EXPANSION AND CONTRACTION PROPERTIES OF SLAB AND WALL FENCES USING OF EXPANSIVE CONCRETE IN FULL SCALE ROAD BRIDGE SPECIMENS

Abstract

 Expansive concrete has been utilized to suppress cracks of concrete for a longer time particularly for the symmetrical cross-sectional dimensions structures by using chemical prestress technology of that is introduced by the expansive additive. In order to widen the application of this technology to various concrete structures, estimating method of chemical prestress in the unsymmetrical cross-sectional dimensions concrete was proposed and was evaluated on a full-scale road bridge specimen using expansive concrete slab and wall fences. As a result, it was clarified that the chemical prestress introduced unsymmetrical crosssectional dimensions can be evaluated by the proposed estimation method. In addition, it was observed that the shrinkage cracks on the wall fences were suppressed by the chemical prestress.