successful brick paver projects…..€¦ · remove snow with rotary brooms when possible. . plows...
TRANSCRIPT
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Successful brick paver projects…..
How to minimize construction
problems
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The Brick Industry Association is a registered provider with the American Institute Of Architects continuing education system. Credit earned on completion of this program will be reported to CES records for AIA members. Certificates of Completion are available on request. This program is registered with the AIA/CES for continuing professional education. As such it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or manner of handling, using, distributing or dealing in any material or product. Questions related to specific materials, methods and services will be addressed at the conclusion of this presentation. This program also qualifies for ASLA/CES one credit hour.
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This program explores proper materials and techniques required for successful segmental brick paver projects. Common and reoccurring construction and design issues are discussed. Topics such as settlement, edge restraints, interlock, protection of completed work, efflorescence, color variation, contractor qualifications and attributes of brick pavers are included in the presentation
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LEARNING OBJECTIVES Success of pavement systems depend on proper drainage, a sound base and subbase, containment of the system, proper design and qualified installers. . Learn common areas where system failure occurs and why it occurs and how to minimize these problem areas . Become familiar with aggregates required for successful projects . Learn how to specify and identify qualified contractors . Learn the attributes of brick pavers
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Program applies primarily to sand and bituminous set pavers. Permeable Installations may have different techniques and materials.
contents
>pavement settlement
>bases….subbases…compaction
>edge restraints
>paver joints…interlock
>aggregates
>protection of work
>sample panels & mock-ups
>efflorescence
>color variation
>design concerns
>contractor qualifications
>attributes of brick
>resources
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>Aggregate base/subbase ….”the base/subase is the backbone of this system. Any deficiency in the base and/or subbase will be reflected in the finished surface.” >Improper Compaction and or materials compact subgrade to 95% standard proctor density – soils with a CBR <3 will need to be replaced with additional subbase or have geotextiles installed compact base/subbase to 98% density in lifts of 3-6”, using a 10 ton roller for large areas and a 13,000 lbf compacter in smaller installations >Loss of bedding sand….improper edge restraints ..loss through weep holes in concrete bases ..loss through voids in curb joints
pavement settlement……..common causes
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PAVEMENT SETTLEMENT
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Pay special attention to areas where settlement usually occurs: -corners of buildings and against -curbs -walls -utility structures -tree pits
Density tests need to be done
on all jobs.
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Aggregates are frequently adjusted slightly to conform
To state DOT standard mixes
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Typical minimum Aggregate
Base/subbase Thickness
Residential sidewalks …4-6 inches Residential driveways… 6-12 in. Public walks/plazas….8-16 in. Heavy vehicular …Consult an Engineer **colder climates & weak soils
require thicker assemblies
Concrete bases
Minimum 4 inches thick with weep holes at low points ( 1-2 inch diameter ), filled with clean stone, covered with a geotextile square
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Weep holes in concrete base
>1-2” diameter
>fill with clean stone
>cover with geotextile square- use construction
adhesive
>for large plazas flood/wet area - install
weep holes at “birdbath”/ponding areas
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edge restraints …. Contain the pavers and bed
Material. Improper edge restraints will allow bed material
to “migrate” which will result in horizontal paver movement
And settlement
PVC or aluminum edge restraints
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Edge spiked into base
Base extends beyond edging
8-12 inches
Toweled mortar edge not
Recommended for cold climates
Angle iron with expansion bolt
Into concrete base is typical
Photo by Pave Tech
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Permeable pavers can be very effective in reducing
storm water run off and providing water to street
trees in an urban environment.
Value engineering?
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paver joints…..there must be a 1/16 – 3/16 inch
Sand filled joint between paver units for system
Interlock and prevention of paver chipping
The phrase “hand tight joints” should not be used
and does not mean no joint
1/8” spacer & beveled unit
No sand filled / tight joints can lead
To chipping. For vehicular installations
…no cut piece less than 1/3 full unit
…herring bone pattern recommended
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No sand filled joint result is chipped pavers
Loss of joint sand results in
Movement and chipping
..tires can pull joint sand
out resulting in movement
and chipping. Consider
polymeric sand for joints.
Effective if done correctly.
