掺复合活性剂及聚酯纤维的混凝土早期抗裂性研究
Early Crack Resistance of Concrete Mixed with Composite Active Agent and Polyester Fiber
关键词：
混凝土；复合活性剂；聚酯纤维；早期抗裂；细观结构
Key words：
Concrete; Composite active agent; Polyester fiber; Early crack resistance; Microstructure
刊期：
２０19年第10期
DOI：
10.19761/j.1000-4637.2019.10.049.04
文章编号：
基金项目：
江苏省高校“青蓝工程”优秀教学团队项目（JSQL GC2017-TD60）；泰州职业技术学院创新团队项目（TZYTD-16-5）。
作者：
姜 晔1，芦 浩2
单位：
1.泰州职业技术学院，225300；2.河海大学水利水电学院，南京 210098
摘要
摘 要：通过刀口模诱导开裂试验，研究了复合活性剂+聚酯纤维对混凝土抗裂收缩性能的影响，同时采用宏观性能试验和细观结构图像分析了抗裂机理。研究表明，复合活性剂+聚酯纤维掺入后，试样裂缝开裂面积减少率效果显著。
Abstract: The early cracking shrinkage resistance of concrete with composite active agent and polyester fiber was investigated by knife mold induced cracking plate test. The crack resistance mechanism was analyzed by using mechanical tests and microstructure image analysis. The results show that the crack cracking area of sample is significantly reduced after incorporating composite active agent and polyester fiber.
结论
（1）宏观上，复合活性剂+聚酯纤维的掺入能明显减少混凝土早期开裂风险，其宽大裂缝数量显著减小，裂缝总开裂面积相比基准混凝土减少了88%；保水能力提高了40.9%，早期（7 d）劈裂抗拉强度提高了12.2%。
（2）细观上，复合活性剂+聚酯纤维对胶砂细观结构有改善作用，未水化的水泥颗粒和干缩微裂缝数量减少，水泥-骨料界面区孔隙率较基准胶砂减小了48.8%，结构更为密实。
（3）抗裂机理上，复合活性剂+聚酯纤维的掺入提高了保水能力，防止了干缩微裂缝产生，同时纤维对微裂缝的开展和延伸有限制作用；骨料界面区黏结能力得到提升，结构更为密实，提高了劈裂抗拉性能，抵抗了干缩开裂。
参考文献
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引用本文
姜晔,芦浩.掺复合活性剂及聚酯纤维的混凝土早期抗裂性研究[J].混凝土与水泥制品,2019(10):49-52.
JIANG Y,LU H.Early Crack Resistance of Concrete Mixed with Composite Active Agent and Polyester Fiber[J].China Concrete and Cement Products,2019(10):49-52.
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