Several raw materials of concrete block

the sand as the brick raw materials, often using mountain sand, river sand, aeolian sand also available artificial sand crushed or industrial waste sand,no matter what kind of sand, shall meet The following requirements. Coarse particle size uniform sand or ultra-fine sand particle size less than 0.75mm.

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quicklime, quicklime quality directly affects the the bricks quality, it is better to select high in calcium concentrate,good digestion , high temperature digestion of quicklime, their specific requirements are as follows: CaO content gt; 60%; MgO lt; 5%; the digestion rate lt; 15min; digestion temperature gt; 60 ° C; burned lime lt; 5%; the quicklime lt; 10% pulverized ash lt; 10%.

Cement: ordinary portland cement mixed with 10% of the 425 #, can improve the strength and water resistance of the brick, after immersion in water does not crack. Otherwise, brick cracking phenomenon.

admixtures: mixed with a small amount of admixture (booster dose), addition to brick induration strength, but also to reduce the amount of cement Reversing drum concrete mixer, reduce product cost

water: water consumption appropriate, high strength brick. Forming less water, the strength of the brick poor, the material in the mold resistance, single-sided pressure dense brick underside; molding water content, wet underside, out of the mold easily break something. When the sand with a moisture content of 3-5%, molding the amount of water is preferably 10%. If the raw materials of fine sand is too much Electric portable concrete mixer, then dropped to 8%. Pastes selection of raw materials is very important, strong and beautiful brick can thus produced.