粉煤灰混凝土透水性在实验室环境和现场环境中的时间依赖性和相似性

IF 1.6 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY Journal of Advanced Concrete Technology Pub Date : 2024-04-19 DOI:10.3151/jact.22.219
Junzhi Zhang, Libin Zhou, Yucheng He, Yurong Zhang
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引用次数: 0

摘要

研究了粉煤灰(FA)含量和环境因素对透水性的影响,并讨论了现场和实验室环境下随时间变化的透水系数的相似关系。同时,采用核磁共振方法分析了主要的微观结构参数及其随时间变化的特征。最后,分析了两种环境下透水性与孔隙率之间的相关性。结果表明,在两种环境下,FA 混凝土的透水系数都随着暴露时间的延长而降低。FA 能有效改善混凝土的抗渗水性,在暴露后期,改善效果随 FA 含量的增加而增强。实验室环境加速了透水性和孔隙率的降低。但在后期,降低程度不如现场环境。FA 混凝土中的孔隙以 10 至 100 nm 的孔隙为主,直径大于等于 100 nm 的有害孔隙所占比例随着暴露时间的延长而减少。实验室暴露 520 天的混凝土的透水系数和孔隙率与现场暴露 800 至 1000 天的混凝土的透水系数和孔隙率接近,在两种环境下均表现出良好的时间相关性,且与暴露时间的相关性强于与 FA 含量的相关性。
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Time Dependency and Similarity of Water Permeability of Fly Ash Concrete Between Laboratory Environment and Site Environment

Effects of fly ash (FA) content and environmental factors on the water permeability were studied, and the similarity relationship of time-dependent water permeability coefficient in site and laboratory environment was discussed. Meanwhile, the main microstructure parameters and their time-dependent characteristics were analyzed by the NMR method. Finally, the correlation between water permeability and porosity in two environments was analyzed. Results show that water permeability coefficient of FA concrete both decreased with exposure time in two environments. FA can effectively improve the water impermeability, and the improvement effect increased with FA content in the later exposure period. Laboratory environment accelerated the decrease of water permeability and porosity. However, in the later stage, the decrease degree was not as good as that in the site environment. Pores with size of 10 to 100 nm occupy the main part of pores in FA concrete and the proportion of harmful pores of diameter 100 nm or larger decreased with exposure time. The water permeability coefficient and porosity of concrete exposed for 520 days in laboratory are close to that exposed for 800 to 1000 days in site, showing a good time dependent correlation in both environments, and the correlation with exposure time is stronger than that considering FA content.

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来源期刊
Journal of Advanced Concrete Technology
Journal of Advanced Concrete Technology 工程技术-材料科学:综合
CiteScore
3.70
自引率
10.00%
发文量
45
审稿时长
3.5 months
期刊介绍: JACT is fast. Only 5 to 7 months from submission to publishing thanks to electronic file exchange between you, the reviewers and the editors. JACT is high quality. Peer-reviewed by internationally renowned experts who return review comments to ensure the highest possible quality. JACT is transparent. The status of your manuscript from submission to publishing can be viewed on our website, greatly reducing the frustration of being kept in the dark, possibly for over a year in the case of some journals. JACT is cost-effective. Submission and subscription are free of charge . Full-text PDF files are available for the authors to open at their web sites. Scope: *Materials: -Material properties -Fresh concrete -Hardened concrete -High performance concrete -Development of new materials -Fiber reinforcement *Maintenance and Rehabilitation: -Durability and repair -Strengthening/Rehabilitation -LCC for concrete structures -Environmant conscious materials *Structures: -Design and construction of RC and PC Structures -Seismic design -Safety against environmental disasters -Failure mechanism and non-linear analysis/modeling -Composite and mixed structures *Other: -Monitoring -Aesthetics of concrete structures -Other concrete related topics
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