EFFECT OF ACCELERATED CORROSION OF TENSION REINFORCEMENT ON BENDING BEHAVIOR OF REINFORCED CONCRETE BEAMS

Fathel Hassan, Qays

	EFFECT OF ACCELERATED CORROSION OF TENSION REINFORCEMENT ON BENDING BEHAVIOR OF REINFORCED CONCRETE BEAMS
AL-TAQANI
Article 1, Volume 26, Issue 5, 2013, Pages 0-0
Author
Qays Fathel Hassan
Abstract
This study comprises an experimental program to cast and test twelve reinforced concrete beams, of three different mix proportions, to know the effect of accelerated corrosion of bottom tension steel using electric corrosion cell on the bending behavior and ultimate capacity of the beams with variable corrosion degree and mix proportions. Corrosion degree (simple, moderate, and heavy) is assessed depending on theoretical weight loss of steel section using Faraday's Law through the period were the specimens leaved in corrosion cell. Crack pattern due to corrosion was the same for all beams and did not give an indication for the loss and variation in ultimate capacities, and these cracks developed in direction perpendicular to longitudinal reinforcement in approximately beam mid-span in a mean steel section loss by 3.1%. In spite of the high steel corrosion degree and the noticeable spalling of cover concrete, but the maximum crack width due to corrosion was less than 1 mm. Corrosion process caused decrease in ultimate capacities and mid-span deflections proportioned to corrosion degree, and the maximum loss in ultimate bending capacity was by 36% for beam R2D, and the maximum loss in mid-span deflection was by 54% for beam R1D. Concrete strain readings through beam depth also showed noticeable corrosion effect in increasing these strains and cracks, specially in tension zone.

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