Effect of fly ash/silica fume ratio and curing condition on mechanical properties of fiber-reinforced geopolymer

Sukontasukkul, Piti; Chindaprasirt, Prinya; Pongsopha, Phattharachai; Phoo-ngernkham, Tanakorn; Tangchirapat, Weerachart; Banthia, Nemkumar

doi:10.1080/21650373.2019.1709999

Cited by 48 publications

(20 citation statements)

References 34 publications

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“…The improvement in the strength development of FA-GGBFS based GPC could be due to the injection of high reactive silica with small particle sizes that acted as fillers and enriched the cohesiveness between precursor materials and aggregates [14]. These properties of SF facilitated a higher degree of geopolymerization to form sodium or calcium-based silicates [40] as found from XRD analysis (Sect. 3.5.1) which led to an increase in the compressive strength.…”

Section: Effect Of Silica Fume (Sf)mentioning

confidence: 88%

Improvement in Fresh, Mechanical and Microstructural Properties of Fly Ash- Blast Furnace Slag Based Geopolymer Concrete By Addition of Nano and Micro Silica

Mustakim

Das

Mishra

et al. 2020

Silicon

111

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In this study, the effect of nano-silica (NS) and silica fume (SF) on workability, setting time, compressive strength and microstructural properties of fly ash-ground granulated blast furnace slag (FA-GGBFS) based geopolymer concrete (GPC) is investigated. Five mixtures of each containing 0.5%, 1.0%, 1.5%, 2.0% and 2.5% NS and SF are prepared for this investigation. The optimum GPC mixture with NS resulted in compressive strength of 63 MPa and the SF modified GPC achieved a compressive strength of 59.59 MPa after 28 days of outdoor temperature curing (Avg. temp. 31.4 ). The hardened concrete samples are analyzed through X-ray diffraction (XRD), X-ray fluorescence (XRF), field emission scanning electron microscope (FESEM), Fourier transform infrared spectroscopy (FTIR), and petrographic examination, for the better understanding of geopolymer mineralogy, mechanism and microstructure. Results indicate that both NS and SF facilitated a higher degree of geopolymerization, leading to the densification of the geopolymer matrix which led to the improvement of the properties of FA-GGBFS based GPC.

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Section: Effect Of Silica Fume (Sf)mentioning

confidence: 88%

Improvement in Fresh, Mechanical and Microstructural Properties of Fly Ash- Blast Furnace Slag Based Geopolymer Concrete By Addition of Nano and Micro Silica

Mustakim

Das

Mishra

et al. 2020

Silicon

111

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“…Therefore, the new eco-friendly cement is extensively studied in order to reduce the CO2 footprint. One of them is the alkali-activated binders that could produce from precursors consisting of Si 4+ and Al 3+ ions activated with a high alkali solution [7,8]. Many researchers [9][10][11][12] reported that the alkali-activated binders provided excellent mechanical and durability properties.…”

Section: Introductionmentioning

confidence: 99%

Drying shrinkage, strength and microstructure of alkali-activated high-calcium fly ash using FGD-gypsum and dolomite as expansive additive

