Investigation of usability of certain age and class of recycling aggregates in concrete

The demand for recycled building materials has increased in recent years. Particular, concrete waste, recycling has become widely used as aggregate, and many studies have been done on this subject. In this study, a certain age and class of coarse and fine aggregate from waste concrete as recycled aggregate concrete, use a sub-class is investigated. In this study, coarse recycled concrete aggregate was used in the ratio of 0, 10, 20, 30, 40, 50%; fine recycled concrete aggregate was used in the ratio of 0, 10, 20, 30, 40, 50%; both the coarse and fine recycled concrete aggregate was used in the ratio of 0, 10, 20, 30, 40, 50 %and 100 % respectively in place of crushed sand. Compressive stress, unit weight, moduls of elasticity and water absorption rates tests were determined for these concrete samples for 28 and 90 days. According to the test results, it was found that recycled aggregate could be used in concrete.Key Word : Concrete waste, coarse and fine recycled concrete aggregate, compressive strength, modulus of elasticity.