Experimental Study on the Possibility of Using Permanently Recycled Concrete for Reinforced Concrete Structures
Reiji TANAKA, Seiji MIURA and Yoshiki OHAGA
Abstract:RC structures using the recycled aggregate concrete composed of recycled aggregate will evidently become concrete waste in due time. Such concrete waste has to be recycled as well in order to reduce concrete waste. In other words, the ideal goal is to use the recycled aggregate continuously. The purpose of this study is to determine whether the permanently recycled concrete is possible to use for reinforced concrete structures in terms of structural properties. For a structural property, aseismatic property was studied and discussed, taking into consideration the susceptibility of Japan to frequent earthquakes. The beam specimens of the flexural, shear and bond failure were tested on two types of concrete made of different concrete aggregate: recycled coarse aggregate made of original concrete, and mortar aggregate which was the final product of continually recycled concrete coarse aggregate. The test results showed that the beams using mortar aggregate concrete were equal in aseismatic property to normal concrete beams of the same concrete strength. From the above mention, it was verified that the permanently recycled concrete is possible to use for reinforced concrete structures. Key Words:Permanent recycling of concrete, Recycled coarse aggregate, Mortar aggregate, Flexural failure, Shear failure Bond failure, Aseismatic performance