Design of a steady-state in situ test to determine the air permeability coefficient of covercrete
作者： Kai Yang , Yaocheng Wang , Adrian Long , Changhui Yang , Song Mu
DOI: 10.1016/J.CONBUILDMAT.2018.10.200
关键词: Test method 、 Air permeability specific surface 、 Steady state (electronics) 、 Mechanics 、 Computer simulation 、 Flownet 、 Airflow 、 Calibration 、 Head (vessel) 、 Materials science
摘要: Abstract An in situ air permeability test method that does not require assumptions for the often-difficult unidirectional flow has been developed to calculate coefficient of near surface concrete. The proposed involves applying a constant pressure head mounted ring and measuring steady state rates. analysis is based on modification flownet theory, which needs calibration factor accounting influence specimen geometries. Effects area, width seal, depth were investigated using numerical simulation flow. repeatability was assessed by signal noise ratio (SNR) discrimination (DR). A new formula offered it only requires rate permeability, thus assisting engineers researchers quickly determine this property structural concretes.
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