Flexural toughness of hybrid fiber reinforced shotcrete
Xia Dongtao, Zhang Zhouqiang, ZhangYanfang and Zhu Yuting
DOI:10.11835/j.issn.1674-4764.2015.02.011
Received September 17, 2014,Revised , Accepted , Available online June 25, 2015
Volume ,2015,Pages 67-72
- Abstract
The flexural toughness of hybrid fiber reinforced shotcrete was studied with hybrid fiber including different contents of steel fiber，polypropylene fiber and blast furnace powder super composite were used to reinforce in cemetition matrix. 600 mm×600 mm×100 mm hybrid fiber reinforced shotcrete panels were adopted and placed on the rigid support frame and the equal displacement was used to control the load on the center of panels. The load-deflection curves and the energy absorption value were used to comprehensively evaluate the flexural toughness of each group，and by analyzing the process of the panels failure the ability of the panels to limit the cracks could be assessed. The results showed that,the jet panels with 0.8% steel fiber and 0.11% polypropylene fiber showed better flexural toughness than the jet panels with 1.2% steel fiber and 0.11% polypropylene fiber，and the peak load increased by 18% and the energy absorption increased by 25.6% when the the deflection was 25 mm.When jet panels with 0.8% steel fiber mixed with 0.11% polypropylene fiber，the energy absorption increased by 28.5% because of the positive synergy effect of steel and polypropylene fiber. The flexural toughness of hybrid fiber reinforced shotcrete panels were reinforced and toughed with more blast furnace powder. All of the hybrid fiber reinforced shotcrete panels showed great ability to limit the cracks，and the whole of panels where the cracks appeared but not ran through presented ductile failure.