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Floury soil improving method

A technology of silt and micro-silica fume, which is applied in the field of expressway subgrade filling, can solve the problems of high cost of improvement, low mechanical properties, and restrictions on the wide application of low liquid limit silt, so as to ensure strength, reduce permeability and compression and brittleness, improving unconfined compressive strength and water stability

Inactive Publication Date: 2019-08-20
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Nowadays, through a variety of improvement schemes for low liquid limit silt, the performance of low liquid limit silt can basically be used as a common roadbed material for road construction. However, due to the limitations of the silt material itself or the improved formula, As a result, the performance of the existing low liquid limit silt improved roadbed materials is not ideal, and there are many defects such as low mechanical properties, poor water stability, and high improvement costs, making the existing low liquid limit silt improved roadbed materials unusable. The subgrade construction of high-standard roads seriously limits the wide application of low liquid limit silt in road construction, and also increases the construction cost of road construction on silt areas

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A method for improving silt, characterized in that: comprising the steps of:

[0019] S1, take each component by weight part:

[0020] 80 parts of low liquid limit silt; 2.4 parts of cement; 3.2 parts of lime; 2.4 parts of lignin; 0.3 parts of sodium diethylene triamine pentacarboxylate; 0.4 parts of polyol; Powder 1.28 parts;

[0021] S2. Place the weighed cement, lime, and fly ash in a high-speed mixing mixer, and after stirring for 0.5h, spray lignin, sodium diethylenetriaminepentacarboxylate, polyhydric alcohol, microsilica powder and Acrylic emulsion, the spraying time of each raw material is controlled at 20 minutes, after the addition is completed, the mixture is obtained;

[0022] S3. Mix the obtained mixture with the weighed low liquid limit silt, add water and stir for 30 minutes to obtain the roadbed filler, and the water content of the roadbed filler is 12% to 15%.

Embodiment 2

[0024] A method for improving silt, characterized in that: comprising the steps of:

[0025] S1, take each component by weight part:

[0026] 100 parts of low liquid limit silt; 5 parts of cement; 6 parts of lime; 5 parts of lignin; 0.5 parts of sodium diethylenetriamine pentacarboxylate; 1 part of polyol; 2.4 parts of powder;

[0027] S2. Put the weighed cement, lime, and fly ash in a high-speed mixing mixer, and after stirring for 1 hour, spray lignin, sodium diethylenetriaminepentacarboxylate, polyhydric alcohol, microsilica fume, and acrylic acid in sequence while stirring Emulsion, the spraying time of each raw material is controlled within 30 minutes, after the addition is completed, the mixture is obtained;

[0028] S3. Mix the obtained mixture with the weighed low liquid limit silt, add water and stir for 45 minutes to obtain the roadbed filler, and the water content of the roadbed filler is 12%-15%.

Embodiment 3

[0030] A method for improving silt, characterized in that: comprising the steps of:

[0031] S1, take each component by weight part:

[0032] 90 parts of low liquid limit silt; 3.7 parts of cement; 4.6 parts of lime; 3.7 parts of lignin; 0.4 parts of sodium diethylene triamine pentacarboxylate; 0.7 parts of polyol; 1.8 parts of powder;

[0033] S2. Place the weighed cement, lime, and fly ash in a high-speed mixing mixer, and after stirring for 0.75h, spray lignin, sodium diethylenetriaminepentacarboxylate, polyhydric alcohol, microsilica powder and Acrylic emulsion, the spraying time of each raw material is controlled at 25 minutes, after the addition is completed, the mixture is obtained;

[0034] S3. Mix the obtained mixture with the weighed low liquid limit silt, add water and stir for 37.5 minutes to obtain the roadbed filler, and the water content of the roadbed filler is 12% to 15%.

[0035] The roadbed filler prepared in Example 1-Example 2 was evaluated by the uncon...

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PUM

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Abstract

The invention discloses a floury soil improving method. The method comprises following steps: weighing following raw materials in parts by weight: 80 to 100 parts of low liquid limit floury soil, 2.4to 5 parts of cement, 3.2 to 6 parts of lime, 2.4 to 5 parts of lignin, 0.3 to 0.5 part of penta-sodium diethylene triamine penta-carboxylate, 0.4 to 1 part of polyol, 0.56 to 1.2 parts of acrylic emulsion, 1.6 to 3 parts of fly ash, and 1.28 to 2.4 parts of silica fume; adding the cement, lime, and fly ash into a high speed mixing-stirring machine, stirring for 0.5 to 1 hour, sequentially spraying lignin, penta-sodium diethylene triamine penta-carboxylate, polyol, silica fume, and acrylic emulsion under stirring, after addition, mixing the obtained mixture with weighed low liquid limit flourysoil, adding water, and blending to obtain a roadbed filling material. The unconfined compressive strength and water stability of mixed soil are improved; the permeability, compressibility, and brittleness of the mixed soil are reduced, and the strength of the mixed soil is guaranteed.

Description

technical field [0001] The invention relates to the field of highway subgrade fillers, in particular to a silt improvement method. Background technique [0002] Silt is widely distributed in alluvial plains, river deltas, and coastal plains in China. The silt has uniform particles, single particle size, poor viscosity, poor gradation, small liquid limit, low plasticity index, and low strength. The California bearing ratio CBR (California Bearing Ratio) is not easy to meet the engineering design requirements, and it is a road construction material with poor engineering properties. Low liquid limit silt refers to silt with a liquid limit of less than 50%. This kind of silt soil sample has poor gradation, and the soil has high compressibility and permeability. The porosity is as high as 9% to 10%, and it has not reached the real compactness, which provides a convenient channel for the infiltration of rainwater, thereby providing conditions for the deformation of the roadbed, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/10
CPCC04B28/10C04B2111/0075C04B2201/50C04B14/361C04B7/00C04B24/24C04B24/123C04B24/026C04B24/2641C04B18/08C04B18/146
Inventor 韦丽容洪流钟贤勍许杨少君韦宇秦梓航
Owner GUANGXI UNIV