岷江航电枢纽天然特细砂混凝土配合比试验研究  

Experimental research on the mix ratio of natural ultra-fine sand concrete for Minjiang Navigation and Power Hub

作　　者：肖灿明 陈星艮 蒲秀媛 XIAO Canming;CHEN Xinggen;PU Xiuyuan(China Water Resources and Hydropower Fifth Engineering Co.,Ltd.,Chengdu 610066,China;School of Water Resources and Hydropower,Sichuan University,Chengdu 610065,China)

机构地区：[1]中国水利水电第五工程有限公司,四川成都610066 [2]四川大学水利水电学院,四川成都610065

出　　处：《武汉大学学报(工学版)》2024年第S2期202-206,共5页Engineering Journal of Wuhan University

摘　　要：岷江航电枢纽天然砂储量丰富,但开挖疏浚过程中得到的天然砂大部分为特细砂,对混凝土性能影响较大。本文通过采用最佳搭配比例的机制砂与天然特细砂混合砂作为细骨料配制航电枢纽C40混凝土,研究了混合砂混凝土水胶比、胶凝材料种类对力学性能和绝热温升性能的影响。结果表明:应用天然特细砂掺合机制砂配制混凝土,能配制出满足设计要求的混凝土;随着水胶比的增大,混合砂混凝土强度逐渐减小,实际工程中控制水胶比在0.35~0.4,工作性能满足施工设计要求;利用峨胜水泥制备的混凝土与利用嘉华低热水泥制备的混凝土最终强度基本保持一致,嘉华低热水泥混凝土能更好地控制前期温升速率,最终温升较峨胜普硅水泥混凝土降低10.6%,有利于大体积混凝土裂缝防控。The Minjiang Navigation and Power Hub boasts abundant natural sand reserves.However,the majority of the natural sand obtained from excavation and dredging is ultra-fine sand,which significantly affects concrete performance.This study investigates the impact of the water-binder ratio and the type of cementitious materials on the mechanical properties and adiabatic temperature rise of C40 concrete for the Navigation and Power Hub by using an optimal blend of machine-made sand and natural ultra-fine sand as fine aggregates.The findings indicate that employing natural ultra-fine sand blended with machine-made sand enables the preparation of concrete that meets design specifications.As the waterbinder ratio increases,the strength of the mixed sand concrete gradually diminishes.In practical engineering,the water-binder ratio is maintained between 0.35~0.4,ensuring that the workability meets construction design standards.The ultimate strength of concrete made with Esheng cement remains consistent with that of concrete made with Jiahua low-heat cement.Jiahua low-heat cement concrete y controls the initial rate of temperature rise more effectively,with a final temperature rise 10.6%lower than that of Eshengpu silicon cement concrete,facilitating crack prevention and control in massive concrete structures.

关 键 词：岷江 航电枢纽 天然特细砂 混凝土 配合比 

分 类 号：TU528[建筑科学—建筑技术科学]