Influence of Some Additives on the Properties of OPC Solidified Sandy Silt

Wu, Dazhi; Chen, Keyu; Zhang, Zilong; Chang, Lifu

doi:10.3390/app11167252

Cited by 4 publications

(2 citation statements)

References 25 publications

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“…It was found that when the slag accounts for less than 60% of the solidification agent, the unconfined compressive strength of the solidified soil increases with the increase in the slag proportion. Wu et al [10] studied the use effect of cement composite additives on stabilizing silt, analyzed the effects of additive types and amounts on the mechanical properties and microstructure of stabilized soil, and found that the optimal mixing ratios of fly ash, clay, and gypsum were 4%, 4%, and 2%. Dhar et al [11] conducted clay solidification improvement experiments using plastic fibers and lime and conducted mechanical tests on solidified soil with different lime and fiber contents.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Synergistic Solidification of Soft Soil with Ceramic Powder–Slag–Phosphorus Slag

Shang,

Cui,

Zhang

2023

Sustainability

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The bearing capacity of silt soft soil is poor, making it difficult for it to be used as a subgrade material in foundation engineering, and the use of traditional Portland cement curing agents causes environmental pollution. In this study, a new soft soil curing agent, CSP (ceramic powder–slag–phosphorus slag), was prepared using ceramic powder, slag, and phosphorus slag. The unconfined compressive strength of 7-day was determined via an orthogonal test, and the optimal ratio of the curing agent was determined. The effects of the initial water content, curing agent content, admixture type, and admixture content on the mechanical properties of solidified soil were investigated via a uniaxial compression test. The microstructure characteristics of the solidified soil were analyzed via XRD and SEM-EDS, and the mechanism by which ceramic powder–slag–phosphorus slag acted as a curing agent to increase the strength of the soft soil was explored. The results show that the optimal ratio of the curing agent for the inorganic binder is ceramic powder/slag/phosphorus slag = 3:2:1, the best water glass modulus is 1 mold, the best water glass content is 26%, and the 7-day compressive strength can reach 2.382 MPa; the strength of the solidified soil decreases with an increase in the water content and increases with an increase in the curing agent content. When the water content is 35% and the curing agent content is 14%, the strength of the solidified soil can meet the requirements of relevant specifications. When the content of triisopropanolamine was 2.0% and 1.5%, the compressive strength of the 7-day and 28-day solidified soil specimens increased most significantly. The ceramic powder–slag–phosphorus slag can promote the formation of aggregates and amorphous hydration products (C-S-H, C-A-H), be distributed on the surface of the soil and fill the pores, and enhance the cementation between the particles, improving the compactness of the soil structure. In terms of the macroscopic performance, the mechanical properties of the solidified soil were significantly improved. Therefore, CSP curing agents can be promoted and applied as green, economical, environmentally friendly, and low-carbon curing materials in soft soil roadbed engineering.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on the Synergistic Solidification of Soft Soil with Ceramic Powder–Slag–Phosphorus Slag

Shang,

Cui,

Zhang

2023

Sustainability

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“…Many scholars have conducted extensive research on this topic. Wu et al [11] used cement composite admixtures to study the solidification of silt, studied the influence of different admixtures on the stability of soil mechanics characteristics and microstructure, and finally determined that the optimal mixing ratio of fly ash, clay, and gypsum is 4%, 4%, and 2%. Adhikari et al [12] used fly-ash-based geopolymers to improve medium-and high-plastic soils.…”

Section: Introductionmentioning

confidence: 99%

Strength and Microscopic Mechanism of Cement–Fly Ash–Slag–Desulfurization Gypsum Solidified Mica Schist Weathered Soil

Shang,

Cui,

et al. 2023

Materials

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Mica schist weathered soil possesses a number of poor engineering characteristics, which make it difficult to use as a subgrade material for resource utilization. Therefore, in this study, a new type of curing agent, CFSD (cement–fly ash–slag–desulfurized gypsum), is proposed for this soil. The effects of different curing agent dosages, age of preservation, and confining pressure on the stress–strain curves were analyzed via the uniaxial compression test and triaxial compression test, while the micromorphological characteristics of cured soil were analyzed via X-ray diffraction analysis and the SEM test combined with Image J software. In this paper, we also establish a microscopic mechanism model to determine how curing agents increase the strength of mica schists. The results reveal that the compressive strength of solidified soil increases rapidly within 28 days; the CFSD dosage of 4% at 7 d increased by 103.23% by 28 d. After 28 d, the trend of compressive strength growth was flat. The CFSD dosage of 4% at 7 d increased by 128.34% by 90 d; with the increase in the dosage, the curve transformed from flat to steep. These results suggest that the CFSD dosage is positively correlated with the damage strain and damage bias stress of solidified soil. The curves for the strain softening type with a 4% dosage as the initial effective confining pressure increased from 50 kPa to 300 kPa; the failure stress and failure strain increased by 202.09% and 90.85%, respectively. With the increase in curing agent dosage and maintenance age, the pore size of 2~5 μm, >5 μm interval decreased from 56.46% to 27.92%, the porosity decreased from 12.51% to 4.6%, and the hydrate produced by the curing agent cemented and filled up the pore space between the loose particles of the soil body. Thus, the large pore space became microporous, and the pore structure densification was greatly improved.

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The influence of fly ash-based geopolymer on the mechanical properties of OPC-solidified soil

Chen,

Wu,

Chen

et al. 2024

Construction and Building Materials

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Influence of Some Additives on the Properties of OPC Solidified Sandy Silt

Cited by 4 publications

References 25 publications

Experimental Study on the Synergistic Solidification of Soft Soil with Ceramic Powder–Slag–Phosphorus Slag

Experimental Study on the Synergistic Solidification of Soft Soil with Ceramic Powder–Slag–Phosphorus Slag

Strength and Microscopic Mechanism of Cement–Fly Ash–Slag–Desulfurization Gypsum Solidified Mica Schist Weathered Soil

The influence of fly ash-based geopolymer on the mechanical properties of OPC-solidified soil

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