Silica Sand Powder Mixed with Slag Powder Complex Technology Used for PHC Piles Production

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Design concrete mix used in the PHC pile production, silica sand powder and slag powder as a concrete admixture, replace a certain percentage of Portland cement, under the premise of meeting the PHC pile production requirements. After the steam curing, determinate the demould strength of concrete and after autoclave curing, determinatie the compressive strength of concrete. Test results show that it is feasible for the use of silica sand powder and slag powder instead of Portland cement , in which the proportion of concrete admixtures up to 45%. Silica powder and the amount of slag powder were mixed with 150 kg/m3, 50 kg/m3, the concrete demould strength up to 49.1 MPa and the compressive strength after autoclave up to 89.0MPa, to achieve requirements of the national standard GB13476 .