| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Secondary Peak Load Curve of Polypropylene Crude Fiber Reinforced Lightweight Aggregate Concrete Beam |
| NIU Jiangang1, LIU Jiangsen1, WANG Jialei2
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1 School of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou 014010;
2 School of Civil Engineering, Central South University, Changsha 410083 |
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Abstract In order to study the problem of secondary peak load of polypropylene fiber reinforced concrete beams in the bending deflection curve and the quantitative relationship between fitting flexural strength and fiber content, the lightweight aggregate concrete was mixed with polypropylene fiber, the polypropylene fiber content was 0 kg/m3,3 kg/m3,6 kg/m3 and 9 kg/m3, respectively. Four-point bending beam test was adopted to study the relationship between the fiber content and the lightweight aggregate concrete. By introducing secondary peak load model and by comparing with other literature data, the influential factors of the secondary peak load of the bending load deflection curve were discussed. The results show that when polypropylene fiber content is 6 kg/m3, bending toughness and flexural strength are better. In the fitting quantitative relationship between flexural strength and the fiber content ατ=3.360, compared with the ατ value in the selected literature, the value of ατ which the secondary peak does not appear is smaller, while the value of ατ which the secondary peak load appears is larger. The larger ατ value is related to the secondary peak load of the bending load deflection curve formation. The problem of secondary peak of polypropylene fiber lightweight aggregate reinforced concrete beam in the bending deflection curve can be better explained by secondary peak load model.
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Published: 31 July 2018
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2018, Vol. 32 
