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Road roadbed material containing municipal sludge residues

A technology of municipal sludge and roadbed materials, applied in the field of road engineering materials, can solve problems such as high cost and unfriendly source environment, achieve high compressive strength, reduce road construction budget, and realize the effect of recycling

Inactive Publication Date: 2019-07-09
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the roadbed materials used in the current road construction process, such as concrete, gravel, or notoginseng ash, have high costs and are not environmentally friendly.

Method used

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  • Road roadbed material containing municipal sludge residues
  • Road roadbed material containing municipal sludge residues
  • Road roadbed material containing municipal sludge residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The municipal sludge sludge cake is firstly manually removed from solid impurities, dried in an oven at 105°C to constant weight, taken out, crushed and sieved to obtain pretreated municipal sludge, and then placed in an inert gas atmosphere at 900°C Municipal sludge residue was obtained after pyrolysis for 1 hour.

[0027] Select 50 kg of medium-sized municipal sludge particle residues and 10 kg of quicklime, add them to a mixer, and add 12.5 kg of water, and stir to obtain a road subgrade material containing municipal sludge.

[0028] It is measured that the loss on ignition of the municipal sludge residue is 6.5% to 7.5%, and the road subgrade material obtained in this embodiment does not contain microorganisms such as pathogenic bacteria, and the heavy metal content meets the "Soil Environmental Quality Standard (GB15618-1995)" Grade III or above is required.

Embodiment 2

[0030] After the municipal sludge sludge cake is manually removed from solid impurities, it is dried in an oven at 105°C to a constant weight, taken out, crushed and sieved to obtain pretreated municipal sludge, and then placed in an inert gas atmosphere at 300°C Municipal sludge residue was obtained after pyrolysis for 4 hours.

[0031] Select 60 kg of medium-sized municipal sludge particle residue, 24 kg of sand, 6.4 kg of quicklime, 20 kg of cement and add 40 kg of water into the mixer, and mix well to obtain a road subgrade material containing municipal sludge. The sand is medium-coarse sand, and the cement is slag cement grade 32.5.

[0032] It is measured that the loss on ignition of the municipal sludge residue is 6.5% to 7.5%, and the road subgrade material obtained in this embodiment does not contain microorganisms such as pathogenic bacteria, and the heavy metal content meets the "Soil Environmental Quality Standard (GB15618-1995)" Grade III or above is required.

Embodiment 3

[0034] After the municipal sludge sludge cake is manually removed from solid impurities, it is dried in an oven at 105°C to a constant weight, taken out, crushed and sieved to obtain pretreated municipal sludge, and then heated at 600°C under an inert gas atmosphere. After pyrolysis for 2 hours, municipal sludge residue was obtained.

[0035] Select 50 kg of medium-sized municipal sludge particle residue, 20 kg of sand, 10 kg of quicklime, and 10 kg of cement and add them to the mixer, and add 30 kg of water, and mix well to obtain a road subgrade material containing municipal sludge. The sand is medium-coarse sand, and the cement is slag cement grade 32.5.

[0036] The obtained road subgrade materials were tested for performance, and the test results are shown in Table 1.

[0037] Table 1

[0038]

[0039] It is measured that the loss on ignition of the municipal sludge residue is 6.5% to 7.5%, and the road subgrade material obtained in this embodiment does not contain m...

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Abstract

The invention discloses a road roadbed material containing municipal sludge residues. The road roadbed material comprises gel materials and auxiliary materials, wherein the gel materials comprise, inpercent by mass, 75-100% of the municipal sludge residues and 0-25% of cement, and the auxiliary materials comprise 0-30% of sand, 8-20% of lime and 25-50% of water based on the mass percentages of the components of the auxiliary materials in the total mass of the gel materials. The municipal sludge residues are prepared through the step of performing pyrolysis on pretreated municipal sludge in anitrogen atmosphere at 300-900 DEG C so that the municipal sludge residues are obtained. The prepared roadbed material can be applied to road construction, the road quality is improved, and meanwhilethe budget of road construction is reduced; and furthermore, a new way is provided for resource recycled utilization of an increasing amount of municipal sludge, so that waste recycled utilization isachieved, and the living environment is protected.

Description

[0001] Technical field: [0002] The invention relates to the technical field of road engineering materials, in particular to a road subgrade material containing municipal sludge residue. [0003] Background technique: [0004] The total mileage of my country's highways continues to grow rapidly with the rapid development of the social economy, and there is a huge demand for roadbed materials every year. Moreover, the roadbed materials used in the current road construction process, such as concrete, gravel, or notoginseng ash, have high costs and are not environmentally friendly. [0005] The discharge of domestic sewage in major cities in my country has increased at an annual growth rate of more than 5.3% since 2010. In 2016, the discharge of domestic sewage reached 17.684 billion tons. According to the estimate of 0.3%, the output of municipal sludge is about 53.05 million tons. The daily output of municipal sludge sludge cake is huge, and the sludge cake contains a large a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/10
CPCC04B28/10C04B2201/20C04B2201/50C04B14/06C04B18/0418C04B7/14
Inventor 袁浩然吴佳欢顾菁陈勇
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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