ISSN 1008-5548

CN 37-1316/TU

2023年29卷  第2期
<返回第2期

水胶比对超高性能混凝土强度的影响

Effect of water-binder ratio on strength of ultra-high performance concrete

王双飞1,柯国军1,彭 勃2,李 军2,邱浩群2

(1. 南华大学 土木工程学院; 中国核建高性能混凝土实验室,湖南 衡阳 421001;2. 湖南固特邦土木技术发展有限公司,湖南 长沙 410205)


DOI:10.13732/j.issn.1008-5548.2023.02.016

收稿日期:2022-09-25,修回日期:2022-10-21,在线出版时间:2023-03-02 09:25。

基金项目:湖南省自然科学基金衡阳联合项目,编号:2019JJ60003。

第一作者简介:王双飞(1998—),男,硕士研究生,研究方向为高性能与超高性能混凝土及固体废渣利用。E-mail:1542683896@qq.com。

通信作者简介:柯国军(1964—),男,教授,硕士,硕士生导师,研究方向为高性能与超高性能混凝土及固体废渣利用。E-mail:1132980799@qq.com。


摘要:利用紧密堆积理论设计胶凝材料和细骨料的配合比,研究不同水胶比(0.135~0.165,质量分数,下同)对超高性能混凝土(ultra-high performance concrete, UHPC)施工性能、抗压强度的影响;对不同水胶比的UHPC拌合物进行含气量(体积分数,下同)测试;并利用低场磁共振分析和扫描电镜分析,研究UHPC试件的孔结构和微观形貌。结果表明:随着水胶比的增大,UHPC拌合物的扩展度增大并呈现线性关系;UHPC的抗压强度随着水胶比的增大呈现先增大后减小的趋势,在水胶比为0.15时抗压强度达到最大;水胶比为0.15时含气量最小,并且抗压强度与含气量之间存在良好的线性关系;水胶比为0.15时的孔结构最优,基体最密实。

关键词:超高性能混凝土;水胶比;抗压强度;扩展度;孔结构;含气量

Abstract:By using of design of the mix proportion of the cementitious materials and fine aggregate based on close packing theory, the influence of different water-binder ratio(0.135~0.165, mass fraction) on the workability and compressive strength of ultra-high performance concrete(UHPC) were studied. The air content(volume fraction) of UHPC mixture with different water binder ratio were tested. The pore structure and micro morphology of UHPC specimens were studied by low field magnetic resonance analysis and scanning electron microscopy. The results show that with the increasing of water-binder ratio, the expansion of UHPC mixture increases and presentes a linear relationship. The compressive strength of UHPC increases first and then decreases with the increasing of water-binder ratio, and reaches the maximum when the water-binder ratio is 0.15. When the water-binder ratio is 0.15, the air content is the minimum, and there is a good linear relationship between the compressive strength and the air content. When the water binder ratio is 0.15, the pore structure is the best and the matrix is the densest.

Keywords:ultra-high performance concrete; water-binder ratio; compressive strength; expansibility; pore structure; air content


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