building in relation to Town Plan or other wider context.

ii) Site plan. To locate the position of buildings in relation to setting out point, means of access and general layout of site.

iii) General locating drawing. To show the position occupied by the various spaces in a building and the general construction and location of principal elements.

b. Bill diagram. To be drawn information which may be provided with the bills of quantities to aid the description of the item. Information by way of dimensions or detail may be indicated, alternatively such information shall be included in the relevant description that accompanies the bill diagram.

Quantities

1. Where the unit of billing is the metre, quantities shall be billed to the nearest whole unit, the minimum value being 1. Fractions of a unit less than half shall be disregarded and all other fractions shall be regarded as a whole unit.

2. Where the application of the above clause would cause an entire item to be eliminated, such item shall be enumerated stating the size.

Provisional or Prime Cost Sums

1. Where this document requires provisional or prime cost sums to be given in accordance with this clause, the choice of terms shall be made in accordance with the following definitions.

a. The term "provisional sum" is defined as a sum provided for work or for costs which cannot be entirely foreseen, defined or detailed at the time the tendering documents are issued.

b. The term "prime cost sum" is defined as a sum provided for work or services to be executed by a nominated sub-contractor, a statutory authority or a public undertaking or for materials or goods to be obtained from a nominated supplier. Such sum shall be deemed to be exclusive of any profit required by the general contractor and provision shall be made for the addition thereof.

Difficult Working Conditions

1. Alterations and work in existing buildings shall be so described. Handling materials and getting them in or out of such buildings shall be deemed to be included with the items. Labour on existing work shall be so described.

2. Work carried out in, over or under water shall be so described stating whether canal, river or sea water and (where applicable) the mean spring levels of high and low water.

3. Requirements for disposal of water and arisings including filtration, chemical balancing, obtaining licences, dispensations etc… shall be so stated.

Means of Access, Weather Protection & Hoisting

1. Responsibilities for the provision, erection, maintenance, dismantling and removal of means of access, weather protection and hoisting shall be clearly stated.

SECTION 3: NOTES ON REPAIR MEASUREMENT INCLUDING ILLUSTRATIONS

General Repair and Repairs to Arrises

a) In general, repairs on flat surfaces do not include for the re-creation of an arris the repair shall be measured by area and depth in accordance with Fig. 1.

b) If a repair to a beam, column or slab edge includes one arris and the girth is <400mm it shall be measured in accordance with Fig. 2.

c) If a repair to a beam, column or slab edge includes two arrises and the girth is <800mm it shall be measured in accordance with Figs. 3.1 and 3.2.

d) Repairs to flat surfaces which include an arris and which lie outside the maximum girth of 400mm shall also be measured as two repairs. The arris repair shall be taken as 400mm girth as fig. 2 and the other repair shall be measured as a repair to a flat surface of the remaining area as Fig. 1.

e) A similar approach shall be adopted if the repair covers two arrises and the girth of the repair is >800m. The repair would be measured as three separate repairs; two single arris repairs with a girth of 400mm as Fig 2. with the central flat surface measured as fig. 1.

f) An exception to this is repairs to corners of slabs or balconies and the like. Repairs measured in this category include for the re-creation of three arrises e.g. two horizontal and one vertical meeting as a common point. In this case the area shall be measured as the sum of the areas on the individual faces and recorded as a specific item see Fig 4.

g) Repairs including two corners of a slab or balcony and the like involving five arrises shall be measured as two repairs with the centre line of the slab taken as the dividing line between repairs and recorded as a separate items as fig 5.

h) The depth categories are according to maximum depth of the repair measured perpendicular to the face of the member and taken within a substantial proportion of the repair area. Localised deeper areas which in total do not exceed 10% of the area shall not be taken into account when assessing the repair depth. Accidental overbreak shall not be included when assessing the depth of a repair. For repair to corners of slabs of balconies and the like, as in fig. 4, where repairs span more than one face of a member, the depth (including the specified depth of concrete removal from behind bar) shall be measured on the largest face and this depth used to categorise the repair.

i) Large repairs comprising complex shapes are to be divided in an appropriate manner. Where three or more sides exist, large variations in depths occur or a significant number of small localised repairs (possibly of differing orientation) are deemed to be one complex repair, these shall be measured as individual repairs with the balance also measured as separate items.

FIGURE 1: Illustrations of Repair Measurement

Defect Type Description Diagram

1 Vertical Surface, no arises

Fig 1. Area = Length x Width Depth of repair = maximum depth of the repair within a substantial proportion of the repair area.

