A STUDY ON THE QUANTITATIVE EVALUATION OF AIR PERMEABILITY OF CONCRETE
A STUDY ON THE QUANTITATIVE EVALUATION OF AIR PERMEABILITY OF CONCRETE
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混凝土透气率定量评价研究
DOI：
10.2208/jscej.1988.396_79
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发表时间：
1988
期刊：
影响因子：
--
通讯作者：
S. Nagataki
中科院分区：
文献类型：
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作者：
I. Ujike;S. Nagataki
本研究旨在探讨空气在压差作用下于混凝土内之流动行为，并定量评估混凝土之空气渗透性。采用不同的配合比和养护条件，找出影响透气性的主要因素。结果表明，空气渗透系数可以作为混凝土空气渗透性能的一个指标，并可以通过平均孔隙半径和基于蒸发水体积的孔隙率定量估算。此外，混凝土的透气性与混凝土中的毛细孔总数无关，而与干燥后的毛细孔数有关。
The objective of this study is to investigate the behavior of air flow through concrete due to a pressure difference, and to evaluate the air permeability of concrete quantitatively. Different mix proportions and curing conditions are used so as to detect the dominant factors affecting air permeability. It is found that the coefficient of air permeability can be used as an index of air permeability of concrete, and it can be quantitatively estimated by mean pore radius and porosity based on the volume of evaporated water. In addition, air permeability of concrete is found independent of the total capillary pores in concrete, but dependent on the dried capillary pores without moisture.