Tensile strength behavior of cement-stabilized dredged sediment reinforced by polypropylene fiber  

作　　者：Lei LANG Jiangshan LI Xin CHEN Lijun HAN Ping WANG 

机构地区：[1]State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanic,Chinese Academy of Sciences,Wuhan 430071,China [2]Hubei Provincial Key Laboratory of Contaminated Sludge and Soil Science and Engineering,Wuhan 430071,China [3]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Frontiers of Structural and Civil Engineering》2024年第3期380-392,共13页结构与土木工程前沿（英文版）

基　　金：This study is supported by the National Key R&D Program of China(No.2020YFC1908703);China Postdoctoral Science Foundation(No.2022M723347).

摘　　要：This study evaluated the feasibility of using polypropylene fiber(PF)as reinforcement in improving tensile strength behavior of cement-stabilized dredged sediment(CDS).The effects of cement content,water content,PF content and length on the tensile strength and stress–strain behavioral evolutions were evaluated by conducting splitting tensile strength tests.Furthermore,the micro-mechanisms characterizing the tensile strength behavior inside PF-reinforced CDS(CPFDS)were clarified via analyzing macro failure and microstructure images.The results indicate that the highest tensile strengths of 7,28,60,and 90 d CPFDS were reached at PF contents of 0.6%,1.0%,1.0%,and 1.0%,exhibiting values 5.96%,65.16%,34.10%,and 35.83%higher than those of CDS,respectively.Short,3 mm,PF of showed the best reinforcement efficiency.The CPFDS exhibited obvious tensile strain-hardening characteristic,and also had better ductility than CDS.The mix factor(C_(C)^(a)/C_(w)^(b))and time parameter(q_(t0)(t))of CDS,and the reinforcement index(k_(t-PF))of CPFDS were used to establish the tensile strength prediction models of CDS and CPFDS,considering multiple factors.The PF“bridge effect”and associated cementation-reinforcement coupling actions inside CPFDS were mainly responsible for tensile strength behavior improvement.The key findings contribute to the use of CPFDS as recycled engineering soils.

关 键 词：dredged sediment chemical stabilization fiber reinforcement splitting tensile strength micro-mechanisms 

分 类 号：TQ172.1[化学工程—水泥工业] TB383.1[化学工程—硅酸盐工业]