2 Soffit Surface As Fig. 1

3 Deck Surface As Fig. 1

4 Two Vertical surfaces, one arris (e.g. column)

Fig 2. Length is longest length measurement Width measurements should be taken on a left to right basis. Where the area of damage includes a soffit this is recorded as width 1. Girth = Width 1 + Width 2 Depth of repair = maximum depth of the repair within a substantial proportion of the repair area.

5 Two Horizontal surfaces one arris including a soffit (e.g. beam or slab edge)

As Fig. 2

6

Three Vertical surfaces, two arrises (e.g. column)

Fig 3.1

Fig. 3.2 When an area of damage has two arises and three planes the central plane width dimension should be recorded as width 1. Remaining width dimensions should be taken on a left to right basis. Girth = Width 1 + Width 2 + Width 3 Depth of repair = maximum depth of the repair within a substantial proportion of the repair area.

7 Three horizontal surfaces, two arises one soffit (e.g. Beam)

As Fig 3.1 & 3.2

8 Slab corner repairs

Fig 4. Repairs on slab extending along two edges, measured as one repair A1

A1

9 Repairs on slab extending along three edges

Fig. 5 Repairs on slab extending along three edges, measured as two repairs – one of area A1, and one of area A2.

SECTION 4: METHOD OF MEASUREMENT

GENERAL, TRIALS AND ROUTINE TESTING

A general description of the work shall be given. All concrete repair works shall be measured in accordance with this Method of Measurement, incorporating the Notes and Illustrations in Section 3. It is recommended that work to the external elevations of high rise buildings be measured and described in the following height bands above ground level.

0 - 12m above ground level 12 - 20m - ditto - 20 - 30m - ditto - 30 - 40m - ditto - etc. - ditto -

Site Accommodation

Items shall be given for providing, erecting, maintaining, dismantling and removing site accommodation.

Means of Access, Weather Protection and Hoisting

Items shall be given for providing, erecting, maintaining, dismantling and removing means of access, weather protection and hoisting.

Temporary Propping

Items shall be given for providing, erecting, maintaining, dismantling and removing temporary propping.

Trial Sample Panels and Repairs

Items shall be given for carrying out trial sample panels and repairs, including for taking test cubes, pull-off tests and any similar tests required to the samples. Sizes shall be stated for the cores to be taken which shall be deemed to be included within the item coverage.

Routine Testing

Items shall be given for taking test cubes and pull-off tests and any similar tests required, during the course of the works. The sizes for any cores to be taken and the frequency of any testing shall be stated. The item coverage is deemed to include any coring, testing, presenting the results and making good the tested area.

1.0.0 SURFACE CLEANING

1.1.0 The required method of surface cleaning shall be stated as follows:

1.1.1 Cleaning by water blasting.

1.1.2 Cleaning by water/steam blasting.

1.1.3 Cleaning by water/abrasive blasting.

1.1.4 Cleaning by open abrasive blasting.

1.1.5 Cleaning by vacuum blasting.

1.1.6 Cleaning by use of hand tools e.g. wire brushing, scraping etc.

1.1.7 Cleaning by use of hand held mechanical tool e.g. needle gun, etc.

1.2.0 The nature of the existing surface shall be stated e.g. bare concrete, concrete coated by a protective coating, concrete partially covered by paint etc.

1.3.0 If the cleaning process is required to remove all surface coatings then this must be stated.

1.4.0 The method of measurement shall be as follows:

1.4.1 Surfaces of concrete walls, columns etc., over 300mm width. (m2)

1.4.2 Surfaces not exceeding 150mm width. (m)

1.4.3 Surfaces over 150mm but not exceeding 300mm width. (m)

1.4.4 Surfaces of concrete ceilings, beams, lintels etc., over 300mm width. (m2)



1.4.7 Surfaces of the top of concrete slabs over 300mm width. (m2)



1.4.10 Isolated surfaces over 300mm width stating the number of surfaces. (m2)

2.0.0 SURVEY

2.1.0 The required method/type of survey shall be stated:

2.1.1 Visual defect survey.

2.1.2 Sounding / delamination survey.

2.1.3 Cover meter survey, for a cover meter surveys the following should also be specified:

a) The frequency at which readings should be recorded in terms of area or linear meters.

b) If single readings are to be recorded or scanning is to take place to determine the highest, mean or lowest cover within a specified area or length of section

c) If cover to primary and secondary steel is to be determined separately within each specified area or length of section.

