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.

U213.2+44

国家自然科学基金(52078490)