Strength properties of Bayer red mud stabilized by lime-fly ash using orthogonal experiments

Liu, Shutang; Li, Zhuozhi; Li, Yingyong; Cao, Weidong

doi:10.1016/j.conbuildmat.2018.01.186

Cited by 56 publications

(17 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…FAFGs3 is still a turning point where the compressive strength arrives at the bottom and the porosity reaches the peak, and the porosity stops to rise and begins to decrease while the compressive strength shows the converse change. ere are many studies on the relationship between porosity and strength, and almost all of their conclusions point out that large porosity means bad strength performance [21,32]. Two main factors could be used to explain the connection between strength and pore structure; one is the free volume of pores (porosity) and the other is the single pore size (heterogeneously distributed large pores).…”

Section: Resultsmentioning

confidence: 99%

“…As for the preparation of FAFG, the most signi cant point is to stabilize the suitable pore structure and generate appropriate strength, which are a ected by di erent factors such as temperature, components, active materials, and so on [18][19][20][21]. However, there are few studies on FLA particle size e ect on the properties of FAFG and the root cause for the e ect has not been made clear yet.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fly Ash Particle Size Effect on Pore Structure and Strength of Fly Ash Foamed Geopolymer

Xiong

Wan

Zhou

et al. 2019

Advances in Polymer Technology

View full text Add to dashboard Cite

e aim of this paper is to study the particle size e ect of y ash (FLA) on pore structure and strength of Fly Ash Foamed Geopolymer (FAFG). Information on the macro-pores such as macro-pore size and distribution of FAFG is captured through binarization processing. Porosity and compressive strength of FAFG are respectively tested by Archimedes density test method and uniaxial compressive strength test method. It can be concluded that the FLA particle size has an e ect on the pore structure and strength of FAFG. More speci cally, the e ect of FLA particle size shows itself macroscopically on the quantity of middle and large macro-pores and the uniformity of macro-pores distribution, and microscopically on the quantity of micro-holes and cracks and calcium silicate (C-S-H) quantity at the early stage of FAFG mixture. All of the properties of FAFG follow some kind of changing rule except at the turning point when FLA particle is of 0.125~0.25 mm in size. To explain clearly the root cause of FLA particle size e ect on FAFG, SEM, and XRD are employed to explore the microstructure of FAFG and the component of FLA. It turns out to be the amorphous phase SiO 2 content in FLA of di erent particle sizes which could determine the reaction extent of FAFG mixture.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fly Ash Particle Size Effect on Pore Structure and Strength of Fly Ash Foamed Geopolymer

Xiong

Wan

Zhou

et al. 2019

Advances in Polymer Technology

View full text Add to dashboard Cite

show abstract

“…A high FA ratio could lead to increased pozzolanic reactions; as a result, a large amount of cementitious materials combined with the soil particles as time progressed [85,86]. With a high amount of stabilizer, a large amount of CaO could contact with silica and alumina from the soil and thus form the main short-term product, which was mainly influenced by dilution effects [87,88]. As time progressed, a large amount of CaO could react with a large amount of silica and alumina released from the stabilizer; accordingly, the formation of C-S-H accelerated, which played a major role in strength degradation as time progressed [80,83,87,88].…”

Section: Effect Of Variation In Fly Ash-stabilized Loess On Strainmentioning

confidence: 99%

“…With a high amount of stabilizer, a large amount of CaO could contact with silica and alumina from the soil and thus form the main short-term product, which was mainly influenced by dilution effects [87,88]. As time progressed, a large amount of CaO could react with a large amount of silica and alumina released from the stabilizer; accordingly, the formation of C-S-H accelerated, which played a major role in strength degradation as time progressed [80,83,87,88]. However, this result was completely opposite to that of Zia (2000), who suggested that the strength of specimens increased up to seven days of curing time and then UCS decreased for all the mixtures after 7-14 days [76].…”

Section: Effect Of Variation In Fly Ash-stabilized Loess On Strainmentioning

confidence: 99%

Influence of Submergence on Stabilization of Loess in Shaanxi Province by Adding Fly Ash

