Recycling

Biography

Biography: Hasan Baylavli

Abstract

In this study, re-use of recycle aggregates obtained from polypropylene fiber-reinforced welded concretes in concrete is researched. Eight kinds of polypropylene fibers were used in the study. Polypropylene fibers were used within the admixture at three different rates. The amount of cement in the admixture is 300 kg/m3. Water-cement rate is 0.52. Cylinder samples in 150 mm diameter and 300 mm height were used for the tests. Samples were crushed in jaw crusher at the end of 120 days. Fibrous recycle aggregates in the size of 0-4 mm, 7-15 mm and 16-22.4 mm were acquired in the end of crushing. A new concrete admixture was acquired by using fiber-reinforced recycle aggregates. Recycle aggregates at the sizes of 7-15 mm and 16-22.4 mm were added to new admixture. 0-4 mm natural sand was used as fine aggregate. The fine obtained from recycle was not used in the new admixture. It was observed in the pretests carried out that recycle fine sand increase the amount of water and cement in the admixture. The amount of cement in new admixture is 350 kg/m3. Water-cement rate is 0.56. Cubic samples were prepared from new admixture in the size of 70x70x115 mm. Upward wear and water absorption tests were conducted on the samples at the end of 28 days. Welded concrete was compared with abrasion and water absorption values. Abrasion and water-absorption values have increased compared to welded concrete.