New And Old Concrete Bonding Surface Of Freeze-thaw Splitting Tensile Pilot Study

This paper is concerned with the adherence capability of the new-to-old concrete. With the action of freeze-thaw ,we tested and studied it by testing of splitting tensile .The main goal of this paper study several factors influence on the splitting tensile strength of adherence face of new on old concrete with freeze-thaw cycling. Following is the factors ideating with the surface of old concrete in different way(including brushing surface, chiseling surface,cleaving surface) , adherence agent (including cement slurry,cement sand slurry,cement slurry with the U expansion agent ), the freeze-thaw circulation times and air-entraining .As a result ,we found that the roughness influence on the adhesion capability of the new on old concrete to a large degree.The larger rougeness is , the larger the splitting tensile strength on the adhension face is.The kind of adhesion agent is also influence on the adherence capability of new on old concrete .The circulation times of freez-thaw have a large influence on the splitting tensile strength of adherence face of new on old concrete .The analysis of tests give some advices to the practical engineering.