钢渣重构组成设计的关键因子

Key factor of composition design of steel slag reconstruction

钢渣重构设计缺乏普适的控制参数,研究发现在CaO掺量充足的条件下,重构钢渣的最终矿物组成为C_3S、C_4AF、C_2F、MgO。基于此,提出钢渣重构组成设计的关键因子KHs。采用KHs对2种钢渣进行重构,利用X射线衍射、扫描电子显微镜研究了重构钢渣的矿物组成,采用水泥胶砂强度试验法测定重构钢渣的活性指数。结果表明:理论矿物C4AF被实际产生的Ca2(Al1-pFep)_2O_5取代,P值在0.64~0.7之间,典型组成是Ca_2Al0.67Fe1.33O_5,据此修正了KHs;当KHs≤0.67时,重构钢渣中C_3S尚未形成;0.67<KHs<1时,重构钢渣主要理论矿物组成包括C_2F、C_6AF_2、C_2S和C_3S四种矿物;KHs≥1时,重构钢渣C_2S理论上全部转化为C3S。KHs为0.91~1.13时,重构钢渣活性指数最低为85%,最高为94%;采用KHs进行钢渣重构组成设计时,可将硅酸率(SM)作为辅助参数。

The universal control parameters of composition design for steel slag reconstruction were lacked. It was discovered that the final mineral composition of reconstructed steel slag contained C3S, C4AF, C2F, MgO. Based on these findings, the key factor （KHs） of steel slag＇s composition design for reconstruction was presented. Two kinds of steel slag were reconstructed by means of KHs theory, the mineral composition of the reconstructed steel slag was determined by XRD and SEM, the activity index was determined by cement mortar strength testing method. The results demonstrated that C4AF was substituted by Ca2 （Al1-pFep）2O5, P＇Ys values was between 0.64 to 0.7, the typical composition was Ca2Al0.67Fe1.33O5, KHs was amended according to these results. When KHs ≤0.67, C3S was not formed. When 0.67 〈KHs〈1, the mineral composition of reconstructed steel slag contained C2F, C6AF2, C2S, C3S. When KHs ≥ 1, C2S completely converted to C3S in theory. When KHs was between 0.9 to 1.13, and the activity index of reconstructed steel slag was fluctuant from 85% to 94.2%, The Silicic acid rate （SM） could be used as an auxiliary parameter when steel slag was reconstructed by KHs.