Method for preparing concrete admixture by using biomass

A technology of biomass and admixtures, applied in the direction of cement production, etc., can solve the problems that it is difficult to eliminate the influence of concrete durability, affect the specific surface area of ​​ash, and the low melting point of metals, so as to achieve significant social and economic benefits and ensure safety The effect of reliability and 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 alkali metals in biomass, 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 using biomass
  • Method for preparing concrete admixture by using biomass
  • Method for preparing concrete admixture by using biomass

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Embodiment Construction

[0019] The biomass used is taken from rice straw, rice husk, corn stalk, and rape stalk from the experimental base of Hunan Agricultural University. After natural drying, it is refined (the length of each biomass is controlled to be ≤20cm), soaked and washed, and then dried. The steps are as follows: Soak the refined biomass in tap water at a temperature of 15°C to 35°C for 24 hours, and control V 水 :m 生 物质 =15ml / g~30ml / g, take it out and dry it. Water temperature, time and liquid-solid ratio (V 水 :m 生物质 ) range is determined on the basis of the following: ①The solubility of substances is related to temperature, the solubility of K contained in biomass increases with the increase of temperature, the solubility of Na contained in biomass is slightly affected by temperature, and the part contained in biomass Ca solubility decreases with increasing temperature. Comprehensively considering the solubility of various water-soluble substances, the difficulty of realizing water t...

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Abstract

The invention relates to a method for preparing concrete admixture by using biomass. The method is characterized in that the method comprises the steps of: drying the biomass, soaking at 15-35 DEG C, washing with water and drying; and ashing the treated biomass to obtain the admixture, wherein the mass content of SiO2 in the treated and ashed biomass is not less than the mass content of SiO2 of agricultural and forestry waste with concentration being 30 percent. After the admixture is added into concrete, the concrete still has good mechanical performance and excellent physical performance and satisfies the requirements on all indexes in the national standard. By recycling biomass ash, the wastes are turned into valuable things and the social and economic benefits are remarkable.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to an admixture method for preparing concrete by using biomass. 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 large am...

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Application Information

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IPC IPC(8): C04B7/28
CPCY02P40/10
Inventor 刘保华刘巧玲张强方亮杨敬林
Owner HUNAN AGRICULTURAL UNIV
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