Effects of red mud on properties of self-compacting mortar

Liu, Rixin; Poon, Chi Sun

doi:10.1016/j.jclepro.2016.07.052

Cited by 53 publications

(9 citation statements)

References 33 publications

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“…Bauxite waste (red mud -RM) was also considered by Hairi et al (2015), due to its highly alkaline nature. Since RM worldwide annual generation surpasses 150 Â 10 6 t (Evans, 2016), several attempts to define viable recycling solutions have been conducted to use of red mud in distinct applications including: cements (Singh et al, 1996), mortars (Liu and Poon, 2016), geopolymers for structural (Hairi et al, 2015) and insulating applications (Badanoiu et al, 2015), traditional ceramics (P erez-Villarejo et al, 2012) and in wastewater treatment systems for dyes removal (Hajjaji et al, 2016), metal absorption (Sahu et al, 2016) or catalyst agent (Busto et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Red mud-based geopolymers with tailored alkali diffusion properties and pH buffering ability

Ascensão

Seabra

Aguiar

et al. 2017

Journal of Cleaner Production

111

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This study develop novel porous red mud (RM) based geopolymers and evaluates their potential to ensure prolonged pH control. Several properties of the novel geopolymers were examined including buffering ability, alkalis leaching behaviour, mineralogical composition, microstructure and physical properties. Two experimental plans were defined to evaluate the influence of porosity and RM content on those properties. The pH values of the eluted water and geopolymers OH À ions leaching have been determined over time showing that total OH À ions and the leaching rate can be tailored by controlling the geopolymers porous structure and the availability of free alkaline species. The lower pH gradient over 28th d (1.64 pH units) was achieved by combining a 0.025 wt% pore forming agent (aluminium powder) with 45 wt% MK replacement by red mud. A high and prolonged buffer capacity was accomplished, proving that red mud-based geopolymers have potential to be applied as pH buffering material.

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Section: Introductionmentioning

confidence: 99%

Red mud-based geopolymers with tailored alkali diffusion properties and pH buffering ability

Ascensão

Seabra

Aguiar

et al. 2017

Journal of Cleaner Production

111

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“…Red mud (RM) is a residue from the aluminum production industry, derived from the bauxite refining process to produce alumina, through Bayer method. Normally, the red mud is destined for waste ponds, which implies the occupation of considerable natural areas and an increase in the risk of triggering serious environmental impacts [23][24][25][26]. Red mud showed potential to reduce drying shrinkage in concrete [23] and autogenous shrinkage in mortars [24] due to internal curing effect, promoted by the porosity and high surface area of its particles.…”

Section: Introductionmentioning

confidence: 99%

Influence of bottom ash and red mud additions on self-leveling underlayment properties

2022

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Self-levelling underlayments (SLUs) based on Portland cement (PC) are susceptible to cracking due to drying shrinkage. The present study evaluated the influence of binder contents on systems consisting of calcium aluminate cement (CAC), PC, and a source of calcium sulfate (C$), derived from the flue gas desulfurization process (FGD), on the mechanical (flexural and compressive) properties and drying shrinkage of SLUs. The main objective was to analyze the influence of replacing limestone filler (LF) by bottom ash (BA) and red mud (RM) wastes on the properties of SLUs based on the CAC/FGD/PC (56/24/20) binder system. For this purpose, mini-slump flow, setting times, water absorption, mechanical (flexural and compressive) strength, linear shrinkage, and X-ray diffraction essays were performed. The replacement at a level of 0.2 filler with wastes reduced linear shrinkage while replacing 0.3 filler level provided greater initial (1 day) compressive strength.

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“…Yao et al [ 29 ] found that the strength of RM–fly ash as a cementitious material met the requirement for heavy metal leaching. Liu et al [ 30 ] tested the impact of RM on the properties of self-compacting mortar, showing that the leakage of self-compacting mortar was down, and the compressive and flexural strength improved when RM was added. Furthermore, Tang et al [ 31 ] found that the interface transition zone (ITZ) of concrete improved when RM was added.…”

Section: Introductionmentioning

confidence: 99%

Study on Preparation and Interfacial Transition Zone Microstructure of Red Mud-Yellow Phosphorus Slag-Cement Concrete

2021

Materials

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Open stockpiling and the continual production of industrial solid wastes such as red mud (RM) and yellow phosphorus slag (YPS) have caused serious environmental pollution issues. Additionally, concrete prepared easily and with high strength is a widely applied building material. Therefore, replacing part or all of the cement for preparing concrete with RM and YPS will greatly reduce this kind of solid waste and, thus, decrease environmental pressures. This study investigated the best ratio for the replacement of concrete with RM and YPS, testing the mechanical properties as well as the morphology, material composition, and microporous structure of the interface transition zone (ITZ). The results showed for the concrete prepared with ordinary Portland cement replaced by 10.00 wt.% RM and 18 wt.% YPS, compared to ordinary Portland cement concrete, the compressive strength of concrete with basalt aggregate and dolomite aggregate increased by 25.04% and 27.27%, respectively, when the concrete was cured with steam for 28 days. Furthermore, it had a smaller average pore diameter and crystal size in the ITZ. The aggregate and matrix were more closely intertwined. This was because RM had a low cementitious activity and mainly had a filling effect when added to concrete, while the highly active silica in YPS could react with the Ca(OH)2 crystal (CH) produced from cement hydration to form calcium silicate hydrate (CSH) gel, improving the mechanical properties and microstructure of the concrete.

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Effects of red mud on properties of self-compacting mortar

Cited by 53 publications

References 33 publications

Red mud-based geopolymers with tailored alkali diffusion properties and pH buffering ability

Red mud-based geopolymers with tailored alkali diffusion properties and pH buffering ability

Influence of bottom ash and red mud additions on self-leveling underlayment properties

Study on Preparation and Interfacial Transition Zone Microstructure of Red Mud-Yellow Phosphorus Slag-Cement Concrete

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