The properties of inorganic recycled aggregate are similar to natural sand and gravel, a good alternative materials for land reclamation. Many developed countries, such as Japan, tried to reduce the usage amount of natural resources by using not only construction residual soil but also inorganic recycled aggregate for land reclamation. In this project, we inventories six harbor area of potential construction/development and reclamation capacity, including Taipei Port, Taichung Port, Kaohsiung Port, and Changhua Coastal Park. We estimate the total potential reclamation capacity up to 51.4 million tons, including a proximately usage amount of inorganic recycled aggregates reach to 51~77 million tons. To verify the suitability of incinerated recycled aggregate in port land reclamation, a long-term study of heavy metal leaching was conducted with the application of incinerated recycled aggregate immersed under different categories of water bodies. According to the heavy metal leaching results, no significant numerical variation or increasing was observed between samples and background, which samples of soil and water are collected from the port area filled with incinerated recycled aggregate within six years application. The incinerated recycled aggregated processed products were immersed under normal water and seawater for eight months, the results showed that no effect on sample compressive strength, and the heaving metal leaching value were not detected or below the quantifiable detection limit. According to the results, the incinerated recycled aggregate is deemed acceptable for application in land or port area reclamation. A total of 118.61 tons of incinerated recycled aggregate are filled in the windbreak area of Taichung Port, in August, 18, 2023. A detailed monitoring and analyzed of soil, groundwater, seawater and sediment samples were conducted before and after the land reclamation. The environmental monitoring and analyzed for Taipei harbor and Taichung harbor were conducted seven times (up to the 17th month) and once (up to the 2nd month) respectively after the completion of land reclamation. The results showed that heavy metals leaching (including of cadmium, lead, arsenic, mercury, chromium, copper, nickel, zinc) and dioxins concentration from all samples were found to comply with their respective environmental standards. Moreover, the monitoring values after land reclamation showed no significant differences compared to the background values.

Inorganic recycled aggregate, Land reclamation, Field test