摘要
本文用X射线衰减法非破坏性地测得了混凝土在毛细吸水过程中的瞬态含湿量分布,并采用玻尔兹曼变换处理了原始数据,最终得到了混凝土的液态水扩散系数。误差分析表明,当含湿量大于30 kg/m^3时,本文结果与IEA Annex 14结果的相对差异为4.5%;当含湿量低于30 kg/m^3时,相对差异为12%。考虑到材料差异、实验误差以及IEA Annex 14数据的不确定性,可以认为本文的测试结果可靠。本文还对陶瓷砖和石灰砂浆进行了测试,证明该方法可推广至其它多孔建筑材料。
The X-ray attenuation method was applied to non-destructively obtain the transient moisture profiles in concrete during capillary absorption.Boltzmann transform was adopted to determine the liquid diffusivity of concrete.The results were compared with data from the IEA Annex 14 project,showing a relative deviation of 4.5% for moisture content greater than 30 kg/m^3 and a relative deviation of 12% for moisture content below 30 kg/m^3.The findings were proven reliable when material inhomogeneity,experimental errors and uncertainties from IEA Annex 14 were considered together.Ceramic brick and lime mortar were also tested by the method above,demonstrating that it is also applicable to other porous building materials.
作者
冯驰
FENG Chi(Key Laboratory of New Technology for Construction of Cities in Mountain Area,Ministry of Education,Chongqing University,Chongqing 400045;School of Architecture and Urban Planning,Chongqing University,Chongqing 400045)
出处
《建筑科学》
CSCD
北大核心
2020年第12期140-144,共5页
Building Science
基金
山地城镇建设与新技术教育部重点实验室开放课题“外墙憎水处理对湿热地区住宅室内热湿环境的影响”(LNTCCMA-20200108)。
关键词
多孔建筑材料
液态水扩散系数
毛细吸水
X射线衰减
含湿量分布
玻尔兹曼变换
porous building material
liquid diffusivity
capillary absorption
X-ray attenuation
moisture content distribution
Boltzmann transform
