OVERVIEW OF RECENT ADVANCEMENTS IN FRC KNOWLEDGE AND APPLICATIONS, WITH SPECIFIC REFERENCE TO HIGH TEMPERATURE

摘要

The increasing requirements for strength and durability in constructions and infrastructures are being met today by the development of highly-innovative cementitious composites, that are suitable to be employed in severe or even extreme environmental conditions, because of low/high temperature, fatigue, dynamic loading and corrosive chemicals. Several examples can be quoted: containment shells, off-shore platforms, bridges, slabs-on-grade, pavements, tunnel linings and soil-retention walls. In the design and construction of all these structures, fiber-reinforced concrete is in the front line, since fibers are a technologically-simple and economically-sound way to increase concrete toughness (steel macrofibers), to control cracking (steel and inorganic microfibers), and to decrease concrete temperature-, fatigue- and impact-sensitivity (polymeric and steel fibers). After an overview of the advancements in the domain of FRC and FRC structural members resulting from the proceedings of the specialty conferences, symposia and workshops held in the last 10-15 years, the thermal and mechanical properties of FRC subjected to high temperature and fire, as well as those after a thermal cycle, are discussed, and some new findings are presented.