水力发电2017，Vol.43Issue(9)：49-52,4.
纳米材料改善普通干湿喷射混凝土回弹率和强度现场工艺试验
Field Tests on Rebound Ratio and Strength of Ordinary Dry and Wet Shotcrete Mixed with Nano Admixture
丁建彤 1吴勇 1雷英强1
作者信息
- 1. 中国水利水电第七工程局有限公司,四川 成都610081
- 折叠
摘要
Abstract
The overall rebound ratio of grade C20-C30 ordinary dry or wet shotcrete tor the side walls and top arch of underground structures are generally about 20％ to 30％,and the strength of dry shotcrete is often unqualified.The in-situ spraying tests of such shotcrete in four projects of Beijing-Zhangjiakou Intercity Railway,Baihetan Hydropower Station,Guolangqiao Hydropower Station and Chengdu Subway Line 18 show that,by replacing 10％ of cement with HB7-2 inorganic nano admixture developed by Sinohydro Bureau 7 Co.,the rebound ratios of C20-C30 ordinary dry or wet shotcrete can be reduced by 52％ to 72％ and achieve the level of less than 10％,the maximum spayed thickness in one-pass can reached 30 cm,the initial strength within 24 h is greatly increased,and the 28 d compressive strength is increased by more than 20％.The application of this nano admixture can save at least 0.7 h in each excavation and supporting cycle,therefore,the quality,safety and cost of underground construction can be overall improved.关键词
纳米材料/喷射混凝土/回弹率/强度Key words
Nano admixture/shotcrete/rebound ratio/strength分类
建筑与水利引用本文复制引用
丁建彤,吴勇,雷英强..纳米材料改善普通干湿喷射混凝土回弹率和强度现场工艺试验[J].水力发电,2017,43(9):49-52,4.
