Required Expansion Performance of Repair Material for Crack in Concrete Canal

Abstract

The crack width fluctuations in an irrigation canal are investigated to clarify the required expansion performance of repair materials. It was observed that the width of cracks in long and thin concrete walls fluctuated daily by short-term temperature change. It was shown that the daily fluctuation ratio was about 37.8% and yearly fluctuation ratio was 68.6%. Therefore the daily and yearly fluctuations in crack width must be considered in evaluation, diagnosis and repair for influences of cracks to the structure. An estimating equation for daily crack width fluctuation that took the temperature history into consideration was proposed and evaluated.