Abstract
Polyolefin fiber-reinforced concrete (PFRC) has become an attractive alternative to steel for the reinforcement of concrete elements, mainly due to its chemical stability and the residual strengths that can be reached with lower weights. The use of polyolefin fibers can meet the requirements of standards, although the main constitutive relations are based on experience with steel fibers. Therefore, the structural contributions of the fibers should be assessed by inverse analysis. In this study, the fiber dosage was fixed at 6 kg/m3, and both self-compacting concrete and conventional concrete were used to compare the influence of the positioning of the fibers. An idealized homogeneous distribution of the fibers with such fibers crossing from side to side of the specimen was added to self-compacting concrete. The experimental results of three-point bending tests on notched specimens were reproduced by using the cohesive crack approach. Hence, constitutive relations were found. The significance of this research relies on the verification of the formulations found to build constitutive relations. Moreover, with these results, it is possible to establish a higher threshold for the performance of PFRC and the difficulties of limiting the first unloading branch typical of fracture tests of PFRC.
Highlights
Reinforced concrete was the most relevant construction material employed both in architecture and civil engineering during the 20th century
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SCC6-60 and VCC6-60 was notable before the post-peak maximum load was reached
Summary
Reinforced concrete was the most relevant construction material employed both in architecture and civil engineering during the 20th century. The improvement of the concrete properties that the fibers induce has enabled a large amount of uses, such as cracking control, fire spalling prevention, and multifunctional concretes [5,6,7], that enable applications such as guiding vehicles or heating pavements. In some of these uses, the metallic nature of steel fibers, which are the most common, might be an issue due to their potential corrodible and magnetic nature. In order to address such situations, certain types of polymeric fibers, which can be considered to be structural ones, have recently been developed Those fibers provide structural capacities with lower dosages and are essentially polyolefin-based macrofibers. Relevant research has been developed regarding the characterization of the mechanical properties of polyolefin fiber-reinforced concrete (PFRC) [8,9,10,11,12,13,14,15,16,17] and its engineering applications [18,19,20,21,22]
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