TY - JOUR

T1 - Influence of Synthetic Fibers on the Flexural Properties of Concrete

T2 - Prediction of Toughness as a Function of Volume, Slenderness Ratio and Elastic Modulus of Fibers

AU - Del Savio, Alexandre Almeida

AU - Esquivel, Darwin La Torre

AU - de Andrade Silva, Flávio

AU - Agreda Pastor, Joaquín

N1 - Funding Information:
This research received no specific grant from any funding agency in the public, commercial, or not-for-profit sectors.
Publisher Copyright:
© 2023 by the authors.

PY - 2023/2

Y1 - 2023/2

N2 - The construction industry requires concrete with adequate post-cracking behavior for applications such as tunnels, bridges, and pavements. For this reason, polypropylene macrofibers are used, which are synthetic fibers that fulfill the function of providing residual strength to concrete. In this study, an experimental plan is carried out to evaluate the bending behavior of concrete reinforced with polypropylene fibers using the four-point bending test according to ASTM C1609. Three fiber dosages (3.6, 7.2 and 10.8 kg/m3) and three fiber lengths (40, 50, and 60 mm) were used. The use of macro polypropylene fibers increased the post-cracking behavior of concrete. In addition, based on the experimentally obtained results and available literature data, a multivariable equation was developed to predict the concrete toughness as a function of the volume, slenderness, and modulus of elasticity of the fibers. A Pearson’s correlation coefficient, r of 0.90, showed a strong correlation between the developed equation and the experimental data. From this equation, it was possible to determine the participation of the following parameters in calculating toughness. The participation or weight of the fiber’s modulus of elasticity on the concrete’s tenacity is 26%, the volume of the fiber is 39%, the slenderness is 19%, and the reinforcement index is 16%.

AB - The construction industry requires concrete with adequate post-cracking behavior for applications such as tunnels, bridges, and pavements. For this reason, polypropylene macrofibers are used, which are synthetic fibers that fulfill the function of providing residual strength to concrete. In this study, an experimental plan is carried out to evaluate the bending behavior of concrete reinforced with polypropylene fibers using the four-point bending test according to ASTM C1609. Three fiber dosages (3.6, 7.2 and 10.8 kg/m3) and three fiber lengths (40, 50, and 60 mm) were used. The use of macro polypropylene fibers increased the post-cracking behavior of concrete. In addition, based on the experimentally obtained results and available literature data, a multivariable equation was developed to predict the concrete toughness as a function of the volume, slenderness, and modulus of elasticity of the fibers. A Pearson’s correlation coefficient, r of 0.90, showed a strong correlation between the developed equation and the experimental data. From this equation, it was possible to determine the participation of the following parameters in calculating toughness. The participation or weight of the fiber’s modulus of elasticity on the concrete’s tenacity is 26%, the volume of the fiber is 39%, the slenderness is 19%, and the reinforcement index is 16%.

KW - ASTM C1609

KW - fibers

KW - polypropylene macrofibers

KW - post-cracking behavior

KW - residual strength

KW - synthetic macrofibers

KW - toughness

UR - http://www.scopus.com/inward/record.url?scp=85149035550&partnerID=8YFLogxK

U2 - 10.3390/polym15040909

DO - 10.3390/polym15040909

M3 - Artículo (Contribución a Revista)

AN - SCOPUS:85149035550

SN - 2073-4360

VL - 15

JO - Polymers

JF - Polymers

IS - 4

M1 - 909

ER -