Potential alkali silica reaction expansion mitigation of ferronickel slag aggregate by fly ash

Saha, Ashish Kumer; Sarker, Prabir Kumar

doi:10.1002/suco.201700273

Cited by 24 publications

(21 citation statements)

References 34 publications

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“…Therefore, application of 30% fly ash found to be a suitable ASR mitigation measure according to ASTM C1567. The application of 30% fly ash reduces the ASR in AMBT by alkali binding, portlandite consumption, pozzolanic reaction, and reducing the interconnected voids, which has been shown in another study …”

Section: Resultsmentioning

confidence: 57%

“…This nickel slag generates during the production of nickel alloy and cooled by water flow. Due to the rapid cooling process, this slag consists of crystalline defects and found to be alkali‐silica reactive according to previous studies and petrographic examination . The chemical analysis of the materials was done by X‐ray fluorescence and presented in Table .…”

Section: Experimental Workmentioning

confidence: 99%

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A comparative study between ASTM C1567 and ASTM C227 to mitigate alkali‐silica reaction

Saha

2018

Structural Concrete

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The primary objective of this study was to evaluate the two different widely adopted test methods such as american society for testing and materials (ASTM) C1567 “accelerated mortar bar method” and ASTM C227 “mortar bar method” to identify the alkali‐silica reaction (ASR) of ferronickel slag fine aggregates. The ASR mitigation measure was assessed by the application of supplementary cementing material such as fly ash. During the experimental investigation visual inspection, mortar bar expansion and tensile strength measurements were evaluated. The test results point out that mortar bar method was unsuccessful to identify the ASR due to significant alkali leaching during the experiment. On the other hand, accelerated mortar bar method was successful to identify ASR and able to determine the safe dosage of fly ash to mitigate this deleterious expansion.

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Section: Resultsmentioning

confidence: 57%

Section: Experimental Workmentioning

confidence: 99%

A comparative study between ASTM C1567 and ASTM C227 to mitigate alkali‐silica reaction

Saha

2018

Structural Concrete

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“…The average compressive strength decrease was 26%, which is expected because of the low calcium content of the fly ash. Although the mixtures with fly ash exhibited lower compressive strengths as compared to the concretes without fly ash, it was necessary to use fly ash as a mitigation of potential alkali silica reaction of the FNS aggregates . At 56 days of age, the compressive strengths were 44.2, 56.5, and 40.9 MPa for the mixtures FA‐FNS0, FA‐FNS50, and FA‐FNS100 respectively with standard deviations varying from 2.1 to 2.8 MPa.…”

Section: Resultsmentioning

confidence: 99%

“…The cement replacement was done by weight percentage to keep the water‐cement ratio consistent throughout the mixes. Fly ash was used to mitigate the potential alkali‐silica reaction of FNS . The mixtures are designated by PC‐FNS and FA‐FNS for no fly ash and 30% fly ash respectively.…”

Section: Methodsmentioning

confidence: 99%

Effect of elevated temperatures on concrete incorporating ferronickel slag as fine aggregate

2018

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Summary This study evaluates the effect of elevated temperature exposure on concrete incorporating ferronickel slag (FNS) as a replacement of natural sand. Concrete cylinders were exposed up to 800°C, and the changes in compressive strength, mass, ultrasonic pulse velocity (UPV), and microstructure were investigated. The concretes containing up to 100% FNS aggregate showed no spalling and similar cracking to that of the concrete using 100% natural sand. For exposures up to 600°C, the residual strengths of concretes containing 50% FNS were 7% to 10% smaller than the concrete with 100% sand. Use of 30% fly ash as cement replacement improved residual strength by pozzolanic reaction for exposures up to 600°C. An equation has been found from the correlation between residual strength and UPV. Therefore, UPV can be used as a nondestructive test to estimate the extent of postfire damage and residual strength of concrete incorporating FNS aggregate and fly ash.

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“…Seeing from Figure 3(a), there are not the newly formed cracks and pores in concrete during the temperature below 200°C, along with the evaporation of free water and physically absorbed water in hydration products [6]. When the temperature exceeds 400°C, the Ca(OH) 2 begins to decompose into CaO and H 2 O, as well as the microcracks in cement matrix and ITZ start to propagate and their intensity increases with temperature [6,40]. e obvious cracks can be observed on the concrete surface after water-cooling.…”

Section: Properties Of Concrete Exposed To Various Temperatures and Cmentioning

confidence: 99%

Effects of High Temperature and Cooling Pattern on the Chloride Permeability of Concrete

Duan

2019

Advances in Civil Engineering

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Concrete structure is frequently subjected to the fire attack, whereas the permeability of concrete with fire-damage has received little consideration. is paper aims to investigate the chloride permeability of plain concrete and recycled aggregate concrete (RAC) with fire-damage, and the effects of various cooling patterns and recuring treatment on the chloride permeability are also studied. e results manifest that the elevated temperatures result in an increase in the fire-damage and chloride permeability of concrete, and that the increase becomes more obvious with the temperature above 400°C. Attributing to the water-cooling which provides a recuring environment, the chloride permeability after water-cooling is lower than that after air-cooling when the temperature is 200°C. Whereas when the temperature is above 400°C, the chloride permeability after water-cooling becomes higher than that after air-cooling, due to an extra damage that the water-cooling produces. e recuring treatment can reduce the chloride permeability of concrete with fire-damage, and the reduction becomes more significant when the concrete suffers a serious fire-damage. Exposing to the same condition of high temperature, the addition of recycled aggregate (RA) further boosts the fire-damage and chloride permeability of concrete. Particularly, the chloride permeability increases with the increasing of RA replacement ratios, linearly, and the increased temperatures further lead to an increase in the slope of the fitting straight line.

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Potential alkali silica reaction expansion mitigation of ferronickel slag aggregate by fly ash

Cited by 24 publications

References 34 publications

A comparative study between ASTM C1567 and ASTM C227 to mitigate alkali‐silica reaction

A comparative study between ASTM C1567 and ASTM C227 to mitigate alkali‐silica reaction

Effect of elevated temperatures on concrete incorporating ferronickel slag as fine aggregate

Effects of High Temperature and Cooling Pattern on the Chloride Permeability of Concrete

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