B05级ALC墙体热湿性能实验研究

作者:史思阳 孙金栋 张哲宁 杨云凤 姚博强 浦华勇
单位:北京建筑大学 北京金隅加气混凝土有限责任公司 中建一局集团建设发展有限公司 中建科技集团有限公司
摘要:蒸压轻质加气混凝土(ALC)的等温吸附曲线和导热系数是其热湿性能参数的重要指标。实验研究了25℃环境温度下B05级ALC的含湿率随周围环境相对湿度的变化关系,给出了等温吸附曲线及数学解析式。利用瞬态平面热源法测试了B05级ALC在不同平衡含湿率下的导热系数,拟合出实验条件下导热系数与平衡含湿率间的函数关系式。研究结果表明:ALC等温吸附曲线可由Peleg公式精确描述,其平衡含湿率增长速率随环境相对湿度增大而增大;ALC导热系数随平衡含湿率的增大呈指数型单调递增趋势,平衡含湿率越大,导热系数增长速率越快。
关键词:蒸压轻质加气混凝土ALC)墙体热湿性能等温吸附曲线导热系数含湿率
作者简介:史思阳,男,1995年生,在读硕士研究生;*孙金栋(通信作者)102616北京市大兴区黄村地区永源路15号,E-mail:sunjindong@bucea.edu.cn;
基金:国家重点研发计划项目(编号:2016YFC0701508);
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Experimental study on thermal and moisture performance of B05 grade ALC wall
Shi Siyang Sun Jindong Zhang Zhening Yang Yunfeng Yao Boqiang Pu Huayong
(Beijing University of Civil Engineering and Architecture Beijing BBMG Autoclaved Aerated Concrete Co., Ltd. China Construction First Group Construction & Development Co., Ltd. China Construction Science & Technology Group Co., Ltd.)
Abstract: The isothermal adsorption curve and thermal conductivity of autoclaved lightweight concrete(ALC) are important indicators of its thermal and moisture performance parameters. The relationship between the moisture content of B05 grade ALC and the relative humidity of the surrounding environment at an ambient temperature of 25 ℃ is studied experimentally, and the isothermal adsorption curve and mathematical analytical formula are given. The transient plane heat source method is used to test the thermal conductivity of B05 grade ALC under different equilibrium moisture content, and the functional relationship between thermal conductivity and equilibrium moisture content under the experimental conditions is fitted. The research results show that the ALC isothermal adsorption curve can be accurately described by the Peleg formula, and the growth rate of the equilibrium moisture content increases with the increase of the environmental relative humidity. The thermal conductivity of ALC shows an exponential monotonic increasing trend with the increase of the equilibrium moisture content, and the higher the equilibrium moisture content is, the faster the thermal conductivity growth rate is.
Keywords: autoclaved lightweight concrete(ALC); wall; thermal and moisture performance; isothermal adsorption curve; thermal conductivity; moisture content;
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