Influence of Humic Acid on the Strength of Cement‐Soil and Analysis of Its Microscopic Mechanism

Cao, Jing; Liu, Fangyi; Huang, Siyang; Kong, Cheng; Sun, Huafeng; Gao, Yue; Liu, Fuhua; Li, Jianyun; Liu, Guoshou

doi:10.1155/2022/1554204

Cited by 2 publications

(4 citation statements)

References 18 publications

(15 reference statements)

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“…The hydration product cements the soil particles and fills the pores between the particles. HA particles are partially dissolved in the alkaline environment formed by the hydration reaction, which affects the formation of hydration products [42]. The increase in the proportion of UFC makes the macropores filled with hydration products first, so the percentage of macropore volume in the total pores gradually decreases.…”

Section: Mip Results and Analysismentioning

confidence: 99%

“…HA particles and cohesive soil particles together constitute the skeleton of cemented soil. Since the particle size of HA is between 10 μm and 100 μm, which accounts for nearly 50%, it will be dissolved in a small amount in the alkaline environment generated by the hydration reaction so that the HA-containing cemented soil forms a macropore structure [42]. The interaction of HA with the hydration reaction leads to the reduction of hydration products.…”

Section: Mip Results and Analysismentioning

confidence: 99%

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Effect of UFC on the Microscopic Pore Structure of Cemented Soil in Humic Acid Environment

et al. 2023

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Peat soil is widely distributed in the Dianchi Lake area of Yunnan, and the effect of the cement deep-mixing method on peat soil foundation is mainly affected by humic acid (HA). In this paper, a composite cement curing agent is formed by adding different proportions of ultra-fine cement (UFC) to ordinary Portland cement (OPC) and used to cure the HA-containing cohesive soil. Mercury intrusion porosimetry (MIP), scanning electron microscopy (SEM), and X-ray powder diffraction (XRD) are used to study the influence mechanism of UFC on the micropore structure of HA-containing cemented soil. The unconfined compressive strength test (UCS) is used to verify it. MIP, SEM, and XRD results show that UFC can significantly improve the microscopic pore structure of the samples. The hydration reaction rate of cement increases with the increase in the proportion of UFC, and the generated hydration products can fill the pores of the samples. The filling effect of hydration products on macropores is enhanced, and the pores change from fibrous filling to cemented filling. The enhanced cementation of the hydration products improved the loose and overhead structure inside the sample. Enhancing the cementation of hydration products improves the loose and overhead structure inside the sample and the integrity of cemented soil. UCS verified that the increase in the UFC proportion increases the HA-containing cemented soil strength. It achieves the purpose of reducing the amount of cement when curing peat soil foundations and supports reducing carbon emissions in practical projects.

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Section: Mip Results and Analysismentioning

confidence: 99%

Section: Mip Results and Analysismentioning

confidence: 99%

Effect of UFC on the Microscopic Pore Structure of Cemented Soil in Humic Acid Environment

et al. 2023

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“…The dissolution of HA makes the structure of cemented soil loose [42]. HA also readily forms calcium humate with Ca 2+ [43][44][45][46]. The formation of HA reduces the formation of hydration products (combined with Formula ( 4)).…”

Section: Influence Of Soaking Time On Cemented Soilmentioning

confidence: 99%

“…The PCAS software divides the pores of the SEM image and obtains the characteristic pore data of the HA-containing cemented soil. In this paper, for the convenience of analysis, according to the pore characteristics of HA-containing cemented soil, this paper defines pores with a pore diameter greater than 10 µm as macropores [43,49]. The test results show that increasing the UFC proportion can improve the microstructure of cemented soil.…”

Section: Sem and Pcas Analysismentioning

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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Influence of Humic Acid on the Strength of Cement‐Soil and Analysis of Its Microscopic Mechanism

Cited by 2 publications

References 18 publications

Effect of UFC on the Microscopic Pore Structure of Cemented Soil in Humic Acid Environment

Effect of UFC on the Microscopic Pore Structure of Cemented Soil in Humic Acid Environment

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

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