Joint loss- movement- granite cobble
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Interlock is the inability of a paver to move independently
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types of interlock…
Horizontal vertical rotational
Primary causes of Paver movement
base/subbase settlement
Bedding Sand loss / migration
> Joint sand loss
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Incorrect vehicular pattern
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Incorrect pattern
Correct patterns
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Protection of completed work
Damage from milling machine
Very poor edge..concrete header curb
Steel plates to protect
Completed work
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Protection from construction traffic
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Oil Stains Always do small test areas when using any
cleaning or sealing material.
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Bedding material ASTM C 33 ..DO NOT USE STONE Dust!!!
Nor masons sand (astm c 144)
Bituminous bedding material
7% liquid asphalt
93% fine aggregate all passing
The #4 sieve
mixed at asphalt “batch” plant
Usually 1-5 tons delivered to
Site at > 300 degrees
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Screed bedding sand
1 ” thick
Pre-compaction of assembly
Do not compact sand bed
Screed bituminous hot mixture
¾ - 1” max. pre-rolling
Bed is compacted/rolled before
Pavers set
Tack coat on concrete base
Neo-asphalt “adhesive” applied
To bed before pavers set
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Protect paver surface
Smaller compactor 4-5000 lbf
13,000 lbf for base
Vs.
neoasphalt “adhesive” applied
with squeegee or trowel…
Thinner is better
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Chalk lines on neo-asphalt adhesive after it dries
(cloudy black in color)
ICPI Tech Spec 20
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Bituminous set pavers can and should be rolled
Or compacted to achieve full bond with the setting
Bed, reduce lippage and improve overall flatness
Of the surface. (BIA TN14B pg.11, BIA Heavy vehicular
Guide pg.36)
Protect pavers, use rubber roller, 4-500lbf plate
Tamper with protective mat. Plywood can also be
Used and is preferred to sand which may damage
Paver surface.
Photo by Pave Tech
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Roller attachment for plate
tamper. Protects pavers
from metal to brick
contact.
Compaction of bituminous set concrete
Pavers ICPI TS 20
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Trucks and buses damage pavement much more that cars. *** one truck or bus
applies the same load and damage as 15,000 cars***
Loaded tractor trailer 3.35 ESALS…….a car .0002 ESALS (2 ten thousandths)
ICPI Tech Spec 4 & 19
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efflorescence / “rock salt stain”
Brick pavers are not the source of efflorescence
NBRC tests conclude correlation between soluble salts in
Aggregates and efflorescence displayed on brick pavers
Typical sources are:
>base and bed material
>concrete bases, curbs, cip concrete walks
>mortar used in wall construction
>building wall cleaning solutions
>fertilizers
>irrigation water
>deicing material …especially rock salt (calcium chloride)
note: Magnesium chloride causes less efflorescence
Soluble salts + water (moisture) = efflorescence
Usually will disappear over time when source is removed
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Salts that cause efflorescence are not found in brick
Pavers in high enough concentrations to cause efflorescence
These salts are found in cement products
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color variation…. blending of pavers from at
Least 3 pallets is recommended
…color within a given production run will vary
slightly
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Mock-ups & sample panels ..
approved mock-ups will be the standard by
which appearance, workmanship, substrate
and material application will be judged.
Sample panels will show the color range and
size variation of the product
Field/sample panel
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Approved Mock-ups may be part of completed work
The standard of expected workmanship
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Laying pattern modules
Adjusting for size variation
Laying based on largest
size paver…brick specifications
Include permissible size
variation, due to raw materials
And heat variation in kiln.
Adjusting for size variation is
An installation issue
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Allowable size variation..astm c902 & c1272
c902…material specification for pedestrian and light vehicular
C1272. material specification for heavy vehicular paving brick
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require string
And chalk lines
To keep bond
Lines straight
>work from center out
>lines every 2 to 6 feet
>grid lines best
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construction tolerances……hold the installer to high standards but there are acceptable/normal construction tolerances and if you have a very good, quality
Installer listen to their suggestions but get documentation
Icpi chart
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ICPI details
>joints 1/16 – 3/16” sand filled >lippage 1/8”
>flatness + - 3/8” per 10 feet >do not use wet or frozen materials
>blend from at least 3 pallets unless factory blended
>straight and true paver bond lines shall not deviate more than + - ½”
at the end of 50 feet
>Vehicular aspect ratio L divided by thickness 3:1 Max. Sand/bitum set
8 divided by 2.75 = 2.91 (rotational stability)
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design concerns …..
