Enhancing the Mechanical Properties and Water Permeability of Pervious Planting Concrete: A Study on Additives and Plant Growth

Abstract

Pervious planting concrete (PPC) is in line with the concept of ecological environmental protection. However, due to its own porous structure, it is difficult to obtain excellent mechanical properties and water permeability at the same time, which hinders its promotion and application. In this paper, natural gravel (NG), ordinary Portland cement (OPC), polyvinyl alcohol latex powder (PVAP) and polycarboxylate superplasticizer (PS) were used to prepare the PPC, and its mechanical properties and water permeability were studied. Three kinds of plants were planted in the PPC and their planting properties were studied. At the same time, the effect of Bacillus on the planting properties was studied. The results show that when the water–binder ratio (W/B) was 0.28 and the PVAP content was 0.8%, both the mechanical properties and water permeability of the PPC were optimal. The compressive strength and permeability coefficient were 14.2 MPa and 14.48 mm/s, respectively. The mechanical properties and water permeability of PPC prepared with 10~20 mm NG were better than those prepared with 5~10 mm NG. Among the three plants, the germination rate and growth of Elymus dahuricus Turcz (EDT) were the best. The incorporation of Bacillus can optimize its planting properties and promote the effective combination between plants and the PPC substrate.

Study on the Performance Optimization of Plant-Growing Ecological Concrete

“…Haji et al [34] indicated that pervious concrete exhibits better permeability when the fly ash content is 0%-5%; when the fly ash content is 5%-25%, the permeability of pervious concrete shows a declining trend. Considering that the permeability of pervious concrete can well characterize the continuous porosity [35], this experiment obtained the same trend with fly ash content ranging from 10% to 30%. The order of influence of three response factors on the pH value o logical concrete is fly ash content > design porosity > water-binder ratio stood from the previous variance analysis that the interaction between W/B, F, and P is not statistically significant.…”