二级公路毕业设计外文文献

外文资料及翻译Effects of Design Features on Rigid Pavement PerformanceThe performance of rigid pavements is affected by a variety of design features, including slab thickness, base type， joint spacing, reinforcement, joint orientation， load trans fer, dowel bar coatings， longitudinal joint design， joint sealant， tied concrete shoulders ，and subdrainage 。 A study was made by ERES Consultants, Inc 。 under FHWA contract on the effects of these features on rigid pavement performance . Ninety—five pavemen tsections located in four major climatic regions were thoroughly evaluated 。 The following conclusions ， which provide some revealing insights into pavement performance ， are abstracted from the report （Smith et al。， 1990a）.Slab Thickness The effect of slab thickness on pavement performance was significant.It was found that increasing slab thickness reduced transverse and longitudinal cracking in all cases. This effect was much more pronounced for thinner slabs than fo rthicker slabs 。 It was not possible to compare the performance of the thinner slabs and the thicker slabs directly ， because the thick slabs were all constructed directly on th esubgrade and the thinner slabs were all constructed on a base course 。Increasing the thickness of slab did not appear to reduce joint spalling or join tfaulting . Thick slabs placed directly on the subgrade， especially in wet climates an dexposed to heavy traffic， faulted as much as thin slabs constructed on a base course .Base Type Base types， including base/slab interface friction， base stiffness， base erodibility ， and base permeability ， seemed to have a great effect on the performance of jointed concrete pavements 。 The major performance i...