Experimental research on the properties of foamed mixture lightweight soil with red mud

Ou, Xiaoduo; Zeng, Yuchu; Jiang, Jie; Lyu, Zhengfan; Chen, Hailiang; Huang, Peng

doi:10.1016/j.cscm.2022.e01673

Cited by 5 publications

(2 citation statements)

References 24 publications

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“…Moreover, fly ash also exists as a solid waste, and research on its application in road building is relatively mature [10][11][12]. Through alkali excitation, RM can be combined with other additives for the production of high-strength cementitious materials [13][14][15]. In recent years, there has been a gradual increase in research into RM as a road construction material.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Strength and Microstructure of Red Mud-Based Silty Sand Modified with Lime–Fly Ash

Yin,

Yan,

et al. 2024

Buildings

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This study aimed to assess the viability of utilizing lime–fly ash (LF) and red mud (RM) in the modification of silty soil (LF-RMS) for subgrade filling. The primary objective of this research was to analyze the mechanical characteristics and examine the curing mechanisms associated with said modified materials. Different curing times were utilized in the analysis of mechanical properties (e.g., via unconfined compression testing), microstructure (via scanning electron microscopy, X-ray diffraction, and thermogravimetric-differential thermal analysis), and environmental indices (via assessment of corrosivity, heavy metal concentration, and radioactivity) with various dosages of red mud (DRM) and Lime–fly ash (DLF). Analyses of the curing mechanisms, failure modes, microstructures, and degrees of environmental impact associated with LF-RMS were also undertaken. The tests indicated that the unconfined compressive strength (UCS) exhibited an initial increase followed by a decrease as the DRM and DLF levels increased. Additionally, the strength of LF-RMS increased with an increase in curing time. It is worth noting that the specimen composed of 20% LF and 23% RM (D20%LF+23%RM) demonstrated a maximum UCS value of 4.72 MPa after 90 days of curing, which indicates that it has the strongest ability to resist deformation. The strength of the specimen cured for 90 days was 1.4 times higher than that of the specimen cured for 7 days (1.97 MPa). Furthermore, the toxic concentration and radionuclide index of LF-RMS were significantly reduced compared to those of pure RM. The overall concentration of heavy metals in the D20%LF+23%RM specimen decreased by more than 60% after curing for 28 days. The internal irradiation index and the external irradiation index decreased by 1.63 and 1.69, respectively. The hydration products in LF-RMS play a key role in the solidification of heavy metals, and the alkaline environment provided by RM also contributes to the precipitation and replacement of heavy metals. In this study, red mud, fly ash and lime were used to modify silty soil. The central tenets of sustainable development may be achieved through the reuse of RM as a road filler.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on the Strength and Microstructure of Red Mud-Based Silty Sand Modified with Lime–Fly Ash

Yin,

Yan,

et al. 2024

Buildings

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“…Due to the late start of research on FLS in China, large-scale promotion and application are yet to be popularised, while FLS is generally not used for structural support and does not need to be studied for properties such as dry density, water absorption or thermal conductivity like foam concrete [ 27 , 28 , 29 ]. Many projects, depending on the geological soil conditions of the construction site and the surrounding service environment, require real-time targeted measures for the FLS in service [ 30 , 31 ]. The FLS used in the projects on which this research is based amount to more than 680,000 and are mostly built on soft ground such as fishing ponds and river embankments, although there are more than 60,000 infill piles in the lower part.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Properties of Low-Carbon Foamed Lightweight Soil with High Resistance to Sulphate Erosion Environments

Wang¹,

Wan

Líu³

et al. 2023

Materials

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Foamed lightweight soil (FLS) is a lightweight cementitious material containing a large number of tiny closed pores and has been widely used as a filler in places such as railways, roads and airports. However, there has been little research into the resistance of FLS to sulphate attack in practical engineering applications. The performance of FLS against different sulphate erosion concentrations was studied to elucidate the engineering characteristics of using large volumes of FLS as fill material for the road base in the construction of intelligent networked vehicle test sites. The results showed that the compressive strength of FLS prepared using 30% Portland cement (C), 30% granulated blast furnace slag (GBFS), 40% fly ash (FA) and a small amount of a concrete antiseptic agent (CA) as cementitious materials reached 0.8 and 1.9 MPa at 7 and 28 d, respectively, when the wet density was about 600 kg/m3, which met the design requirements. The FLS prepared via the above-mentioned cementitious system had a low carbon emission, with a CO2 emission reduction rate of up to 70%. It also had excellent sulphate attack resistance: the corrosion resistance coefficient of the cementitious material system reached 0.97, which was considerably better than that of C (0.83). For an erosion medium environment with SO42− concentrations of less than 1000 mg/L (moderate), 40% GBFS or FA can be used to prepare FLS. When the concentration of SO42− is less than 4000 mg/L (severe), 30% C, 30% GBFS and 40% FA can be used as cementitious materials, preferably in combination with an appropriate amount of CA, to prepare FLS.

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Collaborative effects of red mud and phosphogypsum on geotechnical behavior of cement-stabilized dredged clay

Ding,

Wan,

Jiao

et al. 2024

Bull Eng Geol Environ

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Experimental research on the properties of foamed mixture lightweight soil with red mud

Cited by 5 publications

References 24 publications

Experimental Study on the Strength and Microstructure of Red Mud-Based Silty Sand Modified with Lime–Fly Ash

Experimental Study on the Strength and Microstructure of Red Mud-Based Silty Sand Modified with Lime–Fly Ash

Preparation and Properties of Low-Carbon Foamed Lightweight Soil with High Resistance to Sulphate Erosion Environments

Collaborative effects of red mud and phosphogypsum on geotechnical behavior of cement-stabilized dredged clay

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