concrete cloth (concrete canvas)

Concrete Clothchanging the way you think about concrete

Submitted by :Sandeep Kumar Meena (08515603414)

ABSTRACT

Worldwide there is increasing demand of construction and construction materials, for that concrete is most extensively used material in construction. These days concrete is used for so many purposes in many different adverse conditions. There are many advantages of concrete but there is one drawback is that, it is not flexible, when it is hardened. To overcome this drawback of concrete. A new construction material is in evolution called concrete cloth or concrete canvas.

INTRODUCTIONoConcrete cloth is an upcoming revolution in civil world,

which in turn have a wide range of application in rapid construction, in state of emergency etc. due to its own physical property, mainly, flexibility and easy to use. Among various engineering applications of 3D spacer fabric reinforced cementitious composites; concrete canvas (CC, the concept was first proposed by Brewin and Crawford in 2005) is one of the most promising products.

oConcrete cloth consists of a 3- dimensional fiber matrix containing a specially formulated dry concrete mix. A PVC backing is provided on one surface to make it water proof. The other side of the cloth is aided with a hydrophilic fiber (polyethylene and polypropylene yarns) and thus hydration occurs by drawing water into the mixture.

INTRODUCTIONoCompared to traditional concrete solutions, it is faster,

easier and more cost effective to install and has the additional benefit of reducing the environmental impact of concreting works by up to 95%.Typical installation speeds are up to 10 times faster than conventional concrete solutions.

WHAT IS CONCRETE CLOTH?“Concrete cloth is a flexible, concrete impregnated fabric that hardens when hydrated to form a thin, durable, water proof and fire resistant concrete layer.”

source www.nextbigfuture.com

HISTORY OF CONCRETE CLOTH

oWith intention of finding a new material in practice with a property of flexibility and easy to work. The British engineering company had found the revolutionary material, concrete cloth. This revolutionary new material takes its own place in the history of Civil engineering, took the concrete work in a completely new way.

oThis technology was first found for emergency shelters, application to military world and believed that it may not be commercial construction work. But further research in concrete cloth made incredible changes in the construction field.

MATERIAL PROPERTIES

Strength

Physical properties

TYPICAL STRENGTH CHARACTERISTICS

• The test is based on ASTM C473-07.By the test the 7 day minimum compressive strength is equal to 38 MPa .Compressive

testing

• This tests based on ASTM C-1185. The test is used to determine the ability of material to resist the bending. The 7 day minimum bending stress is equal to 3.3 MPa and 7 day modulus minimum is equal to 180 MPa.

Bending test

TYPICAL STRENGTH CHARACTERISTICS

Abrasion resistance

• ASTM C1353-8 is the standard test method to determine abrasion resistance of the material. CC lost 60% less weight than marble over 1000 cycles.

CBR Puncture resistance

• Test is based on EN ISO 12236:2007. The test is used for CC8& CC13. The minimum push-through force is equal to 2.69 kN and the maximum deflection at peak is 38 mm.

TYPICAL PHYSICAL PROPERTIES• Setting time : The time between the end of mixing and

initial set of a material made with a hydraulic binder or the hydraulic binder itself. The initial setting time should be greater than or equal to 120 minutes and the final setting time is greater than or equal to 240 minutes. Concrete canvas will achieve 70-80% strength in 24 hours after hydration.•Density : The dry density of Concrete Cloth before hydration

is 1500 kg/cc Upon Complete hydration the density increases 30-35% to a range of about 1950-2025 kg/cc.

TYPICAL PHYSICAL PROPERTIES

• Thickness : Concrete Canvas is available in 3-thicknesses; CC5, CC8 & CC13, which are 5,8 & 13 mm thick respectively. There is theoretically no limit to the thickness of the fabric, although it will generally be limited by the manufacturing techniques used to produce it. A typical thickness would be between 2 and 15mm.

MARKET AVAILABILITYoConcrete cloth available in two standard roll size :Bulk roll :1.6T weightSupplied on 6 inch cardboard tube

MARKET AVAILABILITY Portable batched roll :Supplied on 3 inch cardboard tube

MARKET AVAILABILITYCC Type Thickne

ss (mm)Roll Width (mm)

Dry Weight (kg/sqm)

Batched roll length (m)

Batched roll coverage(sqm)

Bulk roll length (m)

Bulk roll coverage(sqm)

CC5 5 1000 7.0 10 10 200.0 200

CC8 8 1100 12.0 4.5 5 113.6 125

CC13 13 1100 19.0 N/A N/A 72.7 80

METHOD OF HYDRATIONoConcrete cloth can be hydrated using saline or non-saline

water.oThe minimum ratio of water to Concrete Cloth is 1:2 by

weight. o It cannot be over hydrated so an excess is recommended.o The recommended methods of hydration are : Spraying Immersion

METHOD OF HYDRATION• Spray the dry concrete cloth with water

until it is saturated.• Do not use a direct jet of pressurized

water as this may wash a channel in the material and create a weakened area.

Spraying• concrete cloth immered in water for a

minimum of 90 second.Immersion

ADVANTAGES OF CONCRETE CLOTHRapid : The material can be hydrated by either spraying

it or fully immersing it in water.Easy to use : Dry concrete cloth can be cut using

simple hand tools such as utility knives.Flexible : Concrete cloth can be easily nailed through

before setting.Environment Friendly

ADVANTAGES OF CONCRETE CLOTHStrong : The fiber reinforcement acts to prevent

cracking, absorb energy from impact and provides a stable failure mode.

Fireproof : Concrete cloth is a ceramic based material and will not burn.

Durable : Concrete cloth is chemically resistant and will not degrade in ultraviolet light.

APPLICATION OF CONCRETE CLOTH

Ditch Lining

Concrete cloth can be rapidly unrolled to form ditch lining.

It is quicker and less expensive to install than conventional concrete ditch lining.


Slope Protection

Concrete cloth can be used as slope stabilization.

Concrete cloth can also used as erosion control application.


Pipeline Protection

Concrete cloth can be used as a coating for overland or underground protection,

providing a superior tough rock shield.

In remote areas it can be used to coat steel pipe on site without expensive wet concrete.


Reinforcing Sandbags

“January 2008 a notable amount of concrete cloths are laid in the frontline in Afghanistan to analyse the field usage and the performance which is satisfactory for U.K. army, as a reward the manufacturer got a huge order of concrete cloths of 5500 sq.m to the frontline of Afghanistan by U.K. ministry of defence”


Dust suppression system in helipad


Mining Application Bund Lining

LIMITATION OF CONCRETE CLOTHS

Concrete cloth be over hydrated and an excess of water is always recommended.

Do not jet high pressure water directly onto the concrete cloth as this may wash a channel in the material.

Concrete cloth has a working time of 1-2 hours after hydration so do not move concrete cloth once it has begun to set.

If concrete cloth is not fully saturated, the set may be delayed and strength reduced.

CONCLUSION“ Concrete cloth is a unique proprietary material. It is a time and material saving technique. It is very easy to place and handle. Concrete cloth allows concrete construction without need for plant or mixing equipment. Concrete cloth design life is 10 years. It is specially used where workmanship is very difficult.”

REFERENCES www.concretecanvas.co.uk www.concreteinternational.com www.buildingproduct.co.uk

http://www.concretecanvas.co.uk/

http://www.concreteinternational.com/

THANK YOU

concrete cloth (concrete canvas)

Engineering