率值对含磷硅酸盐水泥熟料矿物组成和微观结构的影响

Effects of modulus on mineral composition and microstructures of phosphorus-containing Portland cement clinker

采用含磷石灰石部分替代石灰石,制备P_(2)O_(5)含量(质量分数)为1.5%和2.5%的两种含磷硅酸盐水泥熟料,通过游离CaO(f-CaO)含量测定、X线衍射分析、岩相观测和力学性能测试,研究含磷石灰石配料对硅酸盐水泥熟料矿物组成和结构的影响。结果表明:利用含磷石灰石制备硅酸盐水泥熟料时,由于P_(2)O_(5)作为酸性氧化物会使实际石灰饱和系数(KH)和硅率(SM)降低,从而导致水泥熟料中C_(3)S含量减少;通过提高KH,保持适中的SM,可增加硅酸盐水泥熟料中C_(3)S含量,改善水泥熟料的强度。采用KH、SM和IM分别为0.96、2.10和1.50的率值配制生料,制备P_(2)O_(5)含量为1.5%和2.5%的水泥熟料,f-CaO含量分别为0.42%和1.05%,而C 3S含量分别为49.8%和39.6%。

Phosphorus-containing limestone was used to partially replace normal limestone to prepare two kinds of Portland cement clinkers.The content of phosphorus in clinker was calculated as P_(2)O_(5),and the phosphorus content of the clinker was 1.5%and 2.5%,respectively.Free CaO(f-CaO)content,X-ray diffraction analysis,microstructure and mechanical performance tests were studied to analyze the effects of phosphorus-containing limestone on the mineral composition and microstructures of Portland cement clinker.Results showed that the acid oxide of P_(2)O_(5) leaded to the decrease of actual lime saturation coefficient(KH)and silicon modulus(SM),causing the decrease of C 3S content in cement clinker.Quality of the cement clinker could be improved with the increasing of KH and maintaining of a moderate SM,since the C_(3)S content in the Portland cement clinkers was increased.When the phosphorus content was 1.5% and 2.5%,the f-CaO content was 0.42%and 0.55%,and the C_(3)S content could reach 49.8%and 39.6%,if KH,SM and IM for cement clinkers were set as 0.96,2.10 and 1.50,respectively.