Solid-waste-based low-alkalinity porous ecological pervious concrete and preparation method thereof

Abstract

The invention discloses solid-waste-based low-alkalinity porous ecological pervious concrete and a preparation method thereof, and the solid-waste-based low-alkalinity porous ecological pervious concrete is prepared from the following raw materials in parts by mass: 10-20 parts of a low-alkalinity cementing material, 75-85 parts of tunneling gangue aggregate, 0.1-0.2 part of an adhesive, 0.03-0.04 part of a water reducing agent and 3.0-4.5 parts of water; the low-alkalinity cementing material is composed of a solid waste-based sulphoaluminate cementing material, mixed stone powder and desulfurized gypsum in a mass ratio of (75-85): (10-20): (3-5), and the mixed stone powder is a mixture of red gangue powder and waste stone powder. The preparation method comprises the following steps: stirring and mixing the tunneling gangue aggregate, a part of the tunneling gangue aggregate and a part of water, then adding the adhesive, the water reducing agent, the rest of the tunneling gangue aggregate and the rest of water, and continuously performing stirring and mixing. The pH value of the concrete can be compatible with the pH value of a soil environment required by normal growth of plants, and the cost of the ecological concrete can be greatly reduced.

Description

technical field [0001] The invention belongs to the field of ecological concrete, and relates to a solid waste-based low-alkalinity porous ecological permeable concrete and a preparation method thereof. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Ecological concrete, also known as porous planting concrete and greening concrete, can realize ecological planting while achieving safety protection. It is a new type of slope protection material that can well combine engineering protection and ecological restoration. Its main body uses aggregates of specific particle size as the supporting skeleton, which is wrapped by ecological gelling materials and aggregates, and has a c...

AI Technical Summary

Problems solved by technology

[0004] According to the inventor's discovery, most of the cementitious materials used in the preparation of traditional ecological concrete are ordinary portland cement, because ordinary portland cement will produce a large amount of hydration product Ca(OH) after hydration. 2 , leading to too high alkalinity in the pores of the currently prepared ecological concrete

It cannot meet the growth requirements of plant roots. After Portland cement is hydrated, the pH value of the slurry liquid phase equilibrium reaches 13.5, while the pH value of the soil environment required for normal plant growth is around 8-10. The two are difficult to be compatible.

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