路桥外文翻译毕业设计

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1、附录外文资料原文及翻译Porous Elastic Road Surface as An Ultimate Highway NoiseMeasureS. MEIARASHIAdva need Material Team, Material & Geotech ni cal Research Group, Public WorksResearch In stitute, Japa nmeipwri.go.jpAbstractHighway traffic no ise in urba n areas of Japa n is a serious problem, not only for

2、 reside nts along highways, but also for highway adm ini strators. Only 13 perce nt of urba n highways have met the en vir onment sta ndard for no ise. Noise barriers cannot be used as a no ise coun termeasure on the majority of highways on which access is not con trolled. Noise levels of areas alon

3、g some urba n highways exceed the sta ndard by 15 dB(A) or more. This problem is imped ing new highway con struct ion in urba n areas. Porous asphalt paveme nt has rece ntly bee n in troduced on urba n highways in Japa n. Its no ise reducti on effect of 3 dB(A) is in sufficie nt, because it only imp

4、roves the no ise en vir onment satisfacti on rate by a few perce nt. Furthermore, the durability of its no ise reducti on effect usually seems to be only three years, which is shorter tha n its life-cycle as paveme nt.The Public Works Research In stitute (PWRI) has, since 1993, bee n developi ng a n

5、ew low-noise pavement named “PorousElastic Road Surface ”(PERS). This new paveme nt has a porous structure composed of granu late rubber made from old used tires as its aggregate and uretha ne res in as its bin der. Its porosity is approximately 40 perce nt. The paveme nt was first proposed in Swede

6、 n in the 1970s, however, Swedish researchers have failed to improve it as a practical paveme nt. Noise reduct ion levels are 15 dB(A) for cars and 8 dB(A) for trucks. The author estimates that the pote ntial no ise reducti on levels in Leq exceed 10 dB(A). More tha n 90 perce nt of highways in urba

7、 n areas would meet the sta ndard if this no ise reducti on level were achieved. The PWRI has already solved several of the problems with PERS, for example, in sufficie nt adhesi on betwee n the paveme nt and the base course, low skid resista nee, and its poor fireproof performa nee. Its tech ni cal

8、 level has already reached the stage of test con struct ion on urba n highways.This paper examines the general performanee of PERS obtained through past developme nt at the PWRI. It also summarizes the results of rece nt research done to further improve the no ise reduct ion levels of PERS and the f

9、irst test con structi on using PERS in Japan. The final noise reduction target for any type of vehicle is between 15-20 dB(A). The author expects that PERS will reduce highway traffic no ise problems in urba n areas of Japa n to a minor, n egligibllevel in the near future.Key words:paveme nt, no ise

10、 reducti on, highway traffic no ise, skid resista nee, durability, adhesi on1. IntrodutionThe Public Works Research In stitute (PWRI) has, since 1993, bee n developi ng a new low-noise pavement named “PorousElastic Road Surface ”(PERS). This new paveme nt has a porous structure composed of granu lat

11、e rubber made from old used tires as its aggregate and uretha ne res in as its bin der. Its porosity is approximately 40 perce nt. The paveme nt was first proposed in Swede n in the 1970s, however, Swedish researchers have failed to improve it as a practical paveme nt. Noise reduct ion levels are 15