A Study on the Properties of Fresh and Hardened Concrete Mixed Normal and Recycled Aggregate
Shinichi TAKAMI, Hideyuki KUMAMOTO and Shinzo NISHIBAYASHI
Abstract:Recycled aggregates, may give an important contribution towards decreasing the negative consequences that production and dumping of constructions and demolition waste nowadays impose on the environment. This paper describes an experimental investigation on the properties of fresh and hard of recycled concrete mixing normal aggregates with recycled ones. The results of the investigation are as follows: The recycled concrete owns almost same characteristics of consistency and entrained air as normal concrete. The mixture of recycled aggregates negatively affects the performance of fresh concrete. Meanwhile, the decrease of strength and elastic modulus in the hardened concrete is slightly small due to the increase of replacement of recycled coarse aggregates. Also in the using of large amount of recycled aggregate, it causes the deduction of durability, and the increase of drying shrinkage and carbonation. Key Words:Recycled aggregate, Mixed concrete of normal and recycled concrete, Fresh and hardened property, Durability