粉煤灰对水泥土强度及固化过程的影响  

Effects of fly ash on the strength and solidification process of cement soil

作　　者：陈三姗 陈峰[1,2] CHEN Sanshan;CHEN Feng(Coordinative Innovation Center for Environment-Friendly and Energy-Saving High-Performance Concrete, Fuzhou 350108, China;School of Engineering, Fujian Jiangxia University, Fuzhou 350108, China)

机构地区：[1]福建省环保节能型高性能混凝土协同创新中心,福建福州350108 [2]福建江夏学院工程学院,福建福州350108

出　　处：《福建工程学院学报》2021年第1期61-67,共7页Journal of Fujian University of Technology

基　　金：福建省自然科学基金(2019J01883);福建省教育厅科技项目基金(JAT170611);福建江夏学院青年科研基金(JXZ2016005)。

摘　　要：从粉煤灰-水泥相互作用、粉煤灰-淤泥质土相互作用两个方面开展一系列试验,研究粉煤灰对水泥和淤泥质粘土的强度及固化过程的影响,然后通过扫描电镜(SEM)试验,观察粉煤灰水泥土的微结构变化以探究其机理。粉煤灰水泥石强度试验表明粉煤灰能使水泥石28 d及以上龄期的强度提高,粉煤灰淤泥质土的含水率试验和固结不排水试验表明,粉煤灰使淤泥土的硬度变大,X射线衍射(XRD)试验表明粉煤灰能细化水泥中Ca(OH)_(2)晶粒,SEM试验结果表明粉煤灰可以使水泥土的微结构更加密实。A series of experiments were carried out considering fly ash-cement interaction and fly ash-silty soil interaction to study the effects of fly ash on the strength and solidification process of cement and silty soil.Then the microstructure changes of fly ash cement soil were observed to explore its mechanism through scanning electron microscope(SEM)tests.The strength test of fly ash cement stones shows that the strength of cement stones at 28 d and above were improved by adding fly ash.The moisture content test of fly ash-silty soil and its consolidated undrained test show that the mixed soil became harder.The X-ray diffraction(XRD)test shows that fly ash could refine the Ca(OH)_(2) crystal grains in cement.SEM test results show that the microstructure of cement soil became more compact by adding fly ash.

关 键 词：水泥土 粉煤灰 固化机理 微观分析 强度 

分 类 号：TU477[建筑科学—结构工程]