The effect of fly ash additive on the resistance of concrete to alkali silica reaction

Nagrockienė, Džigita; Rutkauskas, Aurimas

doi:10.1016/j.conbuildmat.2018.12.225

Cited by 34 publications

(14 citation statements)

References 16 publications

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“…It was observed that expansion increased with time for all tested mixtures (Figure 10). For instance, expansion was 0.37% for control specimens at 150 d compared to 0.28% at 28 d, as observed in previous studies [19,67,104,105]. Additionally, the rate of increase in expansion with time was less for specimens incorporating CBA (Figure 10).…”

Section: Effect Of Cba On Compressive and Flexural Strengthsupporting

confidence: 80%

“…predicted that ASR conducive exposure can reduce f'c by 20% after one-year expansion of 0.28% [105]. Similarly, reduction in flexural strength was observed for specimens exposed to ASR conducive environment compared to that of specimens placed in normal water (Figure 11b).…”

Section: Effect Of Asr On Compressive and Flexural Strengthsmentioning

confidence: 70%

“…For instance, specimens made with 20% CBA subjected to ASR conditions had 10% decrease in f'c at 150 days compared to identical specimens cured in water. Saha and Sarker [19] reported 12% reduction in f'c for specimens incorporating 20% fly ash subjected to NaOH solution at 80 • C. It was predicted that ASR conducive exposure can reduce f'c by 20% after one-year expansion of 0.28% [105]. Similarly, reduction in flexural strength was observed for specimens exposed to ASR conducive environment compared to that of specimens placed in normal water (Figure 11b).…”

Section: Effect Of Asr On Compressive and Flexural Strengthsmentioning

confidence: 89%

See 2 more Smart Citations

Recycling Untreated Coal Bottom Ash with Added Value for Mitigating Alkali–Silica Reaction in Concrete: A Sustainable Approach

et al. 2020

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Each year, about 730 million tons of bottom ash is generated in coal fired power plants worldwide. This by-product can be used as partial replacement for Portland cement, favoring resource conservation and sustainability. Substantial research has explored treated and processed coal bottom ash (CBA) for possible use in the construction industry. The present research explores using local untreated and raw CBA in mitigating the alkali–silica reaction (ASR) of reactive aggregates in concrete. Mortar bar specimens incorporating various proportions of untreated CBA were tested in accordance with ASTM C1260 up to 150 days. Strength activity index (SAI) and thermal analysis were used to assess the pozzolanic activity of CBA. Specimens incorporating 20% CBA achieved SAI greater than 75%, indicating pozzolanic activity. Mixtures incorporating CBA had decreased ASR expansion. Incorporating 20% CBA in mixtures yielded 28-day ASR expansion of less than the ASTM C1260 limit value of 0.20%. Scanning electron microscopy depicted ASR induced microcracks in control specimens, while specimens incorporating CBA exhibited no microcracking. Moreover, low calcium-to-silica ratio and reduced alkali content were observed in specimens incorporating CBA owing to alkali dilution and absorption, consequently decreasing ASR expansion. The toxicity characteristics of CBA indicated the presence of heavy metals below the US-EPA limits. Therefore, using local untreated CBA in concrete as partial replacement for Portland cement can be a non-hazardous alternative for reducing the environmental overburden of cement production and CBA disposal, with the added benefit of mitigating ASR expansion and its associated costly damage, leading to sustainable infrastructure.

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Section: Effect Of Cba On Compressive and Flexural Strengthsupporting

confidence: 80%

Section: Effect Of Asr On Compressive and Flexural Strengthsmentioning

confidence: 70%

Section: Effect Of Asr On Compressive and Flexural Strengthsmentioning

confidence: 89%

See 1 more Smart Citation

Recycling Untreated Coal Bottom Ash with Added Value for Mitigating Alkali–Silica Reaction in Concrete: A Sustainable Approach

et al. 2020

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“…Previous research by Nagrockienė and Rutkauskas [8] shows that using 65% fly ash as cement replacement increase the durability properties. Madani et al [9] found that utilizing at least 3% silica fume is recommended to provide excellent performance in enhancing durability and mechanical characteristics.…”

Section: Introductionmentioning

confidence: 92%

Investigation of Water Absorption for Concrete Using Supplementary Materials

Ghewa¹,

Suprobo²,

Irawan³

et al. 2020

JTS

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Concrete's durability is the key factor that affects the service life of the concrete structure. One factor that affects the durability properties of concrete is its pore structure, which can be investigated by analyzing the materials' absorption rate. For the structures with direct contact with water, water absorption can change the pore structure's behavior, affecting the durability of the conc in the long term rate. It is important to research to find the water absorption properties of concrete with different mixtures.This research investigates the rate of absorption of concrete by using fly ash and silica fume. Based on secondary absorption properties, the result shows that 15% fly ash in normal concrete increases the resistance to water penetration by 23%. The usage of 5% Silica Fume increases the resistance by 11.8%. The usage of 5% silica fume + 10% fly ash increases the resistance by 16.2%. It shows that the use of supplementary materials in concrete increases the resistance of water penetration. In this research, the usage of 15% fly ash as cement replacement shows the best result.

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“…From literature and experience, it was seen that the older samples subjected to the Oberholster test showed a higher expansion rate [45][46][47]. Several authors have speculated that the samples at an earlier age possess an open pore structure, which provides space for the swelling of the alkalisilica gel; thus, showing no/undetectable expansion in the dial gauges [48][49][50]. However, gel in the dense microstructure at a later age creates high swelling pressures, leading to higher expansion.…”

Section: Resistance To the Alkali-silica Reaction (Asr)mentioning

confidence: 99%

Feasibility Study on the Use of Modified Copper Slag as a Sustainable Fine Aggregate in Mortar

Sivakumar¹,

ruyaert²,

Belie³

et al. 2021

RPM

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Depending on the availability of aggregate sources pertaining to their geographic locations, the concrete industry utilizes conventional aggregates such as marine sand, dredged gravel, or crushed rocks. This method requires high energy and high processing costs for washing and grinding. The objective of this work is to use Modified Ferro silicate slag (MFS), a by-product obtained from the copper industry, as an alternative to the conventional fine aggregates found in mortar. No additional processing such as washing or grinding is required. By using the MFS slag as an aggregate in mortar or concrete, the factors of sustainability and a circular economy are enhanced. The current study focuses on the characterization of the MFS slag, including the mortar mixes with the MFS slag as a fine aggregate, and shows that the MFS slag can be a promising raw material to replace conventional aggregates in mortar. The leaching of its heavy elements such as Sb, As, Cr, Mo, Pb, and Zn was conducted well within limits (VLAREMA 4). The SEM and MIP analyses indicated that the porosity of the MFS slag mortar was higher compared to the standard aggregate mortar. Moreover, the MFS slag mortar showed acceptable resistance toward the alkali-silica reaction and carbonation.

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The effect of fly ash additive on the resistance of concrete to alkali silica reaction

Cited by 34 publications

References 16 publications

Recycling Untreated Coal Bottom Ash with Added Value for Mitigating Alkali–Silica Reaction in Concrete: A Sustainable Approach

Recycling Untreated Coal Bottom Ash with Added Value for Mitigating Alkali–Silica Reaction in Concrete: A Sustainable Approach

Investigation of Water Absorption for Concrete Using Supplementary Materials

Feasibility Study on the Use of Modified Copper Slag as a Sustainable Fine Aggregate in Mortar

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