Structures erected on swelling clay soils are subjected to several stresses which are at the origin of the premature deterioration of the infrastructures. The soils being supports for the works, the improvement of the...Structures erected on swelling clay soils are subjected to several stresses which are at the origin of the premature deterioration of the infrastructures. The soils being supports for the works, the improvement of their weak characteristics with cotton fibers will not only increase the bearing capacities of these soils and the resolution of the environmental problem, by eliminating the CO<sub>2</sub> produced by the burning of the stems after harvest. The objective of this study is to contribute to the improvement of the characteristics by cotton stalk powder of the swelling clay soils used as the foundation of the infrastructures in order to guarantee their durability. Identification and mechanical parameterization tests were carried out on raw soil samples taken at 1.5 meters deep and on samples improved with cotton stalk powder at different levels (3%, 6% and 10%). The results from the physical tests reveal that the soil studied is very plastic silt. As for the mechanical tests, it appears that by adding 3% cotton stalk powder to dry density which goes from 1.435 t/m<sup>3</sup> compared to the control sample with a dry density of 1.50 t/m<sup>3</sup>;which reflects an improvement in the compaction characteristics of the soil studied. The dry densities are 1.445 t/m<sup>3</sup> and 1.29 t/m<sup>3</sup> for the samples improved with 6% and 10% cotton stalk powder.展开更多
以廉价的棉花秸秆和高密度聚乙烯(HDPE)为原料,通过高温炭化和热压成型两种较为简单的工艺,制备了棉花秸秆炭HDPE复合材料。结果表明,当炭的质量分数上升至60%时,复合材料的电磁屏蔽效能大于10 d B。添加少量金属粉末,电磁屏蔽效能有较...以廉价的棉花秸秆和高密度聚乙烯(HDPE)为原料,通过高温炭化和热压成型两种较为简单的工艺,制备了棉花秸秆炭HDPE复合材料。结果表明,当炭的质量分数上升至60%时,复合材料的电磁屏蔽效能大于10 d B。添加少量金属粉末,电磁屏蔽效能有较大幅度提升。其中,添加铁粉的复合材料电磁屏蔽效能最佳。炭的质量分数为40%时,添加铁粉的质量分数为5%,电磁屏蔽效能从4 d B提高到11 d B,吸波效能从3 d B提高到8 d B。随着添加金属质量的增加,复合材料的电磁屏蔽效能吸波效能逐渐增强。分析可知,当采用金属粉末作为添加剂时,选择密度较小且有较好磁性的金属,电磁屏蔽效能和吸波效能更佳。展开更多
文摘Structures erected on swelling clay soils are subjected to several stresses which are at the origin of the premature deterioration of the infrastructures. The soils being supports for the works, the improvement of their weak characteristics with cotton fibers will not only increase the bearing capacities of these soils and the resolution of the environmental problem, by eliminating the CO<sub>2</sub> produced by the burning of the stems after harvest. The objective of this study is to contribute to the improvement of the characteristics by cotton stalk powder of the swelling clay soils used as the foundation of the infrastructures in order to guarantee their durability. Identification and mechanical parameterization tests were carried out on raw soil samples taken at 1.5 meters deep and on samples improved with cotton stalk powder at different levels (3%, 6% and 10%). The results from the physical tests reveal that the soil studied is very plastic silt. As for the mechanical tests, it appears that by adding 3% cotton stalk powder to dry density which goes from 1.435 t/m<sup>3</sup> compared to the control sample with a dry density of 1.50 t/m<sup>3</sup>;which reflects an improvement in the compaction characteristics of the soil studied. The dry densities are 1.445 t/m<sup>3</sup> and 1.29 t/m<sup>3</sup> for the samples improved with 6% and 10% cotton stalk powder.
文摘以廉价的棉花秸秆和高密度聚乙烯(HDPE)为原料,通过高温炭化和热压成型两种较为简单的工艺,制备了棉花秸秆炭HDPE复合材料。结果表明,当炭的质量分数上升至60%时,复合材料的电磁屏蔽效能大于10 d B。添加少量金属粉末,电磁屏蔽效能有较大幅度提升。其中,添加铁粉的复合材料电磁屏蔽效能最佳。炭的质量分数为40%时,添加铁粉的质量分数为5%,电磁屏蔽效能从4 d B提高到11 d B,吸波效能从3 d B提高到8 d B。随着添加金属质量的增加,复合材料的电磁屏蔽效能吸波效能逐渐增强。分析可知,当采用金属粉末作为添加剂时,选择密度较小且有较好磁性的金属,电磁屏蔽效能和吸波效能更佳。
