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Use of Recycled Concrete as Aggregates for the Construction of Fish Reefs

As a result of the Chi-Chi earthquake, which occurred in middle Taiwan on September 21, 1999, numerous buildings and bridges were seriously damaged. How to reuse a huge amount of building debris collected from the damaged structures became an important issue. After being crushed and screened, this debris could be served as recycled aggregate in concrete. Such recycled concrete is recommended to be used for sub-structures or other applications. Therefore, the production of fish reefs became one of the possibilities. In the study, treatment and measurement of the basic properties of the recycled aggregates were first studied. Then the manufacture of fish reefs with the recycled concrete were undertaken. Test results show that the properties of recycled aggregate can meet the requirements of natural aggregate. The fish reefs produced by using the recycled concrete were satisfactory and conformed to the demands of the Fisheries Administration in Taiwan.