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Lime-metakaolin modified soil and application thereof

A metakaolin and metakaolin technology, which is applied in the field of lime-metakaolin modified soil, can solve the problems of high cost, low import price, and increase the restoration cost of earth building sites, and achieve the effect of low cost and insignificant color change.

Pending Publication Date: 2019-12-10
ZHONGYUAN ENGINEERING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are relatively few domestic studies on hydraulic lime and the import price is expensive, which greatly increases the restoration cost of earthen architectural sites.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A lime-metakaolin modified soil, comprising 8% of quicklime powder, 4% of metakaolin, and 88% of soil material, wherein the moisture content of the soil material is less than 1%, and the particle size of the soil material is ≤2mm, wherein 0.075-2mm The particle mass content of particle size does not exceed 60%.

[0030] The performance of the lime-metakaolin of embodiment 1 is tested, and step is as follows:

[0031] (1) Carry out compaction test to the lime-metakaolin modified soil of embodiment 1, obtain optimum water content and maximum dry density, be respectively 1.863%, 11.4g / cm 3 ;

[0032] (2) According to the determined optimal water content and maximum dry density, make six lime-metakaolin modified soil 50mm×50mm cylindrical samples, and then put the samples into a constant temperature and humidity box (temperature is 20°C ± 2°C , humidity ≥ 95%) for wet curing, referring to the "Highway Engineering Inorganic Binder Stable Material Test Procedures" (JTG E51-...

Embodiment 2

[0034] A lime-metakaolin modified soil, comprising 8% of quicklime powder, 8% of metakaolin, and 84% of soil material, wherein the moisture content of the soil material is less than 1%, and the particle size of the soil material is ≤2mm, wherein 0.075-2mm The particle mass content of particle size does not exceed 60%.

[0035] According to the method of Example 1, the performance test of the lime-metakaolin modified soil in Example 2 was carried out. As a result, the compressive strength of the lime-metakaolin modified soil reached 9.52 MPa after 28 days of curing.

Embodiment 3

[0037] A lime-metakaolin modified soil, comprising 8% quicklime powder, 12% metakaolin, and 80% soil material, wherein the moisture content of the soil material is less than 1%, and the particle size of the soil material is ≤2mm, wherein 0.075-2mm The particle mass content of particle size does not exceed 60%.

[0038] According to the method of Example 1, the performance test of the lime-metakaolin modified soil in Example 3 was carried out. As a result, the compressive strength of the lime-metakaolin modified soil reached 10.61 MPa after curing for 28 days.

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Abstract

The invention discloses lime-metakaolin modified soil and application thereof, and relates to the technical field of soil architecture site restoration. The lime-metakaolin modified soil provided by the invention is prepared from the following components in percentage by mass: 8-12% of quicklime powder, 4-12% of metakaolin, and the balance of a soil material. The lime-metakaolin modified soil provided by the invention is a natural inorganic material, the good compatibility of traditional lime mortar is retained, the hydraulicity of hydraulic lime is achieved, after curing for 28 days, a compressive strength value of the lime-metakaolin modified soil can meet the compressive strength class requirements for natural hydraulic lime NHL5, the color change is not obvious, the cost is low, the economical efficiency and environmental protection are achieved, and the significant advantages are achieved in application of restoration and reinforcement of soil architecture sites.

Description

technical field [0001] The invention relates to the technical field of repairing earth building ruins, in particular to a lime-metakaolin modified soil and an application thereof. Background technique [0002] Affected by materials and natural environmental factors, the overall preservation status of earth building sites is not optimistic. Moreover, the protection of earth building sites is a worldwide problem, and it is the most difficult category of cultural relics to preserve. [0003] In the restoration process of earthen building sites, lime mortar, which is widely used, has good compatibility with ancient geotechnical structures, but it has a slow hardening speed and insufficient strength, and is not suitable for humid environments due to lack of hydraulicity. In recent years, natural hydraulic lime (Natural Hydraulic Lime, abbreviated as NHL) has been gradually introduced to repair earthen building sites. After contacting with water, the hydraulic lime will undergo a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/34
CPCC04B7/34
Inventor 李新明任克彬尹松路广远刘彭彭付英杰白林杰张浩扬王玉隆
Owner ZHONGYUAN ENGINEERING COLLEGE
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