再生微粉固化黄土状盐渍土的力学特性和微观机理  

Mechanical properties and microscopic mechanism of loess-like saline soil solidified by regenerated micronized powder

作　　者：李舒洁 常立君[1] LI Shujie;CHANG Lijun(School of Civil Engineering,Qinghai University,Xining 810016,China)

机构地区：[1]青海大学土木工程学院,青海西宁810016

出　　处：《中国粉体技术》2022年第5期30-39,共10页China Powder Science and Technology

基　　金：青海省自然科学基金项目:编号:2017-ZJ-791;岩土力学与堤坝工程教育部重点实验室开放基金项目:编号:2019005。

摘　　要：以再生微粉作为固化剂,采用干掺和湿掺2种不同的掺入方法对青海省海东市的黄土状盐渍土进行固化,通过无侧限抗压强度试验、SEM和XRD测试探究固化盐渍土的力学特性和微观机理。结果表明:再生微粉的掺入使黄土状盐渍土的抗压强度较天然盐渍土的有明显提升,且湿掺法对固化土的强度影响更为明显;再生微粉掺入后生成的水化硅酸钙、水化铝酸钙具有胶结作用,与再生微粉共同填充在土颗粒的孔隙中,使土体密实度和固化土强度增大。The loess-like saline soil in Haidong City, Qinghai Province was cured by using the regenerated micropowder as the curing agent, and methods of dry blending and wet blending. Mechanical properties and microscopic mechanisms of cured saline soils were investigated by unconfined compressive strength test, SEM and XRD. The results show that the compressive strength of loess-like saline soil is significantly improved by the addition of regenerated fine powder compared with that of natural saline soil, and the wet blending method has a more obvious effect on the strength of the solidified soil. The cemented hydrated calcium silicate and hydrated calcium aluminate are filled in the pores of the soil particles together with the regenerated micropowder, which improves the soil compactness and the strength of the solidified soil.

关 键 词：再生微粉 盐渍土 固化 力学特性 抗压强度 

分 类 号：TU448[建筑科学—岩土工程]