聚羧酸减水剂与缓凝剂复配对快硬复合硫铝酸盐水泥的调凝效果研究

Study on setting adjustment of fast hardening composite sulphoaluminate cement with polycarboxylate superplasticizer and retarder

以聚醚大单体(HPEG)和丙烯酸(AA)为主要原料,通过改变酸醚比和滴加方式,合成一种适用于快硬复合硫铝酸盐水泥(RC·SAC)的聚羧酸减水剂(PCE-1)。研究了PCE-1和市售普通聚羧酸减水剂(PCE-2)分别复配缓凝剂对RC·SAC分散性能、凝结时间和砂浆强度的影响。结果表明,PCE-1和PCE-2复配缓凝剂硼砂(B),随着B掺量的增加,RC·SAC的初、终凝时间逐渐延长,RC·SAC的抗压和抗折强度逐渐降低;PCE-1和PCE-2分别复配B抑制了RC·SAC前期的水化过程,对RC·SAC的水化产物种类没有影响,且PCE-1与B复配时RC·SAC的水化速率更快。

A polycarboxylic acid water reducer(PCE-1)suitable for rapid hardening composite sulphoaluminate cement(RC·SAC)was synthesized from polyether macromonomer(HPEG)and acrylic acid(AA)by changing the acid ether ratio and dropping mode of AA.The effects of PCE-1 and commercially available polycarboxylate water reducing agent(PCE-2)compounded with re-tarders on the dispersion performance,setting time,and mortar strength of RC·SAC were studied.The results show that PCE-1 and PCE-2 mixed with borax(B),the initial and final setting time of RC·SAC gradually increasese and the compressive and flexural strength of RC·SAC gradually decreases with the increase of B content.The combination of PCE-1 and PCE-2 with B inhibits the early hydration process of RC·SAC,has no effect on the types of hydration products of RC·SAC,and the hydration rate of RC·SAC of PCE-1 is faster.