| 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102%~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. |
| 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 |
| DOI：103969/j.issn1007 9629201401024 |
| 分类号: |
| 基金项目:“十二五”国家科技支撑计划项目（2011BAJ01B01） |
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| Effect of Drying Methods and Sample Sizes on Moisture Absorption Isotherms of Aerated Concrete |
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FENG Chi1, WU Chenchen1, FENG Ya2, MENG Qinglin1
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1.State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, China;2.China Southwest Architectural Design and Research Institute Corp., Ltd., Chengdu 610041, China
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| Abstract: |
| Aerated concrete samples of two sizes(4cm×4cm×2cmand 3cm×3cm×1cm) were dried with desiccant at room temperature and with oven at 70℃ and 105℃ respectively. The dry masses obtained from different drying methods were compared. Static gravimetric method was used to obtain the equilibrium moisture contents in samples dried in oven at 70℃ in different relative humidities, and a statistical comparison was made. Peleg model was used to fit the moisture absorption isotherms of aerated concrete. Results reveal that the dry mass obtained from oven drying method at 70℃ is 0.13%0.16% greater than that obtained from desiccant drying method at room temperature, while oven drying method at 105℃ gives 102%106% 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 isotherms 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. |
| Key words: aerated concrete drying method sample size dry mass equilibrium moisture content moisture absorption isotherm |
