This study was designed to assess the possibility of tailoring waste papers and wood dust into composite materials with plaster of Paris (P.O.P) and also determine the suitability of using the developed composites as ceiling panels in building construction. Assorted un-used papers collected as waste materials were processed into waste paper ash (WPA) which was then after utilized like untreated wood dust (UWD) and treated wood dust (TWD) as filler materials to separately, but at similar volumetric proportions, fabricate test samples with P.O.P as matrix. Static angle of repose and major chemical constituents of the fillers were determined. The results of the tests performed on the samples revealed that increase in the proportion of each filler material resulted to decrease in bulk density, thermal conductivity, thermal diffusivity, and flexural strength but increase in percentage water absorption, specific heat capacity, thermal resistance, heat penetration time, and flaking concentration. Sample developed with 36.7 % of the WPA and the one containing 25.0 % of the TWD exhibited impressive performance ability similar to sample fabricated with 18.3 % of the UWD. Though the most significant improvement in thermal insulating ability over the pure P.O.P sample was observed in the case of samples developed with the UWD, it was found that the proportion of each filler material incorporated into the P.O.P matrix can be adjusted to achieve optimum performance desired of the resulting composite panel during its usage as a ceiling in building. From technical–economic point of view, utilizing waste papers and wood dust as raw materials in the production of new and value-added engineering materials, as in the present study, is a promising possibility of reducing the cost of P.O.P for enhancement of affordable housing, thereby meeting the needs of end-users and also ensure minimization of health hazards associated with paper and wood dust wastes.

中文翻译：

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用熟石膏制作的建筑保温复合板的热性能和强度性能研究

本研究旨在评估用熟石膏 (POP) 将废纸和木屑剪裁成复合材料的可能性，并确定将开发的复合材料用作建筑施工中的天花板的适用性。作为废料收集的各种未使用的纸张被加工成废纸灰 (WPA)，然后像未经处理的木屑 (UWD) 和处理过的木屑 (TWD) 一样作为填充材料单独使用，但以相似的体积比例制造以POP为基质的测试样品。测定了填料的静态休止角和主要化学成分。对样品进行的测试结果表明，每种填充材料比例的增加导致堆积密度、热导率、热扩散率、和弯曲强度，但吸水率、比热容、耐热性、热渗透时间和剥落浓度增加。用 36.7% 的 WPA 开发的样品和含有 25.0% TWD 的样品表现出令人印象深刻的性能，类似于用 18.3% 的 UWD 制造的样品。尽管在使用 UWD 开发的样品的情况下观察到与纯 POP 样品相比，隔热能力的最显着改进，但发现可以调整掺入 POP 基体的每种填充材料的比例，以实现所需的最佳性能在用作建筑天花板时产生的复合板。从技术经济角度来看，