Grass Planting Water Purification Test of Different Types of Ecological Concrete

LIU Anyao; HUANG Qiuming; LING Huikun; LING Bo

doi:10.3969/j.issn.1004-7328.2025.06.015

Abstract：Ecological concrete has been widely applied in ecological riverbank rehabilitation.By combining ecological concrete with grass planting for water purification,the efficiency of water quality improvement can be enhanced,further optimizing ecological restoration outcomes.Under conditions that meet the mechanical performance requirements of ecological concrete,three types of ecological concrete with porosities of 20%,25%,and 30%were prepared using natural stone and volcanic stone as aggregates.Grass was planted on the ecological concrete,and tests were conducted to evaluate the adsorption and purification of TN(total nitrogen),TP(total phosphorus),and COD(chemical oxygen demand)in both static and dynamic water environments.The results indicate that the optimal balance among water purification,vegetation growth,and mechanical performance is achieved under these mix proportions.In static water environments,the purification performance of ecological concrete is superior to that in dynamic water environments.Ecological concrete with 30%porosity exhibits better purification capabilities for TN,TP,and COD.Volcanic stone ecological concrete demonstrates better water purification performance compared to conventional natural stone ecological concrete.From the perspective of practical engineering applications,the growth of plants on cast-in-place volcanic stone ecological concrete improves with increasing porosity,reaching a maximum plant height of 55.1 cm at 30%porosity.