Experimental investigation of the secondary creep of fiber reinforced concrete at high stress: Macroscopic measurement and digital image correlation

  • Pham Duc Tho Faculty of Civil Engineering, Hanoi University of Mining and Geology, 18 Vien street, Bac Tu Liem district, Hanoi, Vietnam
  • Tran Manh Tien Department of Mechanisms of Materials, Hanoi University of Mining and Geology, 18 Vien street, Bac Tu Liem district, Hanoi, Vietnam
  • Dang Trung Thanh Faculty of Civil Engineering, Hanoi University of Mining and Geology, 18 Vien street, Bac Tu Liem district, Hanoi, Vietnam
  • Vu Minh Ngan Faculty of Civil Engineering, Hanoi University of Mining and Geology, 18 Vien street, Bac Tu Liem district, Hanoi, Vietnam
  • Vu Minh Ngoc Institute of Research and Development, Duy Tan University, 254 Nguyen Van Linh street, Thanh Khe district, Da Nang, Vietnam
  • Luca Sorelli Department of Civil Engineering, University Laval, Pavillon Adrien-Pouliot, 1065, av. de la Médecine, Québec, G1V 0A6, Canada
DOI: https://doi.org/10.31814/stce.huce(nuce)2022-16(1)-02
Keywords: fiber reinforced concrete, secondary concrete creep, damage, digital image correlation

Abstract

The secondary creep of Fiber-Reinforced Concrete (FRC) under high sustained stress levels is a key issue for structural durability when considering the capacity to guarantee small crack widths under serviceability states. This study investigates the time-dependent deformation of FRC beams under loading level Ps/P0 greater than 80% (Ps is the load at reloading and P0 is the load before unloading) with various aggregate sizes by using both the classical macroscopic measurement and the digital image correlation analysis (DIC). Notched beams made of FRC and Fiber Reinforced Mortar (FRM) (i.e. without aggregate) were firstly pre-cracked by static load and then applied by a loading equal to 80% of strength. The evolution of the deflection, the crack width, and the crack propagation were both measured by traditional sensors and calculated by DIC. Comparison between results from FRC and FRM materials highlights the influence of microstructure heterogeneity on the secondary creep of FRC. Moreover, the DIC analysis helps to get insights on the secondary creep mechanism.

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Published
26-01-2022
How to Cite
Tho, P. D., Tien, T. M., Thanh, D. T., Ngan, V. M., Ngoc, V. M., & Sorelli, L. (2022). Experimental investigation of the secondary creep of fiber reinforced concrete at high stress: Macroscopic measurement and digital image correlation. Journal of Science and Technology in Civil Engineering (JSTCE) - HUCE, 16(1), 19-28. https://doi.org/10.31814/stce.huce(nuce)2022-16(1)-02
Issue
Vol 16 No 1 (2022)
Section
Research Papers

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