800 m输送C25W8F100混凝土配合比优化研究  

作　　者：方小利 李继晓 拜胜伟 左忠富 

机构地区：[1]云南恒达混凝土有限公司,云南昆明650032 [2]云南承龙混凝土有限公司,云南昆明650212

出　　处：《科技创新与应用》2022年第20期98-101,105,共5页Technology Innovation and Application

摘　　要：为保障C25W8F100混凝土800 m距离顺利输送,根据施工现场的实际浇筑施工方案,文章通过对影响混凝土和易性及可泵性的三个主要因素即砂率、石子粒径、混凝土含气量进行试验优化。确定最佳的砂率范围为55%~60%;级配石的最佳粒径范围为5~20 mm;混凝土含气量最佳范围为3.2%~3.9%。由于运输距离约30 km且搅拌车行驶耗时至少60 min,我们将混凝土的保坍时间调整到2 h内基本无塌落度损失。研究结果表明,优化确定的混凝土配合比很好的满足施工现场的浇筑质量要求。In order to ensure the smooth transportation of C25W8F100 concrete at a distance of 800 m,according to the actual pouring construction scheme of the construction site,this paper optimizes the three main factors affecting the workability and pumpability of concrete,namely sand ratio,stone particle size and air content of concrete.It is determined that the best range of sand ratio is 55%-60%,the best particle size range of graded stone is 5 mm-20 mm,and the best range of air content of concrete is 3.2%-3.9%.Because the transportation distance is about 30 km and the driving time of the mixer is at least 60 min,we adjust the collapse time of concrete to almost no collapse loss within 2 hours.The research results show that the optimized concrete mix ratio can meet the pouring quality requirements of the construction site.

关 键 词：砂率 石子粒径 混凝土含气量 和易性 10分制 

分 类 号：TU528[建筑科学—建筑技术科学]