冻融循环作用下聚丙烯纤维混凝土的力学性能

发布时间：2018-02-15 01:49

本文关键词： 路面材料聚丙烯纤维混凝土冻融循环抗压强度纵波波速损伤量　出处：《交通运输工程学报》2016年04期 　论文类型：期刊论文

【摘要】：通过4组不同配合比聚丙烯纤维混凝土的快速冻融循环试验,测得了不同冻融循环次数后混凝土的抗压强度、纵波波速与动弹性模量,研究了冻融循环作用下不同配合比聚丙烯纤维混凝土的力学性能与损伤量特征,分析了材料性质、材料配合比与冻融循环次数对力学性能的影响。分析结果表明:冻融循环200次后,未掺加引气剂的C30聚丙烯纤维混凝土、掺加引气剂的C30聚丙烯纤维混凝土、未掺加引气剂的C40聚丙烯纤维混凝土、掺加引气剂的C40聚丙烯纤维混凝土的抗压强度损失率分别为46.53%、49.05%、34.56%、37.64%;冻融循环300次后,4组聚丙烯纤维混凝土纵波波速分别降低了8.42%、6.48%、16.72%、11.68%,动弹性模量分别降低了46.54%、35.72%、54.41%、53.72%;冻融循环150次后,C30和C40聚丙烯纤维混凝土损伤量迅速增长,且C40聚丙烯纤维混凝土损伤量高于C30聚丙烯纤维混凝土;在相同的冻融次数下,未掺加引气剂的C40聚丙烯纤维混凝土的损伤量最大;抗冻性能的改善效果从大到小依次为掺加引气剂C30聚丙烯纤维混凝土、未掺加引气剂C30聚丙烯纤维混凝土、掺加引气剂C40聚丙烯纤维混凝土、未掺加引气剂C40聚丙烯纤维混凝土。
[Abstract]:Through the 4 different mixing ratio of polypropylene fiber concrete fast freeze-thaw test, measured different freeze-thaw cycles of concrete compressive strength, longitudinal wave velocity and dynamic elastic modulus, the freeze-thaw cycle under different mixture ratio on mechanical properties and damage characteristics of polypropylene fiber concrete, analyzes the material properties, and the ratio of influence of freeze-thaw cycles on the mechanical properties of the material. With the analysis results show that after 200 cycles, not adding C30 polypropylene fiber concrete gas agent, adding C30 polypropylene fiber concrete air entraining agent, not adding C40 polypropylene fiber concrete gas agent, compressive strength loss with C40 polypropylene fiber concrete air entraining agent rate were 46.53%, 49.05%, 34.56%, 37.64%; after 300 cycles, 4 groups of polypropylene fiber concrete longitudinal wave velocity were decreased by 8.42%, 6.48%, 16.72%, 11.68%, 46.54%, to reduce the dynamic elastic modulus were 35.72%, 54.41%, 53.72%; after 150 cycles, the amount of damage of concrete C30 and C40 polypropylene fiber increased rapidly, and the C40 polypropylene fiber concrete damage was higher than that of C30 polypropylene fiber concrete; in the same number of freeze-thaw, not adding lead damage of polypropylene fiber concrete C40 gas agent is the biggest; antifreeze performance from high to low: adding air entraining agent C30 of polypropylene fiber concrete, without adding air entraining agent C30 of polypropylene fiber concrete, adding air entraining agent C40 of polypropylene fiber concrete, without adding air entraining agent C40 of polypropylene fiber concrete.

【作者单位】：中国科学院西北生态环境资源研究院冻土工程国家重点实验室;中国科学院大学资源与环境学院;中国地震局兰州地震研究所中国地震局黄土地震工程重点实验室;中交第一公路勘察设计研究院有限公司高寒高海拔地区道路工程安全与健康国家重点实验室;甘肃土木工程科学研究院;
【基金】：国家自然科学基金项目(41472297) 国家科技支撑计划项目(2014BAG05B05) 中国地震局地震预测研究所基本科研业务费专项项目(2014IESLZ01)
【分类号】：TU528

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