Preparation method of recycled aggregate, and dry-mixed mortar

A technology of recycled aggregate and dry-mixed mortar, applied in sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of low recovery rate of construction waste, low adhesive strength of mortar, and complicated pre-processes. Low dry shrinkage, sustainable development, and good workability

Inactive Publication Date: 2020-06-12
佛山市南海承骏科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The recovery rate of construction waste is low, and the pre-process is complicated and expensive, and the economic value is low
Moreover, due to the complex and diverse components of construction waste, there are a large number of organic materials such as bamboo, plastic, foam, and adhesives, which are difficult to combine with inorganic materials such as cement and sand, resulting in low bonding strength and low compressive strength in the prepared mortar. Poor, loose structure and other problems affect the use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1. Preparation of recycled aggregate

[0039] S1. The construction waste is crushed and refined repeatedly, and the particles with a diameter of less than 30mm are screened;

[0040] S2. Put the particles into the eddy current separator and the strong magnetic separator, remove the metal particles, and sort the coarse aggregate; the coarse aggregate is crushed and refined into fine aggregate with a diameter of 0.5-5mm, among which waste plastics, waste The total mass of bamboo wood and waste glass accounts for 20% of the mass of fine aggregate;

[0041] S3. The fine aggregate and the alcohol-diluted coupling agent vinyltriethoxysilane are fully stirred and mixed, and the amount of the coupling agent added is 0.8% of the mass of the fine aggregate; after the alcohol is completely volatilized, the surface coupling processed fine aggregate;

[0042] S4. The surface-coupling-treated fine aggregate is fully stirred and mixed with polyethylene glycol 4000 dissolved in clear...

Embodiment 2

[0047] 1. Preparation of recycled aggregate

[0048] S1. Repeatedly crush and refine the construction waste, and sieve to obtain particles with a diameter of less than 30mm;

[0049] S2. Put the particles into the eddy current separator and the strong magnetic separator, remove the metal particles, and sort the coarse aggregate; the coarse aggregate is crushed and refined into fine aggregate with a diameter of 0.5-5mm, among which waste plastics, waste The total mass of bamboo wood and waste glass accounts for 15% of the mass of fine aggregate;

[0050] S3. The fine aggregate is fully stirred and mixed with the coupling agent vinyltrimethoxysilane diluted with alcohol, and the amount of the coupling agent added is 0.45% of the mass of the fine aggregate; after the alcohol is completely volatilized, the surface coupling treatment is obtained fine aggregate;

[0051] S4. The surface-coupling-treated fine aggregate is fully stirred and mixed with polyethylene glycol 2000 dissol...

Embodiment 3

[0056] 1. Preparation of recycled aggregate

[0057] S1. Repeatedly crush and refine the construction waste, and sieve to obtain particles with a diameter of less than 30mm;

[0058] S2. Put the particles into the eddy current separator and the strong magnetic separator, remove the metal particles, and sort the coarse aggregate; the coarse aggregate is crushed and refined into fine aggregate with a diameter of 0.5-5mm, among which waste plastics, waste The total mass of bamboo wood and waste glass accounts for 25% of the mass of fine aggregate;

[0059] S3, the fine aggregate and the coupling agent vinyl tris (β-methoxyethoxy) silane diluted by alcohol are fully stirred and mixed, and the amount of the coupling agent added is 1.25% of the mass of the fine aggregate; after the alcohol is completely volatilized Finally, the fine aggregate treated with surface coupling is obtained;

[0060] S4. The surface-coupling-treated fine aggregate is fully stirred and mixed with polyethy...

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Abstract

The invention relates to a preparation method of recycled aggregate. The preparation method comprises the following steps: repeatedly crushing and refining construction waste, and screening to obtainparticles with the diameter of less than 30 mm; putting the particles into an eddy current sorting machine and a magnetic sorting machine, removing metal particles, and sorting to obtain coarse aggregate; crushing and refining the coarse aggregate into fine aggregate with the diameter of 0.5-5 mm; fully stirring and mixing the fine aggregate and a coupling agent diluted by alcohol, and enabling the alcohol to completely volatilize to obtain fine aggregate subjected to surface coupling treatment; and fully stirring and mixing the fine aggregate subjected to surface coupling treatment with polyethylene glycol dissolved in clear water, and heating and drying to obtain the recycled aggregate. The invention also relates to a dry-mixed mortar and a preparation method thereof. The construction waste is utilized, and waste is turned into valuables; and circular economy is developed, and sustainable development of the building mortar is realized.

Description

technical field [0001] The invention belongs to the field of solid waste treatment, and in particular relates to a preparation method of recycled aggregate and dry-mixed mortar. Background technique [0002] With the progress of society, the demolition of construction projects and the construction waste generated in the construction process are increasing significantly. Construction waste is mainly composed of muck, waste concrete, waste masonry, crushed stones, brick fragments, waste mortar, mud, asphalt blocks, waste plastics, waste metal, waste bamboo wood, waste glass, etc., with complex components. , Sorting and recycling is difficult and has low economic value, so it is mostly disposed of in landfill at present. [0003] With the increasing amount of construction waste, the pressure on landfills is also increasing. Presently, construction waste is used to prepare ready-mixed dry-mixed mortar. The recovery and reuse technology of construction waste in the prior art b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/16C04B20/12C04B28/02
CPCC04B18/16C04B20/12C04B28/02C04B2201/50C04B20/1051C04B20/1037C04B2103/0068Y02W30/91
Inventor 何礼俊陈楚芝
Owner 佛山市南海承骏科技有限公司
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