文献类型：期刊文献

英文题名：Study on Triaxial Mechanical Properties and Micro Mechanism of Fly Ash Reinforced Cement Calcareous Sand

作者：Li, Ben[1];Li, Na[1];Fang, Chulei[1];Hu, Jun[2];Yu, Rong[3];Shu, Longxin[1];Yao, Kai[3];Zhang, Fang[1]

机构：[1]Shaoxing Univ, Sch Civil Engn, Shaoxing 312000, Peoples R China;[2]Hainan Univ, Coll Civil Engn & Architecture, Haikou 570228, Peoples R China;[3]Shandong Univ, Sch Qilu Transportat, Jinan 250002, Peoples R China

年份：2022

卷号：10

期号：6

起止页码：1693

外文期刊名：JOURNAL OF RENEWABLE MATERIALS

收录：SCI-EXPANDED(收录号：WOS:000750818900014)、、EI(收录号：20220811690885)、Scopus(收录号：2-s2.0-85124875946)、WOS

基金：This research was funded by the National Natural Science Foundation of China (41772311, 51968019).

语种：英文

外文关键词：Calcareous sand; cement; fly ash; triaxial UU test; SEM test

外文摘要：In order to study the mechanical properties and micro-mechanism of industrial waste fly ash-reinforced cement calcareous sand (FCS), the triaxial unconsolidated undrained (UU) test and scanning electron microscope tests (SEM) were carried out on it. The results of UU test show that the peak stress and energy dissipation of the FCS sample first increase and then decrease with the increase in fly ash content. Fly ash enhances the cement calcareous sand by increasing both the cohesion and internal friction angle, and adding 10% content of fly ash gives the largest values. The SEM test results shows that the hydration products of cement and fly ash filled the pores and cracks on the surface of the calcareous sand, which increased the compactness and structure of the FCS samples. The porosity of cement calcareous sand can be reduced from 27.6% to 12.8% by adding 10% fly ash. A brittleness evaluation index based on energy dissipation is proposed to quantitatively characterize the brittleness of FCS samples. The results show that when the content of fly ash is 5%, the brittleness of FCS samples is the lowest. This study shows that the mechanical properties of cement calcareous sand can be effectively enhanced by adding the appropriate amount of fly ash.