Effect of curing time on microstructure and mechanical strength development of alkali activated binders based on vitreous calcium aluminosilicate (VCAS)

Tashima, Mauro M.; Soriano, Lourdes; Borrachero, M.V.; Monzó, J.; Payá, J.

doi:10.1007/s12034-013-0466-z

Cited by 28 publications

(8 citation statements)

References 23 publications

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“…as well as on the alkalinity of activating solution and on the curing conditions [5][6][7][8]. As can be observed in the literature, most of papers are related to the use of blast furnace slag [9][10][11], fly ash [12][13] and metakaolin [14][15] as an aluminosilicate material in the production of alkali-activated materials.…”

Section: Introductionmentioning

confidence: 99%

Alkali activated materials based on fluid catalytic cracking catalyst residue (FCC): Influence of SiO2/Na2O and H2O/FCC ratio on mechanical strength and microstructure

Tashima

Akasaki

Melges

et al. 2013

Fuel

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Reuse of industrial and agricultural wastes as supplementary cementitious materials (SCM) in concrete and mortar productions contribute to sustainable development. In this context, Fluid catalytic cracking catalyst residue (spent FCC), a byproduct from the petroleum industry and petrol refineries, have been studied as SCM in blended Portland cement in the last years. Nevertheless, others environmental friendly alternative has been conducted in order to produce alternative binders with low CO 2 emissions. The use of aluminosilicate materials in the production of Alkali-Activated Materials (AAM) is an ongoing research topic which can present low CO 2 emissions associated. Hence, this paper studies some variables that can influence the production of AAM based on spent FCC. Specifically, the influence of SiO 2 /Na 2 O molar ratio and the H 2 O/spent FCC mass ratio on the mechanical strength and microstructure are assessed.Some instrumental techniques, such as SEM, XRD, pH and electrical conductivity measurements, and MIP are performed in order to assess the microstructure of formed alkali-activated binder. Alkali activated mortars with compressive strength up to 80 MPa can be formed after curing for three days at 65 ºC. The research demonstrates the potential of spent FCC to produce alkali-activated cements and the importance of SiO 2 /Na 2 O molar ratio and the H 2 O/spent FCC mass ratio in optimising properties and microstructure.

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Section: Introductionmentioning

confidence: 99%

Alkali activated materials based on fluid catalytic cracking catalyst residue (FCC): Influence of SiO2/Na2O and H2O/FCC ratio on mechanical strength and microstructure

Tashima

Akasaki

Melges

et al. 2013

Fuel

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“…However, the higher concentration of NaOH produced an excess of Na + species that altered the balance requirement within the structure by satisfying the sodium content attraction, resulting in a decrease in compressive strength. On the other hand, the quantity of OH-groups that inhibit geopolymerization were attracted to initiate the dissolution of aluminosilicate minerals, resulting in broken Si-O-Si, Al-O-Al, and Si-O-Al and the formation of Al-OH and Si-OH groups [33]. These phenomena resulted in the formation of CSH gel binder and increased porosity, which influenced compressive strength values.…”

Section: Effect Of Naoh (Factor C)mentioning

confidence: 99%

Synthesis of Volcanic Ash-based Geopolymer Mortar Designed by the Taguchi Method

Karolina

Tarigan²,

Johari³

et al. 2022

Civ Eng J

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This study focuses on the geopolymer synthesized from Mount Sinabung’s volcanic ash. The compressive strength of the geopolymer was determined by optimizing five factors using the Taguchi method’s L16 array. The five factors included: volcanic ash wt.%, Sodium silicate (Na2SiO3) wt.%, Sodium hydroxide (NaOH) concentration (mole), Na2SiO3/NaOH wt.% and water/binder (w/b) wt.%. A total of 16 mixtures were prepared per the L16 array and evaluated on five levels to obtain the optimum mixture. The main findings of this study revealed that A2B1C2D3E4 produced the highest compressive strength of 79.625 MPa after three days of curing time, while A4B2C3D1E4 produced the lowest compressive strength of 41.93 MPa. The signal-to-noise (S/N) ratio analysis from the Taguchi method shows that the factor of Na2SiO3 has a greater impact on compressive strength. The X-ray diffraction (XRD) result for the geopolymer mortar revealed the formation of aluminosilicate type (N-A-S-H) and calcium silicate (C-S-H) gels, whereas the Scanning Electron Microscopy (SEM) result exhibited numerous pores and a denser structure. These characterization results demonstrated that the polymerization of volcanic ash mortar from Sinabung successfully conserves natural resources. Doi: 10.28991/CEJ-2022-08-11-016 Full Text: PDF

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“…On this subject, the authors have so far published three papers related to a new field for the application of VCAS, obtaining very interesting results [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Assessment of pozzolanic/hydraulic reactivity of vitreous calcium aluminosilicate (VCAS)

et al. 2016

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The aim of this paper is to assess the possibility of using vitreous calcium aluminosilicate (VCAS) as a supplementary cementitious material in the production of Portland cement mortars. The calcium hydroxide consumption by VCAS is assessed by two different methods: firstly, a classical method based on thermogravimetric analysis (TGA) and, secondly, pH and electrical conductivity measurements of calcium hydroxide/VCAS suspensions with excess calcium hydroxide. Evidence of pozzolanic reactivity of VCAS is revealed in hydrated lime pastes, and low reactivity was observed in aqueous suspensions.The reactivity of VCAS is also assessed by means of TGA of VCAS/OPC pastes and by means of the mechanical strength development of Portland cement mortars, with VCAS replacement percentages in the range of 10-30%. The results obtained show that pozzolanic and hydraulic reactions take place in OPC systems. VCAS can be used as a supplementary cementitious material by replacing OPC at levels of 10-30% by mass.

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Effect of curing time on microstructure and mechanical strength development of alkali activated binders based on vitreous calcium aluminosilicate (VCAS)

Cited by 28 publications

References 23 publications

Alkali activated materials based on fluid catalytic cracking catalyst residue (FCC): Influence of SiO2/Na2O and H2O/FCC ratio on mechanical strength and microstructure

Alkali activated materials based on fluid catalytic cracking catalyst residue (FCC): Influence of SiO2/Na2O and H2O/FCC ratio on mechanical strength and microstructure

Synthesis of Volcanic Ash-based Geopolymer Mortar Designed by the Taguchi Method

Assessment of pozzolanic/hydraulic reactivity of vitreous calcium aluminosilicate (VCAS)

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