阅读说明：本技术 一种石灰-偏高岭土改性土及其应用 (lime-metakaolin modified soil and application thereof ) 是由 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 于 2019-10-16 设计创作，主要内容包括：本发明提供了一种石灰-偏高岭土改性土及其应用,涉及土建筑遗址修复技术领域。本发明提供的石灰-偏高岭土改性土包括以下质量百分含量的组分：生石灰粉8～12％；偏高岭土4～12％；土料余量。本发明提供的石灰-偏高岭土改性土为天然无机材料,既保留了传统石灰砂浆良好的兼容性,又具有水硬性石灰的水硬性,在养护28d后,其抗压强度值可达到天然水硬性石灰NHL5的抗压强度等级要求,且颜色变化不明显,成本低、经济环保,在对土建筑遗址进行修复与加固的应用中具有显著的优势。(The invention provides lime-metakaolin modified soil and application thereof, and relates to the technical field of restoration of civil sites. The lime-metakaolin modified soil provided by the invention comprises the following components in percentage by mass: 8-12% of quicklime powder; 4-12% of metakaolin; and (5) the balance of soil materials. The lime-metakaolin modified soil provided by the invention is a natural inorganic material, not only maintains the good compatibility of the traditional lime mortar, but also has the hydraulicity of hydraulic lime, after being cured for 28 days, the compressive strength value of the lime-metakaolin modified soil can reach the compressive strength grade requirement of natural hydraulic lime NHL5, the color change is not obvious, the cost is low, the lime-metakaolin modified soil is economic and environment-friendly, and the lime-metakaolin modified soil has obvious advantages in the application of repairing and reinforcing the historic sites of the civil buildings.)

1. The lime-metakaolin modified soil is characterized by comprising the following components in percentage by mass:

8-12% of quicklime powder;

4-12% of metakaolin;

And (5) the balance of soil materials.

2. the lime-metakaolin modified soil as claimed in claim 1, wherein the particle size of the soil material is less than or equal to 2mm, and the mass content of particles with the particle size of 0.075-2 mm is not more than 60%.

3. The lime-metakaolin modified soil according to claim 1 or 2, wherein the moisture content of the soil material is less than 1%.

4. The lime-metakaolin modified soil of claim 1, wherein the particle size of the quicklime powder is no greater than 0.45 mm.

5. The lime-metakaolin modified soil according to claim 1 or 4, wherein the water content of the quicklime powder is less than or equal to 0.1%.

6. the lime-metakaolin modified soil as claimed in claim 1, wherein the mass percentage content of calcium oxide in the quicklime powder is 75-100%.

7. The lime-metakaolin modified soil according to claim 1, wherein the metakaolin contains 50 to 60 mass% of silicon dioxide and 40 to 50 mass% of aluminum oxide.

8. The application of the lime-metakaolin modified soil of any one of claims 1 to 7 in the field of restoration and reinforcement of civil sites.

Technical Field

The invention relates to the technical field of restoration of civil sites, in particular to lime-metakaolin modified soil and application thereof.

Background

The earthen architecture site is influenced by materials and natural environment factors, the whole storage condition is not optimistic, and the protection of the earthen architecture site is a worldwide difficult problem which is the most difficult to store in site cultural relics.

In the process of repairing the site of the civil building, the widely applied lime mortar has good compatibility with the ancient geotechnical structure building, but has slow hardening speed and insufficient strength, and is not suitable for the humid environment due to lack of hydraulicity. In recent years, Natural Hydraulic Lime (NHL) has been gradually introduced for repairing the site of a civil structure, the Hydraulic Lime rapidly solidifies after contacting water, the early strength rapidly increases, and the generated air hardening process has a good self-repairing effect, so that the strength gradually increases. The process makes the hydraulic lime porous, and makes it possess high water and gas permeability and high performance compatibility with the repaired object. However, the domestic research of the hydraulic lime is relatively less and the import price is expensive, thereby greatly increasing the repair cost of the historic building site.

Therefore, the development of a low-cost repair material capable of replacing natural hydraulic lime has important significance for repairing the historic site of the civil building.

