Method for preparing concrete admixture by utilizing mixture of multiple biomasses

A biomass material and biomass technology, applied in the field of building materials, can solve the problems of difficult to eliminate the influence of concrete durability, ash slagging, low melting point of metal, etc., achieve significant social and economic benefits, and achieve efficient use, The effect of good mechanical properties

Inactive Publication Date: 2012-09-19
HUNAN AGRICULTURAL UNIV
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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

Method used

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  • Method for preparing concrete admixture by utilizing mixture of multiple biomasses
  • Method for preparing concrete admixture by utilizing mixture of multiple biomasses
  • Method for preparing concrete admixture by utilizing mixture of multiple biomasses

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Embodiment Construction

[0014] The following examples are intended to illustrate the present invention without further limiting the invention.

[0015] The inventor will use any single biomass of rice stalks, rice husks, corn stalks and rape stalks as an additional admixture, and if the ash content of any single biomass meets the requirements as a cement admixture, then any of the four The ash content must be satisfied after the mixed combustion of two or any three or four kinds of biomass, the reason is that the main chemical composition of the mixed biomass material, especially SiO 2 The content must be higher than the lowest SiO provided in a single biomass 2 content. In addition, ashing after mixing various raw materials will also improve various properties of ash, such as specific surface area and ash melting point. For example: experiments have shown that when rape straw is mixed with any one, two or three of rice straw, rice husk, and corn stalk in equal quantities, the specific surface area...

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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...

Claims

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Application Information

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IPC IPC(8): C04B18/24C04B28/04
CPCY02W30/91
Inventor 刘保华刘巧玲张强刘芳
Owner HUNAN AGRICULTURAL UNIV
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