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Expansive soil modifier and method of use thereof

A technology of expansive soil and modifier, applied in the field of expansive soil modifier, to achieve the effects of no impact on human health and environment, increased CBR, and increased internal friction angle

Active Publication Date: 2019-11-12
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The curing mechanism of gemini surfactants in oil reservoir clay anti-swelling is similar to that of expansive soil modifiers, but the application of gemini surfactants in expansive soils has not been reported yet

Method used

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  • Expansive soil modifier and method of use thereof
  • Expansive soil modifier and method of use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] An expansive soil modifier, comprising the following components by weight percentage: N,N'-bis(octyldimethyl)-2-hydroxyl-1,3-dichloride propylene diammonium salt, namely (C 8 -3(OH)-C 8 2Cl － ) 1%, potassium chloride 10%, cationic polyacrylamide 0.5%, water glass content 5%, water glass modulus 3, and the balance is water.

[0033] The preparation method of the N,N'-bis(octyldimethyl)-2-hydroxyl-1,3-dipropylene diammonium chloride comprises the following steps:

[0034] (1) Synthesis of intermediate N-(3-chloro-2-hydroxypropyl)-N,N-dimethyloctyl ammonium chloride;

[0035] Add 4.25mL of hydrochloric acid and 10mL of water into a three-necked round-bottomed flask, heat and reflux at 40°C and stir, and add 10mL of N,N-dimethyloctylamine dropwise at a rate of 0.2-0.5mL per minute. Add 6.25mL epichlorohydrin dropwise at a speed of about 0.3mL, and measure the content of hydroxypropyl quaternary ammonium salt [12] to determine the endpoint. After the reaction was comple...

Embodiment 2

[0042] The difference with Example 1 is that the expansive soil modifier used comprises the following components by weight percentage: C 8 -3(OH)-C 8 2Cl － 0.5%, potassium chloride 5%, cationic polyacrylamide 0.1%, water glass content 3%, water glass modulus 2.74, and the balance is water.

Embodiment 3

[0044] The difference with Example 1 is that the expansive soil modifier used comprises the following components by weight percentage: C 8 -3(OH)-C 8 2Cl － 0.7%, potassium chloride 7%, cationic polyacrylamide 0.15%, water glass content 3%, water glass modulus 2, and the balance is water.

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Abstract

The invention discloses an expansive soil improver which comprises the following components in percentage by weight: 0.1-10% of propyl diammonium N,N'-bis(octyldimethyl)-2-hydroxy-1,3-dichloride, 1-10% of potassium chloride, 0.01-10% of cationic polyacrylamide, 1-10% of water glass and the balance of water. The expansive soil improver can well inhibit the expansion potential of the expansive soil. The improved soil sample has the advantages of lower specific area, lower total pore size and higher average pore size. The plastic limit is enhanced, the plasticity index, expansibility and 50KPa free expansion rate are lowered, and the expansion property of the soil sample is improved. The shrinkage limit is enhanced, the transversal reduction ratio, vertical reduction ratio and volumetric shrinkage are lowered, and the shrinkage potential of the soil sample is fixed. The shear strength is enhanced, the CBR is increased, the strength of the soil sample is enhanced, and various indexes can satisfy the engineering construction requirements. The electron microscope spectrum of the soil sample indicates that the soil sample has obvious grain agglomeration and obvious fixing effect. The improver has favorable permeability, is simple for construction, and does not influence the people and environment in the construction process and after improvement.

Description

technical field [0001] The invention relates to the field of an expansive soil modifier, in particular to an expansive soil modifier and a method for using the same. Background technique [0002] Expansive soil is a highly fissured clay that absorbs water and swells and softens, loses water and shrinks, cracks, and repeatedly expands and shrinks. The properties of expansive soil that are different from ordinary clay are mainly high expansion and contraction, multiple cracks, over-consolidation and strength attenuation. Expansive soils are widely distributed in my country, but they are mainly concentrated in the southeast area of ​​the Beijing-Xi'an-Chengdu line. Since the early 1950s, my country encountered the hazard of expansive soil in Chengdu for the first time during the construction of the Chengdu-Chongqing Railway Project, and was often affected by the hazard of expansive soil in engineering construction. Especially in the South-to-North Water Diversion Project, our...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40C09K103/00
CPCC09K17/40C09K2103/00
Inventor 熊德元丁世磊张信贵
Owner GUANGXI UNIV
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