超高性能混凝土工作性与流变性的关系研究  

Research on the relationship between workability and rheology of ultra-high performance concrete

作　　者：商涛平 王洪新 孙德安[2] 吕帅灵 SHANG Taoping;WANG Hongxin;SUN Dean;LYU Shuailing(R&D Center of Municipal and Construction Engineering Industrialization,Shanghai Urban Construction Municipal Engineering(Group)Co.,Ltd.,Shanghai 200065,China;Shanghai University,Shanghai 200444,China)

机构地区：[1]上海城建市政工程(集团)有限公司市政与建筑工程工业化技术研发中心,上海200065 [2]上海大学,上海200444

出　　处：《混凝土与水泥制品》2023年第9期7-11,共5页China Concrete and Cement Products

摘　　要：研究了水胶比、粉煤灰和硅灰掺量、钢纤维对新拌超高性能混凝土(UHPC)工作性的影响,并对UHPC流变性进行了研究。结果表明:UHPC的流动性与流变性呈反比;增大水胶比和粉煤灰掺量,UHPC的流动性增大、黏度系数减小,而硅灰掺量对UHPC流动性的影响较小;掺入钢纤维会降低UHPC的流动性,而较短、较细的钢纤维对UHPC流动性的影响较大;UHPC的工作性随着成型后静置时间的延长而不断降低,每静置约1 h,其黏度系数增大约12.0~17.3 Pa·s。The effects of water binder ratio,the amount of fly ash and silica fume,and steel fiber on the workability of fresh ultra-high performance concrete(UHPC)were studied,and the rheology of UHPC was studied.The results show that the fluidity and rheology of UHPC are inversely proportional.By increasing the water binder ratio and fly ash amount,the fluidity of UHPC increases and the viscosity coefficient decreases,while the influence of the amount of silica fume on the fluidity of UHPC is lower.Adding the steel fiber can reduce the fluidity of UHPC,while the steel fiber with short length and small diameter has relatively much more effect on the fluidity of UHPC.The workability of UHPC decreases with standing time after production,and its viscosity coefficient increases by about 12.0~17.3 Pa·s per hour.

关 键 词：超高性能混凝土 水胶比 钢纤维 工作性 流变性 

分 类 号：TU528.572[建筑科学—建筑技术科学]