预制梁外观质量缺陷形成机理及控制对策  

Research on the Causes of Appearance Quality Defects and Control Countermeasures for Precast Girder

作　　者：陈甫君 于建华 史文琰 朱云升[2] 王开凤[2] CHEN Fujun;YU Jianhua;SHI Wenyan;ZHU Yunsheng;WANG Kaifeng(Sichuan Transportation Construction Group Co.,Ltd,Chengdu 610047,China;School of Transportation and Logistics Engineering,Wuhan University of Technology,Wuhan 430063,China)

机构地区：[1]四川省交通建设集团有限责任公司,成都610000 [2]武汉理工大学交通与物流工程学院,武汉430063

出　　处：《交通科技》2024年第5期105-110,共6页Transportation Science & Technology

摘　　要：为提升预制梁外观质量,对预制梁清水镜面混凝土出现的外观质量缺陷进行分类,利用扫描电镜(SEM)和X-射线衍射(XRD)等微观试验手段观察水化产物差异,分析各类缺陷形成机理,从水泥水化产物及浇筑工艺等方面提出有效控制混凝土外观质量缺陷的改良措施。结果表明,水化产物、混凝土含气量及工作性能差异是造成预制梁各类外观质量缺陷的主要原因,提出数字化、智能化混凝土原材料、施工工艺控制对策,使不合格外观质量预制梁数量减少72.7%,优秀和良好外观质量预制梁数量增加62.5%,有效提升预制梁的外观质量,实现高品质工程的建设目标。In order to improve the appearance quality of the precast box girder,the appearance quality defects of prefabricated box girder with clear mirror concrete were classified,the differences of hydration products were observed by scanning electron microscopy(SEM)and X-ray diffraction(XRD)and other microscopic test methods,the formation mechanism of various defects was analyzed,and improvement measures to effectively control the appearance quality defects of concrete were proposed from the aspects of cement hydration products and pouring process,etc.The results show that the differences of hydration products,concrete gas content and working performance are the main causes of various appearance quality defects of precast box girder.The digital and intelligent concrete raw materials and construction technology control measures are put forward to reduce the number of precast box girder with unqualified appearance quality by 72.7%,and increase the number of precast box girder with excellent and good appearance quality by 62.5%,effectively improving the appearance quality of precast box girder and achieving the goal of high quality project construction.

关 键 词：预制梁 外观质量 水化产物 缺陷机理 

分 类 号：U443.35[建筑科学—桥梁与隧道工程]