摘要
采用干燥剂法、70℃烘干法和105℃烘干法处理了2种尺寸（4cm×4cm×2cm和3cm×3cm×1cm）的加气混凝土试件，比较了3种干燥方法得到的试件干重差异．用静态称重法测定了70℃烘干的大小试件在不同相对湿度下的平衡含湿量，并用统计学方法进行比较，然后采用Peleg模型拟合了加气混凝土等温吸湿曲线．结果表明：70℃烘干法得到的试件干重比干燥剂法得到的试件干重多0．13％～0．16％，而105℃烘干法得到的试件干重比干燥剂法得到的试件干重少1．02％～1．06％．大小加气混凝土试件在相同相对湿度下的平衡含湿量并不相等，在中高相对湿度下小试件的平衡含湿量明显较小．不同干燥条件下大小加气混凝土试件拟合等温吸湿曲线有明显差异．在测试加气混凝土等温吸湿曲线时，推荐采用70℃烘干大试件．
Aerated concrete samples of two sizes（4 cm×4 cm×2 cmand 3 cm×3 cm×1 cm） were dried with desiccant at room temperature and with oven at 70 ℃ and 105 ℃ respectively. The dry masses ob- tained from different drying methods were compared. Static gravimetric method was used to obtain the e- quilibrium moisture contents in samples dried in oven at 70 ℃ in different relative humidities, and a statis- tical comparison was made. Peleg model was used to fit the moisture absorption isotherms of aerated con- crete. Results reveal that the dry mass obtained from oven drying method at 70℃ is 0.13%-0.16% grea- ter than that obtained from desiccant drying method at room temperature, while oven drying method at 105 ℃ gives 1.02%- 1.06% smaller dry mass. Moreover, the equilibrium moisture contents in samples of different sizes under the same relative humidity are not the same. In middle-high relative humidity range, the equilibrium moisture contents in smaller samples are noticeably less. The fitted moisture absorption i- sotherms of samples with different sizes and drying methods are noticeably different. The one for bigger sample dried in oven at 70 ℃ is recommended as the moisture absorption isotherm of aerated concrete.
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2014年第1期132-137,142,共7页
Journal of Building Materials
基金
"十二五"国家科技支撑计划项目(2011BAJ01B01)
关键词
加气混凝土
干燥方法
试件尺寸
干重
平衡含湿量
等温吸湿曲线
aerated concrete
drying method
sample size
dry mass
equilibrium moisture content
mois-ture absorption isotherm
