内养生桥面铺装混凝土抗早期塑性开裂性能  

Anti-Early Plastic Cracking Properties of Concrete Bridge Deck Pavement with Internal Curing

作　　者：谢政专 周胜波 韦万峰 刘卫东 焦晓东 王彬 XIE Zhengzhuan;ZHOU Shengbo;WEI Wanfeng;LIU Weidong;JIAO Xiaodong;WANG Bin(Guangxi Key Laboratory of Road Structure and Materials,Research and Development Center on Technologies,Materials and Equipment of High Grade Highway Construction and Maintenance Ministry of Transport of China,Nanning 530007,China;Guangxi Transportation Science and Technology Group Co.,Ltd.,Nanning 530007,China)

机构地区：[1]高等级公路建设与养护技术、材料及装备运输行业研发中心,广西道路材料与结构重点实验室,南宁530007 [2]广西交科集团有限公司,南宁530007

出　　处：《硅酸盐通报》2020年第12期3837-3843,共7页Bulletin of the Chinese Ceramic Society

基　　金：广西科技计划项目广西重点研发计划(桂科AB17292032);广西自然科学基金面上项目(2018GXNSFAA281339);广西重点研发计划(桂科AB19259008);南宁市科学技术局项目(20183044-1)。

摘　　要：为改善桥面铺装混凝土抗早期塑性开裂性能,通过平板约束法和现场桥面铺装实体工程研究了内养生材料对混凝土抗早期塑性开裂性能的影响。试验结果表明,内养生材料可以有效延缓混凝土的早期开裂,且随着内养生材料掺量的增加,混凝土抗早期塑性开裂性能越好;当内养生材料掺量为0.2%(质量分数)时,平板约束法下的混凝土单位开裂面积由1219 mm 2/m 2降低到47 mm 2/m 2。在实体工程应用中,同普通混凝土相比,0.2%掺量的桥面铺装混凝土单位面积裂缝条数、最大长度、最大宽度以及开裂面积分别同比下降了91.7%、55.8%、37.5%、90.7%,说明内养生材料可以显著提升桥面铺装混凝土抗早期塑性开裂的性能。In order to improve the anti-early plastic cracking properties of concrete bridge deck pavement.Influence of internal curing materials on the anti-early plastic cracking properties of concrete was investigated with slab restraint method and on-site entity engineering of bridge deck pavement.The results indicate that internal curing materials effectively delay the early cracking of concrete,and the anti-early plastic cracking properties of concrete are improved with the increase of the content of internal curing materials.When the content of internal curing materials is 0.2%(mass fraction),the unit cracking area of concrete decreases from 1219 mm 2/m 2 to 47 mm 2/m 2 through the slab restraint method.Compared with ordinary concrete,the number of cracks,maximum length,maximum width,and cracked area per unit area decrease by 91.7%,55.8%,37.5%,90.7%with 0.2%internal curing materials,the internal curing materials significantly improve the anti-early plastic cracking properties of concrete bridge deck pavement.

关 键 词：桥面铺装混凝土 早期收缩 塑性开裂 内养生材料 

分 类 号：TU528.37[建筑科学—建筑技术科学]