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Early-strength soil solidifying agent and manufacturing method and application for same

A soil curing agent and early-strength technology, applied in chemical instruments and methods, applications, soil protection, etc., can solve the problems of low early strength of solidified silt, long sludge treatment time, etc. The effect of reducing and reducing permeability

Inactive Publication Date: 2013-09-11
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] On the other hand, in the dredging of waterways and water channels and the construction and expansion of ports, a large amount of dredging silt is usually produced, and the use of existing soil curing agents to treat silt will cause the sludge to be treated due to the low early strength of the solidified silt. It takes a long time, so a large number of land mud storage yards need to be set up

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] First prepare the soil stabilizer: the weight ratio of overburned magnesia and potassium dihydrogen phosphate is 1.18, that is, the ratio of the amount of magnesium in the overburned magnesia to the amount of phosphorus in potassium dihydrogen phosphate is 4, and the boric acid content It is 4% of the mass of perburned magnesium oxide, and the three are mixed uniformly.

[0032] Add water to dissolve, the water to be added is 18% of the sum of the solid mass of potassium dihydrogen phosphate and perburned magnesium oxide, and stir evenly.

[0033] Then pour the soil and curing agent into the mixer, the content of the curing agent is about 15% of the weight of the soil, after stirring evenly, according to the requirements of the geotechnical test specification, the sludge is made into a diameter of 3.91cm and a height of 8cm After the sample preparation is completed, it is placed in the curing room, demoulded after five hours, the measured unconfined compressive strength...

Embodiment 2

[0035] On the basis of Example 1, only the weight ratio of curing agent to contaminated soil was adjusted to 20%, the unconfined compressive strength of the obtained sample block was about 320kPa, and the pH value of the consolidated soil was 9-10. The concentration of the heavy metal leach solution meets the specification of GB 5085.3-2007 "Identification Standards for Hazardous Wastes - Identification of Leaching Toxicity".

Embodiment 3

[0037] On the basis of Example 1, the weight ratio of overburned magnesium oxide and potassium dihydrogen phosphate is adjusted to 1.1, that is, the ratio of the amount of magnesium in the overburned magnesium oxide to the amount of phosphorus in potassium dihydrogen phosphate is 3.74, the unconfined compressive strength value of the obtained sample block is about 250kPa, and the pH value of the solidified soil is 9-10. The concentration of the heavy metal leach solution meets the specification of GB 5085.3-2007 "Identification Standards for Hazardous Wastes - Identification of Leaching Toxicity".

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PUM

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Abstract

The invention relates to a solidifying agent capable of solidifying and stabilizing soil with poor mechanical properties, in particular to an early-strength solidifying agent and a manufacturing method and application for the same. The early-strength solidifying agent is capable of quickly improving the strength of soil and comprises phosphate and overburnt magnesium oxide. A ratio of the quantity of magnesium substances in the overburnt magnesium oxide to the quantity of phosphorus substances in the phosphate is 0.85-4. Proportion quantities of raw materials are uniformly stirred during usage, so that the powdery solidifying agent is formed. The soil solidifying agent not only can be applied to soil polluted by heavy metal, but also can be applied to dredging silt. The soil solidifying agent, the manufacturing method and the application have the advantages that the early strength of the soil can be quickly improved, the permeability is degraded, the pH (potential of hydrogen) can be regulated, and a suitable solidifying and stabilizing environment is created for the heavy metal.

Description

technical field [0001] The invention relates to a curing agent for curing and stabilizing soil with poor mechanical properties, in particular to an early-strength curing agent capable of rapidly improving soil strength, a preparation method and application thereof. Background technique [0002] Soil stabilizer is a material that can significantly improve the mechanical properties of soil at room temperature. The existing soil curing agent is formed by simply mixing cement, lime, fly ash and other materials. Although this soil stabilizer is easy to obtain materials, the early strength of the stabilized soil is low and the impermeability is poor. In addition, different heavy metals in soil require different pH values ​​for optimal stabilization. For example, the optimal solidification and stable pH value of heavy metal copper (Cu) is about 7, while the optimal solidification and stable pH value of heavy metal lead (Pb) is about 10, while Existing soil stabilizers cannot adju...

Claims

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Application Information

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IPC IPC(8): C09K17/02E02D3/12B09C1/08C09K103/00
Inventor 王哲周阳敏陈晓庆雍思明施维陈醒
Owner ZHEJIANG UNIV OF TECH
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