TY - JOUR
T1 - Performance of corroded reinforced-concrete beams in flexure strengthened using different basalt fiber textile-reinforced mortar schemes
AU - Oluwadahunsi, Silas
AU - Moy, Charles K.S.
N1 - Publisher Copyright:
© 2020 American Society of Civil Engineers.
PY - 2020/12/1
Y1 - 2020/12/1
N2 - The need for an effective method for the restoration of corrosion-damaged reinforced-concrete elements cannot be overemphasized. In this investigation, the use of textile-reinforced mortar (TRM) for external strengthening of corroded reinforced-concrete beams in flexure is examined. The degrees of corrosion considered were 10% and 20% mass losses of the tension steel at midspan. Sixteen beams were tested in four-point bending; eight beams were cast using normal grade 35 concrete and eight beams were cast with a special high-strength concrete with steel fibers. Three strengthening schemes of a single-ply basalt TRM, covering an equal area on individual beam surfaces, were employed. As expected, the corrosion had a detrimental effect on load-carrying capacity, ductility, energy absorption, and flexural stiffness of RC beams. The strengthening schemes increased the load capacity of the 10% corroded beams within a range of 7.5%-26%, thereby yielding a restoration ranging from 105% to 112% of the peak load capacity. Full recovery of load capacities was not achieved for the 20% corroded beams. The ultimate failure mode observed in all strengthened specimens was fiber rupture, indicating full utilization of composite action of basalt TRM. A U-wrap scheme gave the best load-displacement response and energy absorption recovery.
AB - The need for an effective method for the restoration of corrosion-damaged reinforced-concrete elements cannot be overemphasized. In this investigation, the use of textile-reinforced mortar (TRM) for external strengthening of corroded reinforced-concrete beams in flexure is examined. The degrees of corrosion considered were 10% and 20% mass losses of the tension steel at midspan. Sixteen beams were tested in four-point bending; eight beams were cast using normal grade 35 concrete and eight beams were cast with a special high-strength concrete with steel fibers. Three strengthening schemes of a single-ply basalt TRM, covering an equal area on individual beam surfaces, were employed. As expected, the corrosion had a detrimental effect on load-carrying capacity, ductility, energy absorption, and flexural stiffness of RC beams. The strengthening schemes increased the load capacity of the 10% corroded beams within a range of 7.5%-26%, thereby yielding a restoration ranging from 105% to 112% of the peak load capacity. Full recovery of load capacities was not achieved for the 20% corroded beams. The ultimate failure mode observed in all strengthened specimens was fiber rupture, indicating full utilization of composite action of basalt TRM. A U-wrap scheme gave the best load-displacement response and energy absorption recovery.
KW - Basalt fiber
KW - Corrosion
KW - External strengthening
KW - Reinforced concrete (RC)
KW - Textile-reinforced mortar
UR - http://www.scopus.com/inward/record.url?scp=85090155820&partnerID=8YFLogxK
U2 - 10.1061/(ASCE)CC.1943-5614.0001075
DO - 10.1061/(ASCE)CC.1943-5614.0001075
M3 - Article
AN - SCOPUS:85090155820
SN - 1090-0268
VL - 24
JO - Journal of Composites for Construction
JF - Journal of Composites for Construction
IS - 6
M1 - 04020061
ER -