Effects of two types of activated carbon on the properties of vegetation concrete and Cynodon dactylon growth

Abstract

Vegetation concrete is one of the most widely used substrates for slope ecological protection in China. However, there are still some imperfections that are disadvantageous for plant growth, such as high density, low porosity, insufficient nutrient retention ability and so on. In this paper, the effect of wood activated carbon and mineral activated carbon on the physicochemical properties of vegetation concrete is studied. The experimental results show that the activated carbon proportion in vegetation concrete is positively related to the porosity, permeability coefficient, water holding capacity, and nutrient content and retention ability, while it is negatively related to the dry density, water retention ability, cohesive force and internal friction angle. However, it should be noticed that when the proportion exceeds 2%, the average height, aboveground biomass and underground biomass of Cynodon dactylon decrease with increasing proportion of activated carbon. The effect of wood activated carbon is generally more remarkable than that of mineral activated carbon. In addition, according to the research results, the effect of activated carbon on vegetation concrete can last for at least half a year, although it does slowly deteriorate with increasing time. By comprehensive consideration of the current industry standard, previous research results and economical reasoning, the recommended type of activated carbon is wood, with a corresponding suitable proportion ranging between 1 and 2%.

Green cleanup of styrene-contaminated soil by carbon-based nanoscale zero-valent iron and phytoremediation: Sunn hemp (Crotalaria juncea), zinnia (Zinnia violacea Cav.), and marigold (Tagetes erecta L.)

“…Although nZVI-AC does not provide the soil with nutrients, its application cannot solve the deficit of nutrients or organic matter; however, it can stabilize toxic substances such as pesticides and heavy metals in the soil [ 48 ]. Moreover, when activated carbon is mixed with soil, the soil density can be decreased and the porosity and field water capacity can be increased [ 49 ]. The high porosity and large surface area of carbon-based materials make them excellent habitats for beneficial microorganisms, such as bacteria and fungi, which help in nutrient cycling and plant growth [ 50 ].…”

Overview of the application of ecological concrete in sponge city construction

“…To promote the mass use of ecological concrete for the sustainable development of the world (Kim and Park., 2016;Gao et al, 2020;Faiz et al, 2022;Kong et al, 2022), researchers need to continue their efforts to realize the industrial production of ecological concrete table 8.…”

Ecological Stoichiometric Changes and the Synergistic Restoration of Vegetation Concrete Restoration Systems under Different Precipitation Conditions

“…Its core is the base material mixture formed by mixing planting soil, organic matter, cement and an activation modifier in a certain proportion, and the mixing proportion of each component is determined by the geographical position, slope, rock mass properties and landscape requirements of the slope [2,9]. The mixture has strong anti-erosion ability, good physical and chemical properties, strong water and fertilizer retention capacity and it is suitable for the growth of slope plants [10,11]. The technology is especially suitable for disturbed damaged slopes with gradients between 45 • and 85 • and has been applied to more than 11 million square meters in water conservancy, transportation, mining, municipal projects and other fields [12].…”