Lime-fly ash macadam waste recycling method

A technology for ash and crushed stone and waste, which is applied in the field of recycling of ash and crushed stone waste, can solve the problems of single recycling method, underutilized, low recycling utilization rate, etc. Simple and cost saving effect

Inactive Publication Date: 2020-10-09
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the regeneration and utilization of fly ash and crushed stone waste is single, and the recycling rate is low. Its recycling is mainly to form recycled graded crushed stone, mixed with a certain proportion of cementing material, through in-situ cold regeneration or factory-mixed cold regeneration. Preparation of mix for use as a pavement structure semi-rigid base or subbase
However, this kind of recycling design often adopts empirical methods, and the strength of the obtained mixture is low, so it can only be used as the base or sub-base of low-grade roads
In addition, the regenerated aggregate of fly ash gravel waste has a surface covered with mortar, and the content of lime and fly ash in the mortar is relatively high, but the existing recycling has not fully utilized this feature

Method used

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  • Lime-fly ash macadam waste recycling method
  • Lime-fly ash macadam waste recycling method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] According to the following process, the regenerated coarse aggregate of fly ash and crushed stone waste is produced:

[0031] (1) Collect the fly ash and gravel waste generated in the project and transport them to the crushing and processing site in a centralized manner;

[0032] (2) Use the crawler chassis to move the impact crushing equipment to carry out head crushing on the imported fly ash gravel waste materials, and the materials after head crushing are screened through the screen to sort different particle sizes, and at the same time screen out the steel bars that may be contained and other pollutants;

[0033] (3) Perform secondary crushing on the materials that do not pass through the set maximum size screen during the head crushing process, until all the fly ash and gravel wastes meet the particle size requirements;

[0034] (4) Mix fly ash crushed stone wastes with different particle sizes according to a certain ratio to obtain regenerated coarse aggregate o...

Embodiment 2

[0046] According to the process of embodiment 1, the regenerated coarse aggregate of waste limestone gravel is produced, and the recycled coarse aggregate of waste limestone gravel of required particle gradation is obtained, and its specific particle gradation is shown in the following table:

[0047] Table 2 Grading of recycled coarse aggregate from fly ash gravel waste

[0048] Square hole sieve size(mm) 2.36 4.75 9.5 16 19 26.5 31.5 Cumulative sieve residue (by mass) (%) 100 100 90 70 40 5 100

[0049] Mix the raw materials according to the following steps:

[0050] (1) Sieve the natural aggregate, and prepare it into the same gradation as the regenerated coarse aggregate of fly ash crushed stone waste;

[0051] (2) after immersing the regenerated coarse aggregate of fly ash gravel waste in water for 24 hours, air-dry the free water on the surface to obtain saturated surface-dried fly ash gravel waste;

[0052] (3) Weigh 5.1 parts of the a...

Embodiment 3

[0058] According to the process of embodiment 1, the regenerated coarse aggregate of waste limestone gravel is produced, and the recycled coarse aggregate of waste limestone gravel of required particle gradation is obtained, and its specific particle gradation is shown in the following table:

[0059] Table 3 Grading of recycled coarse aggregate from fly ash gravel waste

[0060] Square hole sieve size(mm) 2.36 4.75 9.5 16 19 26.5 31.5 Cumulative sieve residue (by mass) (%) 95 90 70 50 25 0 0

[0061] Mix the raw materials according to the following steps:

[0062] (1) Sieve the natural aggregate, and prepare it into the same gradation as the regenerated coarse aggregate of fly ash crushed stone waste;

[0063] (2) after immersing the regenerated coarse aggregate of fly ash gravel waste in water for 24 hours, air-dry the free water on the surface to obtain saturated surface-dried fly ash gravel waste;

[0064] (3) Weigh 7.8 parts of the above...

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Abstract

The invention discloses a lime-fly ash macadam waste recycling method, which comprises the following steps: (1) screening lime-fly ash macadam waste and natural aggregate, and synthesizing required gradation; (2) soaking the lime-fly ash waste recycled coarse aggregate in water for 24-28 hours, and air-drying free water on the surface to obtain saturated surface dry lime-fly ash waste recycled aggregate; (3) weighing 3.9-7.8 parts of lime-fly ash gravel waste recycled coarse aggregate, 5.2-9.1 parts of natural aggregate and 6.5-7.5 parts of medium sand, and uniformly mixing the components; (4)weighing 0.5-0.7 part of water, pouring into a mixing container, and mixing with the product obtained in the step (3) for 50-60 seconds; (5) adding 2.8-3.6 parts of cement into the mixture obtained in the step (4), and mixing the components for 30-40 seconds; and (6) pouring 0.5-0.8 part of water, continuously mixing the components for 110-120 seconds, and maintaining the mixture to obtain the lime-fly ash gravel waste recycled concrete. According to the lime-fly ash gravel waste recycled concrete prepared by the method, the strength can reach C50, the strength requirements of most concrete components are met, the application limitation of the original lime-fly ash gravel waste is broken through, and the utilization way is broadened.

Description

technical field [0001] The invention relates to the field of engineering materials, in particular to a method for recycling fly ash gravel waste. Background technique [0002] In recent years, my country's highways have entered a period of major repairs and major changes. A considerable number of highways can no longer meet the requirements of rapid growth in traffic volume, and urgently need reconstruction and expansion to improve their service capabilities. Due to the advantages of high strength and high rigidity, semi-rigid lime-fly ash macadam base has been widely used in highway engineering. Therefore, a large amount of lime-fly ash macadam waste is produced in highway reconstruction and expansion projects. In addition to a small part of our country's fly ash and gravel waste being used, most of it is untreated and directly transported to the outer suburbs for stacking or landfilling as construction waste. This not only consumes a lot of land resources and high processi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B20/02
CPCC04B20/02C04B20/026C04B28/04C04B18/167C04B14/02C04B14/06
Inventor 朱志铎康转转霍王文张杰万瑜赵文政姚凯王朋胡乐乐
Owner SOUTHEAST UNIV
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