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Advances in Concrete Construction Volume 15, Number 3, March 2023 , pages 161-170 DOI: https://doi.org/10.12989/acc.2023.15.3.161 |
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 open accessEffect of fiber content on the performance of UHPC slabs under impact loading - experimental and analytical investigation |
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Muhammad Umar Khan, Shamsad Ahmad, Mohammed A. Al-Osta, Ali Husain Algadhib and Husain Jubran Al-Gahtani
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| Abstract | ||
| Ultra-high-performance concrete (UHPC) is produced using high amount of cementitious materials, very low water/cementitious materials ratio, fine-sized fillers, and steel fibers. Due to the dense microstructure of UHPC, it possesses very high strength, elasticity, and durability. Besides that, the UHPC exhibits high ductility and fracture toughness due to presence of fibers in its matrix. While the high ductility of UHPC allows it to undergo high strain/deflection before failure, the high fracture toughness of UHPC greatly enhances its capacity to absorb impact energy without allowing the formation of severe cracking or penetration by the impactor. These advantages with UHPC make it a suitable material for construction of the structural members subjected to special loading conditions. In this research work, the UHPC mixtures having three different dosages of steel fibers (2%, 4% and 6% by weight corresponding to 0.67%, 1.33% and 2% by volume) were characterized in terms of their mechanical properties including facture toughness, before using these concrete mixtures for casting the slab specimens, which were tested under high-energy impact loading with the help of a drop-weight impact test setup. The effect of fiber content on the impact energy absorption capacity and central deflection of the slab specimens were investigated and the equations correlating fiber content with the energy absorption capacity and central deflection were obtained with high degrees of fit. Finite element modeling (FEM) was performed to simulate the behavior of the slabs under impact loading. The FEM results were found to be in good agreement with their corresponding experimentally generated results. | ||
| Key Words | ||
| concrete damage plasticity model; fiber content; finite element modeling (FEM); fracture toughness; impact; UHPC | ||
| Address | ||
| (1) Muhammad Umar Khan, Shamsad Ahmad, Mohammed A. Al-Osta, Ali Husain Algadhib, Husain Jubran Al-Gahtani: Department of Civil & Env. Eng., KFUPM, Dhahran 31261, Saudi Arabia; (2) Muhammad Umar Khan: Department of Civil Engineering & Technology, Qurtuba University of Science and Information Technology, D.I. Khan 29150, Pakistan; (3) Shamsad Ahmad, Mohammed A. Al-Osta, Ali Husain Algadhib, Husain Jubran Al-Gahtani: Interdisciplinary Research Center for Construction and Building Materials, KFUPM, Dhahran 31261, Saudi Arabia. | ||
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