EXPERIMENTAL STUDY ON PREVENTION OF DETERIORATION OF BOND STRENGTH BETWEEN CONCRETE AND REINFORCING BARS IN SLURRY FOR THE CONSTRUCTION OF CAST-IN-PLACE CONCRETE PILE

Abstract

We wish to report on the results of various kinds of experiments on the slurry of cast-in-place concrete pile. These experiments were conducted to improve the bond strength between concrete and reinforcing bars in slurry. At first, we investigated the relationship between the density of slurry, current flowing time of slurry and quantity of bentonite attached to the surface of the reinforcing bar. As a result, it was found that this adhesion occurred due to an electro-chemical phenomena. This information helped us find the correct dispersion material, polycarboxylate-system high polymer compound.