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Fiber reinforced concrete has all but completely replaced bar in underground construction industry such as tunnel segments where almost all tunnel linings are fiber reinforced in lieu of using rebar. This may, in part, be due to issues relating to oxidation or corrosion of steel reinforcements.
This occurrence is hindered by the presence of fiber bridging, a property that most HPFRCCs are specifically designed to possess. Fiber bridging is the act of several fibers exerting a force across the width of a crack in an attempt to prevent the crack from developing further. This capability is what gives bendable concrete its ductile properties.
Plant fibers are a promising area but they are subjected to degradation in the alkaline environment and elevated temperatures during cement hydration. [3] [4] In international literature, FRCMs are also called textile-reinforced concrete (TRC), textile reinforced mortars (TRM), fabric-reinforced mortar (FRM), or inorganic matrix-grid composites ...
The fibres used for making the fabric are of high tenacity like jute, glass fibre, Kevlar, polypropylene, polyamides (Nylon) etc. Recently, attention has been given to the use of plant-based fibers (either dispersed or as a fabric) in reinforcement of concrete.
When combining plant fibers with mortars, one must pay attention to potential hydrolysis of hemicelluloses and lignin [3] [4]. Compared to other composite materials used in seismic retrofitting such as fibre-reinforced polymers (FRP), [5] the fibre sheets are replaced by open-grid textiles and the epoxy resin is replaced by mortar. The synergy ...
The addition of 1 kg/m 3 of polypropylene fibers to concrete has been shown to reduce spalling during a simulated fire. [44] (The improvement is thought to be due to the formation of pathways out of the bulk of the concrete, allowing steam pressure to dissipate. [44]) Another problem is the effectiveness of shear reinforcement.
To give concrete the ability to resist being stretched, steel bars, which can resist high stretching (tensile) forces, are often added to concrete to form reinforced concrete. [20] Fibre-reinforced polymers include carbon-fiber-reinforced polymers and glass-reinforced plastic. If classified by matrix then there are thermoplastic composites ...
ECC, unlike common fiber reinforced concrete, is a family of micromechanically designed materials. [2] [3] As long as a cementitious material is designed/developed based on micromechanics and fracture mechanics theory to feature large tensile ductility, it can be called an ECC.
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