bricks

Free Web Hosting Provider - Web Hosting - E-commerce - High Speed Internet - Free Web Page

FLYASH-BRICKS

    The process of manufacturing fly ash bricks is based on the reaction of lime with silica of flyash to form calcium silcate hydrates(C-S-H)which binds the ingredients to form a brick.The quality of bricks obtained are highly dependant on the quality of flyash.The manufacturing of Lime-Flyash bricks are generally designed such that they stand at par with burnt clay bricks used conventionally.Fly ash bricks has good compressive strength ,low water absorption,high density and low shrinkage value as compared to burnt clay bricks.
        Raw materials:        Raw materials required for manufacturing of bricks are Flyash, lime gypsum and sand(optional)
       Flyash:(usage 60 -75 %) Apart from conforming to IS Requirement the minimum requirement for manufacturing of fly ash bricks are :
         Loss of Ignition --- should be not more than 12%
        Availability of MgO ------should be not more than 5%
        Availability of SiO₂ ------should be not more than 35%
        Availability of Al₂O₃------should be not more than 15%
            LIME:(usage 8 -15 %) Lime is very important ingredient usede for manufacturing of bricks ,hence it should satisfy following minimum requirement:

Lime ,while slaking process should not attain less than 60^{0 Celsius
temperature and slaking time should not be more than 15 minutes .}
^{Availability
of CaO should be minimum 60%}
^{MgO
content should be maximum of 5%.}

GYPSUM:(usage 2 - 5%)It is added to the mix in order to accelerate hardening process and acquiring the early strength.It should have minimum 35% of purity.
SAND:(usage 0 - 8 %)Addition of sand is optional,but to enhance the gradation of the mix ,addition of coarse sand is quite preferable.Addition of sand also enhances the resitivity of mix to formation of laminar cracks caused due to entrapped air.

Manufacturing: The manufacturing process s of bricks broadly consists of three operations viz. mixing the ingredients ,pressing the mix in machine and curing the bricks for stipulated period.

BACK TO UTILIZATION

HOMEPAGE