补偿收缩纤维混凝土强度及变形性能研究

关键字：补偿收缩,纤维混凝土,强度,变形,性能

（太原市小店区建设工程质量监督站，山西 太原  030032）

    摘要：研究了粉煤灰、膨胀剂及聚丙烯纤维掺量对补偿收缩纤维混凝土抗压强度、抗裂性能及变形性能的影响。结果表明：适当的粉煤灰掺量不仅有利于提高混凝土的后期强度，同时可以显著提高混凝土的限制膨胀率；随着膨胀剂掺量的增加，混凝土的强度略有降低，限制膨胀率增幅较大；掺加适量的聚丙烯纤维有利于改善混凝土的抗裂性能，显著降低混凝土转空干后的收缩变形，聚丙烯纤维的较优掺量为0.8 kg/m3。
    关键词：补偿收缩混凝土；限制膨胀率；粉煤灰；膨胀剂；聚丙烯纤维
    中图分类号：TU528.55        文献标识码：A        文章编号：1001-702X（2017）08-0137-04

Research on strength and deformation of shrinkage-compensating concrete
QI Zhiqiang
（Taiyuan Xiaodian District Supervision Station of Construction Project Quality，Taiyuan 030032，China）

    Abstract：The effect of fly ash，expansion agent and polypropylene fiber content on compressive strength，crack resistance and deformation performance of shrinkage fiber concrete were studied. The results show that proper amount of fly ash is not only beneficial to increase the strength of concrete，but also can significantly improve the rate of limited expansion of concrete. With the increase of the amount of the expansive agent，the concrete strength is slightly lower，and the expansion ratio of concrete is larger. Adding proper amount of polypropylene fiber is beneficial to improve the crack resistance of concrete and significantly reduce the shrinkage deformation of concrete. The optimum content of polypropylene fiber is 0.8 kg/m3.
    Key words：shrinkage-compensating concrete，limited expansion rate，fly ash，expansive agent，polypropylene fibers