Hanjitsuwan

Injorhor

Phoo-ngernkham

et al. 2020

Cement and Concrete Composites

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This paper aims to investigate drying shrinkage, strength development, and microstructure of alkali-activated high-calcium fly ash (AAFA) paste by using FGD-gypsum 2 (FGD) and dolomite (DLM) as the expansive additive. The 10 molar of sodium hydroxide combined with sodium silicate solutions were used as liquid alkaline activation in all mixtures. The preparation of the AAFA paste was divided into 2 steps. First, the study was focused on the effects of expansive additive (FGD and DLM) and liquid/binder (L/B) ratio on the drying shrinkage of the AAFA paste. The FA was replaced by FGD and DLM at the dosages of 0%, 2.5%, 5.0%, 7.5%, and 10% by weight of binder. The AAFA paste with low drying shrinkage at the age of 90 days would be selected to further study. The other was to study setting time, compressive strength, and microstructure of the AAFA paste containing FGD and DLM. Test results indicated that the use of FGD and DLM as the expansive additive could improve the drying shrinkage of the AAFA paste. The increasing L/B ratio had adverse effects on its drying shrinkage. The setting time of the AAFA paste containing FGD and DLM had decreased, whereas its strength development had increased. However, the strength development of the AAFA paste incorporated with FGD tended to decline at the curing time of 120 days. These behaviors were consistent with the results of XRD, FTIR, and SEM/EDS analyses. The differences in reaction products were an essential factor in the strength development of the AAFA paste with expansive additive. It can be recommended that using DLM was advantages regarding the improvement of drying shrinkage and longterm strength in comparison with the AAFA paste with FGD.

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“…En la investigación de Hariharan y colaboradores determinaron la prueba de asentamiento en los minerales de HS y CV en el concreto fresco alcanzando un máximo de 165 mm; con la adición de 6 y 10% de reemplazo del cemento; mientras aumenta el porcentaje de HS disminuye el asentamiento; una respuesta contraria es con la adición de CV de 30, 40 y 50% que al aumentar reduce la viscosidad plástica destacando una mejor trabajabilidad (Hariharan, et al , 2011); además se sabe que los aditivos que mejoran la viscosidad afectan la calidad del concreto en el proceso de desencofrado de desecho (Lin & Huang, 2015) y en el caso que se lleven a cabo un curado acelerado provoca una tasa de hidratación y resultan formaciones de microestructura prematuras (Sukontasukkul, et al, 2020) En la tabla 1 se describe un resumen de las propiedades del concreto en estado freso, afectado por el aditivo mineral; detallando los pesos unitarios de material cementoso, del aditivo, del agregado fino y grueso.…”

Section: Materiales Constituyentesunclassified

El Uso del aditivo mineral como modificador de las propiedades mecánicas en el concreto: una revisión

et al. 2021

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El presente artículo recopila e identifica la adición de ciertos aditivos minerales de uso más frecuente en la industria de la construcción como modificadores del concreto durante su estado fresco y endurecido, los cuales en su mayoría son usados como remplazo parcial del cemento. Actualmente los investigadores buscan optimizar las propiedades del diseño de mezclas dependiendo al uso por el cual son concebidas, así mismo que sea factible económicamente y respetuoso con el medio ambiente. Se revisaron 50 artículos indexados entre los años 2010 y 2021 distribuidos en las siguientes bases de datos: 37 artículos de Scopus, 10 artículos de ScienceDirect, 2 artículos de Springer y 1 artículo de SciELO. Los aditivos en estudio son escoria de alto horno granulada (EAHG), cenizas volantes (CV), humo de sílice (HS), ceniza de cascarilla de arroz (CCA). En su mayoría presentan una mejora considerable en sus características mecánicas de tracción, resistencia a la compresión y módulo de elasticidad. La adición de CV mejora en la mezcla del diseño durante su estado fresco, la CCA durante su estado endurecido y las mejores resistencias para el HS; sin embargo, la EAHG resulta cumplir con casi todas las expectativas en mayor porcentaje y así mismo junto con la CCA, son potencialmente competitivos.

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Effect of fly ash/silica fume ratio and curing condition on mechanical properties of fiber-reinforced geopolymer

Cited by 48 publications

References 34 publications

Improvement in Fresh, Mechanical and Microstructural Properties of Fly Ash- Blast Furnace Slag Based Geopolymer Concrete By Addition of Nano and Micro Silica

Improvement in Fresh, Mechanical and Microstructural Properties of Fly Ash- Blast Furnace Slag Based Geopolymer Concrete By Addition of Nano and Micro Silica

Drying shrinkage, strength and microstructure of alkali-activated high-calcium fly ash using FGD-gypsum and dolomite as expansive additive

El Uso del aditivo mineral como modificador de las propiedades mecánicas en el concreto: una revisión

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