磨细钡渣对普通硅酸盐水泥水化历程的影响

Effect of tiny barium slag on hydration process of Portland cement

测定不同磨细钡渣掺量下水泥-钡渣体系的抗折强度、抗压强度和水化热,结合X射线衍射(XRD)和扫描电子显微镜(SEM)技术,分析磨细钡渣掺量对普通硅酸盐水泥水化历程的影响规律,探讨磨细钡渣资源化利用的技术方案。结果表明:随钡渣掺量的增加,水泥-钡渣浆体强度逐渐下降水化放热推迟,水化温峰消弱;由于稀释作用,钡渣抑制普通硅酸盐水泥1 d水化产物中钙矾石(AFt)和氢氧化钙(CH)的形成;钡渣中引入的大量可溶性SO2-4,使7 d水化产物中出AFt及石膏增加,当掺量质量分数达50%时,出现大量结晶较好的石膏晶体;磨细钡渣不具备较好的一次水化活性,可作为混合材应用于水泥工业。

The hydration heat,flexural strength and compressive strength of cement-barium slag systems with different barium slag amounts are tested,the influence of different amounts of tiny barium slag on the hydration process of Portland cement is analyzed by XRD and SEM,and the technology program about the resource utilization of tiny barium slag is discussed. The result shows that,with increasing the amount of barium slag,the strength of cement-barium slag paste decreases,the heat of hydration is delayed,and the heat peak of hydration weakens;Barium slag inhibits the forming of AFt and CH which are 1d hydration products of Portland cement due to the dilution effect,at the same time barium slag brings many soluble SO2-4,which makes AFt and gypsum in 7 d hydration products increase;When the amount of barium slag reaches to 50%,there exist a lot of gypsum crystals;Tiny barium slag does not have a good first hydration activity,but can be used as an admixture in cement industry.