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Open AccessArticle

Effect of the Combination of Superabsorbent Polymers for Autogenous Shrinkage Control with Steel Fibers of High-Performance Concrete under Uniaxial Tension Using DIC

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Postgraduate Program in Structural Engineering and Construction–PECC, Department of Civil and Environmental Engineering, SG-12 Building, University of Brasilia–UnB, 70910-900 Brasília-DF, Brazil
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Materials Department, Nacional Laboratory for Civil Engineering–LNEC, Av. do Brasil 101, 1700-075 Lisbon, Portugal
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Department of Civil and Industrial Engineering, Faculty of Civil Engineering and Science, Pontifical Xavierian University of Cali, Calle 18 N° 118-250, Edificio Central, 2do. Piso, Cali 760031, Colombia
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Faculty of Civil Engineering–FECIV, Federal University of Uberlândia–UFU, Av. João Naves de Ávila, 2121, Santa Mônica Campus 1Y, 38400-902 Uberlândia-MG, Brazil
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The Alberto Luiz Coimbra Institute for Graduate Studies and Research in Engineering–COPPE, Department of Civil Engineering, University of Rio de Janeiro–UFRJ, Av. Horácio Macedo 2030, Ilha do Fundão, 21941-972 Rio de Janeiro, RJ, Brazil
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Author to whom correspondence should be addressed.
Materials 2020, 13(20), 4638; https://doi.org/10.3390/ma13204638
Received: 1 September 2020 / Revised: 3 October 2020 / Accepted: 13 October 2020 / Published: 17 October 2020
(This article belongs to the Special Issue Research and Development of Modified Building Materials)
This paper presents a study of the effect of a superabsorbent polymer (SAP) for autogenous shrinkage control on the uniaxial tensile behavior of steel fiber reinforced concrete (SFRC). The use of fibers and SAP potentially increases the durability of the concrete, preventing cracking by autogenous shrinkage and enhancing post-cracking behavior. Furthermore, SAP can provide further hydration for self-healing purposes and improve the ductility of the SFRC. In order to evaluate the effect of the addition of SAP in SFRC, dog-bone SFRC specimens with different dosages of superabsorbent polymers were cast and tested under uniaxial tension. The digital image correlation (DIC) technique was used to understand the effect of SAP on the steel fibers’ crack-bridging mechanisms. Surface strains and crack openings were inferred using the DIC technique. The effect of SAP and fibers on fresh and hardened concrete was individually investigated by flow tests and compressive strength tests. Autogenous shrinkage was measured in plain concrete to investigate the minimum SAP content required to mitigate autogenous shrinkage of 0.3%. The use of 0.3% SAP was also sufficient to reach multiple cracking behavior. This content of SAP completely suppressed the autogenous shrinkage with minimal side effects on compressive strength. An analytical formulation for the tensile behavior of SFRC was developed using the variable engagement model, presenting a mean correlation of R2 of 0.97 with the experimental results. View Full-Text
Keywords: superabsorbent polymer; steel fibers; high-performance fiber reinforced concrete; digital image correlation; autogenous shrinkage; tensile behavior superabsorbent polymer; steel fibers; high-performance fiber reinforced concrete; digital image correlation; autogenous shrinkage; tensile behavior
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Santos, K.F.; Ribeiro, A.C.B.S.; Silva, E.F.; Manzano, M.A.R.; Motta, L.A.C.; Toledo Filho, R.D. Effect of the Combination of Superabsorbent Polymers for Autogenous Shrinkage Control with Steel Fibers of High-Performance Concrete under Uniaxial Tension Using DIC. Materials 2020, 13, 4638.

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