Expansive soil improved by waste straw ash and marble ash and preparation method and application thereof in construction

A marble ash and waste straw technology, applied in the application, chemical instruments and methods, fertilization devices and other directions, can solve the problems of low content of modifiers, low strength, large amount of alkali slag, etc., and achieves improved shear strength and durability. The effect of solving damage problems and increasing frictional resistance

Inactive Publication Date: 2015-04-08
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN101423353B, the method and construction method for improving expansive soil with waste foundry sand, this patent fully considers the expansion characteristics, the improvement of strength and the recycling of resources, but there are still the following deficiencies: ①The improvement of strength is small; ②After no improvement Strength and durability research; ③ The specific construction method is not fully given
Chinese patent CN102352622A, method and construction method for improving expansive soil with alkali slag, this patent has made great achievements in improving expansive soil, but there are still the following deficiencies: ①The way to obtain solid waste is narrow; ②The amount of alkali slag is relatively large; ③ Modified strength durability studies were not performed
Chinese patent CN102249581A, method and construction method for improving expansive soil with calcium carbide slag, this patent considers reducing expansive soil properties of expansive soil and environmental protection, but there are still the following deficiencies: ① The durability characteristics of the improved filler are not given; ② No The strength characteristics after improvement are given; ③The content of the improver is low, which will bring certain difficulties to the specific construction

Method used

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  • Expansive soil improved by waste straw ash and marble ash and preparation method and application thereof in construction
  • Expansive soil improved by waste straw ash and marble ash and preparation method and application thereof in construction

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Experimental program
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Effect test

Embodiment 1

[0027] The preparation method of expansive soil improved with waste straw ash and marble ash comprises the following steps:

[0028] The first step is to prepare 1000g of mixed soil, according to the mass percentage of straw ash: marble ash: expansive soil (the dried soil sample is passed through a 0.5mm sieve) = 10:15:75, and the dry soil to be improved is weighed Quality 750g, straw ash 100g, marble ash 150g, mix uniformly; The analysis result of described straw ash is, in terms of the mass percentage of the oxide obtained after analysis and detection: silicon dioxide 61%, calcium oxide 25%, oxide Aluminum 5%, iron oxide 3%, potassium oxide 3%, magnesium oxide 2%, sodium oxide 1%; the analysis result of the marble ash is, based on the mass percentage of the oxide obtained after analysis and detection: calcium oxide 54.7% , carbon dioxide 40.9%, silicon dioxide 1%, aluminum oxide 1.3%, iron oxide 1.2%, magnesium oxide 0.9%.

[0029]In the second step, the optimal water conte...

Embodiment 2

[0034] The preparation method of expansive soil improved with waste straw ash and marble ash comprises the following steps:

[0035] The first step is to prepare 1000g of mixed soil, according to the mass percentage of straw ash: marble ash: expansive soil (the dried soil sample is passed through a 0.5mm sieve) = 10:20:70, and the dry soil to be improved is weighed Quality 700g, straw ash 100g, marble ash 200g, mix uniformly; The analysis result of described straw ash is, in terms of the mass percentage of the oxide obtained after analysis and detection: silicon dioxide 60%, calcium oxide 24.5%, oxide Aluminum 4.9%, iron oxide 2%, potassium oxide 4.8%, magnesium oxide 2.9%, sodium oxide 0.9%; the analysis result of the marble ash is, based on the mass percentage of the oxide obtained after analysis and detection: calcium oxide 55.2% , carbon dioxide 41.2%, silicon dioxide 1.2%, aluminum oxide 0.1%, iron oxide 0.8%, magnesium oxide 1.5%.

[0036] In the second step, the optima...

Embodiment 3

[0041] The preparation method of expansive soil improved with waste straw ash and marble ash comprises the following steps:

[0042] The first step is to prepare 1000g of mixed soil, according to the mass percentage of straw ash: marble ash: expansive soil (the dried soil sample is passed through a 0.5mm sieve) = 10:10:80, and the dry soil to be improved is weighed Quality 800g, straw ash 100g, marble ash 100g, mix uniformly; The analysis result of described straw ash is, in terms of the mass percentage of the oxide obtained after analysis and detection: silicon dioxide 60.7%, calcium oxide 23%, oxide Aluminum 4%, iron oxide 3.3%, potassium oxide 5%, magnesium oxide 3%, sodium oxide 1%; the analysis result of described marble ash is, in terms of the mass percent of the oxide obtained after analysis and detection: calcium oxide 54.1% , carbon dioxide 40.6%, silicon dioxide 1.7%, aluminum oxide 1.2%, iron oxide 1.2%, magnesium oxide 1.2%.

[0043] The second step is to determin...

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Abstract

The invention discloses expansive soil improved by waste straw ash and marble ash and a preparation method and an application thereof in construction and belongs to the technical field of geological disaster treatment and geotechnical engineering. The preparation method includes the following steps: 1 weighing straw ash, marble ash and dry soil of a soil body needing improving according by mass percent and evenly mixing; 2 determining the optimum moisture content of mixed soil; 3 adding water into the mixed soil obtained in step 1, evenly stirring the mixture and covering the soil in a wet mode to obtain the improved soil. The application of the improved soil in the construction includes laying the obtained improved soil on a construction face to form a surface improved layer, statically pressing the surface improved layer through a light packer, covering a plastic film to conduct enclosed maintenance, conducting vibrating grinding, conducting plastic film covering maintenance, conducting static pressing through a heavy packer and conducting fine flattening to achieve the strength required by a project. By means of the expansive soil, the preparation method and the application, the damage problem caused by expansion and contraction of the expansive soil and the environment pollution problem caused by wastes can be effectively solved.

Description

technical field [0001] The invention belongs to the technical field of geological disaster treatment and geotechnical engineering. In particular, it relates to expansive soil improved with waste straw ash and marble ash, its preparation method and its application in construction. technical background [0002] Expansive soil is highly sensitive to water, and has the characteristics of swelling when it encounters water, losing water and shrinking. Light structures on expansive soil foundations such as roads, railways, and water conservancy projects have great potential safety hazards, so expansive soil must be treated before construction. [0003] Expansive soils are widely distributed in our country. my country is one of the countries with the widest distribution and largest area of ​​expansive soils in the world. The areas endangered by expansive soils have reached more than 20 provinces, municipalities and autonomous regions. The engineering problems caused by expansive s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D3/12C09K17/06
Inventor 张德恒孙树林王成程亚男
Owner HOHAI UNIV
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