Effect of Basalt/Steel Individual and Hybrid Fiber on Mechanical Properties and Microstructure of UHPC.

Materials (Basel)

Jiangsu SinoRoad Transportation Science and Technology Co., Ltd., Nanjing 211806, China.

Published: July 2024

AI Article Synopsis

  • Ultra High-Performance Concrete (UHPC) is a strong and durable material, where the addition of fibers like basalt (BF) and steel (SF) enhances its properties.
  • Individual use of BF shows better fluidity and increases certain strengths, with an optimal dosage of 1%, while SF boosts toughness but may lower splitting tensile strength at high dosages.
  • In a hybrid mix, substituting BF for SF can improve mechanical properties, with an ideal composition being 0.5% BF and 1.5% SF, resulting in a denser microstructure and better fiber-matrix interface.

Article Abstract

Ultra High-Performance Concrete (UHPC) is a cement-based composite material with great strength and durability. Fibers can effectively increase the ductility, strength, and fracture energy of UHPC. This work describes the impacts of individual or hybrid doping of basalt fiber (BF) and steel fiber (SF) on the mechanical properties and microstructure of UHPC. We found that under individual doping, the effect of BF on fluidity was stronger than that of SF. Moreover, the compressive, flexural, and splitting tensile strength of UHPC first increased and then decreased with increasing BF dosage. The optimal dosage of BF was 1%. At a low content of fiber, UHPC reinforced by BF demonstrated greater flexural strength than that reinforced by SF. SF significantly improved the toughness of UHPC. However, a high SF dosage did not increase the strength of UHPC and reduced the splitting tensile strength. Secondly, under hybrid doping, BF was partially substituted for SF to improve the mechanical properties of hybrid fiber UHPC. Consequently, when the BF replacement rate increased, the compressive strength of UHPC gradually decreased; on the other hand, there was an initial increase in the fracture energy, splitting tensile strength, and flexural strength. The ideal mixture was 0.5% BF + 1.5% SF. The fluidity of UHPC with 1.5% BF + 0.5% SF became the lowest with a constant total volume of 2%. The microstructure of hydration products in the hybrid fiber UHPC became denser, whereas the interface of the fiber matrix improved.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11243560PMC
http://dx.doi.org/10.3390/ma17133299DOI Listing

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