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  PERVIOUS / POROUS CONCRETE Guide name :- Submitted by :-SandeepGoyal Sir Advin KujurChandini RamtekeNitin SahuRupanshi RathodDevesh Joshi  About Pervious concrete  Pervious concrete is a mixture of cement, water, and coarse aggregate, and little to no sand. It also frequently contains chemical admixtures. Pervious concrete creates a very porous medium that allows water to drain to the underlying soils. By allowing rain events to penetrate the pavement to the underlying soils, the first flush of the paved surface is contained on site. The natural infiltration of the area remains unchanged so the water can recharge the water table. This avoids surface runoff that must be held in detention ponds or added to the storm water surface runoff, which must then be treated before it is returned to the local streams. In many cases the pavement may also be designed with a layer of coarse granular material below the pavement to increase the storage potential of the system. This has proven to be an effective tool to increase the area of usable pavement on a project as well as satisfy local water management regulations.   Pervious concrete consists of cement, coarse aggregate and water with little to no fine aggregates. The addition of a small amount of sand will increase the strength. The mixture has a water-to-cement ratio of 0.28 to 0.40 with a void content of 15 to 25 percent.  The correct quantity of water in the concrete is critical. A low water to cement ratio will increase the strength of the concrete, but too little water may cause surface failure. A proper water content gives the mixture a wet-metallic appearance.   Pervious concrete can improve water quality by capturing the “first flush” of surface runoff, reduce temperature rise in receiving waters, increase base flow, and reduce flooding potential.The pavement creates a short-term storage detention of rainfall. In order to fully utilize these benefits, the hydrological behavior of the pervious concrete system must be assessed. The hydrological performance is usually a key parameter in decisions to use this material as a best management practice (BMP) for storm water management and is the characteristic of most interest to permit-granting agencies.  Pervious concrete is traditionally used inparking areas, areas with light traffic, residentialstreets, pedestrianwalkways, andgreenhouses.It is an important application for sustainableconstructionand is one of manylow i   mpact developmenttechniques used by builders to protectwater   quality.
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