Фибра и волокна
Cementitious materials are characterised by low tensile strength, low strain capacity and low fracture toughness: they are brittle materials. Reinforcement in the form of continuous steel bars and stirrups is used to resist imposed tensile and shear stresses in reinforced concrete which renders it a usable structural materia.
In the last five decades, another kind of reinforcement has been used to overcome the brittle ness, namely discontinuous and randomly distributed fibers, producing a new structural mate rial known as fiber reinforced concrete with improved strength, ductility and durability.
Фибро армированные бетоны
The term Fiber Reinforced Concrete (FRC) is defined as concrete made of hydraulic cements containing fine and coarse aggregates and discontinuous discrete fibers. It is important to recognize that, in general, fiber reinforcement is not a substitute for conventional reinforcement. The role of these two types of reinforcement is different in concrete; continuous steel bars are used to increase the tensile and shear capacities of concrete while the primary reason for addition of discontinuous fibers to the concrete matrix is to improve the post cracking response by controlling the crack opening and propagation.
FRC has been widely used in a variety of civil engineering applications including:
- pre-cast structural elements,
- shotcrete,
- machine foundation,
- hydraulic structures,
- pavements,
- seismic structures
- crash barriers.