Utilization of volcanic ashes for the production of geopolymers cured at ambient temperature

Tchakouté, Hervé K.; Elimbi, A.; Yanne, E.; Djangang, Chantale Njiomou

doi:10.1016/j.cemconcomp.2013.03.010

Cited by 154 publications

(73 citation statements)

References 20 publications

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“…The final setting time of the simple system (NP) is 851 minutes, which is reduced by 87% by adding 30% GBFS (Table 5). These results agree with the increase of the heat of reaction of the binary samples and with the results found by other researchers (9,11,13). This effect of adding GBFS to geopolymer systems has been attributed to the simultaneous formation of C-S-H and C-A-S-H gels that together with the N-A-S-H gel, form the C-(N)-A-S-H-gel (6,15,16).…”

Section: Geopolymerisation Kineticssupporting

confidence: 83%

“…Tchakoute et al (9) report compressive strength of up to 50 MPa after 28 days of curing at ambient temperature for a volcanic pozzolan from Cameroon. However, other researchers have noted the need for thermal curing treatments or the addition of secondary CaO and Al 2 O 3 sources such as granulated blast furnace slag (GBFS) and metakaolin (MK) to achieve good mechanical performance in a short amount of time due to the semi-crystalline nature and the deficiencies in the reactivity of CaO and Al 2 O 3 in these materials (10,(12)(13)(14).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Natural pozzolan-and granulated blast furnace slag-based binary geopolymers

Robayo¹,

Gutiérrez²,

Gordillo³

2016

Mater. construcc.

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This study describes the synthesis at ambient temperature (25±3 °C) of binary geopolymer systems based on natural volcanic pozzolan and granulated blast furnace slag. Na 2 SiO 3 and NaOH were used as alkaline activators. The effects of the SiO 2 /Al 2 O 3 , Na 2 O/Al 2 O 3 ratio and the amount of slag added (from 0 to 30%) on the reaction kinetics, compressive strength and microstructure of the final product were studied. To characterise the geopolymer pastes, techniques such as X-ray diffraction (XRD), infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) were used. The results indicate the possibility of obtaining a geopolymer cement with a compressive strength of up to 48.11 MPa after 28 days of curing at ambient temperature whose characteristics are comparable to those of commercial portland cement. RESUMEN: Geopolímeros de tipo binario basados en una puzolana natural y escoria siderúrgica de alto horno.Este trabajo describe la síntesis a temperatura ambiente (25±3 °C) de sistemas geopoliméricos de tipo binario basados en una puzolana natural de origen volcánico y escoria siderúrgica de alto horno usando activadores alcalinos basados en la combinación de Na 2 SiO 3 y NaOH. Se estudió el efecto de la relación SiO 2 /Al 2 O 3 , Na 2 O/ Al 2 O 3 y la cantidad de escoria adicionada en niveles entre el 0 y 30% sobre la cinética de reacción, la resistencia a la compresión y la microestructura del producto final. Para la caracterización de las pastas geopoliméricas se utilizaron técnicas como difracción de rayos X (DRX), espectroscopia infrarroja (FTIR) y microscopia electró-nica de barrido (MEB). Los resultados conseguidos revelan la posibilidad de obtener un cementante geopolimérico con una resistencia a la compresión de hasta 48,11 MPa a los 28 días de curado a temperatura ambiente cuyas características son comparables a las de un cemento portland comercial.

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Section: Geopolymerisation Kineticssupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Natural pozzolan-and granulated blast furnace slag-based binary geopolymers

Robayo¹,

Gutiérrez²,

Gordillo³

2016

Mater. construcc.

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“…Its chemical composition is shown in table 1. The volcanic scoria Z G was previously studied by Tchakouté et al [1,5,9,10] corresponds to the workability and used technology-pouring into the molds. The alkaline solution used for the conventional process was a mixture of an aqueous solution of sodium hydroxide (10 M) and the commercial sodium silicate solution with a mass ratio of sodium silicate solution/NaOH solution was 2.4 with (pH=14).…”

Section: Methodsmentioning

confidence: 99%

“…Previous researches [1,3,4,5] have shown that another process such as fusion method can be used to synthesize geopolymers. The alkali fusion is a conventional method for chemical analysis to decompose materials containing silicon and/or aluminum.…”

Section: Introductionmentioning

confidence: 99%

A comparative study of two methods to produce geopolymer composites from volcanic scoria and the role of structural water contained in the volcanic scoria on its reactivity

Tchakouté

Kong

Djobo

et al. 2015

Ceramics International

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“…These inorganic compounds do not use Portland cements as binder, but instead employ a material such as fly-ash, rich in silicon (Si) and aluminium (Al), which reacts to alkaline liquids to produce binder [1][2][3][4]. Geopolymers have attracted the interest of scientists due to their low cost, low curing and hardening temperatures, and excellent thermal stability at high temperatures [5][6][7][8][9]. However, despite these desirable attributes, they suffer from brittle failure like most ceramics.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of cotton fabric reinforced geopolymer composites at 200–1000 °C

et al. 2014

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Abstract:Geopolymer composites containing woven cotton fabric (0-8.3 wt%) were fabricated using the hand lay-up technique, and were exposed to elevated temperatures of 200 ℃, 400 ℃, 600 ℃, 800 ℃ and 1000 ℃. With an increase in temperature, the geopolymer composites exhibited a reduction in compressive strength, flexural strength and fracture toughness. When heated above 600 ℃, the composites exhibited a significant reduction in mechanical properties. They also exhibited brittle behavior due to severe degradation of cotton fibres and the creation of additional porosity in the composites. Microstructural images verified the existence of voids and small channels in the composites due to fibre degradation.

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Utilization of volcanic ashes for the production of geopolymers cured at ambient temperature

Cited by 154 publications

References 20 publications

Natural pozzolan-and granulated blast furnace slag-based binary geopolymers

Natural pozzolan-and granulated blast furnace slag-based binary geopolymers

A comparative study of two methods to produce geopolymer composites from volcanic scoria and the role of structural water contained in the volcanic scoria on its reactivity

Mechanical properties of cotton fabric reinforced geopolymer composites at 200–1000 °C

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