Research And Application Of Mixture Ratio Optimization Design Of Recycled Aggregate Porous Concrete

In view of the low strength,poor frost resistance and complicated construction process of porous concrete in practical applications,this paper studies the mechanical properties of recycled aggregate porous concrete by factors such as recycled aggregate size,design target porosity and water-to-binder ratio.The effect of water permeability.The optimal mixing ratio of mechanical properties and the better mixing ratio of water permeability were obtained by orthogonal experiment.Two kinds of tests were carried out to analyze the relationship between compressive strength,water permeability and effective porosity of recycled aggregate porous concrete.The balance point of the three was used as the target to determine the optimum ratio of high-strength and reasonable water permeability..On the basis of the concrete with the optimal mix ratio,under the premise of ensuring the strength and porosity of the recycled aggregate porous concrete,the method of adding plastic steel fiber,polyacrylonitrile fiber and rubber powder to improve the recycled aggregate porous concrete Frost resistance.Through the orthogonal test,the optimal dosage of fiber and rubber powder is obtained.By comparing the test,2% sand is added,which can improve the frost resistance and compressive strength of the recycled aggregate porous concrete.Preliminary research and application of vegetative test on porous concrete,preferably two kinds of grass,namely tall fescue and ryegrass,by observing the germination time,survival rate of the two grasses and whether the roots of the grass can penetrate the porous concrete and the lower concrete Under the conditions,it is concluded that tall fescue is more practical to grow in porous concrete.This vegetative test created conditions for the practical application of porous concrete in the ecological river channel slope.The final parameters of the recycled aggregate porous concrete are as follows: the target porosity is 30%,the water-to-binder ratio is 0.30,the aggregate particle size is A3(20-25mm),the plastic fiber is 0.1%,and the polyacrylonitrile fiber is mixed.The dosage is 0.06%,the rubber powder dosage is 2%,and the sanding rate is 2%.