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An improved low liquid limit silt roadbed material and its preparation method and application

A technology of low liquid limit and soil roadbed, applied in roads, roads, buildings, etc., can solve the problems of low mechanical properties, high improvement cost, poor water stability, etc., achieve good impermeability, reduce engineering costs, and cheap prices Effect

Active Publication Date: 2022-03-11
CHANGAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art, to provide an improved low liquid limit silt roadbed material and its preparation method and application, which are used to solve the poor performance of the existing low liquid limit silt after improvement. High cost, poor water stability during application, and low mechanical properties

Method used

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  • An improved low liquid limit silt roadbed material and its preparation method and application
  • An improved low liquid limit silt roadbed material and its preparation method and application
  • An improved low liquid limit silt roadbed material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The prepared alkali excitation material is blended into low liquid limit silt according to a blending ratio of 3%, and an appropriate amount of water is added to prepare the edge wrapping material with a moisture content of 10.5% to 12.5%.

[0048] The preparation process in the alkali-activated material is as follows: mix fly ash, steel slag and cement according to the mass ratio of 2:2:1, then mix with water of equal quality to make A liquid and stir evenly, and the concentration is 5mol / L NaOH is set as liquid B, and liquid A and liquid B are mixed at a volume ratio of 3:1 to make an alkali-activated material.

Embodiment 2

[0050] The prepared alkali excitation material is blended into low liquid limit silt according to a blending ratio of 5%, and an appropriate amount of water is added to prepare the edge wrapping material with a moisture content of 11.2% to 13.2%.

[0051] The preparation process in the alkali-activated material is as follows: mix fly ash, steel slag and cement according to the mass ratio of 2:2:1, then mix with water of equal quality to make A liquid and stir evenly, and the concentration is 5mol / L NaOH is set as liquid B, and liquid A and liquid B are mixed at a volume ratio of 3:1 to make an alkali-activated material.

Embodiment 3

[0053] The prepared alkali-activated material is blended into low-liquid-limit silt at a blending ratio of 8%, and an appropriate amount of water is added to make an edge-wrapping material with an optimum water content of 12.1%-14.1%.

[0054] The preparation process in the alkali-activated material is as follows: mix fly ash, steel slag and cement according to the mass ratio of 2:2:1, then mix with water of equal quality to make A liquid and stir evenly, and the concentration is 5mol / L NaOH is set as liquid B, and liquid A and liquid B are mixed at a volume ratio of 3:1 to make an alkali-activated material.

[0055] Put the subgrade edging materials prepared in Examples 1 to 3 into the curing room for standard curing (temperature 20±2°C, relative humidity ≥ 95%), and test their unconfined compressive strength and penetration at 7d and 28d coefficient.

[0056] The test results are shown in Table 1 below:

[0057] The performance parameter test of table 1 embodiment 1-3

[...

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Abstract

The invention discloses an improved low-liquid-limit silt roadbed material and its preparation method and application. The roadbed material increases alkali-activated materials in low-liquid-limit silt, and the alkali-activated materials include fly ash, steel slag, cement and NaOH Solution; the roadbed material adds alkali activator to the roadbed material. The alkali activator has the characteristics of low temperature resistance, strong freeze-thaw cycle resistance, good impermeability, etc., and can also ensure that the strength meets the requirements; the steel slag and pulverized coal used The ashes are industrial waste materials, which are cheap and can reduce engineering costs. The invention has low temperature resistance, good impermeability, and strong freeze-thaw cycle resistance.

Description

【Technical field】 [0001] The invention belongs to the technical field of low liquid limit silt improvement, and in particular relates to an improved low liquid limit silt roadbed material and its preparation method and application. 【Background technique】 [0002] As an important part of the road, the roadbed is the support of the road surface. It bears the load transmitted by the road surface and directly affects the performance of the road surface. To ensure the overall performance of the road, the roadbed must have sufficient strength, stability and durability. . With the improvement of road grades in our country, the load of traffic vehicles has increased rapidly, and the requirements for the performance of roadbed and pavement are also getting higher and higher, and the performance of roadbed is mainly determined by the properties of roadbed fillers. Silt, silt is widely distributed in alluvial plains, river deltas, and coastal plains in China. The silt has uniform part...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00E01C3/04
CPCC04B28/00E01C3/04C04B2111/0075C04B18/08C04B18/142C04B22/062C04B14/04
Inventor 包卫星陈锐苗金辉李迪李卓蹇永明黄翀垚郭兴会张利斌
Owner CHANGAN UNIV
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