Low-shrinkage quick-setting gangue-based alkali-activated quick repair material and preparation method thereof
A repair material and coal gangue technology, which is applied in the field of low-shrinkage and fast-setting coal gangue base-activated rapid repair materials and its preparation, can solve the problems of affecting the life of the repaired road surface, weakening the strength of the material, and cumbersome steps to achieve a compact system and easy Simple effect of implementation and preparation method
Active Publication Date: 2020-09-01
WUHAN UNIV OF TECH
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Problems solved by technology
Alkali-induced material shrinkage will cause cracking, which will affect the life of the repaired pavement
[0005] At present, there are many strategies for improving the shrinkage of alkali-activated cementitious materials, such as press molding; high-temperature curing; The addition of shrinkage reducing agent and expansion agent may weaken the strength of the material, or the cost is too high and the steps are cumbersome, which limits its popularization and application
Method used
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Embodiment 1-3
[0036] A low-shrinkage and fast-setting coal gangue-based base-activated rapid repair material is provided, and the specific preparation method steps are as follows:
[0037] 1) Mix sodium hydroxide, industrial water glass and water evenly to prepare the required alkali solution;
[0038] 2) After mixing the coal gangue, mineral powder and sulphoaluminate cement, stir at a slow speed until the mixture is uniform;
[0039] 3) Add the alkali solution obtained in step 1) to the mixed material obtained in step 2), stir slowly for 60s, stir rapidly for 30s, let stand for 90s, and finally stir rapidly for 60s to obtain a slurry, wherein the slow stirring speed is 62 ± 5r / min, the fast stirring speed is 125±10r / min;
[0040] 4) Pour the slurry obtained in step 3) into the mold, remove the mold after 1 day and carry out standard curing, and obtain the low-shrinkage and fast-setting coal gangue base-activated rapid repair material.
[0041] Examples 1-3 See Table 1 for the ratio of r...
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Abstract
The invention discloses a low-shrinkage quick-setting gangue-based alkali-activated quick repair material and a preparation method thereof. The alkali-activated quick repair material is prepared from,by mass, 400 to 500 parts of coal gangue, 500 to 600 parts of superfine slag powder, 40 to 50 parts of sodium hydroxide, 200 to 240 parts of industrial water glass, 30 to 70 parts of sulphoaluminatecement and 260 to 300 parts of water. The preparation method comprises the following steps: 1) uniformly mixing sodium hydroxide, industrial water glass and water to obtain an alkaline solution; 2) uniformly mixing coal gangue, mineral powder and sulphoaluminate cement; 3) adding the alkaline solution into the obtained mixture, and stirring to obtain slurry; and 4) pouring the slurry into a mold,removing the mold 1 day later, and carrying out standard maintenance so as to obtain the alkali-activated quick repair material. The alkali-activated quick repair material is compact, reduces the proportion of pores with the size of less than 25 mm, reduces the shrinkage, further improves the compressive strength, and is short in setting time and excellent in comprehensive performance.
Description
technical field [0001] The invention belongs to the technical field of alkali-activated materials, and in particular relates to a low-shrinkage and fast-setting coal gangue base-activated rapid repair material and a preparation method thereof. Background technique [0002] Alkali-activated materials (AAM) refer to a new type of cementitious material, which is prepared from pozzolanic active materials, and has high early strength and good durability. A large amount of environmental pollution caused by the massive accumulation of waste coal gangue, such as land occupation, leaching of harmful elements, CO x , SO x , NO x Issues such as pollutant gas emissions. Although coal gangue has been used in the production of lightweight aggregates and bricks, coal gangue also has the potential to replace cement. When coal gangue is calcined at a high temperature of about 550-750°C, the kaolinite in its composition will be transformed into amorphous metakaolinite, showing good pozzol...
Claims
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IPC IPC(8): C04B28/06C04B111/72
CPCC04B28/06C04B2111/0075C04B2111/72C04B2201/05C04B2201/52C04B18/12C04B18/141C04B22/062C04B12/04
Inventor 水中和刘潮高旭
Owner WUHAN UNIV OF TECH