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Development of Quiet and Durable Porous Portland Cement Concrete Paving Materials. Final rept.
| 题名： | Development of Quiet and Durable Porous Portland Cement Concrete Paving Materials. Final rept. |
| 作者： | Olek-J.; Weiss-W.J.; Neithalath-N.; Marolf-A.; Sell-E. |
| 关键词： | *Concrete-pavements; *Traffic-noise.;Durability-; Portland-cement-concrete; Acoustic-absorption; Safety-; Pavement-design; Noise-reduction; Mechanical-properties; Surface-properties; Aggregates-; Tire-pavement-interface. |
| 摘要： | This report outlines the systematic research effort conducted in order to develop and characterize Enhanced Porosity Concrete (EPC) to mitigate the problem of tire-road interaction noise. The basic tenet of this research is that carefully introduced porosity of about 15%- 25%in the material structure of concrete will allow sound waves to pass through and dissipate its energy. EPC mixtures were proportioned with three different aggregate sizes, and the binary blends of these sizes. The physical and mechanical properties of these mixtures were studied in detail. Methods to determine the porosity of EPC were developed. Flexural strengths of EPC specimens were studied in detail, and the influence of sand content, and silica fume were ascertained. The acoustic absorption coefficients of EPC were determined using an impedance tube. It was found that the pore volume and pore sizes have a significant influence on acoustic absorption. The tortuosity of the pore network, which forces the waves to travel longer, and the frictional losses in the pore walls are the main mechanisms that are responsible for energy loss. The influence of specimen thickness on the acoustic absorption coefficient is also brought out. |
| 报告类型： | 科技报告 |
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