Admixture for vegetation-form ecological concrete and compounding method thereof

Abstract

The invention discloses an admixture for vegetation-form ecological concrete and a compounding method thereof, which relate to the technical field of cement concrete admixtures. The admixture is compounded by, by weight, calcium carbonate 5-10 parts, silica powder 40-50 parts, lignosulfonic acid 5-8 parts, sodium nitrite early strength agent 1-3 parts, hydroxy carboxylic acid high-efficiency water reducing agent 1-3 parts, polyacrylamide water-retaining agent 0.3-0.4 part and dodecyl sodium sulfate air entraining agent 0.01-0.02 part. The admixture compounded by the components is added into the vegetation-form ecological concrete so that the admixture can improve the mechanical strength and durability of the concrete, controls and ensures water permeability, porosity, homogeneity and the like of the concrete, and improves chemical resistance, potential of hydrogen, biocompatibility and other functions of the inside and the surface of the concrete.

Description

technical field [0001] The invention relates to the technical field of cement concrete admixtures, in particular to the admixtures added to plant-growing ecological concrete. Background technique [0002] Vegetative ecological concrete is a new type of ecological building material, which has attracted more and more attention from people in the industry. The concrete is developed on the basis of the porous concrete in the past, further combining environmental problems, coordinating the ecological environment, reducing environmental load, preserving and improving the environmental landscape. Traditional porous concrete is often made of cement and aggregates of a certain grade. There are the following problems in the process of planting, grass and greening: [0003] (1) The strength is low. Porous concrete is prepared with pure cement paste, the bonding ability between cement paste and aggregate is limited, the compressive strength of sand-free porous concrete is often below ...

AI Technical Summary

Problems solved by technology

Porous concrete is prepared with pure cement paste, the bonding ability between cement paste and aggregate is limited, the compressive strength of sand-free porous concrete is often below 10MPA, and the strength is reduced

[0004] (2) The effective porosity is not easy to control

Because the cement paste is easy to flow, during the construction of porous concrete, due to the action of gravity, the cement paste in the lower part often has too much cement paste, which blocks some or all of the pores and reduces the effective porosity; while the upper cement paste is relatively heavy. Less, it is difficult to wrap all the aggregate particles, and the bonding force between the slurry and the aggregate is poor, resulting in the phenomenon of "running stones"

Therefore, the effective porosity of porous concrete is not easy to control

[0005] (3) The alkali content is too high, which is not conducive to plant growth

Porous concrete is prepared with pure cement slurry, the amount of cement is generally large, the cement hydration products are more, and the internal alkali content is too high, which is not conducive to plant growth.

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