Composite curing agent suitable for peat soil and preparation method thereof

A compound type and curing agent technology, which is applied in the field of civil engineering and construction materials, can solve the problems that the strength of solidified soil cannot meet the design requirements, the effect of solidified peat soil is not good, and it is difficult to harden into piles, etc., so as to reduce engineering diseases and social economy. Benefit loss, increase strength, and optimize the effect of carrying capacity

Active Publication Date: 2019-04-16
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the hardening and cementing properties of lime, cement and other materials will be limited in peat soil. Traditional, single hydraulic cementitious materials are not effective in curing peat soil, and the strength of the solidified soil cannot meet the design requirements.
In engineering applications, traditional cement piles in peat soil strata will take too long to form piles, or even harden into piles.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: A compound curing agent suitable for peat soil, comprising the following materials in parts by mass: 100g of cement, 70g of red clay, 10g of alkaline phosphogypsum, 3g of sodium sulfate, 1.5g of sodium chloride, and 300g of water.

[0018] The cement is P.O 42.5 ordinary Portland cement, the red clay is dry high plastic clay particles with a particle size less than 2mm, and the phosphogypsum is dry dihydrate gypsum (CaSO 4 2H 2 O), sodium sulfate is dry analytically pure granules, sodium chloride is dry analytically pure granules.

[0019] A kind of preparation method of the composite curing agent applicable to peat soil, comprises the steps:

[0020] (1) Take the above-mentioned raw materials in parts by mass;

[0021] (2) Take the cement, red clay and alkaline phosphogypsum described in step (1), and mix them uniformly to obtain a solid phase mixture;

[0022] (3) Take the sodium sulfate and sodium chloride described in step (1), mix and dissolve them...

Embodiment 2

[0026] This example is basically the same as Example 1, except that the following materials are included in parts by mass: 200g of cement, 70g of red clay, 20g of alkaline phosphogypsum, 6g of sodium sulfate, 3g of sodium chloride, and 300g of water.

[0027] The above-mentioned composite curing agent was added to 800 g of peat soil with an organic matter content of 78.3%, a moisture content of 231.9%, and a void ratio of 3.88, and an indoor curing test was carried out. The unconfined compressive strength measured after 28 days of curing of the test block was 517kPa .

Embodiment 3

[0029] This example is basically the same as Example 1, except that the following materials are included in parts by mass: 300g of cement, 70g of red clay, 30g of alkaline phosphogypsum, 9g of sodium sulfate, 4.5g of sodium chloride, and 300g of water.

[0030] The above-mentioned composite curing agent was added to 800 g of peat soil with an organic matter content of 78.3%, a moisture content of 231.9%, and a void ratio of 3.88, and an indoor curing test was carried out. The unconfined compressive strength measured after 28 days of curing of the test block was 707kPa .

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Abstract

The invention discloses a composite curing agent suitable for peat soil and a preparation method thereof, and belongs to the field of civil building materials. The composite curing agent suitable forpeat soil is made from 100-300 parts of cement as a self-setting material, 70-150 parts of red clay as pore filling, particle dispersion and organic dilution components, 10-30 parts of phosphogypsum as an alkaline excitation component, 3-9 parts of sodium sulfate, 1.5-4.5 parts of sodium chloride as a hydration acceleration component, and 300-400 parts of water as a hydration inducing component. The curing agent can significantly improve the strength of peat and peaty soil, and the performance of the peat and peaty soil as a building foundation and a roadbed filler is optimized. The consumption of cement for curing peat soil is reduced, the red clay is easy to obtain from local sources, the utilization of waste soil in engineering is improved, and the use of phosphogypsum can reduce the environmental pollution caused by phosphogypsum stacking. The raw materials of the composite curing agent are easy to obtain, the preparation is simple, the cost is low, and the curing agent has certainenvironmental and economic benefits.

Description

technical field [0001] The invention relates to a hydraulic cementitious material for improving soil properties, in particular to a composite curing agent suitable for peat soil and a preparation method thereof, belonging to the field of civil engineering and building materials. Background technique [0002] According to relevant industry norms and standards in my country, soil with an organic matter content greater than 10% can be qualified as peat soil, including peaty soil (10%<organic matter content≤60%) and peat (organic matter content>60%). This type of soil is mainly distributed in my country's Changbai Mountains, Greater and Lesser Xing'an Mountains, the Sanjiang Plain, most mountainous areas in Xinjiang, the Ruoergai Plateau in western Sichuan, the Qinghai-Tibet Plateau, the Yunnan Plateau, and the middle and lower reaches of the Yangtze River. Due to the joint effect of topography, hydrological conditions, climate factors, vegetation coverage and microbial de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14
CPCC04B28/143C04B2111/00732C04B2201/50C04B7/02C04B14/10C04B22/147C04B22/124
Inventor 王志良王竟宇申林方丁祖德
Owner KUNMING UNIV OF SCI & TECH
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