摘要
在相同实验条件下测定了稻草板和2种常用建筑调湿材料(硅藻泥及多孔无机矿物质瓷砖)的等温吸湿、放湿曲线,比较了上述3种材料调湿特性的差异性,并根据建筑材料平衡吸湿BET模型,给出3种材料平衡含湿量随相对湿度变化的拟合公式。实验中将3种样品置于不同相对湿度的环境中进行吸湿和放湿过程,间隔10 min记录样品的质量变化,测得样品在不同的湿度环境下吸放湿速率及平衡含湿量。实验结果表明:在相同的环境条件下(温湿度恒定),稻草板的平衡含湿量为硅藻泥的4~6倍,为多孔瓷砖的6~8倍;相同的环境条件下,稻草板的吸放湿速率最大,多孔瓷砖紧次之,硅藻泥的吸放湿速率最小;随着吸湿(放湿)时间增加,3种材料的吸湿(放湿)速率均呈衰减特性,但是衰减幅度及快慢不同,其中稻草板的衰减幅度最小。
The purpose of this research is to assess the hygroscopic properties of straw panels in comparison with inorganic building materials： diatomaceous earth and ceramic tiles. The sorption isotherms of three materials were established in the same experimental conditions. Meanwhile,the fitting formulas which describe the relationship between the equilibrium moisture content of three materials with indoor humidity were also presented based on the BET model. The samples of the three materials were tested in the sealed constant temperature chamber with varied relative humidity（RH） values ranging from 10% RH to 90% RH,and the mass of samples were logged at a tenminute interval in order to measure the absorption/desorption rate. The results showed that straw panels could uptake and release 4 or 6 times moisture as much as diatomaceous wall could,and 6 or 8 times as much as ceramic tiles could at the same environment. The absorption/desorption rate of straw panels is the largest among the three materials in the same environment. In addition,the absorption/desorption rate decreases in function of power along with the increase of sorption time,but different materials present different amplitudes and speeds of attenuation.
出处
《建筑科学》
CSCD
北大核心
2017年第2期42-46,共5页
Building Science
基金
国家自然科学青年基金"调湿建材在湿驱动势下对围护结构与室内热湿分布的影响"(51308333)
中建股份科技课题城市地下空间环境控制关键技术研究(CSCEC-2014-Z-1-2)
关键词
稻草板
吸放湿性能
对比研究
实验
straw panels
hygroscopic properties
comparative study
experiment
