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Stabilized soil of regenerated building residue and lime and its preparation process

A technology for stabilizing soil with lime and slaked lime, which is applied in the directions of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of high cost of inorganic binders, waste of energy, waste of resources, etc., and is beneficial to ecological and environmental protection. , the effect of reducing land and transportation, saving resources and energy

Active Publication Date: 2010-08-18
南京都市废弃物综合利用开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the common method of disposing of house slag is landfill, which not only wastes resources, pollutes and damages the environment, but also occupies a large amount of land
[0003] In addition, because clay has the characteristics of poor water stability and large deformation, the use of clay to prepare the materials used for the road base and sub-base will make the road surface prone to cracking and displacement, which greatly shortens the service life of the road.
The commonly used method to improve the stability of soft soil subgrade is to use semi-rigid materials (inorganic binders), but some materials have very little hydraulic hardness and cannot really improve the stability of the subgrade, and the cost of inorganic binders prepared from natural aggregates is relatively high
[0004] Furthermore, the extensive use of clay leads to waste of land resources, waste of energy and environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The distribution of each group is as follows:

[0037] Recycled house slag aggregate:

[0038] 0~5mm: 2326g

[0039] 5~40mm: 1163g

[0040] Slaked lime: 278g

[0041] Clay: 872g

[0042] Water: 714g

[0043] The recycled house slag aggregate lime stabilized soil prepared according to the above ratio:

[0044] Best moisture content: 15.4%

[0045] Maximum dry density: 1.75g / cm 3

[0046] 7d unconfined compressive strength: 1.62MPa

[0047] (JTJ034-2000 technical specification for highway pavement base construction stipulates that the strength requirement of lime-stabilized soil at the sub-base of highways and first-class highways is ≥0.8MPa, while the strength requirement of lime-stabilized soil at the base of highways at and below the second grade is ≥0.8MPa)

[0048] The ratio of the average drying shrinkage coefficient after 7 days of curing to the lime soil with the same ratio: 1:4.96

[0049] Water Absorption: 17.47%

Embodiment 2

[0051] The distribution of each group is as follows:

[0052] Recycled house slag aggregate:

[0053] 0~5mm: 1926g

[0054] 5~40mm: 963g

[0055] Slaked lime: 459g

[0056] Clay: 1238g

[0057] Water: 759g

[0058] The recycled house slag aggregate lime stabilized soil prepared according to the above ratio:

[0059] Best moisture content: 16.55%

[0060] Maximum dry density: 1.73g / cm 3

[0061] 7d unconfined compressive strength: 1.53MPa

[0062] The ratio of the average drying shrinkage coefficient after 7 days of curing to the lime soil with the same ratio: 1:4.84

[0063] Water Absorption: 18.37%

Embodiment 3

[0065] The distribution of each group is as follows:

[0066] Recycled house slag aggregate:

[0067] 0~5mm: 2035g

[0068] 5~40mm: 1018g

[0069] Slaked lime: 278g

[0070] Clay: 1308g

[0071] Water: 754g

[0072] Special additives:

[0073] N a2 SO 4 : 1.4g

[0074] N a2 CO 3 : 1.4g

[0075] Regenerated house slag lime stabilized soil prepared according to the above ratio:

[0076] Best moisture content: 16.25%

[0077] Maximum dry density: 1.75g / cm 3

[0078] 7d unconfined compressive strength: 2.34MPa

[0079] The ratio of the average drying shrinkage coefficient after 7 days of curing to the lime soil with the same ratio: 1:4.62

[0080] Water Absorption: 18.17%

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Abstract

The stabilized soil consists of building residue as aggregate 50-80 wt%, slaked lime 4-20 wt% and clay 15-40 wt%, and has water in 15-20 wt% of the three above said materials and admixture in 0-2 wt% of slaked lime. The admixture is compounded with Na2SO4 in 40-60 wt% and Na2CO3 in 40-60 wt%. The stabilized soil has high strength, less dry shrinkage deformation and environment friendship, and maybe used in different road engineering.

Description

technical field [0001] The invention relates to recycled house slag lime stabilized soil and a preparation method thereof, belonging to the technical field of road building materials. Background technique [0002] The rapid growth of population and the development of urbanization have led to the rapid development of the construction industry in central cities. Every day, old buildings are torn down and demolished. The resulting construction waste is increasing, causing serious pollution to the urban living environment. At present, the common method of disposing of house slag is landfill, which not only wastes resources, pollutes and damages the environment, but also occupies a large amount of land. [0003] In addition, because clay has the characteristics of poor water stability and large deformation, the use of clay to prepare the materials used for the road base and sub-base will make the road surface prone to cracking and displacement, which greatly shortens the service ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B18/16C04B22/06C04B22/14C04B22/10
CPCY02W30/91
Inventor 沈庆利蒋林华肖玉明储洪强王正行
Owner 南京都市废弃物综合利用开发有限公司