Experimental study on the out-of-plane strengthening of unreinforced masonry walls using cement-based fiber composites

Postgraduate Symposium in Civil and Environmental Engineering 2019

生态环境科学;土木建筑工程

Altoubat, Salah^1 ; Maalej, Mohamed^1 ; Leblouba, Moussa^1 ; Saboor Karzad, Abdul^1

Department of Civil and Environmental Engineering, Sustainable Construction Materials and Structural Systems Research Group, University of Sharjah, P.O. Box 27272, Sharjah, United Arab Emirates^1

关键词: Cement-based fiber composite;    Engineered cementitious composite (ECC);    Fiber reinforced shotcrete;    Out-of-plane displacement;    Precast reinforced concrete;    Strength and ductilities;    Strengthening methods;    Un-reinforced masonry walls;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/601/1/012028/pdf
DOI  :  10.1088/1757-899X/601/1/012028

来源: IOP

【 摘 要 】

This paper presents results from an ongoing research that is intended to study the behavior of URM walls for out-of-plane action. The effect of fiber reinforced shotcrete (FRS) as a strengthening method for the URM walls is examined. Eight URM walls were built inside a precast reinforced concrete boundary frame and strengthened with cement-based shotcrete mixes reinforced with different types of fibers. The masonry wall is 1.2x 1.2 m, and the masonry units were hollow concrete blocks (10 x 20 x 40 cm). Conventional fiber reinforced concrete (FRC) and engineered cementitious composite (ECC) were used as the strengthening layers sprayed on the surface of masonry walls. Control walls with plain shotcrete and conventional plastering mortar were also examined. Synthetic macro-fibers at dosage rate of 6 kg/m3 in FRC mix and Polyethylene micro-fibers at a dosage rate of 16 kg/m3 in ECC mix were considered in this study. The walls were placed in a carefully designed set up and tested under static central load using a hydraulic actuator with a capacity of 500 kN. The parameters recorded during testing were the applied load and out-of-plane displacement of the walls. Cracking pattern and failure modes were also monitored. The reported test results demonstrate that FRC and ECC mixes can significantly increase the out of plane strength and ductility of the URM walls.