technical newsletter iii

8/7/2019 Technical Newsletter III

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BUS STOP STATION : Montevideo, Uruguay

Dosage rate 20kg/m of Wirand FF1 + 600g/m ofFibroMac 12

Concrete Class fc 30MPa

Thickness of slab 19 cm

Maximun joint spacing 5 m

Finishing of pavement

Floorings / Pavements

The industrial floors, road pavements etc, are technically

considered as plates resting on the soil subjected to distributed,constant or moving loads that are traditionally reinforced to endure

shrinkage and temperature stresses. Design of ground supported

slabs with conventional reinforcement is based on elastic behaviour

of the slab. This approach should not be adopted for steel fibres as

the post cracking behaviour of SFRC is significantly different from

concrete with conventional reinforcement. In fact, the post cracking

behaviour of SFRC is a markedly non linear behaviour and softenswith volume fraction of fibres often used in practice (25 40 kg/

cu.m of concrete); the conventional reinforcement retains an almost

linear relation until the reinforcement yields.

Concrete behaviour SFRC behaviour

The steel fibres redistribute the stresses and, by modifying the

mechanism of formation and opening of cracks, make the concrete

more ductile, i.e. able to maintain a certain residual load-bearing

capacity even during the post-cracking phase.

Compared with conventional reinforced concrete, SFRC offers

following advantages:

Reduction of slab thickness (no cover requirement)

PCC/DLC concrete not necessary

Larger joint spacing

No error while placing reinforcement

Less maintenance Increased output

Strain

Brittle

Strain

Tough

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Concreting for pavementin progress

Steel fibres in concreteenhance durability as theycontrol crack widths. Since theyare discrete elements, the fibresonly at the surface undergocorrosion keeping the matriximpermeable to corrosiveeffects says G. Arvind, GM,New Business Development,

Maccaferri India.


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technical newsletter iii

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