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A highly active regeneration auxiliary cementitious material based on physical ball milling and nano-modification synergistically strengthened brick-concrete powder and its preparation method
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An auxiliary cementitious material and nano-modification technology, applied in cement production and other directions, can solve the problem of low activity of brick-mixed powder, and achieve the effect of strong permeability, high activity, and widening of the utilization surface.
Active Publication Date: 2021-11-23
ZHEJIANG UNIV
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[0006] The technical problem to be solved by the present invention is to provide a high activity regenerated auxiliary cementitious material based on physical ball milling and nano-modification synergistically strengthening brick-concrete powder and its preparation method for the defect of low activity of brick-concrete powder. The mixed powder is prepared into a highly active recycled auxiliary cementitious material, which significantly improves the utilization level of the brick-concrete powder and broadens its utilization area
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Embodiment 1
[0031] 1) Take each component by weight: 9900 brick mixed powder, 420 composite nano modifiers;
[0032] 2) Put the brick mixture and the composite nano modifier into the ball mill for 15 minutes, take out and seal it.
[0033] By the above method, regenerated auxiliary cement is obtained, replacing 30% cement mixed-type 20 × 20 × 20 mm standard consistency cement net paste test piece, after 1 day, after the mold is placed in standard maintenance chamber, temperature 20 ± 2 ° C, humidity ≥95 %. After the raging age, the compressive strength was measured for 3 days, 7 days and 28 days, and the strength of 25.6MPa, 39.3 MPa and 70.5MPa, respectively, with a cement net pulp intensity of 30% unopened brick-blended powder. 29.3. %, 12.9% and 19.5%.
Embodiment 2
[0035] 1) Take each component by weight: 9800 brick mixed powder, 530 composite nano modification agents;
[0036] 2) Put the brick mixture and the complex nano modifier into the ball mill for 20 minutes, take out and seal the treatment.
[0037] By the above method, regenerated auxiliary cement is obtained, replacing 30% cement mixed-type 20 × 20 × 20 mm standard consistency cement net paste test piece, after 1 day, after the mold is placed in standard maintenance chamber, temperature 20 ± 2 ° C, humidity ≥95 %. After the raging age, the compressive strength was measured for 3 days, 7 days, and 28 days of compressive strength of 26.3 mPa, 40.8 MPa and 71.0MPa, and the cement net pulp intensity of 30% unintered brick-blended powder was increased 32.8. %, 17.2% and 20.3%.
Embodiment 3
[0039] 1) Take each component by weight: 9,700 brick mixed powder, 640 composite nano modifiers;
[0040] 2) Put the brick mixture and the complex nano modifier into the ball mill for 20 minutes, take out and seal the treatment.
[0041] By the above method, regenerated auxiliary cement is obtained, replacing 30% cement mixed-type 20 × 20 × 20 mm standard consistency cement net paste test piece, after 1 day, after the mold is placed in standard maintenance chamber, temperature 20 ± 2 ° C, humidity ≥95 %. After 3 days, 7 days, 28 days of compressive strength was reached 26.9 MPa, 41.1 MPa and 71.5MPa, respectively, with a cement net pulp intensity of 30% unintered bricks, respectively, 35.9. %, 18.1% and 21.2%.
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Abstract
The invention discloses a highly active regenerated auxiliary cementitious material based on physical ball milling and nano-modification synergistically strengthened brick-concrete powder and a preparation method thereof. The method is as follows: selecting recycled brick-concrete powder with a particle size of less than 1.18 mm by screening Particles; then put the powder particles in a ball mill and add nano-SiO 2 Dispersion liquid, fiber, defoamer and polycarboxylate superplasticizer are the main components of the composite nano-modifier. After being fully ground, it is taken out and sealed, and the high activity of the brick-concrete powder is synergistically strengthened based on physical ball milling and nano-modification. Regenerate auxiliary gelling material. The invention fully considers the interaction relationship between the particle size of the recycled brick-concrete powder, the mechanical grinding time and the dosage of the composite nano-modifier, synergistically strengthens the recycled brick-concrete powder and obtains a highly active recycled auxiliary gelling material. The raw material of the method of the invention is easy to obtain, the cost is low, the modification method is simple and convenient, and the performance of the prepared regenerated auxiliary gelling material meets the requirements of practical engineering applications.
Description
Technical field [0001] The present invention relates to an auxiliary gelation material, and more particularly to a highly active regenerative auxiliary cementing material based on physical ball mill and nano-modified synergistic reinforced brick mixture and its preparation method thereof. Background technique [0002] Every year, my country has produced more than 3 billion tons of construction waste, and the deposits have more than 20 billion tons, while utilization is less than 10%. At the same time, the circulatory utilization of building waste is mostly concentrated in regenerative aggregates, and there are few research and applications for brick mixed powder recycling. In fact, the recycled aggregate is attached to a large amount of powder in the surface of the production and preparation, and its mass is about 5% to 25% of the regenerative aggregate mass. These powders affect both the performance of the regenerative aggregate and the high level of utilization, and will also c...
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Application Information
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