Pervious Pavements-Installation, Operation and Strength.

摘要

Pervious pavement systems have been recognized as a best management practice by the Environmental Protection Agency (USEPA, 1999) and in the new Draft Statewide Stormwater Rule for the state of Florida. This type of pavement system allows for the rapid passage of water through either its joints or porous structure and infiltration into the underlying soils. Permeable pavements provide an alternative to the traditional impervious pavements. The advantages include reducing the volume of surface runoff; reduced need for stormwater infrastructure, less land acquisition for stormwater ponds, improved road safety by reduced surface ponding and glare, and a reduced urban heat island effect. Additionally permeable pavements, by using regional or recycled materials such as local recycled automobile tire chips (used in construction of the surface layer), tire crumbs (used in blending of the pollution control media), and crushed concrete aggregates, can contribute to earning LEEDTM points. By reducing runoff from pavement surfaces, a reduction in the mass of pollutants carried downstream by runoff water can be achieved thus minimizing non-point source pollution. The strength of a pervious pavement system depends on compressive and flexural properties of the material along with the strength of the supporting underlying subgrade. As a result of its porous nature (no fines) to achieve high permeability, the compressive strength and flexural strength are both lower when compared to conventional concrete and asphalt pavements and these pavements are designed to carry lighter vehicular loads. Four types of pervious pavement systems pervious concrete, porous asphalt, permeable pavers and Flexipave, are installed and have been studies at the Stormwater Management Academy field laboratory on the campus of the University of Central Florida. The results are presented in four parts corresponding to each pavement type.