PSI - Issue 60

Swathy S et al. / Procedia Structural Integrity 60 (2024) 591–603 Swathy S et al./ Structural Integrity Procedia 00 (2019) 000 – 000

599

9

3.2 Load carrying capacity of slab

Load carrying capacity is assessed in the slab specimen by applying line load that is the impact loading over the slab using an I-section beam of length 1m and the load carrying capacity of the slab is used to determine the maximum load that the slab specimen can withstand when compared to the design load by analysis. The load carrying capacity of the strengthened and the unstrengthen slab is determined. Fig 11 shows the load carrying capacity of three slab specimen in which two slabs are strengthened using various strengthening methods and third slab is not strengthened and it act as a control specimen to compare the load carrying capacity. Table 3 shows the test result of load carrying capacity of control and the strengthened slab. SP1-CS slab which is the control specimen can withstand a load upto 31T when loaded against line loading. This slab is without any strengthening technique and the maximum load obtained for this slab is much higher than the designed load capacity calculated for the mix design of the concrete. SP2-SBF slab has the load carrying capacity of around 44.5 T and the strengthened slab has withstood a maximum load then the control specimen. This is due to the orientation of basalt string fan that is used as a strengthening for slab here. SP3-SBL slab which is strengthened with basalt laminate has carried a maximum load of 48.5 T and is much higher than the control slab. This is due to the basalt laminates applied over the top and bottom surface of the slab and that has withstood a maximum load against line loading. Fig 12 shows loading value.

Table 3 Details of Test specimens. Slab Dimension

Strengthener type

Dimension of strengthener

Load carrying capacity (Tonnes)

Plane dim (mm) Thickness (mm)

SP1-CS SP2-SBF SP3-SBL

1200 x1200 1200 x1200 1200 x1200

135 135 135

None

None

31

BFRP string Basalt strip

704 mm 2

44.5 48.5

1000 x 100 mm

Fig 12 Loading value

Fig 10 Compressive strength curve of both specimen with and without fibre