Recent advances in alkaline cement binders: A review

Samarakoon, M.H.; Ranjith, P.G.; Rathnaweera, T.D.; Perera, M.S.A.

doi:10.1016/j.jclepro.2019.04.103

Cited by 77 publications

(25 citation statements)

References 65 publications

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“…Nowadays, geopolymers have emerged as one of the possible ecological binders with a reduced CO2 footprint [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Role of Heat-Treated Laterite on the Strengthening of Geopolymer Designed with Laterite as Solid Precursor

Poudeu¹,

Ekani²,

Djangang³

et al. 2019

ACSM

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This paper aims to develop a low-cost, green construction material for low-income house builders. A series of geopolymer samples were prepared by partially substituting the Cameroonian lateritic soil (LS) with different quantities of heat-treated laterite (20~50 wt. %). The chemical composition of the LS was determined through inductively coupled plasma spectroscopy (ICP). The specimens were subjected to thermogravimetric and differential thermal analyses (TGA/DTA), X-ray diffractometry (XRD) and Fourier Transform Infrared Spectroscopy (FTIR). In addition, the compressive strength of dry and wet specimens was measured with a hydroelectric device. The results show that the geo-polymerization and properties like setting time and mechanical strength of the samples were improved through the combined action of the raw LS and the laterite treated at 500-600°C; the crystallized particles from non-clayed minerals and from aggregates of kaolinite also contribute to strength of the samples; crystalline phases formed a tridimensional skeleton in the microstructure of the geopolymer. The research provides a promising composite that can serve as a low-cost construction material with reduced environmental impact.

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“…Nowadays, geopolymers have emerged as one of the possible ecological binders with a reduced CO2 footprint [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Role of Heat-Treated Laterite on the Strengthening of Geopolymer Designed with Laterite as Solid Precursor

Poudeu¹,

Ekani²,

Djangang³

et al. 2019

ACSM

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“…The morphological characterization for the formed geopolymer shows tetragonal structures. This mesh is responsible for the special physical-chemical properties of the geopolymer, such as its structural resistance, low specific gravity and low chemical reactivity in the environment due to the encapsulation of the contaminating elements in its tetragonal network as evidenced by [26].…”

Section: Discussionmentioning

confidence: 99%

Treatment of Mining and Thermoelectric Waste Through the Geopolymerization Process

et al. 2021

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Currently, energy and extraction activities generate large amounts of highly polluting waste, so there is a need for sustainable and environmentally friendly technologies. The aim of the study is to treat mining tailings and fly ash through the process of geopolymerization. The samples studied were obtained from the Toquepala mine, Tacna and from the ENGIE-Moquegua hydroelectric plant (Peru). The methodology was based on two stages, the first characterization of Fly Ash (FA) and mine tailings (MT) by EDX chemical characterization, SEM morphology, the second was prepared mixtures of MT and FA in 10 M alkaline solution, cured in 35 days at room temperature and the characterization of the geopolymer by organoleptic analysis, SEM and TCLP. The first stage shows high aluminosilicate content 20.44% Al2O3 and 53.39 % SiO2 for (MT); 22.11% Al2O3 and 51.76% SiO2 for (FA), presents metal and pyrite content. In the second stage, the samples show health and environmental harmlessness, with the formation of tetragonal structures typical of the geopolymer, the samples show a significant reduction of Sr, Ca, Fe, Pb, Ba, Be, and Cu, demonstrating the effectiveness of treatment by means of geopolymerization opening a new field for the environmental passive treatment.

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“…Due to the high mechanical strength, good durability, and fire resistance, these materials are competitive in many applications, such as repair mortars, adhesives, hightech ceramics, among others. [1][2][3][4][5] Geopolymers consist of tridimensional aluminosilicate structures, formed by the polycondensation of reactive silica and alumina in a highly alkaline media. The silica and alumina are provided by the solid phase, named precursor.…”

Section: Introductionmentioning

confidence: 99%

“…In the last decades, a new class of materials has been widely studied as an environmentally and economically viable alternative compared to the traditional Portland cement products: the geopolymers. Due to the high mechanical strength, good durability, and fire resistance, these materials are competitive in many applications, such as repair mortars, adhesives, high‐tech ceramics, among others 1‐5 …”

Section: Introductionmentioning

confidence: 99%

Assessment of mechanical and microstructural properties of geopolymers produced from metakaolin, silica fume, and red mud

Mendes

Andrade

Carvalho

et al. 2020

Int J Applied Ceramic Tech

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Geopolymers have been studied as viable alternative to traditional Portland cementbased products, given the use of industrial by-products as raw materials. This work evaluated the mechanical and microstructural properties of geopolymeric mortars produced with sodium hydroxide solution, metakaolin, silica fume, and red mud. The mixtures were produced by means of dosages with different molar ratios and curing conditions. The raw materials were characterized by granulometry, chemical, mineralogical, and thermal analysis. The characterization of mortars was performed by scanning electron microscopy (SEM) and axial compressive strength tests. The precalcination at 850°C of the red mud was sufficient to make it more reactive and suitable for use in geopolymers. Noteworthy, the best mechanical strengths of metakaolin mortars for curing at 50°C, and with the lowest SiO 2 /Al 2 O 3 ratios. In the mortars with incorporated red mud, there was a decrease of strength at thermal curing conditions and with the increase of residue content, whose microstructure indicates the formation of more pores in the geopolymer matrix. The thermal curing promoted the formation of sodalite crystals, and the significant presence of Na particles on the surface suggests that part of the added NaOH did not react with the precursors.

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Recent advances in alkaline cement binders: A review

Cited by 77 publications

References 65 publications

Role of Heat-Treated Laterite on the Strengthening of Geopolymer Designed with Laterite as Solid Precursor

Role of Heat-Treated Laterite on the Strengthening of Geopolymer Designed with Laterite as Solid Precursor

Treatment of Mining and Thermoelectric Waste Through the Geopolymerization Process

Assessment of mechanical and microstructural properties of geopolymers produced from metakaolin, silica fume, and red mud

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