超高性能混凝土工作性和力学性能的影响因素研究  

Study on the Influencing Factors of Workability and Mechanical Properties of Ultra-high Performance Concrete

作　　者：李世华 郑倩 梁丽敏 张家祥 LI Shi-hua;ZHENG Qian;LIANG Li-min;ZHANG Jia-xiang(Yunnan Construction Investment Holding Green and High Performance Concrete Co.,Ltd.,Kunming 650501,China;Yunnan Engineering Research Center of High Performance Concrete,Kunming 650501,China)

机构地区：[1]云南建投绿色高性能混凝土股份有限公司,云南昆明650501 [2]云南省高性能混凝土工程研究中心,云南昆明650501

出　　处：《混凝土与水泥制品》2022年第12期53-57,共5页China Concrete and Cement Products

基　　金：云南省交通运输厅科技项目(云交科教便[2021]98号)。

摘　　要：研究了水胶比、胶砂比、矿物掺合料的类型及掺量对超高性能混凝土(UHPC)工作性和力学性能的影响。结果表明:适当增大水胶比和胶砂比、掺入适量矿物掺合料均对UHPC的工作性有积极影响;随着水胶比的增加,UHPC的抗压强度基本呈降低趋势;胶砂比对UHPC抗压强度的影响不明显;掺入适量矿物掺合料(硅灰+超细粉煤灰微珠)可显著提高UHPC的28 d抗压强度。综合考虑工作性和力学性能,UHPC的推荐配合比为:水胶比控制在0.16~0.18,胶砂比控制在1.00~1.15,矿物掺合料(硅灰+超细粉煤灰微珠)总掺量控制在25%~35%,超细粉煤灰微珠掺量控制在15%~25%。The effects of water-binder ratio,binder-sand ratio,type and content of mineral admixture on the workability and mechanical properties of ultra-high performance concrete(UHPC)were studied.The results show that the workability of UHPC is positively affected by properly increasing the water-cement ratio and the binder-sand ratio,and adding appropriate content of mineral admixtures.With the increase of water-binder ratio,the compressive strength of UHPC generally decreases.The binder-sand ratio has no obvious effect on the compressive strength of UHPC.The 28 d compressive strength of UHPC can be significantly improved by adding appropriate content of mineral admixtures(silica fume and superfine fly ash microbeads).Considering the workability and mechanical properties of UHPC comprehensively,it is recommended that the mix proportion of UHPC should be controlled as follows:the water-binder ratio should be controlled within 0.16~0.18,the binder-sand ratio should be controlled within 1.00~1.15,the total content of mineral admixture(silica fume and superfine fly ash microbeads)should be controlled within 25%~35%,and the content of superfine fly ash microbeads should be controlled within 15%~25%.

关 键 词：超高性能混凝土 工作性 抗压强度 矿物掺合料 水胶比 胶砂比 

分 类 号：TU528.041[建筑科学—建筑技术科学]