2.2.0 An item shall be included for the preparation of survey documentation. A detailed description shall be included for the type of survey documentation required:

2.2.1 Marking survey results on drawings provided by the Supervising Officer.

2.2.2 Preparation of full plan/elevation drawings of the existing structures.

2.2.3 Preparation of sketches showing plans/elevations of concrete members and indicating position of defects, repairs, carbonation tests, cover meter survey depths.

2.2.4 Dimensioned sketches of the above.

2.2.5 Preparation of measure defect log.


2.3.1 Surfaces of concrete walls, columns etc., over 300mm width (m2).

2.3.2 Surfaces not exceeding 150mm width (m).

2.3.3 Surfaces over 150mm but not exceeding 300mm width (m).

2.3.4 Surfaces of concrete ceilings, beams, lintels etc., over 300mm width (m2).



2.3.7 Surfaces of the top of concrete slabs over 300mm width (m2).



2.3.10 Isolated surfaces over 300mm width stating the number of surfaces (m2).

2.4.0 Testing should be specified, providing reference to method or code of practice to be followed. The location of each test(s) and access requirement should also be specified if suitable access is not afforded.

2.4.1 Carbonation depth testing, stating element & location (No).

2.4.2 Single increment dust sampling for chloride content (No).

2.4.3 Multiple increment dust sampling, stating no. of increments and depth of each sample increment (No).

2.4.4 Drilling to obtain core samples stating diameter, depth and orientation (No).

2.4.5 Half-cell potential readings, stating grid spacing, area, orientation, element and method of reporting (No).

2.4.6 Resistivity measurement (No).

2.4.7 Taking photographs (Item).

2.4.8 Preparation of survey document, stating factual or interpretive (Item).

2.4.9 Physical or chemical testing of recovered samples as specified (Item).

3.0.0 REPAIRS

3.1.0 The method of concrete removal, preparation of the concrete and steelwork and the repair material(s) shall be stated.

3.2.0 Repairs shall be measured in the following categories:

3.2.1 Repairs within areas of walls or column faces.

3.2.2 Repairs within areas of ceilings, or soffits of slabs.

3.2.3 Repairs to sides and soffits of beams and lintels.

3.2.4 Repairs to top surfaces of slabs.

3.2.5 Repairs to arrises of columns.

3.2.6 Repair to the arrises of walls.

3.2.7 Repairs to top and bottom arrises of beams and lintels.

3.2.8 Repairs to top and bottom arrises of slab and balcony edges.

3.2.9 Repairs to corner of slabs and balconies.

3.3.0 Within the above categories 3.2.1, 3.2.2, 3.2.3 and 3.2.4 repairs shall be enumerated stating the surface area in the following stages:

3.3.1 Surface area not exceeding 0.01m2.

3.3.2 Ditto over 0.01 but not exceeding 0.05m2.





3.3.7 Surface areas over 1.00m2 shall be grouped together and stated in m2.

3.4.0 Within the above categories the maximum depth of the repair (to include the specified depth of concrete removed from behind bars) shall be stated as:

3.4.1 Not exceeding 25mm deep.

3.4.2 Over 25mm but not exceeding 50mm deep.





3.4.7 and thereafter in increments of 50mm.

3.5.0 Arris repairs within the above categories 3.2.5, 3.2.6, 3.2.7 and 3.2.8 shall be measured by stating the maximum depth in categories 3.4.1 to 3.4.7 and the maximum girth in the following stages:

3.5.1 0mm - 150mm girth.

3.5.2 150mm - 300mm girth.

3.5.3 300mm - 450mm girth.

3.5.4 Each arris repair is deemed to include the recreation of one arris only. Should a repair span around three faces of a member, a two arris repair shall be measured by stating the

maximum depth in categories 3.4.1 to 3.4.8 and the maximum girth in the following stages:

3.5.5 0mm - 300mm girth.

3.5.6 300mm - 600mm girth.

3.5.7 600mm - 900 girth.

3.5.8 Arris repairs shall be measured in linear metres, except repairs not exceeding 300mm long and repairs 300mm - 600mm long, which will be so described and enumerated.

