Study on Shear Behavior of Concrete-polymer Cement Mortar at Elevated Temperature
Abstract: In this experimental
and analytical work, interfacial shear strengths were evaluated at material and
member level. Bi-surface shear strength was performed at material level and
three-point bending test was conducted at member level. Beams were strengthened
by adding steel reinforcement at soffit level and covered by spraying polymer
cement mortar (PCM). After curing, strengthened RC beams were exposed to 60 ℃ for 24 hours and tested in three point loading test. Flexural
capacity, load deflection relationship and failure modes were observed
and compared with the strengthened beams tested at 20 ℃. Reduction in flexural capacity was observed with temperature,
failure mode was also shifted from flexural mode to debonding mode of failure
at elevated temperature. Ultimate shear load and failure modes were
predicted by truss analogy approach. Debonding model was proposed by
incorporating bi-surface interfacial shear strength, close agreement were
observed between experimental and predicted values.
Keywords: Bi-Surface
interfacial shear strength; debonding model; failure modes; strengthened beams;
temperature
Author: Khuram Rashid, Tamon
Ueda, Dawei Zhang
Journal Code: jptsipilgg160074
