Method of bitumen solidification for waste incineration slag aggregate

A technology for solidifying waste incineration slag and asphalt, which is applied in the field of resource utilization of solid waste, can solve the problems of high cost, difficult resource utilization of waste incineration slag, small solidification effect of soluble salt, etc., and achieves improved anti-rutting performance. , The effect of excellent road performance and improved water damage resistance

Inactive Publication Date: 2013-11-27
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the technology of chemical agent stabilization method is relatively simple, the cost is high and the curing effect on soluble salts is small
At the same time, the waste incineration slag solidified by the above method is difficult to be utilized as a resource, and landfill measures are still used for disposal

Method used

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  • Method of bitumen solidification for waste incineration slag aggregate
  • Method of bitumen solidification for waste incineration slag aggregate
  • Method of bitumen solidification for waste incineration slag aggregate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In this example, the performance of the waste incineration slag aggregate is tested. The crushing value and water absorption are shown in Table 1. The particle size distribution is shown in Table 2. As the mechanical properties of waste incineration slag aggregate increase with the stacking time, the mechanical properties of slag-asphalt mixture can be improved; with the stacking time, the water absorption rate of waste incineration slag aggregate decreases, and the adsorption of asphalt in slag-asphalt mixture decreases, which can reduce the mixing rate. It is beneficial to reduce the cost of the mixture by reducing the amount of asphalt in the material; with the stacking time, the slag aggregate particles will expand, resulting in a change in gradation. In order to ensure the performance of the slag-asphalt mixture, the slag aggregate needs to be stacked for a period of time before it is solidified with asphalt, and it is recommended to stack for more than 90 days fr...

Embodiment 2

[0026] In this example, the road performance of the waste incineration slag asphalt mixture is tested. Basalt aggregate with a maximum particle size of 19.5mm, ordinary 70# matrix asphalt and ordinary limestone filler are used. The mass ratios of waste incineration slag aggregates replacing basalt aggregates are 0, 10%, 20%, 30% and 40%, respectively. The method of solidifying asphalt waste incineration slag aggregate: it is composed of the following components in weight percentage: waste incineration slag aggregate 0~40%, stone 55~80%, mineral powder 4%~9% and asphalt, at 165 ℃ Stir for 90 seconds. According to the industry standard "Technical Specifications for Highway Asphalt Pavement Construction" (JTG F40-2004), the Marshall test method for asphalt mixture was used to determine the optimal amount of asphalt. The performance of the mixture is shown in Table 3.

[0027] Table 3 Performance parameters of asphalt mixture

[0028]

[0029] In summary, this example shows ...

Embodiment 3

[0031] In this example, the environmental impact of the slag asphalt mixture was tested from two aspects: the leaching amount of soluble salts and the acute biological toxicity.

[0032] The leaching amount of chloride salt of slag-asphalt mixture is 12-31g / L, the leaching amount of sulfate is 9-17g / L, and the leaching amount of soluble salt is significantly smaller than that of waste incineration slag. The electrical conductivity of the leaching solution of the slag aggregate is 9430 μS / cm; the electrical conductivity of the leaching solution of the slag-asphalt mixture is shown in Table 4. The electrical conductivity (<1000μS / cm) of the slag-asphalt mixture leaching solution is much smaller than that of the slag leaching solution, which indicates that asphalt has a stable and solidifying effect on pollutants in waste incineration slag aggregates, which can be explained from two aspects: asphalt is a hydrophobic substance , blocks the pores in the waste incinerator slag aggre...

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Abstract

The invention relates to a method of bitumen solidification for waste incineration slag aggregate, which is composed of the following components in parts by weight: 10-30% of waste incineration slag aggregate, 55-80% of aggregated rock, 4-9% of mineral powder, and 4.8-6.3% of bitumen, wherein each component is stirred and mixed for 85-95 seconds at the temperature of 160-170 DEG C. The method of the solidification for the waste incineration slag by using the bitumen is simple, the manufactured bituminous mixture has excellent pavement performance and can be used as a middle surface material of a high grade bituminous road, environmental effect is small, and a resource utilization way for the waste incineration slag is provided.

Description

technical field [0001] The invention relates to the field of resource utilization of solid waste, in particular to a method for solidifying waste incineration slag aggregates with asphalt. Background technique [0002] Waste incineration slag is the product of domestic waste incineration, specifically refers to the incineration residue remaining on the incinerator grate and the fine ash falling from between the grate, accounting for about 80% of the total waste incineration products, with the highest proportion. The physical composition of waste incineration slag mainly includes sintered slag, ceramics, glass and masonry, which has similar mechanical properties to natural stone and can be used as recycled aggregate. However, waste incineration slag has certain heavy metal elements and leaching toxicity of soluble salts, and its environmental impact needs to be considered in the process of resource utilization. [0003] At present, solidification methods are often used to re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B26/26C04B18/30
CPCY02W30/91
Inventor 李立寒刘栋崔华杰
Owner TONGJI UNIV
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