3.6.0 Corner repairs within the above category 3.2.9 shall be measured by measuring the sum of the repair areas to the faces of the member to be repaired in accordance with Section 3 and surface area categories 3.3.1 to 3.3.7 and using the maximum depth of the repair in accordance with clause 3.4.0 and depth categories 3.4.1 to 3.4.7, depth measured perpendicular from the face with the largest area. Recreation of arrises is deemed included in this method of measuring.

3.6.1 Each corner repair is deemed to include the recreation of three arrises only. Should a repair span around four faces of a member, two sets of measurements shall be made. The mid point of the member shall be taken as the division point between the two repairs.

3.6.2 Each corner repair is deemed to include the associated provision, fixing, working around stated projections and striking of formwork.

3.7.0 Repairs that are to be finished to directly receive the finished coating system must be so described. The type of finish required for the repair is to match the existing/surrounding area. Any deviation from this shall be so stated.

3.7.1 All repairs are deemed to be finished flat unless otherwise stated. Any forming of sloping surfaces should be described including details of any specific angle of slope required.

3.7.2 All repairs are measured net of any deductions. No deductions shall be made for reinforcement, steel sections < 0.5m², cast in accessories or individual voids < 0.05m

3.

3.7.3 Cutting out of steel reinforcing bars shall be measured by number. The size and type of bar, the length of the piece to be cut shall be stated.

3.7.4 Replacement of steel reinforcing bars shall be measured by number stating the size, type, bending requirements and length of new bar and the method of connecting to the existing reinforcement.

3.7.5 Protective coatings to new steel reinforcing bars shall be stated.

4.0.0 CRACK REPAIRS

4.1.0 The method of concrete removal, preparation of the concrete and the repair material(s) shall be stated.

4.1.1 The final width and depth of the crack repair required, after cutting out, shall be stated in mm.

4.2.0 Crack repair shall be measured within the following categories:

4.2.1 In surfaces of concrete walls, columns etc.

4.2.2 In surfaces of concrete ceilings, beams, lintels etc.

4.2.3 In surfaces of the top of concrete slabs etc.

4.3.0 The unit of measurement shall be as follows:

4.3.1 Cracks not exceeding 150mm long (No).

4.3.2 Cracks over 150mm but not exceeding 300mm long (No).




4.3.6 Cracks exceeding 0.75m length (m).

5.0.0 PORE / BLOW HOLE FILLERS

5.1.0 The nature of the repair material shall be stated together with a detailed description of the finish required to the existing surface being treated. Any requirement to remove or work around existing services shall be so stated.


5.2.1 Surfaces of walls, columns etc.

5.2.2 Surfaces of ceilings, sides and soffits of beams and lintels etc.

5.2.3 Surfaces of top of slabs etc.

5.3.0 Within these categories the items shall be measured as follows:

5.3.1 Surfaces over 300mm wide (m2).

5.3.2 Isolated surfaces over 300mm wide stating the number of surfaces (m2).

5.3.3 Surfaces not exceeding 150m wide (m).

5.3.4 Surfaces over 150mm but not exceeding 300mm wide (m).

6.0.0 LEVELLING MORTARS / FAIRING COATS

6.1.0 The nature of the levelling/fairing material shall be stated together with a detailed description of the surface finish required.

6.1.1 The nature of the substrate of the surface being levelled shall be stated.

6.1.2 Any requirement to remove, overcoat or work around existing services shall be so stated.

6.1.3 The required finished thickness of the material shall be considered as an average unless stated as either maximum or minimum.

