C70高强混凝土的配制及其耐久性研究  

Research onPreparation and Durability of the C70 High StrengthConcrete

作　　者：李世华 梁丽敏 陈华民 李章建 

机构地区：[1]云南建工集团有限公司,昆明650011

出　　处：《中国包装科技博览（混凝土技术）》2013年第3期42-45,共4页China Science and Technology Review

摘　　要：根据云南地区的原材料特性，采用低品质的Ⅱ级粉煤灰和$75矿粉复掺取代22％水泥来配制C70高强混凝土，并研究了其早期收缩性能、早期开裂性能、抗冻性能和抗氯离子渗透性能。结果表明：C70高强混凝土具有很好的工作性能、较高的早期强度、良好的抗冻性能和抗氯离子渗透性能，抗冻等级达到F650，抗氯离子渗透性能等级为Q—V和RCM-V。C70高强混凝土的早期收缩较大，1d内的收缩较为显著，早期抗裂性能等级为L一Ⅲ。According tothecharacteristic of Yunnan region＇ s raw materials, C70 high strength concrete was prepared using low qualitycompoundmineral admixtures to replace 22% cement （ by mass ） . And its early-age shrinkageproperty, anti-cracking behavior, frost resistance and chloride anti-penetration performance were tested.The results showed that the working performance of C70 high strength concrete was better and its early strength was higher. Its frost resistance and chloride anti-penetration performance were better. The frost resistant grade reached to F650 and thechloride anti-penetration performance level was Q-V or RCM-V.However, the early-age shrinkage property of the C70 high strength concrete was greater, particularly 24 hours shrinkage. The early anti-cracking behaviorlevel was L- Ⅲ.

关 键 词：高强混凝土 早期收缩 抗裂性能 抗冻性能 抗氯离子渗透性能 

分 类 号：TU528[建筑科学—建筑技术科学]