Evaluation and Prediction Method on Neutralization of Supplied Long-term Hydraulic Concrete Structure

Abstract

Velocity of neutralization is occupied by three factors; W/C ratio in mixture proportion, type of cement and supplied environmental condition. Hydraulic concrete structures are objective in this study. Influences of supplement condition to neutralization characteristics were evaluated. As a result, coefficient of neutralization velocity of concrete exposed to air is larger than that of concrete exposed to water. However, as for hydraulic concrete structure, mortar is disappeared and coarse aggregate is exposed from concrete surface in water during long-term supplement. It means that coefficient of neutralization velocity of concrete in water could be an apparent coefficient and actual coefficient was almost same with that of concrete in air. On the other hand, coefficient of neutralization velocity of concrete canal was smaller than that of general engineering structures. Furthermore, neutralization depth and velocity of concrete canal was different even in same member. Therefore, it seems reasonable to conclude that evaluation of neutralization should be careful when concrete in water is measured.