2019 Volume 73 Issue 1 Pages 387-393
Japan produces oysters in each district, and Hiroshima Prefecture is especially famous as being a high producing district. The production of oysters has created oyster shells as a by-product. Oyster shell porous concrete （OyPoC） is the porous concrete using crushed oyster shells as aggregates for the effective utilization of resources. In this study, the test method for void ratio and the long-term plant-growing performance of OyPoC were investigated. The particle size of the oyster shell aggregate ranged from 0.3 to 5mm. From the test results, voids in OyPoC were saturated with water by vacuum deaeration more than 10minutes with wet specimens for calculation on the void ratio of OyPoC. It was found that OyPoC with high absorption aggregate became oven-dry condition by drying in the oven more than 3days. The long-term planting test results showed that OyPoC compacted with the jigging method had higher plant-growing performance than the vibrator method, which had the high compaction energy. However, the grass on OyPoC compacted with the jigging method withered if it was not supplied with sufficient water during hot and dry summer. The grass cover level suggested in this study could estimate the grass growing condition more correctly than the grass length.