6.1.4 Dubbing out coats in preparatory work to extra depths shall be so described stating average thickness.


6.2.1 Surfaces of walls, columns etc.

6.2.2 Surfaces of ceilings, sides and soffits of beams and lintels etc.

6.2.3 Surfaces of top of slabs etc.

6.3.0 Within these categories the items shall be measured as follows:

6.3.1 Surfaces over 300mm wide (m2).

6.3.2 Isolated surfaces over 300mm wide stating the number of surfaces (m2).

6.3.3 Surfaces not exceeding 150mm wide (m).

6.3.4 Surfaces over 150mm but not exceeding 300mm wide (m).

6.4.0 The following labour items shall be measured separately.

6.4.1 External arrises (m).

6.4.2 Finishing up to projecting obstructions not exceeding 500mm width (No).

6.4.3 Ditto over 500mm width (m).

6.4.4 Working around, removal and reinstatement of services (No).

7.0.0 SURFACE COATINGS AND TREATMENTS

7.1.0 The nature of the coating material shall be stated.

7.1.1 The nature of the surface being coated shall be stated.

7.1.2 The required number of coats or the required coating thickness shall be stated in microns.

7.1.3 Any requirement to remove, overcoat or work around existing services shall be so stated.


7.2.1 Surfaces of walls, columns etc., over 300mm width (m2).



7.2.4 Surfaces of ceilings, beams, lintels etc., over 300mm width (m2).



7.2.7 Surfaces of top of slabs etc., over 300mm width (m2).



7.3.0 Isolated surface areas not exceeding 1.00m2 shall be given in m2 stating the number of surfaces (m2).

8.0.0 RESIN INJECTION

8.1.0 The method of cutting out and preparation of the crack shall be stated.

8.1.1 The type of resin injection, together with mixing proportions and any restrictions on rate of injection shall be stated.

8.2.0 The method of measurement shall be by labour and materials.

8.2.1 Provision shall be made in the Bill of Quantities for the tenderer to price a provisional number of labour and plant hours.

8.2.2 Provision shall be made for a provisional amount of injected materials and shall be measured in kgs or litres of material used.

SECTION 5: SPECIMEN BILL OF QUANTITIES GENERAL

Rate Amount

Item Description Quantity Unit £ £

A GENERAL DESCRIPTION OF WORKS TO BE UNDERTAKEN including any special restrictions or limitations to such as working hours to the occupied buildings, phasing of operations, anticipated start date, protection, noise limits, access, hoisting and the like

SITE ACCOMMODATION

B Provide and erect site accommodation Item

C Maintain site accommodation Week

D Dismantle and remove site accommodation Item

E Disposal of waste arising from the repair works.

Item

F Disposal of waste water from concrete removal including filtration to remove fines and chemical balancing to achieve a PH value between 7 and 9.

Item

ACCESS, WEATHER PROTECTION AND

HOISTING

E Provide and erect access, weather protection and hoisting

Item

F Maintain access, weather protection and hoisting

Week

G Dismantle and remove access, weather protection and hoisting

Item

TEMPORARY PROPPING

H Provide and erect temporary propping Item

J Maintain temporary propping Week

K Dismantle and remove temporary propping Item

Carried to collection

USER NOTES

TRIALS AND ROUTINE TESTING

Rate Amount


TRIALS

A Trial sample panels No

B Making and testing sets of three cubes for trial sample panels

No

C Pull-off tests in trial sample panels No

ROUTINE TESTING

D Making and testing sets of three cubes during the course of the works to be tested at 7, 14 and 28 days.

No

E Pull-off tests during the course of the works using 50mm diameter dollies in up to 5% of the repairs.

No


USER NOTES

SURFACE CLEANING

Rate Amount


LOCATION Z1

WALLS, COLUMNS etc.

A width exceeding 300mm m²

B width not exceeding 150mm m

C width over 150mm not exceeding 300mm m

CEILINGS, BEAMS etc.

D width exceeding 300mm m²

E width not exceeding 150mm m

F width over 150mm not exceeding 300mm m

TOP OF SLABS etc.

G width exceeding 300mm m²

H width not exceeding 150mm m

J width over 150mm not exceeding 300mm m

K isolated surfaces of walls (In No. ) m²

L isolated surfaces of ceilings (In No. ) m²

M isolated surfaces of tops of slabs (In No. ) m²


USER NOTES

SURVEY

Rate Amount


LOCATION Z1

DEFECT SURVEY



C width over 150mm but not exceeding 300mm

m

D special feature No

SOUNDING / DELAMINATION SURVEY

E width exceeding 300mm m²

F width not exceeding 150mm m

G width over 150mm but not exceeding 300mm

m

COVERMETER SURVEY (specify method)

H width exceeding 300mm m²

J width not exceeding 150mm m

K width over 150mm but not exceeding 300mm

m

L carbonation depth tests No

M taking concrete dust samples No

N taking incremental dust samples No

P testing concrete dust samples for chloride content

No

Q taking concrete core samples diameter x deep

No

R Other testing as necessary…. No

S taking photographs Item

T preparation of survey documentation Item


USER NOTES

REPAIRS TO REINFORCED CONCRETE

Rate Amount


LOCATION Z1

WALL OR COLUMN FACES

Depth not exceeding 25mm

A area not exceeding 0.01m² No

B area exceeding 0.01m² but not 0.05m² No

C area exceeding 0.05m² but not 0.10m² No

D area exceeding 0.10m² but not 0.25m² No

E area exceeding 0.25m² but not 0.50m² No

F area exceeding 0.50m² but not 1.00m² No

G area exceeding 1.00m² m²

Depth exceeding 25mm but not 50mm

H area not exceeding 0.01m² No

J area exceeding 0.01m² but not 0.05m² No

K area exceeding 0.05m² but not 0.10m² No

L area exceeding 0.10m² but not 0.25m² No

M area exceeding 0.25m² but not 0.50m² No

N area exceeding 0.50m² but not 1.00m² No

P area exceeding 1.00m² m²

etc.


