文献类型：期刊文献

英文题名：Enhancement effect of calcium carbide residue and rice husk ash on soft soil: Small-strain property and micro mechanism

作者：Li, Na[1];Pang, Yingdi[1];Wang, Wei[1,2];Wu, Erlu[1];Fan, Meixin[1];Jiang, Ping[1];Mei, Guoxiong[3]

机构：[1]Shaoxing Univ, Shaoxing Key Lab Interact Soft Soil Fdn & Bldg Str, Sch Civil Engn, Shaoxing 312000, Peoples R China;[2]Shaoxing Univ, Inst Artificial Intelligence, Shaoxing 312000, Zhejiang, Peoples R China;[3]Zhejiang Univ, Ocean Coll, Zhoushan 316021, Zhejiang, Peoples R China

年份：2024

卷号：32

起止页码：774

外文期刊名：JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T

收录：SCI-EXPANDED(收录号：WOS:001285082200001)、、EI(收录号：20243116799054)、Scopus(收录号：2-s2.0-85199981081)、WOS

基金：This research was funded by National Natural Science Foundation of China (Grant number 52179107) .

语种：英文

外文关键词：Rice husk ash; Calcium carbide residue; Small strain; Dynamic properties; Dynamic shear modulus

外文摘要：The resource utilization of calcium carbide residue (CCR) and rice husk ash (RHA) is helpful to save resources and alleviate environmental pollution. In this research, CCR and RHA were used to modify soft clay, and the resonant column test was conducted to explore its small-strain dynamic characteristics. The micro-mechanism of CCR-RHA modified soft clay (CRSC) was investigated by using scanning electron microscopy, X-ray diffraction and mercury intrusion tests. The findings demonstrated that the dynamic shear modulus of the CRSC increased with the increase of RHA content and confining pressure, but decreased with the increase of shear strain. In contrast, the damping ratio presents the opposite change law. The Hardin-Drnevich (H-D) model was used to fit the dynamic shear modulus/maximum dynamic shear modulus (G/Gmax)-shear strain gamma and the damping ratio Dshear strain gamma. As confining pressure increased, Gmax increased but Dmax dropped in CRSC specimens with the same RHA content. The changes of the fitted G/Gmax-gamma curve could be divided into progressively decrease stage and rapid decrease stage, while the changes of the fitted D-gamma curve could be separated into linear stage and slow stage, with the same turning point gamma = 10-4. Microscopic tests revealed that the incorporation of CCR and RHA helped to promote the hydration reaction, and the generated hydration products such as calcium silicate hydrate were able to enhance the integrity and compactness of the CRSC. The results of this research putfward solid foundation for the application of CCR-RHA in the modification of soft soil.