Phoak

Luo

et al. 2018

Applied Sciences

View full text Add to dashboard Cite

In this study, the influence of fly ash (FA) content (0%, 10%, 20%, and 30%) on the alteration in the physical and mechanical parameters of loess is investigated. The influences of curing time (0, 14, and 28 days) and submergence and non-submergence conditions are analyzed as well. Analysis considers the variation in Atterberg limits (liquid limit, plastic limit, and plasticity index), compaction parameters (optimum moisture content (OMC), and maximum dry density (MDD)), unconfined compressive strength (UCS) stress, UCS strain, California bearing ratio (CBR) value, and swell potential. Results show that the application of FA-stabilized loess (FASL) is effective. Specifically, the MDD decreases and the OMC increases, the UCS stress increases and the UCS strain decreases, the CBR value improves and the swell potential declines, but Atterberg limits are insignificantly changed by the increase in the FA ratio compared with those of untreated loess. The UCS stress and CBR value are improved with the increase in curing time, whereas the UCS strain is negligible. FASL under submergence condition plays an important role in improving the effect of FA on the UCS stress and CBR value compared with that under non-submergence condition. The UCS stress and CBR value are more increased and more decreased than the UCS strain in submerged samples. Therefore, the application of FASL in flood areas is important for obtaining sustainable construction materials and ensuring environmental protection.

show abstract

“…So, the utilization of red mud is imminent [6]. Red mud has been widely used in metal precipitation, building materials, and environmental remediation [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. In recent years, researchers have found that inorganic material modifier not only can improve the interface between asphalt and aggregate but also has the characteristics of simple production process, low price, excellent performance, and abundant reserves.…”

Section: Introductionmentioning

confidence: 99%

Multiscale Study on the Modification Mechanism of Red Mud Modified Asphalt

Wei

Bao

et al. 2020

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

Red mud, a waste residue of aluminium industry, was used as modified asphalt material to prepare red mud modified asphalt and red mud modified asphalt under freeze-thaw cycles. The matrix asphalt (MA), red mud modified asphalt (RMMA), and red mud modified asphalt under freeze-thaw cycles (RMMAFC) were studied by scanning electron microscopy (SEM), Fourier transform infrared spectrometry (FTIR), atomic force microscopy (AFM), and differential scanning calorimetry (DSC). Microscopic experiments were conducted to investigate the modification performance and mechanism. The modification mechanism of red mud modified asphalt was investigated using molecular dynamics simulation in this study. The results show that red mud can form a uniform and stable blending system with base asphalt after adding base asphalt. The structure of asphalt after adding red mud and adding red mud and freezing-thawing cycles does not change. The bee-structure decreases obviously with the addition of red mud by atomic force microscopy (AFM). Density decreases gradually, but bee-structure height increases obviously; bee-structure of red mud modified asphalt is destroyed after freeze-thaw cycles. Through differential scanning calorimetry (DSC), after adding red mud, heat absorption decreases. Freeze-thaw cycles greatly reduce heat absorption of red mud modified asphalt. Constructing molecular model of major components of red mud (Fe2O3, Al2O3) and asphaltene, simulation results show that the interfacial energy between asphaltene and red mud’s main components Fe2O3 and Al2O3 at −10°C, 25°C, and 170°C is stronger than that of Fe2O3. The results of calculating the interfacial energy of asphaltene on the chemical composition surface of red mud are negative. It can be seen that there are adsorption effects on the surface of asphaltene and red mud. Therefore, increasing the content of Al2O3 or decreasing the content of Fe2O3 in red mud is beneficial to the adsorption of asphaltene.

show abstract

Strength properties of Bayer red mud stabilized by lime-fly ash using orthogonal experiments

Cited by 56 publications

References 27 publications

Fly Ash Particle Size Effect on Pore Structure and Strength of Fly Ash Foamed Geopolymer

Fly Ash Particle Size Effect on Pore Structure and Strength of Fly Ash Foamed Geopolymer

Influence of Submergence on Stabilization of Loess in Shaanxi Province by Adding Fly Ash

Multiscale Study on the Modification Mechanism of Red Mud Modified Asphalt

Contact Info

Product

Resources

About