Composite cementing material with double efficacies for curing and improving salted silt soil

A composite cementitious material and dual-effect technology, applied in the field of composite cementitious materials, can solve problems such as it is difficult to meet the needs of engineering construction and development, and achieve sustainable development, low soluble salt content, strength and stability. high effect

Inactive Publication Date: 2019-03-01
NANJING UNIV OF TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, people have gradually realized the defects and deficiencies of these materials, and it is difficult to meet the needs of current engineering construction development.

Method used

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  • Composite cementing material with double efficacies for curing and improving salted silt soil
  • Composite cementing material with double efficacies for curing and improving salted silt soil
  • Composite cementing material with double efficacies for curing and improving salted silt soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044]In this embodiment, the compounding ratio of the saline silt composite solidification improvement material is: 6% of phosphogypsum, 7.5% of metallurgical waste residue, 1.5% of activator A, 0.6% of modifier, after the curing agent is mixed evenly, the salted The silt and curing agent are placed in a stirring pot and mixed evenly, and stirred for 5 minutes. For discharging, the mixed cured material is pressed into shape by a testing machine, and a cylindrical sample with a size of Φ50*50mm is prepared. Standard maintenance and engineering performance test results are shown in Table 1. The dried raw soil was crushed, and the sample particles were passed through a 3mm sieve. Then weigh 100g of the sample, place it in a 2L Erlenmeyer flask, add 500mL of deionized water, adjust the oscillation frequency to 110±10 times / min, and the amplitude to 40mm, shake at room temperature for 8h, and put the upper layer after standing for 16h. The supernatant was filtered through a 0.45 ...

Embodiment 2

[0052] In this embodiment, the compounding ratio of the saline silt soil composite curing improvement material is: 6% of phosphogypsum, 7.5% of metallurgical waste residue, 1.5% of activator A, 0.9% of modifier, after the curing agent is mixed evenly, the salted The silt and curing agent are placed in a stirring pot and mixed evenly, and stirred for 5 minutes. For discharging, the mixed cured material is pressed into shape by a testing machine, and a cylindrical sample with a size of Φ50*50mm is prepared. Standard maintenance and engineering performance test results are shown in Table 1. After the specimen is cured to a certain age, the cured body is broken, and the sample particles pass through a 3mm sieve. Then weigh 100g of the sample, place it in a 2L Erlenmeyer flask, add 500mL of deionized water, adjust the oscillation frequency to 110±10 times / min, and the amplitude to 40mm, shake at room temperature for 8h, and put the upper layer after standing for 16h. The supernata...

Embodiment 3

[0059] In this embodiment, the compounding ratio of the saline silt soil composite curing improvement material is: 10% of phosphogypsum, 12.5% ​​of metallurgical waste residue, 2.5% of activator A, 0.8% of modifier, and after the curing agent is mixed evenly, the saline The silt and curing agent are placed in a stirring pot and mixed evenly, and stirred for 5 minutes. For discharging, the mixed cured material is pressed into shape by a testing machine, and a cylindrical sample with a size of Φ50*50mm is prepared. Standard maintenance and engineering performance test results are shown in Table 1. After the specimen is cured to a certain age, the cured body is broken, and the sample particles pass through a 3mm sieve. Then weigh 100g of the sample, place it in a 2L Erlenmeyer flask, add 500mL of deionized water, adjust the oscillation frequency to 110±10 times / min, and the amplitude to 40mm, shake at room temperature for 8h, and put the upper layer after standing for 16h. The s...

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Abstract

The invention discloses a composite cementing material with double efficacies for curing and improving salted silt soil. The composite cementing material not only sufficiently utilizes industrial waste, solves the emission and stacking problems of the industrial waste, but also cures and improves the salted silt. The silt curing cost is reduced, the performance is improved, and the application range is enlarged. The composite cementing material is prepared from the following components in percentage by weight: 6 to 10 percent of phosphogypsum, 7.5 to 12.5 percent of high-magnesium metallurgicwaste residues, 1.5 to 2.5 percent of exciting agent A, 0.4 to 0.7 percent of exciting agent B, and 0.6 to 0.8 or 0.9 to 1.2 percent of improver; the use amount of each component is the weight percentage of each component to the salted silt; and the exciting agent A is prepared from NaOH and water glass, the weight percentage of NaOH is 20 to 40 percent, and the weight percentage of water glass is60 to 80 percent; and the exciting agent B is Na2SO4.

Description

technical field [0001] The invention specifically relates to a composite cementitious material, more specifically to a composite cementitious material with dual functions of curing and improving saline silt soil. Background technique [0002] With the further development of coastal areas, many key projects and infrastructure projects with huge investment and related to the national economy and people's livelihood are gathered in the coastal areas, and many of these projects are inevitably built on weak saline silt foundations. The disadvantages of saline silt soil are high salt content and water content, prone to mud turning, salt swelling, dissolution and secondary salinization and other diseases, and difficult plant growth; if it is not consolidated and improved, it is difficult to be directly used as Engineering soil or greening soil is used. [0003] The consolidation methods of saline silt soil mainly include mechanical method, vegetation method and chemical method, am...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/26C04B28/14
CPCC04B11/26C04B28/143C04B2201/50C04B18/144C04B22/062C04B12/04C04B22/147C04B22/06C04B22/064C04B22/066C04B18/0436
Inventor 华苏东张立力赵卫星赵益河麻晓波谷重
Owner NANJING UNIV OF TECH
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