Everything You Need to Know About Grouting
Sometimes cracks or honeycombs appear in concrete, which can have lethal effects. Gaps could also form between structural joints for other reasons. To fix these matters, you have to use grouts. Today, we will talk about everything you need to know about grouting.
Grout is the process material in cavities or cracks in concrete, masonry structure, soil, rock mass to increase the capacity of load-bearing structure of the injection refers to the grouting and the material used for this purpose It called grout.
A slurry of cement, sand and water or chemical helps fill gaps is called grout. It is used to repair cracks concrete, fill gaps in the tiles, the joints and filling gaps to waterproof seal and for soil stabilization. Grouting also it has done to provide additional strength to the base of load bearing structures.
Grouts are used for different applications such as repairing cracks, filling voids and gaps in tiles, joint sealing for waterproofing structure submerged as tunnels, channels, etc., and to stabilize the soil. Here we are talking about types of grout used for crack repair.
Types of Grout
Based on the material grouts are classified as follows:
1. Chemical Grouting
2. Resin injection
3. Bentonite grout
4. Bituminous grout
Advantages of Grouting
a. Grouting can be done in any terrain condition.
b. It produces no vibration and can be controlled; therefore, there is no possibility of structural damage.
c. It improves soil structure can be measured
d. Suitable for limited space and low-rise application.
e. Very useful for slab jacking levels or raise the deformed base.
f. It can be done adjacent to an existing wall.
g. It helps control the flow of groundwater, filtration and type of hazardous waste material and process.
a. Grouts are available as premixed powder, ensuring high quality mortar.
b. It is presented as a component product only required water and the mixture, and is ready for use.
c. Compensation has owned contraction.
d. There is no problem of segregation and bleeding with grout.
e. It can be poured and pumped as needed.
f. It contains an excellent property flowing.
g. Its consistency can be adjusted.
h. The mix has adequate adhesion to concrete.
i. It has a high rate of force development.
j. An area of very effective support is provided.
k. It is not a toxic and flammable material.
l. It has the noncorrosive properties.
m. It offers initial expansion by generating gas.
a. Grouting in machine foundation, the base plate, bearing and spinal joints in building panel.
b. t is used to fill gaps, holes and cavities in the concrete.
c. Grouting is performed to fill the gaps between the rock face and the infill of the tunnel.
d. It is used for the attachment of tendons post-tensioned prestressed concrete construction.
e. It is used for repair of pavement and soil under the foundations.
f. It is used to repair cracks in concrete and masonry defects.
g. In addition, for fixing anchors to the ground screen concrete piles.
Grouting G1 is mainly used for steel structure, small bombs, ships, towers and all other machinery no vibration. Still, the precise application of the type of grout in any location should be in accordance with the corresponding drawing.
Must be cementitious, non-shrinkable, and free flowing with compressive strength equal to or greater than the concrete foundation, but not less than 30 N / mm2 at 7 days and 40 N / mm2 at 28 days.
This type of grouting is generally used for prefabricated concrete structure, compressor, heavy equipment vibrated and column plates supporting mass structure.
Minimum compression strength of the grouting should be 50 N / mm2 at 7 days and 60 N / mm2 at 28 days. Grout flexible force must exceed 9N / mm2 at 28 days.
Grout cement must be not shrinkable high strength grout example Fosroc Conbextra GP2, MC -Bauchemie Emcekrete and Sikka or similar approved by EIC. The specific location for applying the grout should be followed from the drawing.
The mixture of grout and Tools
Take the required amount of water in a drum, placing grout powder therein, and then mixed. The mixture of grout powder can be done mechanically using an electric drill at low speed (500 rpm max) with water in an appropriate ratio to prevent entraining air. For the property of consistency and desired flow, the mixing ratio can be adjusted.
For Flowable Grouting - Water: Powder = 0.14 to 0.16 by weight (4.2 l to 4.8 liters of water for 30 kg bag).
For pourable Grouting - Water: Powder = 0.12 to 0.14 by weight (3.6 liters to 4.2 liters of water for 30 kg bag).
The mixing time for minimal mixing is 3 minutes.
Prepare the surface by cleaning grouting through a high pressure jet of water, scrabbles, blasting, etc. To ensure a dry saturated condition throughout the process surface, the concrete surface should be pre-soaked with water.
After mixing the grouting was immediately poured into the surface grout. Ensure that the air replaced by the grouting could easily escape; otherwise, entrapped air will prevent full contact grouting.
To maintain a saturated surface dry condition, moisten, especially when grout baseplates porous surface. Maintain a pressure head sufficient to maintain continuous and the grouting flows.
For optimal use of the expansion properties of the product, try to use as quickly as possible (within 15 minutes).
Grout types used for ceramic tiles
a. Un-sanded grout: Suitable for wall tiles with grout joints less than 3.175 mm (1/8 ") wide.
b. Finely grinding grouting: useful tile is gasketed 3.175 to 9.525 mm (1/8" to 3/8") wide.
c. Quarry grouting type: Similar to finely sanded grout for ceramic tiles, but thicker grade sand is used. It is suitable for 9525 to 12.7 mm (3/8" to 1/2") wide joints.
d. Epoxy grout: is made of an epoxy resin and hardener. Epoxy Grout offers high resistance to stains and chemicals and has excellent bond strength. It is an ideal choice for areas susceptible to stains such as countertops and others.
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