摘要
为解决水泥固化软土强度低及水泥生产时能耗高、污染大等问题,拟采用矿渣、粉煤灰两种工业固体废弃物制备地质聚合物固化路基软土。通过无侧限抗压强度试验研究矿渣、粉煤灰占比对固化土强度的影响;采用X射线衍射(X-Ray Diffraction,XRD)及扫描电子显微镜(Scanning Electron Microscope,SEM)试验对固化土的物相组成及内部结构进行微观表征。结果表明:地质聚合物固化土具有早强特性,前驱体中矿渣与粉煤灰最优比例为9:1,对应试样28 d的抗压强度为8.2 MPa;矿渣水化产物是固化土强度提高的主要原因,粉煤灰适量替代矿渣后固化土微观结构更为致密,但过量替代后土体松散度增大。
In order to solve the problems of low strength of cement solidified soft soil and high energy consumption and pollution in cement production,two kinds of industrial solid wastes,slag and fly ash,were proposed to prepare geopolymer solidified soft soil.The influence of different slag and fly ash ratios on the strength of solidified soil was studied through unconfined compressive strength tests.X-ray diffraction(XRD)and scanning electron microscope(SEM)experiments were used to microscopically characterize the phase composition and internal structure of solidified soil.The results show that geopolymer solidified soil has early strength characteristics,and the optimal ratio of slag to fly ash in the precursor is 9∶1,corresponding to a compressive strength of 8.2 MPa at 28 days for the sample.The hydration products of slag are the main reason for the increase in strength of solidified soil.After replacing slag with appropriate amount of fly ash,the microstructure of solidified soil becomes denser,but excessive replacement leads to an increase in soil looseness.
作者
龙庆辉
李曙光
章本本
陈英豪
罗正东
LONG Qinghui;LI Shuguang;ZHANG Benben;CHEN Yinghao;LUO Zhengdong(Hunan Yiyang Highway and Bridge Construction Co.Ltd.,Yiyang Hunan 413000,China;College of Civil Engineering,Xiangtan University,Xiangtan Hunan 411105,China)
出处
《铁道建筑》
北大核心
2024年第7期136-142,共7页
Railway Engineering
基金
湖南省自然科学基金(2023JJ50008)。
关键词
路基
前驱体比例
试验研究
软弱土
地质聚合物
力学性能
破坏形态
微观结构
subgrade
precursor proportion
experimental research
soft soil
geopolymer
mechanical property
failure form
microstructure
