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The Beneficial Effect of the Addition of Fly Ash on Reduction of the Size of Microcracks in the ITZ of Concrete Composites under Dynamic Loading

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  • Grzegorz Ludwik Golewski

    (Department of Structural Engineering, Faculty of Civil Engineering and Architecture, Lublin University of Technology, Nadbystrzycka 40 str., 20-618 Lublin, Poland)

Abstract

The paper presents results of tests on the effect of the addition of fly ash (FA) in the amounts of 0%, 20%, and 30% by weight of cement on the interfacial microcracks in concrete composites subjected to dynamic loads. The analyses were carried out based on the results of the microstructural tests using a scanning electron microscope (SEM). The average width of the microcracks ( W c ) in the interfacial transition zone (ITZ) of coarse aggregate with cement matrix was evaluated. During the studies beneficial effect of the addition of FA on reduction of the size of W c in the ITZ of concrete composites under dynamic loading were observed. Based on obtained test results, it was found that using the 20% FA additive causes favorable changes in the microstructure of mature concrete. In this composite, the average value of W c was lower by more than 40% compared to the result obtained for the reference concrete. In contrast, concrete containing 30% FA additive had greater microcracks in the ITZ area by over 60% compared to the material without additive. In all analyzed composites, an increase in the W c value by almost 70% to over 110% in the case of occurrence of dynamic loads was also observed. This was the most evident in the case of concrete with a higher content of FA.

Suggested Citation

  • Grzegorz Ludwik Golewski, 2021. "The Beneficial Effect of the Addition of Fly Ash on Reduction of the Size of Microcracks in the ITZ of Concrete Composites under Dynamic Loading," Energies, MDPI, vol. 14(3), pages 1-14, January.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:3:p:668-:d:488846
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    References listed on IDEAS

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    1. Grzegorz Ludwik Golewski, 2020. "Energy Savings Associated with the Use of Fly Ash and Nanoadditives in the Cement Composition," Energies, MDPI, vol. 13(9), pages 1-20, May.
    2. Xiaolei Yang & Fotis Sotiropoulos, 2019. "A Review on the Meandering of Wind Turbine Wakes," Energies, MDPI, vol. 12(24), pages 1-20, December.
    3. Hyun-Gi Kim & Bum-Joon Kim, 2020. "Design Optimization of Conical Concrete Support Structure for Offshore Wind Turbine," Energies, MDPI, vol. 13(18), pages 1-21, September.
    4. Bartosz Szostak & Grzegorz Ludwik Golewski, 2020. "Improvement of Strength Parameters of Cement Matrix with the Addition of Siliceous Fly Ash by Using Nanometric C-S-H Seeds," Energies, MDPI, vol. 13(24), pages 1-15, December.
    5. Hongbo Li & Hao Sun & Wanlong Zhang & Huiyan Gou & Qiuning Yang, 2019. "Study on Mechanical Properties of Self-Compacting Concrete and Its Filled in-Line Multi-Cavity Steel Tube Bundle Shear Wall," Energies, MDPI, vol. 12(18), pages 1-18, September.
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