不同的引气剂对湿拌砂浆化学改性研究

The effect of different air entraining agent on properties of wet-mix mortar chemical property change

湿拌砂浆外加剂胶凝材料对于湿拌砂浆质量的控制至关重要。研究了十二烷基苯磺酸钠(LAS)、三萜皂甙、松香、十二烷基硫酸钠(K12)、α-烯基磺酸钠(AOS)5种引气剂对湿拌砂浆性能的影响。结果表明,掺入引气剂后,湿拌砂浆的初始稠度有了不同程度的增加,其中掺AOS的湿拌砂浆初始稠度增幅最大;引气剂的加入对湿拌砂浆的凝结时间有一定的影响,可以在一定程度上降低湿拌砂浆的稠度经时损失,但是对湿拌砂浆的保水率影响很小;引气剂对湿拌砂浆的强度影响很大,当引气剂的掺量超过0.015%以后,会严重影响湿拌砂浆28 d抗压强度。

Wet mix admixtures are essential for the quality control of wet mix mortar.In this paper,the effects of five air entraining agents,including sodium dodecylbenzene sulfona,tetriterpenoid saponins,rosin,sodium dodecylbenzene sulfate and sodium alpha-olenyl sulfonate,on the performance of wet-mixed mortar were studied.The results showed that the initial consistency of wet-mix mortar increased to different degrees after adding air entrainer,and the initial consistency of wet-mix mortar with AOS increased the most.The addition of air entraining agent had a certain effect on the setting time of wet-mixed mortar,which reduced the loss of consistency of wet-mixed mortar over time to a certain extent,but had little effect on the water retention rate of wet-mixed mortar.The air entraining agent had a great influence on the strength of wet-mixed mortar.When the air entraining agent content exceeded 0.015%,it seriously affected the 28 day compressive strength of wet-mixed mortar.