石灰石粉对高铝水泥性能的影响

Effect of Ground Limestone on Performance of High Alumina Cement

研究了石灰石粉对高铝水泥胶砂试件强度及孔结构的影响,分析了石灰石粉在高铝水泥水化过程中的作用.结果表明:高铝水泥胶砂试件抗折强度和抗压强度均随石灰石粉掺量(质量分数,下同)的增加呈现先升高后降低的趋势,各龄期(1,3,7,28d)胶砂试件的抗折强度与抗压强度均在石灰石粉掺量为3%时达到最大值;适量石灰石粉掺入高铝水泥中可生成单碳型水化碳铝酸钙和氢氧化铝,提高胶砂试件的密实度和强度;高铝水泥胶砂试件28d总孔隙率、大孔孔隙率和小孔孔隙率均随石灰石粉掺量的增加呈现先减小后增大的趋势,当石灰石粉掺量为3%时,胶砂试件各孔隙率均最小.

Effect of ground limestone on the strength and pore structure of high alumina cement mortar specimens was studied,and the role of ground limestone in the hydration process of high alumina cement was analyzed.The results show that the flexural and compressive strength of high alumina cement mortar specimens increase first and decrease later with increasing ground limestone use level（by mass）.When the ground limestone use level is 3%,the flexural and compressive strength of the specimens at 1,3,7,28 d reach the maximum.The formation of hydrated calcium monocarboaluminate and aluminum hydroxide improves the density and strength of the specimens when ground limestone substitutes a proper part of high alumina cement.The total porosity,macroporous porosity,small hole porosity of high alumina cement mortar specimens for 28 d decrease first and increase later with increasing ground limestone use level. When the ground limestone use level is 3%,The total porosity,macroporous porosity,small hole porosity of the specimen for 28 d reach the minimum.