Impact of maturation conditions for concrete on its compressive strength

Witkowska-Dobrev, Joanna; Szlachetka, Olga; Spiek, Paulina

doi:10.35784/bud-arch.1672

Cited by 2 publications

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“…Similar results were obtained in Witkowska-Dobrev et al, 57 where the influence of the care method, excluding the use of chemical compounds, on the compressive strength of ordinary concrete samples based on Portland cement and pozzolanic ash cement was investigated. Samples were placed in individual curing environments: in cuvettes with water, soaked and wrapped with construction foil, left in room conditions in the laboratory, placed outside the laboratory, and being exposed to the atmospheric conditions.…”

Section: Discussionsupporting

confidence: 85%

Influence of compressive strength and maturity conditions on shrinkage of ordinary concrete

Szlachetka

Witkowska-Dobrev

Dohojda

et al. 2021

Advances in Mechanical Engineering

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The paper presents results of investigations of compressive strength and shrinkage of concrete samples made on the basis of the Portland cement CEM I 32.5R, after 2, 7, 14, 28, 90, and 365 days of maturation in four different maturation conditions. It was shown that after 28 days the samples cured according to the standard in the cuvettes with water achieved the highest compressive strength, although the early-age compressive strengths after 7 and 14 days were lower than those for the samples cured in building film and in dry conditions. A determined correlation between the compressive strength and shrinkage of the concrete proves that wet curing also allows a total elimination of the shrinkage in the first 28 days. Along with the growth of the compressive strength, the drying shrinkage reduces. Obtained results confirmed that the best way of concrete curing, among the analyzed methods, from the point of view of both compressive strength and volume changes is the wet curing.

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Section: Discussionsupporting

confidence: 85%

Influence of compressive strength and maturity conditions on shrinkage of ordinary concrete

Szlachetka

Witkowska-Dobrev

Dohojda

et al. 2021

Advances in Mechanical Engineering

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Influence on Physical and Mechanical Properties of Concrete Using Crushed Hazelnut Shell

Gálvez Cartagena,

Muñoz Araya,

Yanez

et al. 2023

Applied Sciences

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Concrete production requires a significant amount of natural resources, with aggregates comprising between 55% and 80% of the total volume. However, the over-exploitation of natural aggregates has led to the exploration of alternative materials for use in concrete production. In this study, crushed hazelnut shells were investigated as a partial replacement for fine aggregate, addressing the problem of natural resource depletion and offering a second use for this important agricultural waste product available in Chile. Hazelnut shells were incorporated in percentages of 2.5%, 5%, and 10% by weight of sand for water/cement ratios of 0.4 and 0.5. The compressive strength at 7 and 28 days and bending strength at 28 days were determined, alongside physical properties such as the workability, temperature, air content, fresh density, and hardened density of the concrete. Our findings showed that replacing 2.5% of the fine aggregate with hazelnut shells led to a higher compressive strength at 28 days, exceeding the strength of the standard specimens by 9.5%, whereas replacing 5% of the fine aggregate led to the highest bending strength, exceeding the strength of the standard specimens by 3.5%. Moreover, the 0.4 w/c ratio consistently led to better results for both compressive and bending strength, with fewer and lower reductions in mechanical strength compared to the standard mixture. Our results suggest that concrete mixes with hazelnut shells as a replacement for fine aggregate at a percentage of up to 2.5% can be used in construction systems with a compression strength lower than 17 MPa, and mixtures with up to 10% hazelnut shell replacement can be used in structures with tensile bending stress requirements lower than 6 MPa. Overall, the use of hazelnut shells as a partial replacement for fine aggregate in concrete production presents an environmentally friendly and cost-effective solution for the construction industry.

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Impact of maturation conditions for concrete on its compressive strength

Cited by 2 publications

References 0 publications

Influence of compressive strength and maturity conditions on shrinkage of ordinary concrete

Influence of compressive strength and maturity conditions on shrinkage of ordinary concrete

Influence on Physical and Mechanical Properties of Concrete Using Crushed Hazelnut Shell

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