Method for preparing concrete admixture by utilizing mixture of multiple biomasses

Abstract

The invention provides a method for preparing a concrete admixture by utilizing a mixture of multiple biomasses. The method comprises the following steps: drying any two, three or four biomass materials of rice straws, rice hulls, corn stalks and rape stalks; soaking at a temperature of 15-35 DEG C; washing with water, and baking; and ashing the treated biomass materials to obtain the admixture. The concrete prepared by the admixture has excellent mechanical performance and excellent physical performance, and is in accordance with various indexes of the concrete national standard. The preparation method has the advantage of recycling biomass ash to make waste profitable, and achieving remarkable social and beneficial benefits.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for preparing concrete by using biomass as an admixture. Background technique [0002] With the advancement of urbanization, urban construction requires a large number of different functions and different types of concrete. The continuous improvement of the functional requirements of concrete in engineering construction promotes the continuous application and promotion of new materials and technologies in concrete. Therefore, the variety and output of cement are increasing day by day worldwide. In order to economically improve the performance and durability of concrete, pozzolanic minerals have been mixed with cement as admixtures to mix concrete. In addition, natural pozzolanic materials, industrial waste (such as fly ash, blast furnace slag, silicon Powder) is also used as a pozzolanic material, and as agricultural waste, biomass contains a lar...

AI Technical Summary

Problems solved by technology

The process of grinding additive method is complicated, and it is difficult to eliminate its influence on the durability of concrete; while the existing incineration additive method incineration process is still far from perfect, and it is only applied to SiO in ash. 2 Rice husks, wheat stalks, rice stalks, etc., which have a relatively high mass proportion, limit the application of biomass types with high alkali metal content. For example, rape stalks that exist in large quantities in the southern region cannot be used as concrete admixtures at present.

Moreover, due to the low melting point of the existing biomass alkali metals, the phenomenon of ash slagging is inevitable, which greatly affects the specific surface area of ​​ash and hinders the SiO 2 active play

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