用硬化水泥石配料的硅酸盐水泥熟料烧成特性与力学性能

Calcination Characteristics and Performance of Portland Cement Clinker with Hardened Cement Paste

为探究硬化水泥石部分替代水泥生料对熟料烧成的影响,研究了硬化水泥石在高温(1000~1450℃)下的煅烧特性,进而研究了相同率值下不同硬化水泥石掺量(0、10%、20%和30%)与不同煅烧温度(1350、1400℃和1450℃)对水泥生料的易烧性与熟料性能的影响规律。结果表明:硬化水泥石经过高温煅烧后,在1300℃时会再次生成C_(3)S。硬化水泥石替代部分硅酸盐水泥生料会降低液相出现的温度与C_(3)S的表观活化能,其最佳掺量为20%。硬化水泥石的掺入会稳定C_(2)S的晶型导致C_(3)S形成困难,同时使C_(3)S的晶型由R型向M型转变。与分析纯原料作为水泥生料相比,适量硬化水泥石(20%)作为水泥生料掺入会提高熟料后期的力学性能,这可能与熟料中C_(3)S晶型差异、C_(2)S活性差异以及熟料矿相的发育质量有关。

To investigate the influence of hardened cement paste on the calcination and properties of Portland clinker,the calcination characteristics of hardened cement paste at 1000-1450℃were investigated.The effects of hardened cement paste content(i.e.,0%,10%,20%,and 30%)and calcination temperature(i.e.,1350,1400℃and 1450℃)on the sintering and properties of Portland cement clinker at the same target values were also studied.The results show that C_(3)S phase is formed again after the calcination of hardened cement paste at 1300℃.For a partial replacement of raw cement material with harden cement paste,the temperature of a liquid phase appears and the apparent activation energy decreases.Its optimal dosage is 20%.The raw cement material with a higher content of harden cement paste can stabilize the crystal formation of C_(2)S,resulting in a difficulty of C_(3)S formation.Also,the crystal formation of C_(3)S changes from R form to M form.The incorporation of an appropriate amount of hardened cement paste(i.e.,20%)improves the mechanical properties of clinker in later stage,which may be related to the difference in C_(3)S crystal form,C_(2)S activity and the development quality of cement clinker.