Akademik Veri Yönetim Sistemi
JOURNAL OF POLYTECHNIC-POLITEKNIK DERGISI, cilt.21, sa.1, ss.83-91, 2018 (ESCI)
Nowadays concrete is the most commonly used construction material. Many researchers are investigating the use of recycled aggregate in concrete because 70-75% of concrete is composed of aggregates and using aggregates produced from waste concrete has environmental, ecologic and economic impacts and reduces the energy and natural resources consumption. In this study properties of aggregates provided from crushing waste concrete and also engineering properties of concrete made from these aggregates have been investigated. Fine and coarse recycled concrete aggregates (RCA) were replaced in the ratio of 0, 20, 40, 60, 80 and 100% with fine and coarse crushed aggregates in concrete mix design. CEM I 42,5 R cement was used as a binder and replaced by 20% of the cement's weight with fly ash in all mixtures. Due to the high water absorption of the RCA in comparison to the crushed aggregates, the slump was decreased by increasing RCA substitution ratio in the mixtures. Control concrete (CC) has gained the highest compressive strength in all ages. 28 and 90-day compressive strength of normally cured concretes, the bond strength between concrete specimens and rebars and compressive strength of concretes subjected to the wetting and drying cycles were decreased by increasing RCA substitution ratio in the mixtures.