The present research has the following conclusion from a manufacture of a test material based on a recyclable aggregate mixture(30%, 60%)-based steel fiber reinforcement for using the same as a bigger aggregate instead concrete and a material and structural characteristic which affects the Reinforced concrete.
1. As a result of a material-age based compressive strength, as the mixing amount of circular aggregate increases, a material-age based steel fiber non-reinforced test material is lower by 3.8~17.2%, and has a decrease of a steel fiber reinforced test material. As comparing the reinforcement of a steel fiber, the steel fiber-reinforced test material is lower by 8.4~9.3% as compared to the non-reinforced test material.
2. As a result of the material age-based tensile test, as the mixing amount of a recyclable aggregate increases, the material age-based steel fiber non-reinforced test material has a decrease of 5.0~18.4%, and the steel and fiber reinforcing test material has a decrease of 0.4~21.8%.
As comparing based on the steel fiber reinforcements, the steel fiber reinforced test material is higher by 3.0~11.1% with respect to the non-reinforced test material.
When a steel fiber are reinforced to the recyclable aggregate concrete based on a result of the compressive strength and a result of the tensile strength, the compressive and tensile strengths are significantly enhanced.
3. As a result of the bending test, as the mixing amount of the recyclable aggregate increases, the yield and maximum strengths are slightly decreased, but almost similar movements are shown.
In addition, as the recyclable aggregate increases, the smoothness coefficient decreases. The test material mixed with 30% of the recyclable aggregate mixed with steel fiber has a flexibility enhancement of 14.5%, and the test material mixed with 60% of recyclable aggregate is 25.3%.
4. As a result of various material tests and member tests, the steel fiber are reinforced with waste concrete classified as impurities with respect to common ground stones. Even when 60% of the mixing rate is adapted, it has compressive, tensile strengths and bending resistances similar with the concrete which uses common ground stones. So, it is judged that it may be adapted to an actual structure of a concrete bar made of waste concrete.
It is needed to further perform a research on other reinforcing materials and searing for enhancing a flexibility coefficient.