复杂侵蚀环境下透水混凝土耐久性能试验研究
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TU528

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上海市优秀技术带头人计划(16XD1422400),上海市青年科技启明星计划(13QB1403100)


Experimental analysis on durability of pervious concrete under complex attack environments
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    摘要:

    为适应海绵城市建设对高耐久性透水混凝土的需求,配置了低品质活性矿物掺合料透水混凝土和聚丙烯仿钢纤维(PPTF)透水混凝土两个系列。前期已进行了基本性能研究,在此基础上,继续开展复杂多因素侵蚀环境下耐久性能研究。试验采用侵蚀溶液全浸泡方式,共持续300 d,宏观上测试了抗压强度和抗折强度随侵蚀时间的劣化规律,微观上用SEM观测了胶结层的微观结构、用EDS观测了胶结层的化学组成。复杂侵蚀环境下,透水混凝土微观结构变化规律与其宏观力学性能变化规律基本相符。综合基本性能和耐久性能,择优推荐复掺低品质硅灰和低品质粉煤灰透水混凝土和掺3 kg/m3锯齿形PPTF透水混凝土。这两种透水混凝土基本性能均满足城市既有住区道路、人行道、城市广场、体育场、户外停车场、园林景观道路等轻交通路面的使用要求,同时,又表现出了良好的耐久性能。

    Abstract:

    In order to adapt to the requirement of sponge city construction for high durable pervious concrete, pervious concrete mixed with low-quality active mineral admixture and pervious concrete mixed with Polypropylene Thick Fiber(PPTF) are developed. In the early stage, basic performance studies have been carried out, and on this basis, it is continued to conduct durability studies under complex attack environments. By the method of full-immersion, experiments last for 300 d. Macro-observations involve the deterioration regularity of both compressive strength and flexural strength with attack time. Micro-observations involve microstructure of cemented layer by SEM and chemical composition of cemented layer by EDS. Under complex attack environments, the change of pervious concrete micro-structural is in accord with macro-mechanical behavior. Combined basic performance with durability, pervious concrete mixed with both low-quality silica fume and low-quality fly ash and pervious concrete mixed with zigzag PPTF of 3 kg/m3 are preferred recommended. This two kinds of pervious concrete meet the application requirement of light traffic pavements such as existing residential area road, sidewalk, city square, stadium, outdoor parking lot, landscape road, which durability is good.

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杨波,高润东,许清风.复杂侵蚀环境下透水混凝土耐久性能试验研究[J].土木与环境工程学报(中英文),2018,40(3):53-60. Yang Bo, Gao Rundong, Xu Qingfeng. Experimental analysis on durability of pervious concrete under complex attack environments[J]. JOURNAL OF CIVIL AND ENVIRONMENTAL ENGINEERING,2018,40(3):53-60.10.11835/j. issn.1674-4764.2018.03.008

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  • 收稿日期:2017-06-05
  • 在线发布日期: 2018-04-26
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