不同碱含量速凝剂的应用性能影响因素研究

通过测试水泥凝结时间、1d和28d砂浆抗压强度，对比SJ-1（无碱）和SJ-2（有碱）速凝剂在不同的水泥类型、粉煤灰掺量、速凝剂掺量、水胶比影响因素下的应用效果。结果表明，从凝结时间来看，SJ-2型速凝剂对不同类型水泥的适应性更好；随粉煤灰掺量增大，水泥初终凝时间先减后增，各龄期抗压强度降低，且使用SJ-1、SJ-2速凝剂时粉煤灰掺量分别不得大于15%、10%；随速凝剂掺量增大，水泥初终凝时间不断降低，且掺入SJ-2速凝剂的各项性能均满足标准要求；随水胶比增大，水泥凝结时间逐渐增大，各龄期抗压强度先增后减，SJ-1、SJ-2速凝剂的最佳水胶比分别为0.4、0.35。

Study on influencing factors of application performance of accelerator with different alkali content

By testing the cement setting time, 1-day and 28-day compressive strength of mortar, this paper compares the application effects of accelerator SJ-1 (alkali free) and SJ-2 (alkali containing) under different cement types, fly ash contents, accelerator contents and water binder ratios. The results show that SJ-2 has better adaptability to different types of cement in terms of setting time. With the increase of fly ash content, the initial and final setting time of cement decreases first and then increases, and the compressive strength of each age decreases. The fly ash content for SJ-1 and SJ-2 shall not be greater than 15% and 10% respectively. With the increase of accelerator content, the initial and final setting time of cement decreases continuously, and the properties with SJ-2 meet the standard requirements. With the increase of water binder ratio, the setting time of cement gradually increases, and the compressive strength of each age first increases and then decreases. The optimal water binder ratio for SJ-1 and SJ-2 are 0.4 and 0.35 respectively.