混凝土高效抗裂剂在徐州轨道交通地下工程中的

2.高性能土木工程材料国家重点实验室，江苏苏博特新材料股份有限公司，江苏 南京  211103）

    摘要：轨道交通地下车站侧墙中温度开裂是其最主要的开裂形式，主要是由于结构温升高，且拆模后快速的降温造成收缩开裂。基于此，在混凝土中掺入HME-V混凝土（温控、防渗）高效抗裂剂，该抗裂剂能够降低水泥水化速率，进而降低混凝土结构温升及温度开裂风险；并且抗裂剂自身膨胀组分水化产生膨胀，进一步补偿混凝土自收缩及后期温度收缩。HME-V混凝土（温控、防渗）高效抗裂剂在徐州轨道交通2号线市政府站中得到了成功的应用，全站侧墙中未见任何贯穿性裂缝。

    关键词：抗裂；温度裂缝；水化调控；混凝土温升；轨道交通

    中图分类号：TU528.042        文献标识码：A        文章编号：1001-702X（2018）07-0052-03

 

Application of concrete anti-crack agent in underground structure of Xuzhou subway station

LI Lu1，WANG Wenbin2，XU Wen2

（1.Xuzhou Metro Co. Ltd.，Xuzhou 221000，China；

2.State Key Laboratory of High Performance Civil Engineering Materials，

Jiangsu Sobute New Materials Co. Ltd.，Nanjing 211103，China）

   Abstract：The thermal cracks were most commonly observed in sidewall of subway underground structure. The cracks mainly resulted from the dominant thermal shrinkage for the high temperature rise and fast temperature drop of concrete structure after demoulding. The HME-V concrete anti-crack agent was introduced into concrete，which could decrease the rate of cement hydration during acceleration stage and thus reduce the temperature rise and thermal shrinkage of concrete. The HME-V concrete anti-crack agent also contained expansive agent，which could produce remarkable and effective expansion to compensate the autogenous shrinkage and temperature shrinkage at later stage. By application of HME-V（temperature control and anti-seepage），no visible crack was found in sidewall of Xuzhou subway line 2（Shi Zhengfu station）.

    Key words：anti-crack，thermal crack，regulation of hydration，temperature rise of concrete，subway