Study on Simulation Test of Peat Soil Environment in Dianchi Lake

Cao, Jing; Huang, Siyang; Liu, Wenlian; Kong, Cheng; Gao, Yue; Liu, Fangyi

doi:10.1155/2022/1437733

Cited by 6 publications

(6 citation statements)

References 5 publications

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“…According to the previous research results, the total content of HG in the peat soil of Dianchi Lake is between 7.15% and 50.06%. Among them, the content of HA is between 2.36% and 28.13%, and the content of FA is between 0.79% and 8.34% [16]. Te results provide the basis for incorporating HA and FA reagents in the samples.…”

Section: Simulation Basis Of the Indoor Organic Soil Environmentmentioning

confidence: 85%

“…Te results show that organic matter signifcantly afects peat soil's soil-water characteristic curve, and peat soil's water-holding capacity increases with increased organic matter content. In 2022, Cao et al [15,16] were used to simulate the peat soil environment (PES) by mixing HA reagent into cohesive soil and soaking it in an FA solution. Te test result shows that the PES with diferent HA and FA contents can simulate by this method, but soaking samples in FA solution cannot reach the actual efect.…”

Section: Introductionmentioning

confidence: 99%

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Study on Strength Development Mechanism of Organic Soil in Dianchi Lake, China

Huang

Cao

Kong

et al. 2022

Advances in Materials Science and Engineering

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The organic soil is widely distributed around Dianchi Lake in Kunming, which is rich in the humic group (HG). In order to explore the effect of HG on the strength development of organic soil, this paper adopts the method of adding humic acid (HA) reagent into the undisturbed cohesive soil (blending method) and soaking it in fulvic acid (FA) solution (steeping method) to simulate the organic soil. Then, the effect of HG on soil is analyzed by the unconfined compressive strength (UCS) and the scanning electron microscope (SEM) tests. The UCS test shows that HA can significantly reduce the UCS of the samples, and it continues to decrease with the increase of the HA reagent content. FA can substantially enhance the UCS of the samples, which continues to increase with the concentration of FA solution (decreasing the pH value). Under each HG condition, the steeping of FA can significantly increase the UCS of the sample when the content of the HA reagent is less than 10%, and the growth rate of the UCS decreases when it is greater than 10%. With the increase of steeping age, the UCS of the 5% HA samples continued to increase and gradually became stable, and when the content of the HA reagent is more than 5%, the UCS curve first increases and then decreases. The SEM test shows that adding HA reagent can significantly increase the pore size, improve the connectivity between the pores, and weaken the connection of the soil structure. The steeping of FA can reduce the pore size, weaken the connectivity between the pores, and strengthen the connection of the sample structure.

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Section: Simulation Basis Of the Indoor Organic Soil Environmentmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Study on Strength Development Mechanism of Organic Soil in Dianchi Lake, China

Huang

Cao

Kong

et al. 2022

Advances in Materials Science and Engineering

Self Cite

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“…The diameter of ultra-fine particles is small. The Van der Waals force between the particles is much larger than their gravity-part of the fine particles agglomerate reduces the comparative area of the agglomerate [30]. The surface reaction activity is reduced, the degree of hydration is lowered, and the amount of hydration products is reduced accordingly.…”

Section: Analysis Of Ucs Test Resultsmentioning

confidence: 99%

Analysis of the Effect of Ultra-Fine Cement on the Microscopic Pore Structure of Cement Soil in a Peat Soil Environment

Cao,

Huang,

Sun

et al. 2023

Applied Sciences

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Treating peat soil foundations around Dianchi Lake and Erhai Lake in Yunnan is a complex problem in practical engineering projects. Peat soil solely reinforced with ordinary cement (OPC) does not satisfy demand. This study aims to solidify soil to achieve better mechanical properties. The preparation of peat soil incorporates a humic acid (HA) reagent into cohesive soil, and cement and ultra-fine cement (UFC) are mixed by stirring to prepare cement soil samples. They are then immersed in fulvic acid (FA) solution to simulate cement soil in the actual environment. X-ray diffraction (XRD), mercury intrusion porosimetry (MIP), scanning electron microscopy (SEM), and pores and cracks analysis system (PCAS) tests are used to study the impact of the UFC on the microscopic pore structure of cement soil in a peat soil environment. The unconfined compressive strength (UCS) test is used for verification. The microscopic test results indicate that incorporating UFC enhances the specimen’s micropore structure. The XRD test results show the presence of C–S–H, C–A–S–H, and C–A–H. SEM and PCAS tests show that the UFC proportion increases by between 0% and 10%, and the percentage reduction in the macropore volume is the largest, at 38.84%. When the UFC admixture is 30%, the cumulative reduction in the percentage of macropore volume reaches 71.55%. The MIP test results show that the cumulative volume greater than 10 µm in pore size decreases from 7.68% to 0.17% with an increase in the UFC proportion. The UCS test results show that the maximum strength growth of cement soil is 12.99% when the UFC admixture is 0–10%. Incorporating UFC to form a compound curing agent solves the problem of the traditional reinforcement treatment of peat soil foundation being undesirable and decreases the amount of cement. This study provides practical guidance for reducing carbon emissions in actual projects.

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“…Considering the practicability and economy of the actual engineering, different UFC proportions γ (0%, 10%, 20%, 30%, 40%, 50%) were set with a gradient of 10%. The HA content of peat soil in the Dianchi Lake area is about 2.36% to 28.13% [26]. The HA reagent content λ (0%, 15%, 30%) was set according to the actual HA content, and the HA reagent was mixed with cohesive soil to simulate different peat soil environments.…”

Section: Experimental Methodsmentioning

confidence: 99%

Effect of Ultra-Fine Cement on the Strength and Microstructure of Humic Acid Containing Cemented Soil

et al. 2023

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The peat soil in the Dianchi Lake area of Yunnan, China, is widely distributed, bringing many problems to engineering. The peat soil foundation is usually treated by the cement mixing method, and the reinforcement effect of cemented soil is mainly affected by humic acid (HA). Ultra-fine cement (UFC) can improve cement performance and reduce cement consumption, decreasing CO2 emissions and the impact of human activities on the environment. Simulated peat soils in different environments are prepared with HA reagent and cohesive soil, reinforced by composite cement curing agent mixed with ultrafine cement (UFC). The relationship among the UFC proportion, HA reagent content, soaking time, and sample strength was studied. The unconfined compressive strength test (UCS), scanning electron microscope (SEM), and PCAS microscopic quantitative test techniques were used to explore the mechanism of the effect of UFC on the strength of HA-containing cemented soil. The increasing UFC proportion in the composite cement curing agent gradually increased HA-containing cemented soil’s strength. UFC significantly reduced the percentage of macropores in HA-containing cemented soil and made the microstructure denser. The HA-containing cemented soil’s qu increased the most when the UFC proportion increased from 0% to 10%. The solidification effect of the composite cement curing agent mixed with UFC was always stronger than that of OPC. The composite cement curing agent with a UFC proportion of 10% is practical. Cement is still an important building material in the current construction industry, and UFC provides a new method for reducing environmental impact in engineering construction.

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Study on Simulation Test of Peat Soil Environment in Dianchi Lake

Cited by 6 publications

References 5 publications

Study on Strength Development Mechanism of Organic Soil in Dianchi Lake, China

Study on Strength Development Mechanism of Organic Soil in Dianchi Lake, China

Analysis of the Effect of Ultra-Fine Cement on the Microscopic Pore Structure of Cement Soil in a Peat Soil Environment

Effect of Ultra-Fine Cement on the Strength and Microstructure of Humic Acid Containing Cemented Soil

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