轻质泡沫混凝土泡沫剂的性能优选与配比试验研究  

Comparison Tests on the Performance of Foam Agents and Mixture Proportion Tests of Light Weight Foam Concrete

作　　者：周宇航 罗如平 朱碧堂 李青强 余金 梁启帆 胡扬扬 Zhou Yuhang;Luo Ruping;Zhu Bitang;Li Qingqiang;Yu Jin;Liang Qifan;Hu Yangyang(School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China;Engineering R&D Centre for Underground Technology of Jiangxi Province,East China Jiaotong University,Nanchang 330013,China;Department of Architectural Engineering,Jiangxi Water Resources Institute,Nanchang 330013,China)

机构地区：[1]华东交通大学土木建筑学院,江西南昌330013 [2]华东交通大学江西省地下空间技术开发工程研究中心,江西南昌330013 [3]江西水利职业学院建筑工程系,江西南昌330013

出　　处：《华东交通大学学报》2024年第2期41-47,共7页Journal of East China Jiaotong University

基　　金：国家自然科学基金项目(52208343,52020105003)。

摘　　要：【目的】研究轻质泡沫混凝土泡沫剂及其溶液的优选、最优配比。【方法】通过对几种典型泡沫剂的表面张力、发泡倍率、半衰期以及所产生泡沫的稳定性开展系统性试验研究为方法,提出了优选泡沫剂的性能指标及其浓度值。在此基础上,以C40水泥土配合比为参照,将制备好的泡沫与C40水泥浆液按照不同的注入体积比进行混合,测定其干、湿重度,确定不同设计重度条件下轻质泡沫混凝土配比方案。进一步,分别进行无侧限抗压强度试验测定不同重度条件下轻质泡沫混凝土试块抗压强度值和电镜扫描试验了解其微观结构组成。【结果】试验结果表明:不同类型泡沫剂最优浓度约为3%,发泡倍率为25,表面张力32 mN/m,半衰期为15 min;轻质泡沫混凝土的密度和强度随泡沫注入率的增加显著降低,相应气泡群量含量和气孔大小离散性明显增大。【结论】轻质泡沫混凝土干密度与注入率呈衰减型指数关系,无侧限单轴抗压强度与轻质泡沫混凝土干密度近似呈非平缓递增型指数关系。【Objective】Study on the optimization of foam agent and its solution and the optimal proportion.【Method】Through systematic experimental research on the research methods of surface tension,foaming ratio,half-life and stability of foam produced by several typical foam agents,the performance index and concentration value of foam agent for optimization were proposed.On this basis,with the C40 cement soil mix ratio as a reference,the prepared foam and C40 cement slurry are mixed according to different injection volume ratios,their dry and wet weight are measured,and the proportioning scheme of lightweight foam concrete under different design weight conditions is determined.Further,unconfined compressive strength tests were conducted to determine the compressive strength of lightweight foam concrete test blocks under different gravity conditions,and electron microscope scanning tests were conducted to understand their microstructure.【Result】The results showed that the optimal concentration of different types of foam agents was about 3%,the foaming ratio was 25,the surface tension was 32 mN/m,and the half-life was 15 minutes;The density and strength of lightweight foam concrete decrease significantly with the increase of foam injection rate,and the corresponding bubble group content and pore size dispersion increase significantly.【Conclusion】Dry density of lightweight foam concrete and the injection rate are in an exponential relationship of attenuation type,and the unconfined uniaxial compressive strength and the dry density of lightweight foam concrete are approximately in an exponential relationship of non gentle increase type.

关 键 词：轻质泡沫混凝土 泡沫剂 最优浓度 配比试验 经验公式 微观结构 

分 类 号：TU52[建筑科学—建筑技术科学] U414[交通运输工程—道路与铁道工程]