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Foam light soil and roadbed made from waste incineration fly ash

A technology of waste incineration fly ash and foam light soil, applied in the field of foam light soil, can solve the problems of limited application and promotion, high cost backfill, cost reduction, etc., and achieves the effect of cost reduction, easy recycling and good integrity

Active Publication Date: 2020-01-14
CCCC FOURTH HARBOR ENG INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the cost of foam lightweight soil is still a bit high compared with ordinary plain soil, sand, and stone backfill, which leads to certain restrictions on its application and promotion, and further cost reduction is needed

Method used

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  • Foam light soil and roadbed made from waste incineration fly ash
  • Foam light soil and roadbed made from waste incineration fly ash
  • Foam light soil and roadbed made from waste incineration fly ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This example is the formula example of foam lightweight soil, and its formula is as follows table 2:

[0026] Table 2

[0027]

[0028] Among them, the mass ratio of waste incineration fly ash to the cementitious material is 40%. The waterproofing agent is an emulsion of isooctyltriethoxysilane, and its dosage is 5% of the mass of the cementitious material. The air bubble rate is after the foam light soil is solidified. The cavities formed by the air bubbles account for the volume of the foamy light soil. After inspection, the wet density of the foam light soil produced by the application of waste incineration fly ash in this mix ratio is 584.1 (kg / m 3 ), the fluidity is 178mm, the 28-day compressive strength is 1.08MPa, and the water absorption rate is 0.2%. The mechanical properties can meet the requirements of CECS 249-2008 "Technical Regulations for Cast-in-place Foam Lightweight Soil" and general subgrade filling requirements.

Embodiment 2

[0030] This example is another formula example of foam light soil, and its formula is as follows Table 3:

[0031] table 3

[0032]

[0033] Among them, the replacement rate of cement by waste incineration fly ash is 30%. The waterproofing agent is sodium methyl silicate solution, and its dosage is 5% of the mass of the cementitious material. The foam made of waste incineration fly ash with this mixing ratio is tested to be light. Soil wet density is 559.4(kg / m 3 ), the fluidity is 176mm, the 28-day compressive strength is 1.35MPa, and the water absorption rate is 0.2%. The mechanical properties can all meet the requirements of CECS 249-2008 "Technical Regulations for Cast-in-place Foam Lightweight Soil" and general subgrade filling requirements.

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Abstract

The invention relates to foamed light soil prepared from waste incineration fly ash. According to the foamed light soil, firstly, waste incineration fly ash cement slurry is prepared from a cementing material containing waste incineration fly ash and cement, an internal doping type waterproof agent and water, then, foam is added to the waste incineration fly ash cement slurry through a foamed light soil automated machine, and a roadbed is formed after mixing, stirring, conveying by a tube, casting forming and curing, wherein the waste incineration fly ash accounts for 20%-40% of the cementing material, the cement accounts for 60%-80% of the cementing material, the internal doping type waterproof agent accounts for 1%-5% of the cementing material, and the water-cement ratio is 0.55-0.65. By means of the method, the cost of the foamed light soil is reduced by use of the waste incineration fly ash, and meanwhile, the problem of treatment of solid waste of the waste incineration fly ash produced after burning of urban waste is effectively solved. Besides, harmful substances in the waste incineration fly ash are effectively prevented from being dissolved out by use of the internal doping type organosilicon waterproof agent and the purpose of environment-friendly treatment of solid waste is achieved while the strength and the volume weight of the foam light soil meet engineering requirements.

Description

technical field [0001] The invention relates to the technical field of foam light soil, in particular to a foam light soil made from waste incineration fly ash. Background technique [0002] Waste incineration fly ash is the catch of the flue gas purification system and the bottom ash settled at the bottom of the flue and chimney during the municipal solid waste incineration and disposal process. Incineration fly ash contains harmful substances such as dioxins and heavy metals. According to the "Pollution Control Standards for Domestic Waste Incineration" (GB18485-2014): "Domestic waste incineration fly ash should be managed as hazardous waste." Therefore, waste incineration fly ash must be collected separately, and must not be mixed with domestic garbage, incineration residues, etc., or mixed with other hazardous waste. It is also required that waste incineration fly ash shall not be stored for a long time in the place where it is produced, shall not be disposed of simply,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B38/10E01C3/00
CPCC04B28/00C04B2201/50E01C3/003C04B22/002C04B18/08C04B24/42C04B38/106C04B38/0074C04B38/0067
Inventor 曾俊杰岑文杰王胜年熊建波范志宏
Owner CCCC FOURTH HARBOR ENG INST