微细钢纤维快硬高强混凝土弯曲性能试验

发布时间：2018-02-27 12:49

本文关键词： 微细钢纤维高强快硬弯曲韧性　出处：《土木工程与管理学报》2017年02期 　论文类型：期刊论文

【摘要】：试验采用微细钢纤维和快硬硫铝酸盐特种水泥,配制了高强、高韧性和快凝早强高性能混凝土,可用于机场跑道、公路路面、桥面和市政道路的修复加固工程以及其他建筑工程抢险加固等。开展了弯曲韧性试验,分析纤维掺量和养护龄期对弯曲韧性指标的影响规律;研究了纤维掺量、龄期、水胶比等因素对强度和弯曲韧性的影响。结果表明:混凝土12 h抗压强度可达40 Mpa,1 d抗压强度可达60 Mpa;纤维掺量、龄期和水胶比是影响强度的主要因素;最优纤维掺量是1%,最优水胶比是0.24;微细钢纤维的掺入显著提高了弯曲韧性,最优配比时各项弯曲韧性指数均不小于0.50;当龄期达到1 d及以上时,龄期对弯曲韧性指数和弯曲试验曲线的饱满程度影响不明显。
[Abstract]:The test uses fine steel fiber and special cement of fast hardening sulphoaluminate, compounding high strength, high toughness and fast setting early strength high performance concrete, which can be used in airport runway and highway pavement. The flexural toughness test was carried out to analyze the influence of fiber content and curing age on the flexural toughness index, and the fiber content and age were studied. The effect of water / binder ratio on strength and flexural toughness. The results show that the compressive strength of concrete can reach 40 Mpa-1 d at 12 h, and the content of fiber, age and water-binder ratio are the main factors affecting the strength. The optimum fiber content is 1 and the optimum water-binder ratio is 0.24. The flexural toughness is significantly improved by the addition of micro-steel fiber, and the flexural toughness index is not less than 0.50 when the optimum blending ratio is not less than 0.50, and when the age reaches 1 day or more, the flexural toughness index is not less than 0.50. The effect of age on flexural toughness index and full degree of bending test curve was not obvious.
【作者单位】：郑州大学土木工程学院;郑州大学力学与工程科学学院;
【基金】：国家自然科学基金(51308504) 河南省科技攻关项目(152102310068) 教育部高等学校博士学科点专项科研基金(20124101120013)
【分类号】：TU528.572

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