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Thermal and acoustic characteristics of novel thermal insulating materials made of Eucalyptus Globulus leaves and wheat straw fibers
Journal of Building Engineering ( IF 6.4 ) Pub Date : 2020-05-08 , DOI: 10.1016/j.jobe.2020.101452
M. Ali , A. Alabdulkarem , A. Nuhait , K. Al-Salem , G. Iannace , R. Almuzaiqer , A. Al-turki , F. Al-Ajlan , Y. Al-Mosabi , A. Al-Sulaimi

A novel research about using dried Eucalyptus Globulus leaves (EGL) as a biodegradable natural thermal insulating and sound absorbing material for building walls is presented. The EGL is used as leaves alone or hybrid with wheat straw fibers. Cornstarch is used as a binder for the leaves or for the hybrid specimens. Two bound specimens are made; one used leaves alone with the binder and the other used wheat straw alone. Four more hybrid specimens are made with different densities and compositions. Thermal conductivity coefficients are determined at different temperatures for all specimens. In addition to that, sound absorbing coefficient and three bending moment tests are obtained for the bound specimens. Scanning electron microscopy (SEM), Fourier transformation Infra red (FT-IR) spectral analysis, Thermo-gravimetric analysis, differential scanning calorimetry and moisture content are conducted for the leaves. Results show that the average thermal conductivity of the dried leaves is in the range 0.045–0.055 W/mK for a temperature range from 10 to 60 °C, respectively and the upper value of the hybrid specimens is about 0.065 W/mK at the maximum temperature of 60 °C. Sound absorbing coefficient has values greater than 0.5 in the range of frequency between 500 to 1600 Hz for most specimens. Thermo-gravimetric analysis shows that the leaves are stable up to 210 °C and the moisture content of the leaves is 16% at the environment conditions of Riyadh. These results ensure the promising effect of using Eucalyptus Globulus leaves as a new thermal insulating and sound absorbing material for buildings which have low environmental impact by using renewable natural resources for thermal insulation in buildings rather than the synthetic insulation materials.



中文翻译:

由桉树叶和麦草纤维制成的新型保温材料的热和声特性

提出了关于使用干燥的桉树叶(EGL)作为可生物降解的天然隔热和吸声材料用于建筑墙体的新研究。EGL可以单独用作叶,也可以与麦草纤维混合使用。玉米淀粉用作树叶或杂种标本的粘合剂。制作两个装订的标本。一个单独使用带有粘合剂的叶子,另一个单独使用小麦秸秆。制作了另外四个具有不同密度和成分的混合标本。确定所有样品在不同温度下的导热系数。除此之外,还对绑定的样品进行了吸声系数和三个弯矩测试。扫描电子显微镜(SEM),傅立叶变换红外(FT-IR)光谱分析,热重分析,对叶片进行差示扫描量热法和水分含量测定。结果表明,在10至60°C的温度范围内,干燥叶片的平均热导率分别在0.045–0.055 W / mK的范围内,并且混合样本的最大值最大约为0.065 W / mK。温度为60°C。对于大多数样品,吸声系数的值在500到1600 Hz之间的频率范围内大于0.5。热重分析表明,在利雅得的环境条件下,叶片在高达210°C的温度下稳定,叶片的水分含量为16%。

更新日期:2020-05-08
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