Compressive strength and durability properties of high volume fly ash (HVFA) concretes containing ultrafine fly ash (UFFA)

Shaikh, Faiz Uddin Ahmed; Supit, Steve W.M.

doi:10.1016/j.conbuildmat.2015.02.068

Cited by 215 publications

(71 citation statements)

References 13 publications

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“…It is produced by a proprietary separation system with a mean particle diameter of 1-5 microns and contains 20% more amorphous silica than typical class F fly ash (particle diameter of 1-300 microns) [16]. Therefore, not only have the benefits of using UFFA in concrete been studied [17][18][19], but also the effectiveness of UFFA in improving the strength of fly ash concrete at early age has been evaluated [20]. The use of UFFA in concrete also contributes to the sustainability.…”

Section: Introductionmentioning

confidence: 99%

Behaviour of a Sustainable Concrete in Acidic Environment

Barbhuiya

Kumala

2017

Sustainability

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Sustainability has become one of the most important considerations in building design and construction in recent years. Concrete is susceptible to acid attack because of its alkaline nature. The socioeconomic losses associated with infrastructure deterioration due to acid attack exceed billions of dollars all around the world. An experimental investigation was carried out to study the behaviour of sustainable concrete in 3% sulphuric acid and 1.5% nitric acid environment in which cement was replaced by a combination of fly ash and ultra fine fly ash. It was found that the compressive strength loss of concrete in these acid environments was the minimum in which cement was replaced by 30% fly ash and 10% ultra fine fly ash. This mix also showed the lowest mass loss when exposed to these acids.

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Section: Introductionmentioning

confidence: 99%

Behaviour of a Sustainable Concrete in Acidic Environment

Barbhuiya

Kumala

2017

Sustainability

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“…Mining, processing, and metallurgical activities associated with the mixed sulfides industry generate large volumes of hazardous solid wastes and acidic leachates that may cause adverse impacts to the quality of soils, surface water, and groundwater; fly ash has a potential in permeable reactive barriers for the decontamination of groundwater (Komnitsas et al, 2006). The cement industry might use it as a raw material for the production of concrete (Shaikh and Supit, 2015;Bentz et al, 2015). Coal fly ash discharged from power plants can also be utilized as a by-product, and its use in recycling materials for agriculture and engineering is also being studied (Ram and Masto, 2014;Basu et al, 2009;Iyer and Scott, 2001;Kikuchi, 1999).…”

Section: Fly Ashmentioning

confidence: 99%

A review of metal recovery from spent petroleum catalysts and ash

et al. 2015

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“…Supit et al [27] noted that use of UFFA up to 15% in respect to binder mass determines a great improvement on compressive strength of HVFA mortars, especially at early ages, due to the larger specific surface area of ultrafine fly ash that promotes an increase in the amount of fly ashes involved in the pozzolanic reaction, an acceleration of this mechanism, and an improvement of both the transition zone and the microstructures of the matrix, especially in terms of porosity [28]. The same authors [29] investigated durability issues of concretes manufactured with UFFA characterized by mean size particles equal to 3.4 µm. Experimental results indicated that chloride diffusion coefficient decreases up to 70% respect to the reference mixture made with FA.…”

Section: Introductionmentioning

confidence: 98%

Plain and Ultrafine Fly Ashes Mortars for Environmentally Friendly Construction Materials

2018

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This paper is aimed to study the rheological and physical performance of mortars manufactured replacing Portland-based cements with low calcium siliceous fly ash (FA) or ultrafine fly ash (UFFA). Five different types of cement (CEM I, CEM II/A-LL, CEM III/A, CEM III/B, and CEM IV according to EN 197-1) were used. Mortars were manufactured with FA or UFFA replacing 5%, 15%, 25%, 35%, and 50% of cement mass. Results indicate that compressive strength of mortars with UFFA is considerably higher than that of mixtures containing traditional FA, both at early and long ages. Moreover, experimental data reveal that replacement of cement with up to 25% of UFFA determines higher compressive strength at 7, 28, and 84 days than plain mortars (containing cement only), regardless of the type of cement used. Mortars manufactured with 35% or 50% of UFFA show slightly lower or similar compressive strength compared to the reference mortar (containing cement only). In addition, the results show values of the strength activity index of mortars made with FA 25%, 23%, and 20% lower than the reference corresponding mortars (cement only) at 7, 28, and 84 days, respectively. The grinding of FA, despite resulting in an increase in production energy and CO 2 emissions compared to unmilled FA, allows a wide use of these SCM (Supplementary Cementitious Materials) in place of cement, reducing the environmental impact of mortars up to 40% at the 28-day strength class. The use of UFFA ensures better resistance in CaCl 2 -rich environments.

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Compressive strength and durability properties of high volume fly ash (HVFA) concretes containing ultrafine fly ash (UFFA)

Cited by 215 publications

References 13 publications

Behaviour of a Sustainable Concrete in Acidic Environment

Behaviour of a Sustainable Concrete in Acidic Environment

A review of metal recovery from spent petroleum catalysts and ash

Plain and Ultrafine Fly Ashes Mortars for Environmentally Friendly Construction Materials

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