PSI - Issue 60

Swathy S et al. / Procedia Structural Integrity 60 (2024) 591–603

600 10

Swathy S et.al / Structural Integrity Procedia 00 (2019) 000 – 000

Fig 11 Load capacity of three slab specimens.

3.3 Cracking pattern During the initial stage of loading all the specimen were devoid of cracks, crack progressed vertically at top surface of the slab SP1-CS at the load level and then the crack got increased. When the load got increased along with some vertical width crack that is longitudinal direction crack some 45-degree crack also developed and extend towards the edge of the slab. This behaviour is almost same in all specimens, when the load gets increased the slab experienced some vertical and shear crack at the edge and corners. The propagation of these cracks is limited and the slab got failed. Comparing the strengthen specimen SP2-SBF with SP1-CS the crack like both longitudinal and shear crack has propagated but it’s very less when compared to the control specimen and the string is not pulled out of the slab even a maximum line load is applied over the slab specimen. The strengthened slab has withstood a maximum load without formation of retraction and shear cracks and the shear cracks got reduced when compared to the control specimen. The addition of polypropylene fibre into the concrete mix design has increased the ductility of the slab against failure.

(a) SP1-CS

(b) SP3-SBL