Time- and temperature-dependence of compressive and tensile behaviors of polypropylene fiber-reinforced cemented paste backfill  

作　　者：Iarley Loan Sampaio LIBOS Liang CUI 

机构地区：[1]Department of Civil Engineering,Lakehead University,Ontario,P7B 5E1,Canada

出　　处：《Frontiers of Structural and Civil Engineering》2021年第4期1025-1037,共13页结构与土木工程前沿（英文版）

基　　金：The authors would like to thank the Natural Sciences and Engineering Research Council of Canada(NSERC)for the financial support of this research.

摘　　要：The understanding of compressive and tensile behaviors of polypropylene fiber-reinforced cemented paste backfill(FR-CPB)play crucial roles in the successful implementation of reinforcement technique in underground mine backfilling operations.However,very limited studies have been performed to gain insight into the evolution of compressive and tensile behaviors and associated mechanical properties of FR-CPB under various curing temperatures from early to advanced ages.Thus,this study aims to investigate the time(7,28,and 90 d)-and temperature(20°C,35°C,and 45°C)-dependence of constitutive behavior and mechanical properties of FR-CPB.The obtained results show that pre-and post-failure behaviors of FR-CPB demonstrate strongly curing temperature-dependence from early to advanced ages.Moreover,the pseudo-hardening behavior is sensitive to curing temperature,especially at early ages.Furthermore,the mechanical properties including elastic modulus,material stiffness,strengths,brittleness,cohesion,and internal friction angle of FR-CPB show increasing trends with curing temperature as curing time elapses.Additionally,a predictive model is developed to capture the strong correlation between compressive and tensile strength of FR-CPB.The findings of this study will contribute to the successful implementation of FR-CPB technology.

关 键 词：cemented paste backfill fiber reinforcement constitutive behavior temperature TAILINGS 

分 类 号：TU52[建筑科学—建筑技术科学]