期刊论文

中文

硅酸盐通报

1001-1625

2019

38

1

14-21

10.16552/j.cnki.issn1001-1625.2019.01.003

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项目(16BCX01).

本校为第一机构

使用粉煤灰代替部分水泥有利于减少资源消耗,降低超高性能混凝土（UHPC）造价。同时,水胶比对掺粉煤灰UHPC的施工性能和力学性能具有重要影响。为此,将水胶比设定为唯一变量,研究水胶比对UHPC施工与力学性能的影响规律。开展了水胶比为0. 16～0. 25UHPC的扩展度、抗压强度和弯曲韧性试验,得到了UHPC充分湿拌时间、静停一段时间后的扩展度、抗压、抗折强度和弯曲应力-挠度曲线;对抗压、抗折强度结果进行了变异性分析;基于应力-挠度曲线,并结合CECS 13:2009和Nemkumar法计算了UHPC弯曲韧性指标。试验结果显示:UHPC充分湿拌时间为6 min; UHPC扩展度随水胶比增大基本呈线性增长,且水胶比每增加0. 01...

The use of fly ash instead of some cement is beneficial to reduce resource consumption and reduce the cost of ultra-high performance concrete(UHPC).At the same time,the water-to-binder ratio has an important influence on the construction performance and mechanical properties of UHPC mixed with fly ash.Therefore,the water-to-binder ratio was set as the only variable to study the effect of water-to-binder ratio on the construction and mechanical properties of UHPC.The sufficient wet mixing time,Slump extension under a standing time,compression strength,flexural strength and flexural stress-defle...