Compressive strength, flexural strength, and durability of high-volume fly ash concrete

Babalu, Rajput; Agarwal, Ashish; Sudarshan, Kore; Amol, Pawar

doi:10.1007/s41062-023-01120-x

Cited by 15 publications

(12 citation statements)

References 26 publications

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“…The observed increase in strength at later ages of FA concrete is primarily attributed to the higher compactness resulting from the increased pozzolanic activity of fly ash with time [ 26 ]. However, it is essential to note that the results for concrete with a higher FA percentage (FA30) exhibited a negative effect across all ages, a trend consistent with other studies [ [84] , [85] , [86] ]. The decline in strength has been widely linked to a greater proportion of cement being replaced by FA, which reduces its cementing efficiency.…”

Section: Resultssupporting

confidence: 88%

Concrete incorporating supplementary cementitious materials: Temporal evolution of compressive strength and environmental life cycle assessment

Yaseen,

Alcivar-Bastidas,

Irfan-ul-Hassan

et al. 2024

Heliyon

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Section: Resultssupporting

confidence: 88%

Concrete incorporating supplementary cementitious materials: Temporal evolution of compressive strength and environmental life cycle assessment

Yaseen,

Alcivar-Bastidas,

Irfan-ul-Hassan

et al. 2024

Heliyon

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“…Systematic reviews and research articles addressing the behavior of concrete incorporating high-volume F-FA are still in focus [25][26][27][28][29][30]. Recent trends have shown researchers promoting F-FA utilization by up to 70% [30][31][32][33]. Limited studies focus on the long-term durability of concretes containing F-FA greater than 50% [29,34].…”

Section: Introductionmentioning

confidence: 99%

The Durability of High-Volume Fly Ash-Based Cement Composites with Synthetic Fibers in a Corrosive Environment: A Long-Term Study

et al. 2023

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The utilization of class F fly ash (F-FA) is limited to 15–30% as a substitution for cement. The study intends to tap into the potential of high-volume F-FA as a pozzolan and micro filler by eliminating aggregates. The article presents the long-term behavior of a novel cement composite called no-aggregate concrete (NAC), incorporating 20% ordinary Portland cement (OPC) and 80% F-FA, with polypropylene (PP) fibers in 0.6, 0.8, and 1.0% volume fractions, in a corrosive environment. The bulk diffusion of preconditioned 100 mm cubes reveals that all mixtures’ chloride-binding capacity increases significantly with prolonged exposure. The total chloride content for mixtures M1, M2, and M3 is within acceptable limits as per EN 206. M4 with 1.0% PP fibers shows a higher total chloride content at 2 cm depth. The average chloride content for all mixtures is within 0.4%. The compressive strength of mixtures cured in water is about 90 MPa at 730 days, and is severely affected in the absence of fibers in a corrosive environment. The microstructure of mixtures at 730 days displays a cohesive, compact, continuous matrix, and the presence of unreacted F-FA.

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“…However, the review noted that the drop in flexural strength due to an increase in FA content is still a concern in HFVA binders regardless of the promising findings illustrated in Table 1. For instance, Babalu et al (2023) [35] reported results indicating an increase in flexural strength with FA content but only up to 30 wt% FA, beyond which they noted a drop. Kumar et al (2005) [36], whose results were consistent with the finding of Babalu et al (2023) [35] and other studies that reported a 3.75% and 7.30% flexural strength drop for mixes containing 50% and 60% FA, respectively [7,37].…”

Section: Flexural Strength Testmentioning

confidence: 99%

“…For instance, Babalu et al (2023) [35] reported results indicating an increase in flexural strength with FA content but only up to 30 wt% FA, beyond which they noted a drop. Kumar et al (2005) [36], whose results were consistent with the finding of Babalu et al (2023) [35] and other studies that reported a 3.75% and 7.30% flexural strength drop for mixes containing 50% and 60% FA, respectively [7,37]. In Babalu et al (2023) [35], a 90-day drop in flexural strength at 50% and 60% FA was reported as 4.5% and 11.93%, respectively, while in Siddique (2003) [1,38], a 43.63% drop in flexural strength was reported.…”

Section: Flexural Strength Testmentioning

confidence: 99%

Strength and Durability Properties of High-Volume Fly Ash (HVFA) Binders: A Systematic Review

Runganga,

Okonta,

Musonda

2024

CivilEng

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South Africa is endowed with a wealth of coal-fired power stations that can produce extremely high volumes of fly ash per year exceeding 34 million tonnes. The use of high-volume fly ash (HVFA) binders in the construction sector has the capacity to significantly reduce greenhouse gas emissions associated with traditional cement production and offset the carbon footprint of Eskom. The excessive production of fly ash by Eskom warrants the need for developing ultra-high-volume fly ash binders (UHVFA, fly ash/binder > 60 wt%). Nonetheless, fly ash (FA) replacement of cement is still largely limited to 35% regardless of more ambitious research indicating the potential to surpass 60%. In view of the urgent need for South Africa to offset and reduce its carbon footprint, this work reviews and summarises the literature on the performance of HVFA binders with a focus on two specific areas: (i) strength and (ii) durability. On HVFA binder strength, the focus is drawn on work that analysed the compressive strength, flexural strength, and split tensile strength. This review focuses on the extant literature analysing the durability of HVFA binders using various tests, including sorptivity, resistivity, permeability, tortuosity, rapid chloride penetration tests, resistance to sulphate attack, and microstructural analysis. As the FA content increases towards optima, i.e., 50–80%, the most indicative composite characteristics of the strength and durability properties are UCS (30–90 MPa) and permeability (low). This review reveals the leading methodologies, instrumentation, findings, challenges, and contradictions.

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Compressive strength, flexural strength, and durability of high-volume fly ash concrete

Cited by 15 publications

References 26 publications

Concrete incorporating supplementary cementitious materials: Temporal evolution of compressive strength and environmental life cycle assessment

Concrete incorporating supplementary cementitious materials: Temporal evolution of compressive strength and environmental life cycle assessment

The Durability of High-Volume Fly Ash-Based Cement Composites with Synthetic Fibers in a Corrosive Environment: A Long-Term Study

Strength and Durability Properties of High-Volume Fly Ash (HVFA) Binders: A Systematic Review

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