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Deng Z.,Beijing University of Technology | Liu G.,Shanghai Royang Innovative Material Technologies Co. | Du C.,Beijing University of Technology | Shi H.,Shanghai Royang Innovative Material Technologies Co.
Jianzhu Cailiao Xuebao/Journal of Building Materials | Year: 2014

Based on the standard of ASTM C1550, test of circular plate was for the first time introduced in China to examine the effect of a new kind of macro-polyolefin fiber on the flexural toughness of fiber reinforced concrete plate. Compared with the flexural toughness test of beams, it is shown that the test of circular plates is more suitable to evaluate the flexural toughness of macro-synthetic fiber reinforced concrete. The energy absorbtion value increases with increase in fiber length and volume. Applying the evaluation system of Japan JSCE-SF4, for the same fiber quantity 6, 8, 11kg/m3, the flexural toughness index of polyolefin fiber reinforced concrete was increased by 101%, 68%, 76% higher than that of mid-elastic modular fiber respectively and 65%, 90%, 138% higher than that of 15.6kg/m3 steel fiber.


Deng Z.,Beijing University of Technology | Qu J.,Beijing University of Technology | Liu G.,Shanghai Royang Innovative Material Technologies Co. | Shi H.,Shanghai Royang Innovative Material Technologies Co.
Jianzhu Cailiao Xuebao/Journal of Building Materials | Year: 2015

In order to examine the toughness of concrete circular plates reinforced with a new type of macro-polyolefin fiber, a circular plate test was performed and the effects of fiber use level, fiber length and the matrix strength on the flexural toughness, energy absorption value were investigated. The test results show that the absorption energy value is proportional to fiber use level; when fiber length is between 38 to 60mm, the absorption energy value increases with increasing fiber length. When the fiber length is greater than or equal to 48mm, in the descending stages on the load-deflection curve strain hardening behavior appears with two peak loads. The problems with evaluating the flexural toughness using ASTM C1550 were analyzed based on the energy ratio method, and a new toughness evaluating method was proposed. This new method, taking the first-crack deflection as the initial reference deflection, can be used to characterize the contribution of macro-polyolefin fiber to the flexural toughness after initial crack, and can directly used to compare the toughness index with perfect elastoplastic material. ©, 2015, Tongji University. All right reserved.

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