EXPERIMENTAL STUDY ON REINFORCEMENT CORROSION-INDUCE COVER CRACKING TIME EMBEDED IN CONCRETE, MORTAR, AND CEMENT PASTE

Abstract

The objectives of this research were to evaluate the influence of compressive
strength, elastic modulus and corrosion rate on concrete cover cracking time
of steel reinforced concrete, mortar, and cement paste and to compare
concrete cover cracking times tested from experimental study with those
predicted from the existing models. The corrosion was accelerated by
applying the direct current between the reinforcement and the external
electrode and the time at cover cracking was monitored by strain gauges
attached around the specimens. As a result, the influences of elastic modulus
and compressive strength on the cover cracking time had the same trend. The
higher the strength and the modulus of elasticity was the longer the cover
cracking time. Comparing three types of materials, the cover cracking time
of cement paste specimen was the shortest followed by those of mortar and
concrete, respectively. It was found that the higher the corrosion rate was the
higher the reinforcement weight loss in the specimens. In addition, the results
calculated from the existing model were satisfied to predict the results from
the experiment.The objectives of this research were to evaluate the influence of compressive
strength, elastic modulus and corrosion rate on concrete cover cracking time
of steel reinforced concrete, mortar, and cement paste and to compare
concrete cover cracking times tested from experimental study with those
predicted from the existing models. The corrosion was accelerated by
applying the direct current between the reinforcement and the external
electrode and the time at cover cracking was monitored by strain gauges
attached around the specimens. As a result, the influences of elastic modulus
and compressive strength on the cover cracking time had the same trend. The
higher the strength and the modulus of elasticity was the longer the cover
cracking time. Comparing three types of materials, the cover cracking time
of cement paste specimen was the shortest followed by those of mortar and
concrete, respectively. It was found that the higher the corrosion rate was the
higher the reinforcement weight loss in the specimens. In addition, the results
calculated from the existing model were satisfied to predict the results from
the experiment.