Page 14 - Open-Access-June-2020

TECHNICAL PAPER

Table 6: Flexural Behavior of ECC Strengthened RC Elements

eCC
type of sl. type of dimensions loCation
speCimen no. referenCe reinforCement (b×d×l) (mm) of eCC thiCkness oBservation
*
(mm)
1. Zhang et al. [58] No reinforcement 100 × 100 × tension face 25 & 50 i) The flexural strength of strengthened
500 beams enhanced 18.2% and 43.2% for
ECC layer of 25 and 50mm, respectively.
ii) The average deflection increased 64%
and 200% for ECC layer of 25 and 50mm,
respectively than plain beam.
2. Shin et al. [59] No reinforcement 100 × 100 × tension face 10, 20 & 30 For different ECC thickness, the peak load
400 enhanced 36 to 80% and its corresponding
deflection enhanced 25 to 116% than plain
beam.
3. Leung et al. [67] No reinforcement 100 × 100 × tension face 0, 25 & 50 The average deflection of layered ECC
500 concrete beam enhanced 64% and 200% for
25 mm and 50 mm ECC layer, respectively.

Beams 4. Shin et al. [63] Steel reinforcement 160 × 160 × extreme 25 & 50 i) The strengthened beams exhibits
1200 tensile zone enhanced load carrying capacity
and deflection of 9.5% and 34.4%,
respectively than RC beams.
ii) In strengthened beams, the maximum
crack width decreases 75.2 to 95% than
RC beams.
5. Yi et al. [68] Steel, carbon 120 × 300 × underside 20 In most of the beams the crack width are
fiber sheets, FRP 1000 observed as 0.05 mm and the maximum
grid along with crack width of 0.1mm was observed.
NEFCRETE & FRP
grid.
6. Hussein et al. [65] steel reinforcement 200 × 200 × tension face 50 The ultimate load increases 68%, 81% and
1800 106% for a reinforcement ratio of 0%, 0.3%
and 0.8%, respectively than plain beam.
7. Singh and steel reinforcement 100 × 120 × tension face 50 & 70 The over-reinforced and under-reinforced
Sivasubramanian [60] (Under-reinforced 1300 ECC strengthened beams showed enhanced
and over- load carrying capacity of 5.71 to 8.45 and
reinforced) 5.37 to 8.31 times than control beam.
8. Yun [66] No reinforcement 100 × 100× tensile zone 30 & 50 The peak deflection of strengthened beam
400 enhanced 17.6% and 18.6% for ECC layer of
30 and 50mm, respectively than plain beam.
9. Zheng et al. [70] i) Steel 300 × 200× tensile zone 30 The cracking, yielding and ultimate loads of
ii) BFRP grid 1800 FRP-ECC strengthened beams are higher
than RC beams.
10. Krishnaraja and Steel reinforcement 100 × 150 × tension face 60 The ultimate load carrying capacity was
Kandasamy [64] 2000 found to be 1.13 times higher for PVA with
0.65% volume fraction and Steel with 1.35%
volume fraction.
11. Guan et al. [71] Fiber mesh 15 × 50 × 350 Soffit 20 The load carrying capacity and mid-span
reinforcement in deflection was enhanced by 50% and 70%
the middle. for bonded beams.
12. Ge et al. [62] Steel & BFRP 150 × 200 × tensile zone * r =0, 0.29, There is an increase in cracking, yielding and
h
1500 0.57 or 1.14. ultimate moments and decrease in deflection
of hybrid and ECC composites beams when
compared to conventional beams.
13. Ge et al. [72] FRP, steel 150 × 200 × tensile zone * r =0, 0.29, Replacement of ECC in tension zone
h
and hybrid 1500 0.57 or 1.14. improves the flexural behavior of FRP
reinforcement reinforced beams.
14. Kamal et al. [69] Steel reinforcement 150 x 200 × bottom side 30, 50 & 70 Tensile failure was observed for ECC layer
1800 with smaller thickness (30 & 50 mm) whereas
for larger thickness (70 mm) localization of
fracture occurred.

The IndIan ConCreTe Journal | June 2020 15