F400抗冻等级大坝全级配混凝土配制技术与试验研究  

Preparation technology and experimental study of fully-graded dam concrete with F400 freeze-thaw resistance grade

作　　者：孔祥芝[1] 陈改新[1] 张秀菘 计涛[1] 武帅[2] 纪国晋[1] KONG Xiangzhi;CHEN Gaixin;ZHANG Xiusong;JI Tao;WU Shuai;JI Guojin(State Key Laboratory Simulation and Regulation of Water Cycle in River Basin,China Institute of Water Resources and Hydropower Research,Beijing 100038,China;China Water Resources Beifang Investigation,Design and Research Co.,Ltd.,Tianjin 300222,China)

机构地区：[1]中国水利水电科学研究院流域水循环模拟与调控国家重点实验室,北京100038 [2]中水北方勘测设计研究有限责任公司,天津300222

出　　处：《混凝土》2023年第1期136-139,145,共5页Concrete

基　　金：国家自然科学基金(51879286);十三五国家重点研发计划(2018YFC0406701);中国水科院科研基金项目(SM0145B442017,SM0145B632017)。

摘　　要：实践证实,大坝实体全级配混凝土的抗冻性能低于湿筛二级配混凝土,往往达不到设计的F200或F300抗冻等级。系统分析了混凝土冻融损伤机理与影响全级配混凝土耐久性的因素,提出了高抗冻等级全级配混凝土配制技术思路,通过原材料优选,配合比设计,配制出了抗冻等级达到F400的全级配混凝土。分析认为,品质优越的原材料是配制高抗冻等级大坝混凝土的基础,配合比设计是关键,拌和与浇筑过程质量控制是保障。Practice has proved that the freeze-thaw resistance of fully-graded dam concrete is lower than that of wet screened concrete,which often cannot reach the designed freeze-thaw resistance grade of F200 or F300.The freeze-thaw damage mechanism of concrete and the factors affecting the durability of fully-graded concrete are systematically analyzed,and the idea of improving its freeze-thaw resistance grade was put forward.Through optimizing raw materials and designing mix proportion,the fully-graded concrete with freeze-thaw resistance grade up to F400 is been produced.The analysis shows that the raw materials with superior quality are the basis for the preparation of dam concrete with high freeze-thaw resistance grade,the mix proportion design is the key,and the quality control of mixing and pouring process is the guarantee.

关 键 词：大坝混凝土 全级配混凝土 F400 抗冻等级 

分 类 号：TU528.01[建筑科学—建筑技术科学]