SURVEY ON DURABILITY OF CONCRETE USED FOR WAVE DISSIPATING BLOCK AND ISSUES FOR OVERSEAS APPLICATION

In Japan, wave-dissipating blocks with legs (with and without rebar) are often used for breakwaters. On the other hand, although there are few cases in foreign countries at present, there is also a possibility that the cases where similar wave dissipating blocks are used will increase in the future. When considering the applications for foreign countries, not only the mechanical properties of concrete used in blocks, but also information on the durability of concrete as shown below is required; 1) resistance to deterioration of concrete under marine environment, 2) Penetration resistance of chloride ion due to rebar corrosion. On the other hand, there is little quantitative information on durability of blocks in Japan. In order to understand the durability of the concrete used for the wave-dissipating block, the actual condition was surveyed on the block in Japan that has passed for a long time in marine environments. In addition, when designing and constructing harbor concrete structures in foreign countries, points to be considered when examining the durability of concrete are also organized.