Vehicular .. herringbone pattern is recommended
running bond may be used for light
vehicular applications (perpendicular to
the curb) .. 4x8 x 2 ¾” force of stopping and
turning
Poor drainage ..
Proper edge restraints
Examine your documents .. Frequently the
details and specifications do not agree as to product size
and product requirements
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Poor drainage may result in efflorescence , system
Failure due to saturation and icy pavement liability
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Retaining wall needed to keep soil and mulch
Off permeable pavement
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environmental….do not allow installation:
> during rain or snowfall
>over frozen base
>using frozen materials
>on frozen or saturated sand
>>do not allow the use of stone dust/ screenings unless
it is granite meeting ASTM C33
>comply with osha cutting regulations
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Saw with vacuum
correct
Dry cutting is against OSHA regulations and a health hazard.
Correct cutting of brick and concrete
Dry-cutting
incorrect
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contractor qualifications…
Add contractor qualifications to specifications
> 5 years experience with at least 75-100,000 SF
installed
>5-10 similar projects documented
>experience installing clay/brick pavers
minimum 50,000 sf, successful & documented
>completed installer certificate courses
>has included all the specified material in their bid
>Has read and understands ASTM C-902 and C-1272
material specifications & standards for brick
pavers
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Require preconstruction meetings covering scope,
aggregates, edge restraints, compaction, environmental
restrictions, specified products and timely ordering
of material,* ordering material for entire job*,
mock ups, expected workmanship
include a knowledgeable distributor or a manufacturer’s
Representative
Contractors see change orders as an opportunity to increase
profits…..
make sure every one is clear on what is expected
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You want
This not this
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this Not this
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Winter Maintenance . Remove snow with rotary brooms when possible.
. Plows should have rubber edges and rollers to be elevated
above the pavement.
. Snow blowers should have roller skids and rubber paddles
and elevated above the pavement.
..Metal contact with pavers will cause chips and scratches.
.Deicing salts will not harm the paver structurally but may
contribute to efflorescence.
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attributes of brick/clay pavers
>colorfast
>superior freeze/thaw resistance
>immune to structural damage by deicing products….salts
may contribute to efflorescence
>typically have a higher compressive strength than
other traditional paving products
>>ada compliant….joint width and coefficient of friction
>100% pre-consumer recycled product available
>many shades qualify for heat island effect credit for high
sri values
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>qualify for many leed and asla sustainable site
credits
>brick is “green”.. produced from shale and clay, fired
to +-2000 degrees
>brick has a long useful life
There are many projects in Washington, dc, baltimore,
Philadelphia, boston and other cities with brick
Pavers in place for over 80 – 100+ years.
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University of Pittsburgh
wheelchair vibration Pathmet
tests..brick pavers pathway measurement tool
performed as well or testing pavements for
better than cast-in- smoothness/roughness
place concrete establish ASTM standard
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Port Imperial, NJ
New City, NY
4x8” pavers
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Univ. Tenn Visiting Nurses Assoc., NJ
4x8 & 8x8
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Cobbled 6x9 Cobbled 4x8
Midwest Residence PA Residence
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Maryland Project Water Jet Cut Design
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Boardwalk 3x9x3 Essex County Courthouse, Newark, NJ
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Boardwalk 3x9x3 Cherokee, NC
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Emory Univ. The Barns..Gladstone, NJ Boardwalk
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Germanna College, VA
Mont Tremblant
Boardwalk Pavers
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Bethesda Terrace…Central Park, NYC
Patio..NJ
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Oak Park, ILL Cobbled Boardwalk
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Indiana Univ. Stadium
Patec Stadium Rochester, NY
Georgia Tech Univ.
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Youngstown State Univ. Permeable 4x8 Wright State Univ.
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Georgia Tech 4x8 permeable Univ. Dayton
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4x8 permeable
Maryland Residence Miami Conservancy District
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Hawthorne Park Permeable Boardwalk 2 ¼ x 9 x 3”
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Sidwell Friendship School
Texas Installation
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resources...bia tech notes and guides
Tech note
14a sand set
14b bituminous
14c mortar set
14d permeable
14e accessibility/
ada
Heavy vehicular
univ. pittsburgh….evaluation of sidewalk surfaces
wheelchair vibration studies
Icpi
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QUESTIONS?