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Sustsinble Material Essay

1281 words - 5 pages

Sustainable material -POROUS PAVEMENT-- OPEN-JOINED PAVING BLOCKSIntroduction:This essay will focus on the application of open-joined paving blocks to minimize the impact of urban development on natural drainage system-capturing, slowing and absorbing storm water in the urban condition. In the natural system, 10% surface flow,30% evapotranspiration, 40% infiltration, 20% interflow, while in an urban condition, 75% surface flow to pipes, 15% evapotranspiration, 5% infiltration, 5% interflow. The unbalanced water distribution when water comes to the ground causing severe problems as flooding and erosion, destroying natural habitat and insufficient fill-in of water table. [1: Page 3-4, San Mateo County sustainable green streets and parking lots design guidebook]Figure1. open-joined paving blocks, http://en.wikipedia.org/wiki/Permeable_pavingFigure3. porous aggregate, http://www.sourcecontrol.co.uk/Integra.htmFigure4. porous turf, http://www.invisiblestructures.com/grasspave2.htmlFigure2. porous concrete http://www.tececo.com/technical.permecocrete.phpPorous pavement could increase the infiltration rate and interflow rate and reduce the overwhelmingly high rate of surface flow. Porous pavement materials include: porous aggrregate, porous turf, plastic geocells, open-joined paving blocks, open-celled paving grids, porous concrete, porous asphalt. Open-joined paving blocks is one of the most commonly used.Open-jointed paving: open-jointed paving blocks are solid units shaped or placed to leave open space in the joins between adjacent units. The blocks are manufactures from concrete, clay or from natural stones or wood. The joins are filled with porous aggregate or vegetated soil. Together, the blocks and joins form a composite surface that can be porous and permeable while bearing traffic loads though the structure.TechniquesWhat does porous pavement system do and not do?Pervious paving allows rainwater to either pass through the paving system itself or through joint openings between pavers. They are designed to capturing, slowing and absorbing storm water, they cannot treat the pollutants leaking form vehicle on roads.[2: page 23, San Mateo County sustainable green streets and parking lots design guidebook ]How does it work?Porous pavement includes pervious surface, bedding layer, reservoir layer and filter layer: the surface layer directly receives the traffic load and the disintegrating effects of traffic abrasion. It is likely to be made of special, relatively expensive material resist abrasion and provide qualities such as appearance and accessibility. Bedding layer builds up the thickness of a pavement with comparatively protect the subgrade from frost penetration. Reservoir is any proportion of a pavement that stores or conveys water while it exists through a drainage pipe or into the soil. Water infiltrate form the reservoir into the subgrade. It may include a Lateral outlet system- a pipe or any other lateral outlet can discharge excess...

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