轻质高效能木质沥青混合料的弹性降噪性能

Elastic and noise reduction performance of light weight and high efficacy wood bituminous mixtures

为研究木质沥青混合料的性能优势,采用应力、应变、泊松比和比强度对木质沥青混合料与石质沥青混合料进行了力学性能比较;利用GB反弹系数和吸声系数,对木质沥青混合料和石质沥青混合料的弹性性能和降噪性能进行了比较。结果表明:木质沥青混合料的应力-应变曲线平缓,呈柔性破坏,且泊松比高出石质沥青混合料60%～80%,抗压比强度和劈裂比强度与石质混合料相比高出10%～20%;木质沥青混合料的GB反弹系数为石质沥青混合料的1/9～1/2,表明木质沥青混合料具有更加优异的弹性恢复能力;木质沥青混合料的吸声系数超过石质沥青混合料1倍以上,表现出良好的吸声性能。

To study the advantages of wood bituminous mixtures performance, the strain, stress, Poisson＇s ratio, and specific strength were used to evaluate the mechanical properties of wood bituminous mixtures and stone bituminous mixtures. Meanwhile, GB rebounding coefficient and absorption coefficient of wood bituminous mixtures were investigated and compared with stone bi- tuminous mixtures in elastic properties and noise reduction performance. The results show that the stress-strain curve of wood bituminous mixtures is gentle and exhibits flexible failure. The Poisson＇s ratio and specific strength of wood bituminous mixtures are promoted from 60% to 80% and 10% to 20% respectively compared with stone bituminous mixtures. Furthermore, the GB rebounding coefficient and absorption coefficient of wood bituminous mixtures are from 1/9 to 1/2 and two times respectively of the ones of stone bituminous mixtures. Those show that the wood bituminous mixtures have excellent elastic properties and noise reduction performance. 6 tabs, 6 figs, 6 refs.