Mineral admixture concrete and preparation method thereof

Abstract

The invention relates to mineral admixture concrete and a preparation method thereof and belongs to the field of building materials. The preparation method is characterized in that a composite solid exciting agent is utilized to excite potential activity of a mineral admixture and produces a synergistic effect with common cement so that the mineral admixture concrete having strength of C30-C70 and excellent durability such as anti-permeability and frost-resistance and allowing normal setting time is obtained. The composite solid exciting agent can greatly improve the strength and the durability of the mineral admixture concrete. Through replacement of 90 to 95% of cement with a large amount of an industrial waste residue-slag powder-fly ash admixture, a production cost is reduced obviously. The mineral admixture of a cementing agent, a sand aggregate and the composite solid exciting agent is pre-stirred and then is added with mixing water so that the composite solid exciting agent is dispersed uniformly and after addition of the mixing water, the mineral admixture can be fully excited. In construction, the mineral admixture concrete has good workability and no ropiness, can be operated easily, has high strength after setting and hardening, good durability and a low cost, and can be used in various engineering construction and concrete products.

Description

technical field [0001] The invention relates to a mineral admixture concrete and a preparation method thereof, which is used in various engineering constructions and concrete products, and belongs to building materials. Background technique [0002] Concrete is a traditional building material, and with the increase of its usage, resource, energy and environmental problems are becoming more and more prominent. In the traditional cement production, the consumption of original resources is large, the emission of waste gas and dust is large, and it causes serious pollution to the environment. Occupy as little resources as possible, reduce energy consumption, and reduce waste emissions, so as to meet the requirements of sustainable development, better coordinate with the environment and conform to the circular economic model. [0003] The production of new concrete should make full use of industrial waste residues, such as slag, fly ash, etc., use no or less cement clinker, redu...

AI Technical Summary

Problems solved by technology

[0005] At present, the most effective alkali activator for stimulating industrial waste is low-modulus liquid water glass, but the use of liquid water glass has the following disadvantages: (1) poor stability, greater harm to people and the environment, and is not conducive to transportation and storage (2) The alkali-activated cement concrete mixture produced on-site has a high viscosity, which is very inconvenient for construction; (3) The setting time is difficult to control, and the phenomenon of rapid setting or non-setting is easy to occur in the actual concrete application, and the strength is difficult to guarantee; (4) Condensed concrete is prone to frost and cracks

The solid activators with good early excitation effects are mostly NaOH and KOH. NaOH and KOH are very easy to absorb moisture in the air and deliquesce. When they are ground together with the gelling material, local alkali-gelling material hydration will occur. reaction, causing the alkali gelling material to fail quickly

If solid alkali metal silicates are used, due to their low solubility in water and slow dissolution rate, it is difficult to achieve the effect of stimulating slag and fly ash alone, even if instant powdered sodium silicate with better solubility is used Stimulate slag and fly ash, but it is difficult to achieve the effect because the coagulation time is too long (more than 24h)

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