Fibers as Structural Element for the Reinforcement of Concrete

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Fibers as Structural Element for the Reinforcement of Concrete

The idea of using a fibrous material to provide tensile strength to a material strong in compression but brittle, looses itself in the mists of time; in ancient Egypt straw was added to clay mixtures in order to provide bricks with enhanced flexural resistance, thus providing better handling properties after the bricks had been dried in the sun.
Other historical cases of fiber reinforcement exist: plaster reinforced with horsehair, or again with straw in the poorest building conditions, so as to avoid the unsightly occurrence of cracks due to shrinkage, counter-ceilings made of plaster reinforced through reed canes, cement conglomerates fiber-reinforced through asbestos, etc.
But the scientific approach to such a problem is definitely more recent.

The presence of fibers having adequate tensile strength, and being homogeneously distributed within concrete, builds a micro-scaffolding that, on the one side, demonstrates itself being efficient in counteracting the known phenomenon leading to crack formation due to shrinkage, and, on the other side, leads the concrete’s ductility(1) to become increasingly relevant with increasing strength of the fibers. This provides the concrete with a high toughness(2) as well.

As it is known, in the vast majority of currently applied calculation and verification rules, the concrete’s tensile strength is generally neglected in the calculation route, given concrete’s brittle behaviour. The use of a fiber-reinforced matrix makes it possible to stabilize tensile properties. In this way, the tensile strength can be now be exploited as well between other mechanical

MACCAFERRI

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MACCAFERRI

ผู้อัพโหลด : tumcivil

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