Research On Porous Concrete Plant Compatibility

Eco-porous concrete(EPC)is a new type of concrete structural material formed by proper mixing and vibrating of single granular coarse aggregate,water and cement.Because of its special skeleton structure and the effective porosity of 30%or so,the porous concrete can meet the needs of plant growth by filling soil,nutrients and water holding materials into the pores.The ecological porous concrete can be used in parking lots,roadside revetment and shoulder clapboard,etc.it has the advantages of keeping water,absorbing sound and reducing noise,alleviating urban heat island effect and improving ecological environment.EPC has become one of the hot spots for scholars both at home and abroad.EPC has the characteristics of high basicity,low strength,low connectivity porosity and uneven pore structure.It is the bottleneck of the preparation of green ecological concrete and the key to its application.On the other hand,from the point of view of vegetation species selection and cultivation,the compatibility of EPC with vegetation species and its growth characteristics in EPC were discussed.Therefore,it is of great significance to study EPC plant compatibility and biological characteristics of plants in EPC.The main conclusions are as follows:(1)Reference to common concrete mixture ratio design principles.Proposes two feasible ecological porous concrete mixture ratio design method,volume method and specific surface area method,details the design method is proposed,and its feasibility is verified by experiment.(2)Based on the ecological environment of Bermuda grass,tall fescue and perennial ryegrass,the germination rate of Kentucky bluegrass,morphological characteristics and growth characteristics such as law research,has proven the Bermuda grass,tall fescue and perennial ryegrass,Kentucky bluegrass four vegetation and ecology of porous concrete are chemical compatibility of the basicity of the critical conditions,for different alkaline environment optimization under the condition of different vegetation species provides the reliable theory basis.(3)This paper discusses the planting soil,organic fertilizer,additive,perlite and water.Main influence factors such as the impact on the ecological plant growth characteristics of porous concrete.The results show that the organic fertilizer and tillage planting soil are the main factors influencing the plant germination.At the same time.It is concluded that the four grass grow most adapted to materials.Planting soil,water,organic fertilizer,additive,perlite)the ratio of the optimal combination of the Bermuda grass(36%:11%:8%:36%:11%)and tall fescue(41%:9.8%:7%:41%:9.8%).Kentucky bluegrass(46%:6%:7%:12%:28%).Perennial ryegrass(45%:9%:6%:45%:9%).the optimal combination of the growth of grass seed quality and ordinary soil.(4)The research results of EPC soil water content:Discusses the Bermuda grass,tall fescue and perennial ryegrass,Kentucky bluegrass four planting were porous concrete physical compatibility and ecology,ecological soil moisture content is 50?60%of porous concrete.Four kinds of the growth of grass planting are affected.Cynodon dactylon.Kentucky bluegrass in ecological porous concrete while soil moisture content is 50?60%can be normal growth.Showing excellent drought resistance ability;Perennial ryegrass drought-resistant ability is poor.Its growth serious is restricted by soil water content;Tall fescue physiological indexes change with soil moisture content condition.Suitable for wet soil environment.And Kentucky bluegrass when soil moisture content is 70?80%growth affected,explain its wet resistance ability is poor.For different soil moisture environment optimization under the condition of different vegetation species provides the reliable theory basis.(5)A one-to-one correspondence rule of porous concrete structure and plant variety was established.And verified it through the pilot platform,which provides a theoretical guidance for the engineering application of eco-porous concrete.