Study On Performance Of Porous Concrete And Applicability Of Ecological Slope Protection

In this paper,the porous concrete is taken as the research object.The ecological slope protection of planted porous concrete is divided into regions,and the performance of porous concrete in different area is tested.Among all researches,there are several study programs,the first study was the compressive strength of porous concrete,the second is the phytogenic properties of porous concrete,and the third is the comprehensive water purification effect of porous concrete.Based on the results of experimental studies,the advantages of ecological slope protection of planting porous concrete is analyzed,and the structure,construction technology and comprehensive benefit of ecological slope protection of planting porous concrete are discussed.The main research contents and results are as follows:(1)In order to study the influence of water-binder ratio,porosity and coarse aggregate size on the compressive strength of porous concrete and determine the relationship between the three factors and the compressive strength of porous concrete,porous concrete specimens are prepared with water-binder ratio: 0.25,0.27,0.3,target porosity: 22%,24%,26%,28% and coarse aggregate diameter: 10-15 mm,15-20 mm,20-25 mm,10-25 mm,and its compressive strength tests are carried out.According to the changing trend of compressive strength of concrete specimens with different test factors,the influence of various factors on the compressive strength of porous concrete is analyzed.The results show that: the water-binder ratio,porosity and coarse aggregate size of porous concrete play-important roles in the physical and mechanical properties of porous concrete.With the increase of water-binder ratio,the compressive strength of porous concrete specimens shows the law of increasing first and then decreasing,and the compressive strength of porous concrete specimens with water-cement ratio of 0.27 is the highest.The strength of porous concrete decreases obviously with the increase of target porosity,which indicates that the porosity of the porous concrete is an important factor affecting the compressive strength of the porous concrete.With the increase of coarse aggregate size,the compressive strength of porous concrete decreases continuously,and compared with coarse aggregate with larger particle size,the strength of porous concrete prepared by coarse aggregate with good gradation is higher.(2)By orthogonal test,4 factors,including coarse aggregate particle size,porosity,specimen thickness and pore filler,were tested at 4 levels,respectively.IBM SPSS Statistics 22 data analysis software is used to analyze the plant growth height and plant weight data measured in the experiment,and to study the significance of the influence of various factors on the phytogenic energy of porous concrete.The results show that: porous concrete has good plant growth performance.And its thickness is an important factor affecting the height of grass growth,while the porosity,pore filler and coarse aggregate size of porous concrete have little effect on the height of grass planting.When plant weight is taken as an index to evaluate the growth performance of porous concrete,the porosity of porous concrete,the thickness of specimen and the diameter of coarse aggregate are all the important factors that affect the growth performance of porous concrete,which is necessary to consider in the practical application of porous concrete.But the effect of pore fillers on its phytogenic properties is not significant.(3)Equipments of the water purification experiment were designed to simulate natural water environment.Water purification ability of the ecosystem consisted of Typhaorientalis Presl,Nelumbo Nucifera and Margarya Melanoide was studied.The ecological adaptability of porous concrete and the whole water purification ability of porous concrete and the ecosystem were analyzed.The results show that: the combination ecosystem in the experiment has good water quality purification ability,which indicates that it is feasible to combine Typhaorientalis Presl,Nelumbo Nucifera and Margarya Melanoide to purify sewage.After combined application of aquatic organisms and porous concrete,the efficiency of removing pollutants by aquatic plants is improved,which is better than the removal effect of pollutants by aquatic plants in single application.Aquatic plants,Snails and microbes can grow on porous concrete,which indicates that porous concrete has good ecological adaptability and can be used as ecological slope protection materials to purify sewage by combined application with aquatic plants.(4)Based on the analysis of the ecological slope protection structure,construction technology and its comprehensive benefit,it is concluded that the ecological slope protection of planting porous concrete not only has the effects of water purification,landscape and ecology,but also has the advantages of strong integrity,good scour resistance,low requirements for riverbank soil quality and river slope,simple and diverse construction methods,low engineering cost,etc.It is an ideal ecological slope protection and has strong engineering applicability and wide application prospects.