USER NOTES


Rate Amount


LOCATION Z1

WITHIN AREAS OF CEILINGS OR SOFFITS OF SLABS Depth not exceeding 25mm
















etc.


USER NOTES


Rate Amount


LOCATION Z1

SIDES & SOFFITS OF BEAMS & LINTELS

















etc.


USER NOTES


Rate Amount


LOCATION Z1

TOP SURFACES OF SLABS

















etc.


USER NOTES


Rate Amount


LOCATION Z1

SINGLE ARRIS OF WALLS AND COLUMNS


Girth 0 to 150mm

A length not exceeding 300mm No

B length exceeding 300mm but not 600mm

No

C length exceeding 600mm m


Girth 150 to 300mm

D length not exceeding 300mm No

E length exceeding 300mm but not 600mm

No

F length exceeding 600mm m


Girth 300 to 600mm

G length not exceeding 300mm No

H length exceeding 300mm but not 600mm

No

J length exceeding 600mm m


Girth 0 to 150mm

K length not exceeding 300mm No

L length exceeding 300mm but not 600mm

No

M length exceeding 600mm m

etc.


USER NOTES


Rate Amount


LOCATION Z1

SINGLE ARRIS OF BEAMS AND LINTELS


Girth 0 to 150mm



No



Girth 150 to 300mm



No



Girth 300 to 600mm



No



Girth 0 to 150mm



No


etc.


USER NOTES


Rate Amount Item Description Quantity Unit £ £


Girth 0 to 300mm



No



Girth 300 to 600mm



No



Girth 600 to 900mm



No



Girth 0 to 300mm



No



USER NOTES


Rate Amount


LOCATION Z1

TWO ARRIS REPAIR OF BEAMS AND LINTELS


Girth 0 to 300mm



No



Girth 300 to 600mm



No



Girth 600 to 900mm



No



Girth 0 to 300mm



No



USER NOTES


Rate Amount


LOCATION Z1

CORNERS OF SLABS OR BALCONIES











I area exceeding 0.01m² but not 0.05m² No





area exceeding 1.00m² m²

Note: Should a repair span around four faces of a member, two sets of measurements shall be made (3.6.1 & Fig 5.)

etc.


USER NOTES

CRACK REPAIRS

Rate Amount


LOCATION Z1

IN SURFACES OF WALLS, COLUMNS, ETC.

After preparation width not exceeding 5mm, depth not exceeding 10mm

A crack length 0 to 150mm No

B crack length 150mm to 300mm No

C

D

E

crack length 300mm to 450mm


crack length 600 to 750mm

No

No

No

F crack length exceeding 0.75m m

After preparation, width 10mm, depth 20mm

G crack length 0 to 150mm No

H crack length 150mm to 300mm No

J

K

L



crack length 600 to 750mm

No

No

No

M crack length exceeding 0.75 m

etc


USER NOTES

PORE/BLOW HOLE FILLERS

Rate Amount


LOCATION Z1

WALLS, COLUMNS etc.








TOP OF SLABS etc.






M isolated surfaces of top of slabs (In No. ) m²


USER NOTES

LEVELLING MORTARS / FAIRING COATS

Rate Amount


LOCATION Z1

Finished Thickness 2mm

WALLS, COLUMNS etc.








TOP OF SLABS etc.







N external arrises m

P finishing up to projecting obstructions not exceeding 500m width

No

Q ditto over 500mm width m


USER NOTES

SURFACE COATINGS AND TREATMENTS

Rate Amount


LOCATION Z1

WALLS, COLUMNS etc.




CEILINGS, BEAMS




TOP OF SLABS, etc.








USER NOTES

Concrete Repair Association Kingsley House, Ganders Business Park,Kingsley, Bordon, Hampshire GU35 9LU Tel: +44 (0)1420 471615 www.cra.org.uk A Company Limited by Guarantee Registered in England No 3119958 VAT registration No 468 9258 85

standard method of measurement for concrete...

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