Properties of green ultra-high performance concrete containing polyaluminum chloride waste residue
The green ultra-high performance concrete(UHPC)was prepared by grinding the waste residue of polyaluminum chloride(PAC)to replace some cement.The influence of PAC waste residue powder on the working performance,mechanical proper-ties,chloride ion penetration resistance,and drying shrinkage performance of UHPC was studied,and the micro mechanism was ana-lyzed.The results show that as the amount of PAC waste powder replacing cement increases,the expansion of UHPC increases;The addition of PAC waste slag powder is not conducive to the early strength of UHPC,and the compressive strength at 28 days first increases and then decreases with the increase of PAC waste slag powder replacing cement.When the replacement amount of PAC waste slag powder is 150kg/m3,the compressive strength at 28 days is the highest,which is 10.2％higher than that of the reference group;As the amount of PAC waste slag powder replacing cement increases,the resistance to chloride ion penetration and drying shrinkage performance of UHPC first increase and then decrease.When the amount of PAC waste slag powder replacing is 150 kg/m3,the resistance to chloride ion penetration and drying shrinkage performance is the best.
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