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基于河道淤泥气泡混合土微观构造特征的发泡剂适用性研究
李荣贺, 顾欢达
苏州科技大学 土木工程学院, 江苏 苏州 215011
摘要:
[目的] 研究发泡剂种类及气泡生成方式对河道淤泥气泡混合土(FMLSS)的适用性,为环境保护和河道淤泥的资源化利用提供支持。[方法] 从微观和宏观角度对不同FMLSS进行考察,对比微观构造特征的差异性,以及不同微观构造特征对各类河道淤泥气泡混合土物理力学性能的影响。[结果] ①不同类型FMLSS微观构造差异性受气泡掺量影响显著,受水泥掺量影响相对较小。②同等气泡掺量下,双氧水(H型)消泡严重,且制备的FMLSS内部含有少量大气孔且分布不均匀。同等密度下,大气孔含量更多,制成的FMLSS质量较差。③复合类发泡剂F(F型)和阴离子型发泡剂K12A(K型)在料浆中稳定性较好,制成的FMLSS微孔分布均匀性较好,但F型发泡剂成孔尺度较小且分布均匀,表现出良好的强度变形特性。[结论] 先发泡工艺优于后发泡工艺,F型发泡剂在工程制备河道淤泥气泡混合土时适用性较好。
关键词:  河道淤泥  发泡剂  适用性  物理力学特性  微观构造
DOI:10.13961/j.cnki.stbctb.2018.06.022
分类号:
基金项目:国家自然科学基金项目“河道淤泥气泡混合土的力学性质及破坏机理研究”(51378327)
Applicability of Foaming Agent Based on Microstructure Characteristics of Foamed Mixture Lightweight Soil of River Sludge
LI Ronghe, GU Huanda
Department of Civil Engineering, University of Science and Technology of Suzhou, Suzhou, Jiangsu 215011, China
Abstract:
[Objective] The applicability of different types of foaming agents and different bubble preparation methods in the preparation of foamed mixture lightweight soil of sludge(FMLSS) was studied in order to provide reference for environmental protection and utilization of river sludge.[Methods] From the micro and macro perspectives, different channels of silt and bubble mixed soil were investigated. The microscopic characteristics of different mixed soil of river silt and bubble was compared, and the influences of different microstructural characteristics on the physical and mechanical properties of various river silt mixed soil was anayzed.[Results] ① The microstructural differences of different types of river silt and bubble mixed soil were significantly affected by the amount of air bubbles and were less adffected by cement content. ② When the amount of air bubble was constant, the bubble would be burst seriously by hydrogen peroxide(H type), and the prepared soil with mixed river silt and bubble by hydrogen peroxide contained a small amount of big atmospheric pores and the distribution was uneven. Under the same density, the air pore content of H type river silt and bubble mixed soil was more, and the quality of the mud-bubble mixing soil was worse. ③ The distribution of FMLSS micro pores made by compound foaming agent(F type) and anionic foaming agent K12A(K type) were better. But the pore size of F type foaming agent was small and the distribution was uniform and good strength and deformation characteristics were shown.[Conclusion] The first foaming process is better than the later foaming process. The F type foaming agent has better applicability in the preparation of foamed mixture lightweight soil using of river sludge.
Key words:  river sludge  foaming agent  applicability  physical and mechanical properties  microstructure