Influence of transportation and pumping on the properties of concrete with large amount of copper slag fine aggregate in actual construction of port and harbor structures

Copper slag fine aggregate (CUS) is 30% denser than normal aggregate is an effective material for port and harbor structures demanding high-density concrete is suggested from authors’ research. This study investigated influence of transportation and pumping on the properties of concrete with a large amount of CUS for application in the actual construction of port and harbor structures. In particular, the following results were obtained in this study. In the case of W / C = 0.5 concrete and partial replacement of fine aggregate with CUS in concrete, workability was not changed by transportation and pumping—it was generally equivalent to that of concrete with normal fine aggregate. The mechanical properties and chloride resistivity of hardened concrete were also equivalent to those of the referenced concrete. In the case of W / C = 0.6 and absolute replacement of fine aggregate with CUS in concrete, the slump value increased owing to an increase in entrapped air with the time passage of transportation. The amount of bleeding also decreased after a certain time of transportation, similar to normal concrete. Therefore, a satisfactory compaction is necessary for the exhaust entrapped air to achieve the designed unit volume weight. Moreover, hardened concrete achieved equivalent mechanical properties and chloride resistivity to normal concrete.