高性能轻质注浆材料制备与微观结构分析

隧道工程长期处于潮湿环境,对壁后注浆材料要求较高。针对隧道工程的特点,采用阴离子表面活性剂改性动物蛋白母液,通过添加醇类稳泡剂,制备新型发泡剂;通过掺入不同极性大分子物质的方式逐步提升母液的起泡及稳泡能力,最终确定最佳配比。研究表明,掺适宜的发泡剂和稳泡剂,可提高泡沫的强度、韧性和黏度,减少沉降和泌水;当起泡组分为0.8%,稳泡组分为0.15%时,发泡剂起泡和稳泡性能最好,所制备的注浆材料结构和性能优良;通过微观结构分析发现水胶比从0.40增大到0.48,泡沫量多,易产生连通孔,孔径均匀性变差,沉降增加。

Preparation and Microstructure Analysis of High Performance Lightweight Grouting Materials

The subway tunnel project is usually in a long-term humid environment, which requires high grouting material behind the wall. It should not only undergo the erosion of mud water, but also have good fluidity and fillability. According to the characteristics of subway engineering, a new type of foaming agent was prepared by using anionic surfactant to modify the mother liquor of animal protein and adding alcohol to stabilize the foaming agent. The foaming ability and bubble stabilization ability of mother liquor were improved successively by being mixed with different polar macromolecular substance. The results show that the appropriate foaming agent and foaming stabilizer can improve the strength, toughness and viscosity of the foam, and reduce the sedimentation and bleeding. When the foaming group is 0.8% and the foaming group is 0.15%, the foaming agent and foaming stabilizer have the best foaming and foaming stabilizer performance, and the prepared grouting material has excellent structure and performance. Micro -structure analysis found that when the water binder ratio increased from 0.40 to 0.48, the amount of foam is large and connected pores are easily generated, which makes the uniformity of the pore size deteriorate and the settlement increases.