Abstract: In order to improve the freezing damage of the concrete structure at the expansion joint of the bridge, this paper designed and prepared a super toughness cement-based composite material (PP-ECC) with polypropylene fiber and studied the antifreeze performance. The mixing process was carried out, and the quality loss of the specimen was used as the evaluation index. The frost resistance of the material under freeze-thaw cycle conditions was analyzed. Based on the indexes of compression resistance, flexural strength and tensile strength, the mechanical pro-perties of the composites subjected to different freeze-thaw cycles were studied, and the time-expansion analysis of the volume expansion deformation of PP-ECC was carried out.The results show that with the increase of the number of freeze-thaw cycles, the mechanical strength shows a downward trend, and the quality loss of the test piece gradually increases. The freezing and thawing volume expansion strain also shows a re-gular variation of the time course with the alternate lifting of the freezing and thawing temperature. In addition, the maximum expansion strain increases significantly with the increase of the number of freeze-thaw cycles. Finally, by comparing the ordinary concrete of the existing research li-terature, the basic performance indexes of PP-ECC materials after the same number of freeze-thaw cycles can be analyzed, including mass loss rate, compressive strength, ultimate tensile strength, ultimate tensile strain, and resistance. The folding strength and the anti-freeze-thaw volume expansion deformation performance can still maintain a high level, the ultimate tensile strain is about 120—400 times that of ordinary concrete, has significant tensile toughness, and the mass loss rate after 300 freeze-thaw cycles. Below 5%, the research results can provide a theoretical reference for the promotion of PP-ECC seamless expansion of bridge expansion joints in the cold regions of China.
靳贺松, 李福海, 何肖云峰, 王江山, 胡丁涵, 胡志明. 聚丙烯纤维水泥基复合材料的抗冻性能研究[J]. 材料导报, 2020, 34(8): 8071-8076.
JIN Hesong, LI Fuhai, HE Xiaoyunfeng, WANG Jiangshan, HU Dinghan, HU Zhiming. Research on Frost Resistance of Polypropylene Fiber Cement-based Composite Material. Materials Reports, 2020, 34(8): 8071-8076.
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