期刊论文

Effect of Vibratory Mixing on the Construction and Mechanical Properties of Ultra-High Performance Concrete

中文

硅酸盐通报

1001-1625

2019

38

8

2586-2594

10.16552/j.cnki.issn1001-1625.2019.08.037

国家自然科学基金(51778069) 973计划项目(2015CB057700) 湖南省研究生科研创新项目(CX2016B386) 长沙理工大学南方地区桥梁长期性能提升技术国家地方联合工程实验室开放基金(16BCX01)

本校为第一机构

搅拌过程是超高性能混凝土（UHPC）获得良好施工性能及实现优异力学性能的重要环节。为此,设计两个UHPC配合比,分别采用传统单、双卧轴强制搅拌及振动搅拌,通过对比试验研究振动搅拌对UHPC施工及力学性能影响。通过扩展度、抗压强度和四点弯曲试验,得到了各组UHPC随不同湿拌时间的扩展度、充分湿拌时间、静停一段时间扩展度损失量、抗压、抗折强度、能量吸收、断裂能及弯曲应力-挠度曲线及四点弯曲出现可视裂纹时下缘等效拉应力;对抗压、抗折强度进行了变异性分析;利用应力-挠度曲线,基于规范及其改进法、Nemkumar法计算了弯曲韧性指标。结果表明:湿拌时间相同时,振动搅拌相较强制搅拌可显著提升...

Mixing process is an important segment for ultra-high performance concrete(UHPC)to obtain good construction performance and achieve its excellent mechanical properties.Therefore,two mix ratios of UHPC were designed,and the traditional single horizontal-shaft forced mixing,twin horizontal-shaft forced mixing and twin horizontal-shaft vibratory mixing were used respectively.The effects of vibratory mixing on construction and mechanical properties of UHPC were studied through comparative experiments.The expansion of each group of UHPC with different wet mixing time,full wet mixing time,loss of ex...