C60低收缩徐变高性能混凝土的配制与试验研究

发布时间：2018-01-09 07:03

本文关键词：C60低收缩徐变高性能混凝土的配制与试验研究　出处：《世界桥梁》2014年06期 　论文类型：期刊论文

【摘要】：为配制出适用于大跨度桥梁工程的高性能混凝土,通过掺加大掺量优质的粉煤灰、矿粉,降低水胶比的方法,进行C60低收缩徐变高性能混凝土的配制与试验研究。试验结果表明:采用优化设计混凝土配合比配制出的混凝土拌合物出机坍落度为170~215mm,2h坍落度损失较小,压力泌水率较低,表现出良好的工作性能;混凝土28d抗压强度较高,达到C60强度等级;掺加矿物掺合料的混凝土具有较低的收缩和徐变,与不掺矿物掺合料的混凝土相比,长龄期(360d)的收缩和徐变值降低了30%~50%;通过掺加大掺量矿物掺合料、降低水胶比的方法可以配制出C60低收缩徐变的高性能混凝土,该混凝土可用于塔柱和预应力混凝土箱梁中。
[Abstract]:For the preparation of high performance concrete for large span bridge engineering, increase the content of high quality by mixing fly ash, slag, method of reducing water binder ratio, preparation and test of Xu Biangao low shrinkage performance of concrete C60. The experimental results show that the optimization design of the mixture ratio of the concrete made of concrete mixture a machine for 170~215mm 2H slump, slump loss is small, pressure bleeding rate is low, showing good performance; the higher concrete compressive strength of 28d, reach the grade of C60; it has low shrinkage and creep of adding mineral admixture of concrete material, compared with not containing mineral additive of concrete. Long age (360D) shrinkage and creep value is reduced by adding 30%~50%; increase the amount of mineral admixture, method of reducing water binder ratio can be made up of C60 high performance concrete with low shrinkage and creep, the concrete can be used in the tower And in the prestressed concrete box girder.

【作者单位】：中铁大桥局集团桥科院有限公司;桥梁结构安全与健康湖北省重点实验室;
【分类号】：TU528
【正文快照】： 1前言近年来,国内一些大跨度连续梁桥和连续刚构桥,在运营几年后主梁都不同程度地出现了跨中挠度过大和截面开裂问题,而且挠度和裂缝均随时间延续而不断发展,加剧了桥梁工作状况的劣化。这些桥梁建设实践表明,混凝土收缩徐变对混凝土结构的长期性能影响较大,主要体现为影响桥

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