International Journal of Advance Engineering and Research Development (IJAERD) Volume 4, Issue 12, December-2017, e-ISSN: 2348 - 4470, print-ISSN: 2348-6406 The strains in the slab specimens are measured by using strain gauges placed at the mid span of the slab. The strains are small up to first crack load after that increases with the increase in load. Comparison of the strains between natural aggregate slabs and recycled coarse aggregate slabs is shown in the figure below.
(pt=0.3)
(pt=0.3)
80
60 40 0.3
20
60
Load (kN)
Load (kN)
80
40 0.3
20
r0.3
0
r0.3 0
0
200
400
600
0
200
Strain (µm/m)
(pt=0.4)
60 40 20
0.4
0
r0.4 400
600
Load (kN)
Load (kN)
80
200
100 80 60 40 20 0
0.4 r0.4 0
Strain (µm/m)
500 Strain (µm/m)
0.5 r0.5 1000
Strain (µm/m)
Load (kN)
Load (kN)
100 80 60 40 20 0 500
1000
(pt=0.5)
(pt=0.5)
0
600
Strain (µm/m)
(pt=0.4)
0
400
100 80 60 40 20 0
0.5 r0.5 0
500
1000
Strain (µm/m)
Figure.7 Strain profile for each percentage of steel of slab specimens From the graphs, it shows at a particular load point i.e., up to first cracking load, the strain variation in slabs with natural aggregate and recycled aggregate was small beyond that the variation was increased. This phenomenon may be due to less bonding between the aggregate in recycled aggregate specimens compared to natural aggregate specimens. 3.4 Crack Width Behaviour of The Slabs:
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