Preparation method of high-strength concrete expansive agent material
A technology for concrete and expansion agent, applied in the field of expansion agent materials, can solve the problems of poor strength of composite magnesia cement expansion agent materials, and achieve the effects of increasing the degree of irregularities and defects, modifying mechanical properties, and improving weak alkaline state.
Inactive Publication Date: 2018-11-23
FOSHAN LINGCHAO NEW MATERIAL CO LTD
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Problems solved by technology
[0004] Technical problem to be solved by the present invention: Aiming at the problem of poor strength of the existing composite magnesium oxide cement expansion agent material, a preparation method of high-strength concrete expansion agent material is provided
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[0016] In terms of parts by weight, weigh 45-50 parts of lime, 25-30 parts of magnesium slag and 10-15 parts of fly ash respectively, place them in a mixer, stir and mix them and place them in a ball mill tank, at 250-300r / min After ball milling for 3 to 5 hours, pass through a 200-mesh sieve to obtain sieved powder and control the specific surface area of the ball mill to 300-350m2 / kg to collect the mixed powder; add 200-mesh blast furnace slag powder to deionized water at a mass ratio of 1:15, Stir and mix and ultrasonically disperse at 200-300W for 10-15 minutes, collect the dispersion; add cornstarch to deionized water at a mass ratio of 1:10, stir and mix and place at 85-90°C for 55-55 to gelatinization After 60 minutes, collect the gelatinized liquid and adjust the pH to 10.0 with 5% sodium hydroxide solution by mass fraction, let it stand for 6-8 hours, and collect the modified starch gelatinized liquid; weigh 45-50 parts of the dispersion liquid in parts by weight , ...
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Abstract
The invention relates to a preparation method of a high-strength concrete expansive agent material, and belongs to the technical field of expansive agent materials. According to the technical scheme of the invention, starch and fatty acid are adopted as modified materials, and a starch-fatty acid compound is insoluble in acid but insoluble in alkali so as to be precipitated under the acidic condition and coat kieselguhr particles, so that a starch-fatty acid modified kieselguhr aggregate is formed and can coat kieselguhr so as to form effective coating; during the use process, ground magnesiumslag particles are refined and coated so as to be modified, so that the contact surface area of magnesium slags and water is increased, native lattices of the magnesium slag particles are promoted tobe distorted or damaged, a new surface with high energy is generated, the irregularity and the defect level of the structure are increased, and the chemical activity of the magnesium slags is improved; the magnesium slags and coal ash can be filled in gaps of aggregate and cement hydration, so that the pores are refined, the porosity is reduced, the pore structure is improved, the compactness isincreased, and the mechanical property of the expansive agent material is further modified.
Description
technical field [0001] The invention relates to a preparation method of a high-strength concrete expansion agent material, which belongs to the technical field of expansion agent materials. Background technique [0002] With the gradual deepening of coal mining depth, the situation of coal mine safety production is severe. In the coal mine sealing process, cement-based sealing materials are widely used. There are problems such as drying shrinkage of cement materials, resulting in the formation of "crescent" pores in the upper part of the borehole, shortening the length of the effective sealing section, increasing the possibility of air leakage through the internal and external cracks of the borehole, and resulting in the failure of the borehole sealing. Researchers have done a lot of research work on cement-based sealing materials, and the method of adding cement expansion agent is often used to improve its expansion performance. The expansion agent can compensate the shri...
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IPC IPC(8): C04B24/38
CPCC04B40/0046C04B2103/0068C04B24/24C04B24/08C04B24/38C04B22/062C04B22/064C04B18/144C04B18/08C04B18/141C04B22/002
Inventor 裘友玖韩桂林
Owner FOSHAN LINGCHAO NEW MATERIAL CO LTD