球体吸收法测量建筑材料水蒸气扩散系数的研究

doi:10.3969/j.issn.1000-1158.2019.05.13

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Abstract An experimental approach was built for measuring the diffusion coefficient of water vapor by a spherical absorption method, taking the typical porous building material aerated concrete as an example. Meanwhile, through uncertainty analysis and method verification, the feasibility and accuracy for measuring the water vapor diffusion coefficient of building materials were investigated. It is concluded that the spherical absorption method is suitable for measuring the water vapor diffusion coefficient of porous building materials and it has the advantages of short time and accurate results. For aerated concrete, the half-time method is more accurate than transient techniques in calculating water vapor diffusion coefficient. The water vapor diffusion coefficient of aerated concrete gradually increases between 45% and 80% relative humidity. While at higher humidity, water vapor diffusion coefficient gradually decreases due to the appearance of liquid water.

Key words： metrology water vapor diffusion coefficients aerated concrete spherical absorption method measurement uncertainty

Received: 31 May 2018 Published: 01 September 2019

PACS:

TB94

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	Articles by authors
	WANG You-hui
	TIAN Shuai-qi
	MA Meng-chen
	WANG Shi-yin
	XU Xu
	FAN Li-wu
	YU Zi-tao

Cite this article:

WANG You-hui,TIAN Shuai-qi,MA Meng-chen, et al. Study on Measurement of Water Vapor Diffusion Coefficient of Building Materials by Spherical Absorption Method[J]. Acta Metrologica Sinica, 2019, 40(5): 816-822.

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http://jlxb.china-csm.org:81/Jwk_jlxb/EN/10.3969/j.issn.1000-1158.2019.05.13 OR http://jlxb.china-csm.org:81/Jwk_jlxb/EN/Y2019/V40/I5/816

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