Application Of Porous Concrete Sponge City Construction

The sponge cities refer to changes in the environment, natural disasters,the city has a better "flexibility".During the rainy season,it works as absorbing, saving, infiltrating and purificating, when needed "release" re-use.It can effectively reduce " the heat island effect", urban waterlogging and runoff pollution, conserve water, improve and protect the ecological environment,by sunken green, green roofs, permeable paving and other measures.Among them the permeable pervious concrete pavement for the development ushered in opportunities.It is a green concrete, with green, noise absorption, porosity and more lightweight, breathable and water permeability and good.It may also be used in rivers, lakes, coastal waters and marina, fixed sand and embankments,There are effects as fixed sand,fixed embankment, the vapor permeable.This article is a response to these problems a series of studies.The main contents of this paper:analysis of the background and significance of implementing measures sponges city, focusing on one of permeable paving materials-porous concrete.This article is divided section respectively of recycled aggregate, rubber aggregate on performance of pervious concrete and pervious concrete applications in coastal waters and chloride ions on the corrosion characteristics of pervious concrete were studied.Research shows:chlorine ion permeability coefficient varies with time decay and it gradually closer to ordinary concrete;The main factors affecting the rate of Cl-Permeability are cement ratio W/C and the degree of hydration,Cl - Permeability speed varies the increase of cement ratio and faster, larger decreases with the degree of hydration, and therefore appropriate to reduce the cement ratio, increasing the degree of hydration is an effective measure porous concrete chlorine ion penetration decreases.