Mechanical performance and chloride ion penetration of polyolefin fiber reinforced concrete designed for shotcreting at marine environment

The Influence of the Hybridization of Steel and Polyolefin Fiber on the Mechanical Properties of Base Concrete Designed for Marine Shotcreting Purposes

“…These cases were more evident from specimens with higher steel fiber content (lower polyolefin fiber content). The higher charge passed values observed here were directly related to the electrical conductivity of steel fiber [10]. This is because (1) the same base concrete mix design was used, (2) the increase in charge passed is solely related to the increase in the amount of steel fiber in the base concrete, and (3) the average charge passed value of base concrete with 100% polyolefin fiber did not show clear differences with the increase in fiber volume.…”

“…To measure the chloride ion penetration of the base concrete, the ASTM C 1202 "Standard Test Method for Electrical Indication of Concrete's Ability to Resist Chloride Ion Penetration" and the NT Build 492 "Chloride Migration Coefficient from Non-Steady-State Migration Experiments" were used. The use of two different testing procedures was to comprehensively understand the chloride ion penetration resistance of the fiber reinforced base concrete because the amount of charge passed was found to be affected by the presence of the conductive material (steel fiber) in the concrete [10].…”

“…Polymeric fibers have also been used as an alternative to steel fibers because of a relatively low cost and better construction behavior, having some useful properties such as deformability and corrosion resistance [5,9]. However, due to their weaker mechanical properties than those of steel fibers, polymeric fibers do not provide higher mechanical performance than steel fibers when incorporated into concrete for reinforcement [10].…”

Performance of engineered fibre reinforced concrete (EFRC) under different load regimes: A review

“…In another study, the use of accelerators had a great impact on the mechanical properties of FRC [62]. Other researchers have noted that polyolefin fibres and accelerators can significantly improve the properties of reinforced concrete, specially for marine structure applications [63]. The selection of the correct type of accelerator is very important and highly challenging.…”