- 目录
- 混凝土与制品
- 首页
桥梁清水自密实混凝土的工作性能及早期抗裂性能研究
作者：孟书灵1，2，卢霄2，艾洪祥2，李凯2，王子萌2
（1.长安大学，陕西 西安 710000；2.中建西部建设新疆有限公司，新疆 乌鲁木齐 830000）
摘要：结合桥梁清水自密实混凝土工程特点及要求，从原材料筛选、胶材用量及掺合料比例调整、骨料类型及粒径控制、最佳砂率选取等方面进行配合比设计，选取最佳清水处理工艺，探讨自密实工作性能影响因素，对比试件表观性能指标，开展耐久性试验。结果表明：制备的桥梁清水自密实混凝土倒坍时间1.8 s，V漏时间12 s，间隙通过性好，自密实性能优良，含气量1.8%，无明显色差，无裂缝，表面气泡极少，清水表观性能优秀，耐久性好。
关键词：桥梁；清水混凝土；自密实；工作性；表观性能；抗裂性能
中图分类号：TU528.38 文献标识码：A 文章编号：1001-702X（2020）05-0005-05
Study on workability and early crack resistance of bridge fair-faced self-compacting concrete
MENG Shuling1，2，LU Xiao2，AI Hongxiang2，LI Kai2，WANG Zimeng2
（1.Changan University，Xi'an 710000，China；2.China West Construction Xinjiang Group Co. Ltd.，Urumqi 830000，China）
Abstract：This project combines the characteristics and requirements of bridge fair-faced self-compacting concrete project，and designs mix proportion from raw material selection，mortar dosage and admixture proportion adjustment，aggregate type and particle size control，optimal sand ratio selection and so on. It chooses the best fair-faced treatment technology，explores the influencing factors of self-compacting performance，compares the apparent performance index of specimens，and carries out durability test. The results show that the prepared bridge self-compacting concrete with fair-faced has good collapsing time of 1.8 s，V leakage time of 12 s，good clearance passage，excellent self-compacting performance，1.8% air content，no obvious color difference，no cracks，very few surface bubbles，excellent fair-faced apparent performance and good durability.
Key words：bridge，fair-faced concrete，self-compacting，workability，apparent performance，crack resistance