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Carbonization and solidification method for soil

A solidification method and soil technology, applied in soil protection, infrastructure testing, construction, etc., to achieve the effect of reducing carbon dioxide emissions, carbon dioxide emissions and energy consumption

Active Publication Date: 2012-08-29
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the inventor has found through a large number of experiments that the activated magnesia solidified soil is easy to react (carbonize) with carbon dioxide, especially in a high-solubility, high-pressure carbon dioxide environment, the carbonization process will be within a few hours or even tens of minutes. complete, forming magnesium carbonates

Method used

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  • Carbonization and solidification method for soil
  • Carbonization and solidification method for soil
  • Carbonization and solidification method for soil

Examples

Experimental program
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Effect test

Embodiment 1

[0023] In this embodiment, it is an indoor test, mainly analyzing the feasibility of carbonization and solidification method and the influence of different carbonization time on the strength of carbonized soil. The soil to be solidified is sandy soil with a water content of 10%, the curing agent is active magnesium oxide, and the active magnesium oxide content (the ratio of active magnesium oxide to the total mass of soil and active magnesium oxide) is 10%. First mix the active magnesium oxide and the soil according to the design ratio, stir evenly, pour it into a standard mold with a diameter of 5 cm and a height of 10 cm, vibrate and compact it, and demould it after about half an hour, and install the sample on the On the three-axis permeameter, a confining pressure of 400kPa is applied, and then 200kPa of carbon dioxide gas is injected into the sample from the bottom for carbonization curing. The curing time is 45 minutes, 1.5 hours, 3 hours, 6 hours and 12 hours respectivel...

Embodiment 2

[0027] In this embodiment, it is a carbonized stirring pile test, the soil to be reinforced is dry sandy soil, the curing agent is activated magnesium oxide, and the mass ratio of activated magnesium oxide to dry soil is 10%. First use a small stirring pile machine 1 to stir in the soil and spray active magnesia slurry to form uncarbonized active magnesia solidified soil 3, and then use the stirring pile machine 1 to introduce carbon dioxide gas while stirring for carbonization. The specific construction see process image 3 , and introduced as follows:

[0028] (a) Arrange the stirring pile 1 above the natural soil 2 to be solidified, start the stirring pile 1, the stirring pile 1 sinks, stir and spray active magnesium oxide slurry at the same time, until the stirring blade reaches the design elevation of the bottom surface;

[0029] (b) Stirring pile driver 1 is lifted, while stirring and spraying active magnesium oxide slurry until the stirring blades reach the surface;

...

Embodiment 3

[0034] This embodiment is a carbonized stirring pile test, the soil to be reinforced is dry sandy soil, the curing agent is activated magnesia, and the mass ratio of activated magnesia to dry soil is 10%. First use a small-scale stirring pile machine 1 to stir in the soil, spray active magnesium oxide slurry to form uncarbonized active magnesium oxide to stir and solidify the soil 3, and then deploy a carbonization device to carry out carbonization through the carbonization device.

[0035] Carbonization device comprises carbon dioxide generator 7 and outer sleeve 5, is provided with the through hole 12 as carbon dioxide outlet on the tube wall of outer sleeve 5, is connected with carbon dioxide import pipe 6 on carbon dioxide generator 7 and the carbon dioxide on carbon dioxide generator 7 The gas outlet is connected with one end of the carbon dioxide introduction pipe 6, and the other end of the carbon dioxide introduction pipe 6 is located at the end of the outer sleeve 5. ...

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Abstract

The invention provides a carbonization and solidification method for soil. The method comprises the following steps of: uniformly agitating and mixing soil body which is required to be solidified and curing agent according to a mass ratio of (12-19):(8-1); introducing carbon dioxide gas into solidified soil, so that the solidified soil body is carbonized and formed into carbonate compound solidified soil, wherein the curing agent comprises active magnesium oxide. A device used for implementing soil carbonization and solidification comprises a carbon dioxide generator and a jacket pipe; a through hole used as carbon dioxide gas outlet is arranged in the pipe wall of the jacket pipe; a carbon dioxide guiding pipe is connected onto the carbon dioxide generator; and the carbon dioxide gas outlet in the carbon dioxide generator is connected with one end of the carbon dioxide guiding pipe; and the other end of the carbon dioxide guiding pipe is located in the jacket pipe; the carbon dioxide guiding pipe is sleeved with a sealing film; the sealing film is covered on the top of the jacket pipe and extends towards the outside of the jacket pipe; a gas sealing ring is arranged between the jacket pipe and the carbon dioxide guiding pipe, and the gas sealing ring is located at the top of the jacket pipe.

Description

[0001] The present invention is a divisional application with the title of "a soil carbonization and solidification method and its device", the filing date of "2010.12.24" and the application number of "201010604013.1". technical field [0002] The invention belongs to the technical field of civil engineering, and relates to a green, low-carbon, environment-friendly carbonization curing method and a device for curing soil. Background technique [0003] Curing is a common method to strengthen and improve the properties of soil. It uses various methods to stir and mix the curing agent with the soil, and to improve the physical and mechanical properties of the soil through the curing effect of the curing agent (such as the hydration of cement). Properties (water content, permeability, strength, modulus, etc.), so as to meet the needs of civil engineering. At present, the conventional soil curing agents are mainly cement and quicklime. Quicklime (GaO) is the main soil curing ag...

Claims

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Application Information

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IPC IPC(8): E02D3/12E02D33/00
Inventor 易耀林马丁·利什卡阿尔比·阿勒-塔瓦刘松玉
Owner SOUTHEAST UNIV
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