Disclosure of Invention

In view of the above, the present invention aims to provide a lime-metakaolin modified soil and an application thereof. After the lime-metakaolin modified soil provided by the invention is cured for 28 days, the compressive strength value can reach the compressive strength grade requirement of natural hydraulic lime NHL5, so that the lime-metakaolin modified soil can be used for replacing hydraulic lime to repair and reinforce the site of a civil construction, and the lime-metakaolin modified soil is cost-saving, environment-friendly and economical.

in order to achieve the above purpose, the invention provides the following technical scheme:

The invention provides lime-metakaolin modified soil which comprises the following components in percentage by mass:

8-12% of quicklime powder;

4-12% of metakaolin;

And (5) the balance of soil materials.

Preferably, the particle size of the soil material is less than or equal to 2mm, wherein the mass content of particles with the particle size of 0.075-2 mm is not more than 60%.

preferably, the moisture content of the soil material is less than 1%.

Preferably, the particle size of the quicklime powder is less than or equal to 0.45 mm.

Preferably, the water content of the quicklime powder is less than or equal to 0.1 percent.

Preferably, the mass percentage of the calcium oxide in the quicklime powder is 75-100%.

Preferably, the metakaolin contains 50-60% of silicon dioxide and 40-50% of aluminum oxide by mass.

The invention provides application of the lime-metakaolin modified soil in the scheme in the field of repairing and reinforcing civil sites.

The invention provides lime-metakaolin modified soil which comprises the following components in percentage by mass: 8-12% of quicklime powder; 4-12% of metakaolin; and (5) the balance of soil materials. The lime-metakaolin modified soil provided by the invention is a natural inorganic material, not only maintains the good compatibility of the traditional lime mortar, but also has the hydraulicity of hydraulic lime, after being cured for 28 days, the compressive strength value of the lime-metakaolin modified soil can reach the compressive strength grade requirement of natural hydraulic lime NHL5, the color change is not obvious, the cost is low, the lime-metakaolin modified soil is economic and environment-friendly, and the lime-metakaolin modified soil has obvious advantages in the application of repairing and reinforcing the historic sites of the civil buildings.

Detailed Description

The invention provides lime-metakaolin modified soil which comprises the following components in percentage by mass:

8-12% of quicklime powder;

4-12% of metakaolin;

And (5) the balance of soil materials.

The lime-metakaolin modified soil provided by the invention comprises 8-12% of quicklime powder, preferably 8-11% and more preferably 9-10% by mass. In the present invention, the particle size of the quicklime powder is preferably 0.45mm or less, more preferably 0.35mm or less; the water content of the quicklime powder is preferably less than or equal to 0.1 percent. In the invention, the mass percentage of the calcium oxide in the quicklime powder is preferably 75-100%. The method has no special requirement on the source of the quicklime powder, and a commercial product is adopted.

The lime-metakaolin modified soil provided by the invention comprises, by mass, 4-12% of metakaolin, preferably 5-10%, and more preferably 8-9%. In the invention, the mass percentage of silicon dioxide in the metakaolin is preferably 50-60%, and the mass percentage of aluminum oxide is preferably 40-50%. The source of the metakaolin is not particularly required, and a product sold in the market can be adopted.

The lime-metakaolin modified soil provided by the invention comprises the balance of soil materials in percentage by mass. In the invention, the grain size of the soil material is preferably less than or equal to 2mm, wherein the mass content of the grains with the grain size of 0.075-2 mm is preferably not more than 60%; the moisture content of the soil material is preferably less than 1%. In a specific embodiment of the invention, the soil material is taken from the south of Henan.

the invention provides application of the lime-metakaolin modified soil in the scheme in the field of repairing and reinforcing civil sites. The lime-metakaolin modified soil provided by the invention is a natural inorganic material, not only maintains good compatibility of lime mortar, but also has hydraulic property of hydraulic lime, after being maintained for 28 days, the compressive strength value of the lime-metakaolin modified soil can reach the compressive strength grade requirement of natural hydraulic lime NHL5, the color change is not obvious, the cost is low, the lime-metakaolin modified soil is economic and environment-friendly, and the lime-metakaolin modified soil has obvious advantages in the application of repairing and reinforcing the historic sites of the civil buildings.

The lime-metakaolin modified soil and the application thereof provided by the present invention will be described in detail with reference to the following examples, which should not be construed as limiting the scope of the present invention.