Analysis of microcracks in upper surface of concrete due to elevated temperature during paving asphalt
Analysis of microcracks in upper surface of concrete due to elevated temperature during paving asphalt
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沥青摊铺过程中温度升高导致混凝土上表面微裂纹分析
DOI：
10.11532/structcivil.65a.552
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
田中 伸介
中科院分区：
文献类型：
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作者：
小松 怜史;島倉 稔宗;樋口 勇輝;田中 伸介
本文通过试验和数值模拟研究了混凝土上表面微裂纹的产生机理。在前人研究的基础上，认为防水层的存在促进了微裂缝的产生。结果表明，当混凝土含水率较高时，混凝土会产生微裂缝。采用透水性底漆防水层、保证混凝土内足够的含气量或混凝土上表面抛光等措施可有效地减少微裂缝的产生。只有当混凝土内部温度应力增大，同时微孔隙内水蒸气压力增大时，才会产生裂缝。
In this research, mechanism of generating microcracks in upper surface of concrete was investigated by experiments and numerical simulations. Based on the past researches, the authors assumed that generation of microcracks was promoted by waterproofing layer. As the results, it was found that microcracks were generated when moisture content of concrete is relatively high. Using waterproofing layer with permiable type primer, securing sufficient air content in concrete or polishing on upper surface of concerte were effective on mitigating microcracks. Furthermore, these cracks could be occurred only when thermal stress is increased in concrete, and vapor pressure is increased in micro pores, simulatenously.