废旧轮胎胶粉用于填埋场衬垫材料改性,有望提高衬垫系统的有效性并扩展废旧轮胎的资源化利用途径。开展废旧轮胎胶粉–黏土混合土的内部强度和界面强度试验,探讨胶粉特征对混合土强度性质的影响规律。研究表明,随着胶粉掺入比的增加,混...废旧轮胎胶粉用于填埋场衬垫材料改性,有望提高衬垫系统的有效性并扩展废旧轮胎的资源化利用途径。开展废旧轮胎胶粉–黏土混合土的内部强度和界面强度试验,探讨胶粉特征对混合土强度性质的影响规律。研究表明,随着胶粉掺入比的增加,混合土抗剪强度有所增大,无侧限抗压强度满足规范要求。当掺入比为15%,土工膜/混合土界面强度高于土工膜/高岭土,但400 k Pa压力下表现出软化特征,残余强度低于土工膜/高岭土界面;与GCL/高岭土界面相比,GCL/混合土界面强度在法向应力较小时略小,但在法向应力较大时显著增大;界面强度小于土的内部抗剪强度。总体来看,12和30目胶粉对混合土强度的影响没有显著差异,高岭土中掺入废旧轮胎胶粉不会对内部强度和界面强度产生不利影响。展开更多
In this study the stress–strain characteristics of sand-ground rubber mixtures are investigated in the sandlike zone,at different confining pressures,using hollow cylinder specimens subjected to torsional monotonic a...In this study the stress–strain characteristics of sand-ground rubber mixtures are investigated in the sandlike zone,at different confining pressures,using hollow cylinder specimens subjected to torsional monotonic and cyclic loading.Under monotonic loading a mixture of sand-ground rubber with 10% and 25% rubber content show more contraction behaviour than that observed in a pure sand specimen.Phase transformation point in these mixtures are located on a larger shear strain.As expected,the shear strength of specimens decreases with increase of ground rubber content.However,with increasing of effective confining pressure,the loss in shear strength of the mixture is decreased.In addition,a mixture with 25% ground rubber shows a smaller loss in shear strength compared to a mixture with 10% ground rubber mixture.Under cyclic loading mixtures with 10% and 25% ground rubber have similar liquefaction resistance,especially at confining pressures of 110 k Pa and 260 k Pa.Therefore,by using of the mixture with 25% ground rubber,a larger volume of scrap tires could be recycled.The addition of ground rubber to sand would affect the shear strain variation and excess pore water pressure trends,and this effect was further intensified with increasing ground rubber percentage.展开更多
Large amounts of used rubber tires are discarded annually. A long time is needed for them to degrade naturally. This poses two major problems: environmental pollution and wastage of valuable rubber. On the other hand,...Large amounts of used rubber tires are discarded annually. A long time is needed for them to degrade naturally. This poses two major problems: environmental pollution and wastage of valuable rubber. On the other hand, with the harm of vibration and noise widely recognized, desires to control them intensify. As an important means of vibration control, viscoelastic damping technology has advanced greatly. The need for cheap and high quality viscoelastic damping materials increases rapidly. This paper made a trial to use ground rubber tire (GRT) recovered from old tires to make damping materials. The GRT is treated specially first. Then it was pressed into slabs and vulcanized. Finally, the product was cut into test samples. An Oberst beam was used to determine the loss factor βand storage modulus E. Results show that the damping materials exhibit good damping α-bility.展开更多
文摘废旧轮胎胶粉用于填埋场衬垫材料改性,有望提高衬垫系统的有效性并扩展废旧轮胎的资源化利用途径。开展废旧轮胎胶粉–黏土混合土的内部强度和界面强度试验,探讨胶粉特征对混合土强度性质的影响规律。研究表明,随着胶粉掺入比的增加,混合土抗剪强度有所增大,无侧限抗压强度满足规范要求。当掺入比为15%,土工膜/混合土界面强度高于土工膜/高岭土,但400 k Pa压力下表现出软化特征,残余强度低于土工膜/高岭土界面;与GCL/高岭土界面相比,GCL/混合土界面强度在法向应力较小时略小,但在法向应力较大时显著增大;界面强度小于土的内部抗剪强度。总体来看,12和30目胶粉对混合土强度的影响没有显著差异,高岭土中掺入废旧轮胎胶粉不会对内部强度和界面强度产生不利影响。
文摘In this study the stress–strain characteristics of sand-ground rubber mixtures are investigated in the sandlike zone,at different confining pressures,using hollow cylinder specimens subjected to torsional monotonic and cyclic loading.Under monotonic loading a mixture of sand-ground rubber with 10% and 25% rubber content show more contraction behaviour than that observed in a pure sand specimen.Phase transformation point in these mixtures are located on a larger shear strain.As expected,the shear strength of specimens decreases with increase of ground rubber content.However,with increasing of effective confining pressure,the loss in shear strength of the mixture is decreased.In addition,a mixture with 25% ground rubber shows a smaller loss in shear strength compared to a mixture with 10% ground rubber mixture.Under cyclic loading mixtures with 10% and 25% ground rubber have similar liquefaction resistance,especially at confining pressures of 110 k Pa and 260 k Pa.Therefore,by using of the mixture with 25% ground rubber,a larger volume of scrap tires could be recycled.The addition of ground rubber to sand would affect the shear strain variation and excess pore water pressure trends,and this effect was further intensified with increasing ground rubber percentage.
文摘Large amounts of used rubber tires are discarded annually. A long time is needed for them to degrade naturally. This poses two major problems: environmental pollution and wastage of valuable rubber. On the other hand, with the harm of vibration and noise widely recognized, desires to control them intensify. As an important means of vibration control, viscoelastic damping technology has advanced greatly. The need for cheap and high quality viscoelastic damping materials increases rapidly. This paper made a trial to use ground rubber tire (GRT) recovered from old tires to make damping materials. The GRT is treated specially first. Then it was pressed into slabs and vulcanized. Finally, the product was cut into test samples. An Oberst beam was used to determine the loss factor βand storage modulus E. Results show that the damping materials exhibit good damping α-bility.
