Durability of fly ash based geopolymer concrete in the presence of silica fume

Okoye, F.N.; Prakash, Satya; Singh, N.B.

doi:10.1016/j.jclepro.2017.02.176

Cited by 237 publications

(77 citation statements)

References 11 publications

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“…Moreover, the high silica content in silica fume results in higher Si/Al ratio and hence a stronger geopolymeric matrix. The results which are obtained in this category are correspondent to the previous findings in this concern [12][13][14]. Table 6 Silica fume fine particles were responsible for a faster wave flow and hence better results.…”

Section: Strength Propertiessupporting

confidence: 88%

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Fly ash based geopolymer composites partially replaced with silica fume: An experimental investigation

Al-mashhadani¹,

Canpolat²,

Aygörmez³

et al. 2019

Sustainable Construction Materials and Technologies (SCMT)

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Nowadays, the environmental impact which is caused by the industrial development specially in construction section have led to an increasing interest in geopolymer field and thereby have promoted the research in terms of full replacement of Portland cement binder and feasible utilization of waste materials. In this paper, an attempt was done to fabricate a binding matrix that is totally cement free and based on eco-friendly materials. The effect of adding silica fume on strength properties, physical properties and resistance to abrasion were studied. In general, silica fume was found to enhance the investigated properties due to the fineness of silica fume particles which generally formed geopolymeric composites with more compact matrix. The geopolymeric matrix which is fabricated with the presence of silica fume has shown an obvious improvement in terms of physical properties. Moreover, the compactness of the matrix led to a good performance regarding the abrasion resistance, to be more specific, the abraded surface was more resistant to weight loss after adding silica fume. In addition to that, an acceptable degree of correlation was obtained when the results of the studied properties were linked, results from strength tests and the ones from non-destructive tests were having a good degree of correlation.

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Section: Strength Propertiessupporting

confidence: 88%

“…Okoye et al [14] studied the inclusion of silica fume in fly ash GPC and investigated the resistance of the final product against chloride and sulfuric attacks. Deterioration rates in strength and weight losses were tested for the fabricated concretes and compared to an ordinary OPC concrete mix.…”

Section: Introductionmentioning

confidence: 99%

Fly ash based geopolymer composites partially replaced with silica fume: An experimental investigation

Al-mashhadani¹,

Canpolat²,

Aygörmez³

et al. 2019

Sustainable Construction Materials and Technologies (SCMT)

View full text Add to dashboard Cite

show abstract

“…Nevertheless, a very rare study on fume silica in geopolymer is available in the existing literature. Limited works have focussed on studying the performance of silica fume blended fly ash based geopolymer concrete [13][14][15][16] . Chindaprasirt et al concluded that silica fume as supplements improves the performance of fly ash geopolymer in connection with strength and durability 13 .…”

Section: Introductionmentioning

confidence: 99%

“…Lee et al have shown that the reactivity of geopolymer concrete is enhanced when a combination of fly ash, slag, and silica fume is used as binder 14 . Okoye et al have recently reported that fume silica in fly ash geopolymer improves the physical performance 15 . Very recently, Duan et al investigated the performance of silica fume blended activated fly ash in micro and macro level after temperature fluctuating cycles with different heating temperatures of 200 o C; 400 o C and 800 o C, replacing fly ash by 0% to 30% silica fume with an interval of 10%, by weight 16 .They commented that blended geopolymer emphasizes rapid strength development in geopolymer.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Mechanical and Microstructural Properties of Silica Fume Blended Fly Ash Based Geopolymer Using Murram as a Tertiary Supplement

Dutta¹,

Ghosh²

2018

RJC

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The present study aims to investigate the compressive strength and the underlying micro-structural change of fly ash geopolymer paste with silica fume and murram as supplements up to 10% and 2.5% of the total weight respectively. The workability property of the geopolymer paste samples was evaluated at a green state using a unique methodology based on the polar graph. Besides, various geopolymer paste samples were subjected to heat curing at different temperatures and also for different durations to find the influence of heat curing to the obtained compressive strengths. The present study also probed into the underlying micro-structural changes of the corresponding geopolymer paste samples through SEM (Scanning Electron Microscopy), MIP (Mercury Intrusion Porosimetry) and EDX (Energy Dispersive X-Ray Analysis). Through the present analysis, it can be concluded that blending of silica fume and murram with fly ash based geopolymer paste results in a sustainable high performance binder even at lower alkalinity with lower heat consumption as well as lower water content which can be considered as a better alternative of cement concrete binder to march towards environmental sustainability.

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“…Concrete is a construction material that is widely used in all civil engineering applications. 1 The use of normal weight concrete significantly increases the demand of normal weight aggregate (NWAs) thus resulting in a significant decrease in natural stone deposits and damages to the natural ecosystem. 2,3 In addition, the use of NWAs is also not favorable for tall buildings, long span bridges or floating structures as they increase the structures self-weight.…”

mentioning

confidence: 99%

Effects of silica fume fineness on mechanical properties of steel fiber reinforced lightweight concretes subjected to ambient and elevated temperatures exposure

Arel

Shaikh

2018

Structural Concrete

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This paper presents the effects of silica fume (SF) fineness and fiber aspect ratios of steel fiber on fresh and harden characteristics of high‐strength lightweight concrete containing oil palm shell as coarse aggregates. The effect of elevated temperatures on the residual compressive strength of above concretes is also evaluated in this study. Three different SF fineness of 18 400, 21 000, and 28 000 m2/kg and 2 different aspect ratios of steel fiber of 40 and 80 are considered. Results show that the increase in SF fineness and steel fiber aspect ratio marginally affect the air‐dry density of steel fiber reinforced lightweight high‐strength concretes, however, the workability is reduced by about 9% to 14% due to increase in SF fineness. The compressive strength of steel fiber reinforced lightweight concretes at all age increases with increase in SF fineness and an improvement of about 37% is observed at 56 days by increasing the SF fineness from 18 400 to 28 000 m2/kg. Strong correlations are also observed between the strength improvement factor and the SF fineness. Water absorption of above concretes is also reduced by 3% to 14% due to increase of SF fineness from 18 400 to 21 000 and 28 000 m2/kg. The increase of SF fineness also significantly reduces the residual compressive strength loss at 300°C and 450°C. This loss of residual compressive strength is lower in lightweight concretes containing 16 mm long steel fiber than 8 mm long steel fiber. The existing Eurocode model overestimates the residual compressive strength of steel fiber reinforced lightweight concretes containing no SF, however, this discrepancy is significantly reduced with increase in SF fineness.

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Durability of fly ash based geopolymer concrete in the presence of silica fume

Cited by 237 publications

References 11 publications

Fly ash based geopolymer composites partially replaced with silica fume: An experimental investigation

Fly ash based geopolymer composites partially replaced with silica fume: An experimental investigation

Enhancing the Mechanical and Microstructural Properties of Silica Fume Blended Fly Ash Based Geopolymer Using Murram as a Tertiary Supplement

Effects of silica fume fineness on mechanical properties of steel fiber reinforced lightweight concretes subjected to ambient and elevated temperatures exposure

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