DOI: 10.5176/2301-394X_ACE18.197
Authors: Ruizhen Yan, Hongxiu Du and Yaoyao Xu
Abstract:
The mechanical and thermal expansion properties of Reactive Powder Concrete (RPC) with different dosage of steel fibers were investigated after exposure to different elevated temperatures. Changes in coefficient of linear expansion of RPC were also detected and analyzed at temperature ranging from 20°C to 800°C. Mixtures were prepared with water to binder ratio of 0.2 and steel fibers content of 0, 1, 2, and 3kg/m3. The results showed that the compressive strength and flexural strength of all the RPC specimens decreased with the increasing temperatures, the addition of steel fibers was effective to the improvement in flexural and compressive strength of RPC. Coefficient of linear expansion of RPC increased at temperature range of 20～630°C, then declined above 630°C, in which, the expansion value of RPC with 1% steel fibers was higher than that of RPC without fibers while the values of RPC with 2% and 3% fibers were lower than that of reference RPC. The flexural to compressive strength ratio results indicated that the incorporation of appropriate steel fiber content was beneficial for the improvement of crack resistance and fire explosive spalling of RPC.
Keywords: reactive powder concrete; steel fiber; flexural strength; compressive strength; coefficient of linear expansion
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