养护条件对混凝土气泡特征参数的影响  

Influence of curing conditions on bubble characteristic parameters of concrete

作　　者：王俊 李翠[2] 吴昊南 李福海[3] 张立宇 卢禹成 WANG Jun;LI Cui;WU Haonan;LI Fuhai;ZHANG Liyu;LU Yucheng(Sichuan Airport Group Co.,Ltd.,Chengdu 610000,China;CCCC Highway Planning and Design Institute Co.,Ltd.,Beijing 100000,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;Chengdu Civil Air Defense Architecture Design and Research Institute,Chengdu 610000,China;Shanghai Tunnel Engineering Co.,Ltd.,Shanghai 200032,China)

机构地区：[1]四川省机场集团有限公司,四川成都610000 [2]中交公路规划设计院有限公司,北京100000 [3]西南交通大学土木工程学院,四川成都610031 [4]成都市人防建筑设计研究院,四川成都610000 [5]上海隧道工程有限公司,上海200032

出　　处：《混凝土》2023年第11期72-75,83,共5页Concrete

基　　金：国家重点研发计划课题(2021YFB2600900);四川省科技厅项目(2021YJ0545,2021JDTD0012);国家自然科学基金(U2034205)。

摘　　要：针对硬化混凝土内部气孔较多导致工程质量及耐久性较差的问题,采用单一变量原则制备了两组蒸汽养护和标准养护条件下的混凝土,试验利用混凝土气孔结构分析仪对两组混凝土不同位置的含气量、气泡间距系数、气泡比表面积等重要参数进行研究。试验结果表明:混凝土中气泡在沿高度范围稳定性较差,养护方式对混凝土不同位置的气泡有不同的影响规律;硬化初期蒸汽养护能够改善混凝土内部气泡结构,细化气泡,但对表面气泡存在负面影响,使表面气泡比表面积变小。Aiming at the problem of poor engineering quality and durability caused by many air holes in hardened concrete,two groups of concrete under steam curing and standard curing conditions are prepared by using the single variable principle.The important parameters such as air content,bubble spacing coefficient and bubble specific surface area at different positions of the two groups concrete are studied by using concrete pore structure analyzer.The results show that the stability of bubbles in concrete along the height range is poor,and the curing methods have different effects on bubbles in different positions of concrete.Steam curing at the initial stage of hardening can improve the internal bubble structure of concrete and refine bubbles,but it has a negative impact on surface bubbles and reduce the specific surface area of surface bubbles.

关 键 词：养护条件 含气量 气泡间距系数 比表面积 

分 类 号：TU528.064[建筑科学—建筑技术科学]