摘要
针对地铁板式无砟轨道自密实混凝土施工过程中因运距远、温度高导致的流动性损失、难以施工问题,通过模拟灌板试验,研究不同工况下自密实混凝土流动性调控技术。结果表明,地下运输距离较短时(小于5km),自密实混凝土采用普通型减水剂即可满足施工要求;地下运输距离较长时(大于5km),为保证自密实混凝土有较好的流动性能,需加入超缓凝型减水剂才满足施工要求;当温度在20℃左右时,掺入3.0%普通型减水剂的自密实混凝土流动性良好,满足施工要求;当温度高于35℃时,掺入2.8%缓凝型减水剂以改善自密实混凝土的保坍性和流动性,满足施工要求。
Aiming at the problem of fluidity loss and difficult construction caused by long distance and high temperature during the construction of self-compacting concrete for subway slab ballastless track, this paper studies the fluidity control technology of self-compacting concrete under different working conditions by simulating the slab filling experiment. The results show that when the underground haul distance is short(less than 5km), the self-compacting concrete can meet the construction requirements by using ordinary water reducer. When the underground haul distance is long(more than 5km),in order to ensure that the self-compacting concrete still has good flow properties, it is necessary to add super-retarding water reducing agent to meet the construction requirements. When the temperature is around 20°C, the self-compacting concrete mixed with 3.0% ordinary water reducing agent has good fluidity and meets the construction requirements.When the temperature is higher than 35℃, 2.8% retarder water reducing agent is added to improve the slump retention and fluidity of self-compacting concrete and meet the construction requirements.
作者
管吉波
张宏波
郑晓练
刘锦辉
柴剑平
李颖洁
彭杰波
曾晓辉
GUAN Jibo;ZHANG Hongbo;ZHENG Xiaolian;LIU Jinhui;CHAI Jianping;LI Yingjie;PENG Jiebo;ZENG Xiaohui(Shenzhen Municipal Design and Research Institute Co.,Ltd.,Shenzhen 518038;China Railway No.5 Engineering Group Co.,Ltd.,Changsha 410117;Shenzhen Metro Group Co.,Ltd.,Shenzhen 518038;China Railway No.3 Engineering Group Co.,Ltd.,Taiyuan 030001;School of Civil Engineering,Central South University,Changsha 410075)
出处
《中国建材科技》
CAS
2023年第1期38-42,共5页
China Building Materials Science & Technology
基金
国家自然科学基金(52078490)。
关键词
自密实混凝土
远距离运输
高温
减水剂
self-compacting concrete
long-distance transportation
high temperature
water reducer
