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Composite soil solidifying agent, and preparation and application thereof

A soil stabilizer and composite technology, applied in cement production, etc., can solve problems such as slow strength of solidified soil, water and soil pollution, and influence on construction progress, and achieve the effects of wide source of raw materials, simple manufacture, and convenient construction

Inactive Publication Date: 2014-02-05
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In long-term engineering practice, the use of lime, cement and other curing materials has exposed many problems: the strength of the solidified soil formed by lime and soil is slow, which affects the construction progress, and it shrinks greatly, is easy to soften, and has poor water stability; The maximum drying shrinkage achieved by air drying is 2780~3950
The preparation method of the curing agent is relatively complicated, the construction is inconvenient, and concentrated sulfuric acid is used, which is harmful to the human body and pollutes the water body and soil.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Preparation of curing agent: PO42.5 ordinary Portland cement 8.9g, slag (ground to a specific surface area of ​​300m 2 / kg) 46g, nickel slag (ground to a specific surface area of ​​300m 2 / kg) 19g, CaO26.1g, mix the raw materials evenly to prepare the soil stabilizer;

[0022] According to the above test procedure and strength determination method, the solidified soil sample was prepared and the unconfined compressive strength of the sample was measured: when the dosage was 10%, the 7-day strength was 2.6MPa, and the 28-day strength was 3.9MPa;

[0023] When the dosage is 15%, the 7-day strength is 3.1MPa, and the 28-day strength is 5.0MPa.

Embodiment 2

[0025] Preparation of curing agent: PO42.5 ordinary portland cement 8.3g: slag (ground to a specific surface area of ​​400m 2 / kg) 59g: nickel slag (grinded to a specific surface area of ​​300m 2 / kg) 15g: water glass (modulus: 2.6) 11.7g: the proportion of gypsum 6g Mix the raw materials evenly to prepare the soil curing agent;

[0026] According to the above test procedure and strength determination method, the solidified soil sample was prepared and the unconfined compressive strength of the sample was measured: when the dosage was 10%, the 7-day strength was 3.2MPa, and the 28-day strength was 4.8MPa;

[0027] When the dosage is 15, the 7-day strength is 3.8MPa, and the 28-day strength is 6.4MPa

Embodiment 3

[0029] Preparation of curing agent: PII52.5 Portland cement 12.1g, slag (ground to a specific surface area of ​​300m 2 / kg) 51.4g, nickel slag (ground to a specific surface area of ​​400m 2 / kg) 17g, water glass (modulus: 2.5) 13.5g, CaO6g, mix the raw materials evenly to prepare the soil curing agent;

[0030] According to the above test procedure and strength determination method, the solidified soil sample was prepared and the unconfined compressive strength of the sample was measured: when the dosage was 10%, the 7-day strength was 4.0MPa, and the 28-day strength was 6.1MPa;

[0031] When the dosage is 15%, the 7-day strength is 5.6MPa, and the 28-day strength is 8MPa

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Abstract

The invention relates to a composite soil solidifying agent, and a preparation method thereof. According to the invention, ore slag, nickel slag, cement, and chemical additives are mixed according to a certain ratio, such that the soil solidifying agent is obtained. When the solidifying agent with a proper amount is doped in weak soil, a substantial enhancing effect can be obtained. Especially, soil water resistance and corrosion resistance can be improved. The solidifying effect is substantially better than that of Portland cement. Industrial waste slag is adopted as main raw materials, such that cost is reduced, and environment protection is benefited.

Description

technical field [0001] The invention relates to a composite soil curing agent used for roadbed or foundation soil reinforcement treatment and its preparation and application, in particular to a curing agent for saline-alkaline soil treatment in coastal areas and its preparation and application. The invention belongs to the field of civil engineering materials. Background technique [0002] In civil construction projects such as house construction and road construction, we often encounter some weak soil whose endurance cannot meet the engineering technical requirements. These weak soils must be strengthened before they can be used as roadbeds or foundations, and roads or houses can be built on this basis. Adding a solidifying agent is one of the simple and efficient methods in many soil reinforcement treatment methods. The curing agent has the advantages of fast curing speed, high relative strength and small shrinkage. [0003] Our country has been using cement, lime or li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/19C04B7/36
CPCY02P40/10
Inventor 潘志华徐学分
Owner NANJING UNIV OF TECH
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