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High-activity regenerated auxiliary cementing material based on physical ball milling and nano-modification synergistic reinforced brick-concrete powder and preparation method thereof

An auxiliary cementitious material, nano-modification technology, applied in cement production and other directions, can solve the problem of low activity of brick-mixed powder, achieve the effect of strong permeability, reduce surface cracks, and improve technical performance

Active Publication Date: 2020-10-30
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[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

Method used

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  • High-activity regenerated auxiliary cementing material based on physical ball milling and nano-modification synergistic reinforced brick-concrete powder and preparation method thereof
  • High-activity regenerated auxiliary cementing material based on physical ball milling and nano-modification synergistic reinforced brick-concrete powder and preparation method thereof
  • High-activity regenerated auxiliary cementing material based on physical ball milling and nano-modification synergistic reinforced brick-concrete powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) Take each component by weight percentage: 9900 parts of brick-concrete powder, 420 parts of composite nano-modifier;

[0032] 2) Put the brick-concrete powder and composite nano-modifier into the ball mill for 15 minutes, take it out and seal it.

[0033] The regenerated auxiliary cementitious material was obtained by the above method, and it was mixed with 30% cement to form a 20×20×20mm standard consistency cement paste test piece. After 1 day, the formwork was removed and placed in a standard curing room with a temperature of 20±2°C and a humidity of ≥95. %. After reaching the curing age, the compressive strength measured at 3 days, 7 days, and 28 days was 25.6MPa, 39.3MPa, and 70.5MPa, respectively, which was 29.3% higher than that of the cement slurry mixed with 30% unreinforced brick-concrete powder. %, 12.9% and 19.5%.

Embodiment 2

[0035] 1) Take each component by weight percentage: 9800 parts of brick-concrete powder, 530 parts of composite nano-modifier;

[0036] 2) Put the brick-concrete powder and composite nano-modifier into the ball mill for 20 minutes, take it out and seal it.

[0037] The regenerated auxiliary cementitious material was obtained by the above method, and it was mixed with 30% cement to form a 20×20×20mm standard consistency cement paste test piece. After 1 day, the formwork was removed and placed in a standard curing room with a temperature of 20±2°C and a humidity of ≥95. %. After reaching the curing age, the compressive strength measured at 3 days, 7 days, and 28 days was 26.3MPa, 40.8MPa, and 71.0MPa, respectively, which was 32.8% higher than that of the cement slurry mixed with 30% unreinforced brick-concrete powder. %, 17.2% and 20.3%.

Embodiment 3

[0039] 1) Take each component by weight percentage: 9700 parts of brick-concrete powder, 640 parts of composite nano-modifier;

[0040] 2) Put the brick-concrete powder and composite nano-modifier into the ball mill for 20 minutes, take it out and seal it.

[0041] The regenerated auxiliary cementitious material was obtained by the above method, and it was mixed with 30% cement to form a 20×20×20mm standard consistency cement paste test piece. After 1 day, the formwork was removed and placed in a standard curing room with a temperature of 20±2°C and a humidity of ≥95. %. After reaching the curing age, the compressive strength measured at 3 days, 7 days, and 28 days was 26.9MPa, 41.1MPa, and 71.5MPa, respectively, which was 35.9% higher than that of the cement slurry mixed with 30% unreinforced brick-concrete powder. %, 18.1% and 21.2%.

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Abstract

The invention discloses a high-activity regenerated auxiliary cementing material based on physical ball milling and nano-modification synergistic reinforced brick-concrete powder and a preparation method thereof. The method comprises the following steps of: carrying out screening to select regenerated brick-concrete powder particles with the particle size of less than 1.18mm; and putting the powder particles into a ball mill, adding a composite nano modifier taking a nano SiO2 dispersion liquid, fibers, a defoaming agent and a polycarboxylate superplasticizer as main components, fully grindingthe powder particles, taking out, and performing sealing to obtain the high-activity regenerated auxiliary cementing material based on the physical ball milling and nano modification synergistic reinforced brick-concrete powder. According to the method, the interaction relationship among the particle size of the recycled brick-concrete powder, the mechanical grinding time and the doping amount ofa composite nano modifier is fully considered, the regenerated brick-concrete powder is synergistically reinforced, and the high-activity regenerated auxiliary cementing material is obtained. According to the method, raw materials are easy to obtain, the cost is low, the modification method is simple and convenient, and the performance of the prepared regenerated auxiliary cementing material meets actual engineering application requirements.

Description

technical field [0001] The invention relates to an auxiliary cementing material, in particular to a highly active regenerated auxiliary cementing material based on physical ball milling and nano-modification synergistically reinforced brick-concrete powder and a preparation method thereof. Background technique [0002] Our country produces more than 3 billion tons of construction waste every year, and the stock over the years exceeds 20 billion tons, but the utilization rate is less than 10%. At the same time, the recycling of construction waste is mostly concentrated on recycled aggregates, and there are few researches and applications on the recycling of brick-concrete powder. In fact, during the production and preparation of recycled aggregate, a large amount of powder will adhere to the surface, and its mass accounts for about 5% to 25% of the recycled aggregate mass. These powders not only affect the performance and high-grade utilization of recycled aggregates, but al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/24C04B7/38C04B12/00C04B28/00
CPCC04B7/246C04B7/38C04B12/005C04B28/006C04B22/06C04B2103/50C04B2103/302C04B16/0641Y02P40/10
Inventor 孟涛洪永鹏应侃君韦华栋
Owner ZHEJIANG UNIV
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