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

Cao, Jing; Liu, Fangyi; Huang, Siyang; Liu, Hong; Song, Zhen; Li, Jianyun; Liu, Guoshou

doi:10.3390/su15043241

Cited by 2 publications

(2 citation statements)

References 36 publications

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“…The related scholarsʹ research results show that the cementʹs hydration product is mainly C-S-H. The diffraction angles 2θ corresponding to the XRD pattern are generally 29.1°, 31.8°, 49.8°, and 54.9° [35][36][37][38]. (a-c) in Figure 7 indicate that the XRD patterns show the presence of C-S-H, C-A-S-H(ICDD-PDF:18-0276), and C-A-H(ICDD-PDF:12-0408).…”

Section: Analysis Of Xrd 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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Section: Analysis Of Xrd 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

Self Cite

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show abstract

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

Cited by 2 publications

References 36 publications

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

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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