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Waste construction residue mud-based unfired early-strength lightweight aggregate and preparation method thereof

A technology of construction dregs and lightweight aggregates, which is applied in the field of recycling of construction waste resources, can solve the problems of long maintenance period, low resource conversion rate, and low efficiency, and achieve high energy consumption, large emissions, short cycle, and promotion The effect of green economic development

Pending Publication Date: 2022-02-25
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of waste construction dregs mud-based non-fired early-strength lightweight aggregate and its preparation method, which solves the problems of low efficiency, long maintenance period and low resource conversion rate faced by the traditional technology, and is very convenient. The earth is conducive to solid waste utilization and green sustainable development

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A waste construction residue mud-based non-fired early-strength lightweight aggregate and a preparation method thereof, the specific implementation is as follows:

[0036] (1) Construction dregs mud pretreatment;

[0037] After the extrusion dehydration process, the water content of the construction waste mud and waste mud (mass ratio: 1:1) is controlled at about 30% to obtain dehydrated construction waste mud as a raw material. The dried construction dregs mud is obtained by drying.

[0038] The dried construction dregs slurry is poured into the crusher, the crushing time is controlled within 3 minutes, and then passed through a 0.6mm mesh sieve to obtain the dried and ground construction dregs slurry raw material.

[0039] (2) Weighing and mixing of unfired early-strength lightweight aggregate components;

[0040] Weigh the dried and ground construction residue mud with a mass fraction of 70%, and 30% cement. Put each component into a mixer and dry mix for 1 minute...

Embodiment 2

[0049] A waste construction residue mud-based non-fired early-strength lightweight aggregate and a preparation method thereof, the specific implementation is as follows:

[0050] (1) Construction dregs mud pretreatment;

[0051] After the extrusion dehydration process, the water content of the construction waste mud and waste mud (mass ratio: 1:1) is controlled at about 30% to obtain dehydrated construction waste mud as a raw material. The dried construction dregs mud is obtained by drying.

[0052] The dried construction dregs slurry is poured into the crusher, the crushing time is controlled within 3 minutes, and then passed through a 0.6mm mesh sieve to obtain the dried and ground construction dregs slurry raw material.

[0053] (2) Weighing and mixing of unfired early-strength lightweight aggregate components;

[0054] Weigh 70% dried and ground construction residue mud, 10% cement, 11% S105 grade slag, 5% silica fume, and 4% fly ash. Put each component into a mixer and...

Embodiment 3

[0063] A waste construction residue mud-based non-fired early-strength lightweight aggregate and a preparation method thereof, the specific implementation is as follows:

[0064] (1) Construction dregs mud pretreatment;

[0065] After the extrusion dehydration process, the water content of the construction waste mud and waste mud (mass ratio: 1:1) is controlled at about 25% to obtain dehydrated construction waste mud as a raw material.

[0066] (2) Weighing and curing of non-fired early-strength lightweight aggregate components;

[0067] Take by weighing 70% dehydrated construction dregs mud, 10% cement, 12% S105 grade slag, 8% fly ash, and then weigh 12% silica fume of the dry weight of the construction dregs mud as an external admixture . Put each component into a mixer, the required amount of water is to remove 15% of the total material of silica fume mixed with the outside, after stirring for 3 minutes, pour it into a mold with a size of 100mm×100mm×10mm and solidify for...

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Abstract

The invention relates to a waste construction residue mud-based unfired early-strength lightweight aggregate and a preparation method thereof. The waste construction residue mud-based unfired early-strength lightweight aggregate is prepared from waste construction muck mud, an inorganic cementing material, an adhesive and water. The method comprises the following steps: pre-mixing and dry-mixing the residue mud subjected to moisture content pretreatment and an inorganic cementing material in a disc granulator according to a certain proportion, adding an adhesive and water into a mixture, uniformly stirring again, and preparing granular aggregate through a disc granulation process or a curing and crushing process; and curing the aggregate to obtain the waste construction residue mud-based unfired early-strength lightweight aggregate with early strength, light weight and low water absorption. The aggregate for the concrete is prepared by recycling the waste building residue soil generated by engineering construction, the production process is green and environment-friendly, and the product forming rate is high. The comprehensive utilization efficiency of the waste building resources can be effectively improved, the production cycle of the product can be greatly shortened, and the method is suitable for large-scale industrial production and application.

Description

technical field [0001] The invention belongs to the technical field of regeneration and utilization of construction waste resources, and relates to a non-burning early-strength lightweight aggregate based on waste construction dregs and mud and a preparation method thereof. Background technique [0002] With the continuous acceleration of the pace of urban infrastructure construction in my country, the construction of modern building structures produces a large amount of waste construction dregs and waste mud, which makes it difficult to digest and dispose of them, which seriously affects the safety of engineering construction and the green development of cities. The method of disposal of construction dregs and mud is mainly transportation and landfill, but the dregs and mud itself does not have hydration activity, and the resource utilization rate of its transformation into building materials is low. At the same time, with the depletion of natural aggregate river sand resou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/02
CPCC04B28/02C04B2201/20C04B2201/50C04B18/16C04B18/0418C04B18/141C04B18/08C04B18/146
Inventor 蒋正武钟翼进
Owner TONGJI UNIV
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