Ultra-high modulus fibers

Fiber-reinforced concrete (FRC) is concrete containing fibrous material which increases its structural integrity. It contains short discrete fibers that are uniformly distributed and randomly oriented. Fibers include steel fibers, glass fibers, synthetic fibers and natural fibers – each of which lend varying properties to the concrete. In addition, the character of fiber-reinforced concrete changes with varying concretes, fiber materials, geometries, distribution, orientation, and densities.

Fibers are usually used in concrete to control cracking due to plastic shrinkage and to drying shrinkage.

They also reduce the permeability of concrete and thus reduce bleeding of water. Some types of fibers produce greater impact–, abrasion–, and shatter–resistance in concrete. Generally fibers do not increase the flexural strength of concrete, and so cannot replace moment–resisting or structural steel reinforcement. Indeed, some fibers actually reduce the strength of concrete.

GLAS FIBERS –

Glass fiber reinforced polymer (GFRP) has a very important role to play as reinforcement in concrete structures which is exposed to harsh environment conditions where traditional steel reinforcement could corrode. It was found that the unique physical properties of GFRP that made it suitable for applications where conventional steel would be unsuitable. Compressive strength, flexural strength and split tensile strength for these AR glass fibers are more as compared to other glass fibers.

Ultra-high modulus fiber reinforced concrete

It stands for concretes with compressive strengths exceeding 150 MPa. The concrete composition includes a high cement content, mineral admixture (usually silica fume), steel fibers and a very low water/binder ratio ensured by the use of last generation superplasticizers. UHPFRC incorporates very fine sands or quartz sands with granule size up to 1 mm. Besides the superior physical-mechanical properties compared with ordinary concrete and even high strength concrete, Ultra high Ultra high modulus fiber reinforced concrete presents very good ductility and durability properties

major ultra high modus fibers

Carbon fiber

Aramid

Glass

Comparing the properties of all of the fibre types with each other, shows that they all have distinct advantages and disadvantages. This makes different fibre types more suitable for some applications than others. The following table provides a basic comparison between the main desirable features of generic fibre types. 'A' indicates a feature where the fibre scores well, and 'C' indicates a feature where the fibre is not so good.