Effect of Addition of Fly Ash on Shrinkage Characteristics in High Strength Concrete

Kate, Gunavant K.; Murnal, Pranesh

doi:10.47893/ijatce.2012.1041

Cited by 3 publications

(3 citation statements)

References 8 publications

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Section: Concrete Shrinkagementioning

confidence: 99%

“…Assuming regular concrete strength, autogenous shrinkage as well as the early-age strength of concrete, will decrease with the addition of fly ash[39,40]. Conversely, high-strength concrete will exhibit increased shrinkage under the same conditions[41].Current research on shrinkage primarily focuses on a deeper understanding of autogenous and drying shrinkage[31], particularly in construction stages[42], using new types of cement[43], or with different types of concrete mixtures with different admixtures: various types of aggregate, fibres, etc [44]…”

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confidence: 99%

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Long-Term Effects in Structures: Background and Recent Developments

Harapin,

Jurišić,

Bebek

et al. 2024

Applied Sciences

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This article addresses the often overlooked but critical long-term factors of creep, shrinkage, ageing and corrosion in civil engineering structures. The paper emphasizes their substantial impact on structural mechanical resistance and safety, drawing attention to key examples like the Civic Tower in Pavia, the Koror-Babeldaob Bridge and dams in the USA. By exploring the challenges faced in modern engineering, the article sheds light on the need to consider these effects. Various models for predicting creep and shrinkage in concrete structures are introduced as potential solutions. In conclusion, the paper highlights the necessity for engineers to navigate the intricacies of material behaviour for successful construction amidst evolving challenges.

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Section: Concrete Shrinkagementioning

confidence: 99%

mentioning

confidence: 99%

Long-Term Effects in Structures: Background and Recent Developments

Harapin,

Jurišić,

Bebek

et al. 2024

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…If we assume the concrete of regular strength, autogenous shrinkage as well as the early-age strength of concrete, will be reduced with the addition of y ash [30,31]. On the other hand, high strength concrete will increase its shrinkage in the same conditions [32].…”

Section: Concrete Shrinkagementioning

confidence: 99%

Long-Term Effects in Structures: background and recent developments

Harapin

Jurišić

Bebek

et al. 2022

Preprint

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The article presents overview of selected long-term effects in civil-engineering structures. Those effects are usually neglected in standard engineering practice, but in some cases can be very important for mechanical resistance and safety of the structures. Main aspects of these phenomena are discussed, with three illustrative examples which accentuated why is important to take them into account.

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Optimizing the usage of fly ash in concrete mixes

Zulu¹

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Improving on our construction practices to promote sustainable development in engineering and to promote eco-friendly living is vital in the fight against global warming and associated problems. This study looked at one of the ways in which engineering can contribute to this fight through promoting the recycling of waste by-products such as fly ash (FA), on a larger scale in the cement and concrete industry, by utilizing the FA to the optimum. In this study concrete mixes of 25 MPa, 35 MPa and 50 MPa with FA partially substituting the cement at 30%, 40%, 50% and 60% were produced and numerous tests were performed to determine the optimum amount of FA that can be used and still obtain better or comparable concrete to ordinary concrete. Testing for concrete properties was conducted under laboratory conditions over a period of one year. In addition, a cost comparison between ordinary concrete and FA concrete was undertaken. The results obtained show that the increase in FA content influenced the rheological properties of fresh concrete favorable. The recorded slump increased with the increase of FA content. Increasing the FA content prolonged the setting of concrete, with the ordinary concrete taking 1 hour 45 min to set, compared to more than 2 hours for FA mixes. The FA increase had negligible effects on the air content of the concrete mixes. The drying shrinkage of concrete increased with the increase of FA content, with the strain ranging from 0,045% to 0,56%. The compressive strength results show that the control mixes with 30% FA content attained the highest compressive strength over a year. In some cases, the 40% FA strength was compatible to the 30% FA strength. The durability index results showed the control mix of 30% FA attaining better results for Oxygen Permeability Index and Sorptivity Index, with the 40% FA mix following closely. The higher FA content mixes (50% and 60%) attained better Chloride Conductivity results than the lower FA content mixes. Increasing the FA content does affect the performance of the concrete at early stages, however concrete with acceptable strength and good durability qualities can be produced even with 50% FA volume. Increasing the FA content can also significantly reduce the cost of producing and working with concrete. The practice of utilizing higher FA content in concrete can be beneficial for the South African cement and concrete industry without compromising the quality of the cement products concrete structures.

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Effect of Addition of Fly Ash on Shrinkage Characteristics in High Strength Concrete

Cited by 3 publications

References 8 publications

Long-Term Effects in Structures: Background and Recent Developments

Long-Term Effects in Structures: Background and Recent Developments

Long-Term Effects in Structures: background and recent developments

Optimizing the usage of fly ash in concrete mixes

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