矿物掺合料在活性粉末混凝土(RPC)中应用研究

Application of mineral admixture in active powder concrete(RPC)

矿物掺合料作为一种重要材料在混凝土中应用,为研究矿物掺合料对活性粉末混凝土(RPC)性能影响,以及应用的可行性,将矿物掺合料复配到C120 RPC中,研究对RPC的性能影响规律及得到最佳胶凝材料体系。结果表明:(1)最小基本需水量、标准稠度需水量试验得到矿物掺合料最佳掺量,水泥∶超细矿粉∶硅灰∶粉煤灰=0.7∶0.1∶0.1∶0.1。(2)超细矿粉对RPC 3 d、7 d强度影响明显,分别最大提高6 MPa、13.5 MPa;硅灰对RPC 28 d强度影响明显,最大提高2.2 MPa;粉煤灰对RPC扩展度影响明显,最大提高71 mm。(3)研究确定RPC中四元胶凝体系,即水泥∶超细矿粉∶硅灰∶粉煤灰=0.7∶0.1∶0.1∶0.1,RPC坍落度370 mm,扩展度615 mm,28 d抗压强度128.47 MPa,抗硫酸盐侵蚀等级KS90。

Mineral admixture as an important material in concrete,in order to study the effect of mineral admixture on the performance of active powder concrete(RPC),and the feasibility of application,the mineral admixture into C120 RPC,study the influence of RPC performance and obtain the best gentitious material system.The results show that:(1)The minimum basic water requirement of the optimal mineral admixture,cement∶superfine powder∶silica ash∶fly ash=0.7∶0.1∶0.1∶0.1.(2)Superine powder has significant influence on RPC 3 d and 7 d strength,with maximum increase of 6 MPa,13.5 MPa respectively.Silicon ash has significant influence on RPC 28 d strength,with maximum increase of 2.2 MPa.Fly ash has significant influence on RPC extension,with maximum increase of 71 mm.(3)The study will determine the four-element cementization system in RPC,namely cement∶superfine powder∶silica ash∶fly ash=0.7∶0.1∶0.1∶0.1,RPC slump 370 mm,extension 615 mm,28 d compressive strength 128.47 MPa,sulfate erosion resistance grade KS90.