混凝土中气泡的产生与发展:机理和影响因素

材料导报

2021, Vol. 35

Issue (z2): 213-217

无机非金属及其复合材料

混凝土中气泡的产生与发展:机理和影响因素

罗祥, 王玲, 王振地

中国建筑材料科学研究总院有限公司,绿色建筑材料国家重点实验室,北京 100024

Mechanism and Influencing Factors of Bubble Generation and Evolution in Concrete

LUO Xiang, WANG Ling, WANG Zhendi

State Key Laboratory of Green Building Materials, China Building Materials Academy, Beijing 100024, China

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摘要搅拌和引气剂作用引入混凝土中的气泡可增加新拌混凝土的工作性,提升硬化混凝土抗冻耐久性且不显著影响混凝土强度。在混凝土搅拌、运输、浇筑、振捣和养护过程中,气泡处于动态变化,直至混凝土硬化后成为孔隙结构的一部分。新拌混凝土作为流体,其中的气泡行为一定程度上和水溶液中气泡行为类似,区别在于混凝土是固液气三相混合体系和水泥水化过程的影响。近年来研究者们开展了大量环境因素、混凝土组成和施工工艺影响气泡行为的实验和理论研究工作,探究了砂浆和混凝土中气泡液膜吸附固体颗粒形成固体外壳的特性及水泥水化过程对气泡产生与发展的影响。本文归纳了气泡产生、生长、稳定与失稳破裂四个阶段的机理研究进展,介绍了环境温度、环境气压、组成和施工工艺四个因素对气泡的影响,分析了混凝土气泡研究在实验方法和理论模型方面面临的问题并展望其前景。

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	罗祥
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关键词: 气泡孔隙气泡产生稳定性引气剂温度

Abstract: An improvement in the working performance of fresh concrete and the durability of hardened concrete can be achieved by air-filled voids introduced by stirring process and air-entraining agents, which will not significantly decline the strength of hardened concrete. In the process of concrete mixing, transportation, pouring, vibration and curing, bubbles in fresh concrete are constantly changing until concrete hardens and some bubbles become a part of the pore structure. The behavior of bubbles in fresh concrete resembles the one in aqueous solution. However, the multiphase (including gas, liquid and solid) and cement hydration process are distinctions between concrete and aqueous solution. This urges intensive research endeavors to figure out the properties of air-void shells in fresh cement paste and how cement hydration process influences bubble generation and evolution. And in recent years, impressive strides have been made in understanding the influence of environmental factors, concrete composition and construction process on bubble stability in fresh concrete. This review offers a retrospection of the research efforts with respect to the mechanism of generation, growth, stability, and instability of bubbles, and provides elaborate descriptions about the influence of temperature, atmospheric pressure, concrete composition and construction technology on bubbles. We then pay attention to the problems confronting the experimental method and theoretical model and discuss further research on concrete bubbles.

Key words: bubble air void bubble generation stability air-entraining agent temperature

发布日期: 2021-12-09

ZTFLH:

TU528

基金资助: 国家重点研发计划(2017YFB0309903)

通讯作者: wangling@cbmamail.com.cn

作者简介: 罗祥,2019年7月毕业于清华大学土木工程系,获得工学学士学位。现为中国建筑材料科学研究总院硕士研究生,在王玲教授的指导下进行研究。目前主要研究领域为混凝土耐久性。
王玲,教授级高工,中国建材联合会混凝土外加剂分会秘书长,中国土木学会混凝土耐久性专业委员会副主任委员,全国混凝土标准化技术委员会副秘书长。自1993年起,从事混凝土外加剂和混凝土耐久性的研究与技术开发工作。完成10余项国家科技攻关、自然科学基金和973基础研究项目,在混凝土碱-骨料反应、高强高性能混凝土收缩开裂、混凝土外加剂、原材料对混凝土体积变化和裂缝形成的影响机理及控制技术、高性能道路水泥混凝土路面关键技术、无砟轨道结构混凝土材料、多因素协同作用下钢筋混凝土耐久性等方面取得了大量研究成果。发表论文70多篇,专著3本;获得授权专利近30项;主编和参编了10余项混凝土及外加剂标准。2006年荣获中国硅酸盐学会第六届青年科技奖,2013年荣获首届吴中伟青年科技奖。获省部级科技奖励7项。

引用本文:

罗祥, 王玲, 王振地. 混凝土中气泡的产生与发展:机理和影响因素[J]. 材料导报, 2021, 35(z2): 213-217.
LUO Xiang, WANG Ling, WANG Zhendi. Mechanism and Influencing Factors of Bubble Generation and Evolution in Concrete. Materials Reports, 2021, 35(z2): 213-217.

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http://www.mater-rep.com/CN/ 或 http://www.mater-rep.com/CN/Y2021/V35/Iz2/213

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