Experimental Study On Permeability Of Concrete

Pervious concrete is also called porous concrete, permeable floor, it is a kind of porous lightweight concrete by the aggregate, cement and water mixed together, it doesn’t contain fine aggregate, and the formation of honeycomb structure holes uniformly distributed by the coarse aggregate surface is coated with a thin layer of cement slurry are bonded to each other, so it is breathable, waterproof and light weight. Characteristics, also called drainage concrete. Europe and the United States, Japan and other countries by the original city road surface defects, developed the use of a can let the rain into the underground, effectively replenish the groundwater environmental problems, some city fell sharply and relieve the city underground water level. And can eliminate the harm ground oil compounds of environmental pollution effective; at the same time, is an excellent pavement material to protect the nature, to maintain ecological balance, can reduce the urban heat island effect; it is conducive to the healthy development of human living environment and city water management and water pollution prevention and control work, has a special significance the. But the pervious concrete development history in China is relatively short, there are still many problems need to be studied.Pervious concrete is a kind of ecological environmental protection concrete, is made by special technology with continuous porous concrete, which has a certain strength, but also has a certain permeability. The matching experiments are carried out to study the ratio of system design and performance, the main research contents and results are as follows:1. The mix design of porous concrete with volume method, through a lot of experiments to demonstrate the feasibility of this method;2. With the pervious concrete ratio, preparation, strength, water permeability are discussed and research: in this experimental condition can satisfy the compressive strength greater than20MPa, permeability coefficient of best fit1mm/s pervious concrete requirements of more than, the one-time feeding, vibration molding process;3. Using the self-made tester permeability coefficient test, empirical formula of permeability coefficient K and the pore of P is obtained:K7d=0.179P1.427K28d=0.138P1.5154. Summarizes and analyzes the main factors influencing the strength and permeability of pervious concrete.