期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 228, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2019.116815
关键词
External thermal insulation composite system (ETICS); NMR technique; Pores structure; Structural layer; Moisture transport
资金
- Zhejiang Provincial Natural Science Foundation of China [LGF18E080010]
- Primary Research and Development Plan of Zhejiang Province [2019C03120]
- Nanhu college of Jiaxing University School -class Key Topics of Funded Projects [N41472001-50]
- National College Students Innovation and Entrepreneurship Training Program [201810354012]
In order to study the pore structure characteristics of the deteriorated structural layer of an external thermal insulation composite system (ETICS), the overall and stratified T-2 spectrum signals of the system made of thin-layer inorganic insulation mortar are tested by nuclear magnetic resonance (NMR) technique under different moisture transport conditions. The variation in moisture transport with pore size in the structural layer of the ETICS is studied under three conditions, namely, vacuum-saturation, free water absorption and vapor adsorption process, and indices are proposed to evaluate the vapor adsorption and free water absorption capacity of ETICS. The results indicate that the total pore volume is predominated by the pores in the insulation layer as revealed by the peaks of T-2 spectrum, which exhibit a bi-modal distribution with some larger pores. The pores in the finishing coat, protective layer and bonding layer have negligibly smaller size and smaller volume as revealed by a lower T-2 peak and an indistinct second peak. The moisture transport patterns of pores with different sizes are quite different. Vapor adsorption mainly occurs in pores of size smaller than 0.1 mu m and free water absorption mainly occurs in pores of size smaller than 10 mu m. (C) 2019 Elsevier Ltd. All rights reserved.
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