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http://dx.doi.org/10.12989/cac.2020.26.5.451

Experimental & numerical investigation of mechanical properties in steel fiber-reinforced UHPC  

Dadmand, Behrooz (Department of Civil Engineering, Razi University)
Pourbaba, Masoud (Department of Civil Engineering, Maragheh Branch, Islamic Azad University)
Sadaghian, Hamed (Department of Civil Engineering, University of Tabriz)
Mirmiran, Amir (Department of Civil Engineering, University of Texas at Tyler)
Publication Information
Computers and Concrete / v.26, no.5, 2020 , pp. 451-465 More about this Journal
Abstract
This paper presents experimental and numerical investigations on mechanical properties of ultra-high-performance fiber-reinforced concrete (UHPFRC) with four types of steel fibers; micro steel (MS), crimped (C), round crimped (RC) and hooked-end (H), in two fiber contents of 1% and 2% (by volume) and two lengths of 13 and 30 mm. Compression, direct tension, and four-point bending tests were carried out on four types of specimens (prism, cube, dog-bone and cylinder), to study tensile and flexural strength, fracture energy and modulus of elasticity. Results were compared with UHPC specimens without fibers, as well as with available equations for the modulus of elasticity. Specimens with MS fibers had the best performance for all mechanical properties. Among macro fibers, RC had better overall performance than H and C fibers. Increased fibers improved all mechanical properties of UHPFRC, except for modulus of elasticity, which saw a negligible effect (mostly less than 10%). Moreover, nonlinear finite element simulations successfully captured flexural response of UHPFRC prisms. Finally, nonlinear regression models provided reasonably well predictions of flexural load-deflection behavior of tested specimens (coefficient of correlation, R2 over 0.90).
Keywords
concrete; crimped fibers; steel fibers; ultra-high-performance concrete (UHPC); ultra-high-performance fiber-reinforced concrete (UHPFRC);
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Times Cited By KSCI : 4  (Citation Analysis)
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