不同抗裂材料在隧道大体积混凝土侧墙中的应用  

The Application of Different Anti-crack Materials in Mass Concrete Side Wall of Tunnel

作　　者：周清松 徐可 方博 徐智丹 

机构地区：[1]武汉三源特种建材有限责任公司,湖北武汉430083

出　　处：《混凝土世界》2022年第11期36-41,共6页China Concrete

摘　　要：混凝土开裂是整个建筑行业的难点,特别是大体积混凝土,开裂现象更严重。为降低裂缝的产生几率,现阶段大体积混凝土经常会添加抗裂材料。为探索不同抗裂材料在大体积混凝土中的应用效果,本文以湖北襄阳某隧道项目为例,通过抗裂模拟计算分析开裂的几率,然后将3种不同抗裂材料应用于大体积侧壁混凝土中,借此探索更适合大体积混凝土的抗裂材料,试验结果表明,氧化镁膨胀剂在补偿混凝土长龄期收缩变形以及温降收缩方面有其独特的技术优势。Concrete cracking is a difficult point in the whole construction industry,especially for large volume concrete.In order to reduce the probability of cracks,crack resistant materials are often added to mass concrete at this stage.In order to explore the application effect of different crack resistant materials in mass concrete,this paper takes a tunnel project in Xiangyang,Hubei Province as an example,analyzes the probability of cracking through crack resistance simulation calculation,and then applies three different crack resistant materials to the mass sidewall concrete to explore the crack resistant materials more suitable for mass concrete.The test results show that,Magnesia expansive agent has its unique technical advantages in compensating long-term shrinkage deformation and temperature drop shrinkage of concrete.

关 键 词：抗裂 大体积 收缩 抗裂模拟计算 膨胀剂 

分 类 号：U454[建筑科学—桥梁与隧道工程]