Ilker Bekir TOPCU
Eskisehir Osmangazi University, Engineering and Architecture, Turkey
Title: Re-Use of Polypropylene Fiber Admixed Recycled Aggregates in Concrete
Biography
Biography: Ilker Bekir TOPCU
Abstract
This research analyses recycle of polypropylene fiber admixed concretes. Study aims to research reuse of fiber admixed recycled aggregates in concrete. In this research eight types of polypropylene fiber are used. Polypropylene fibers added to the mixture in three different ratios. The quantity of cement in the mixture is 300 kg/m3. Water-cement ratio is 0,52. For experiments, cylinder concrete molds with 150 mm diameter and 300 mm height were used. Samples were broken by jawbreaker at the end of 120 days. As a result of the break, recycled fiber aggregates were obtained with 0-4 mm, 7-15 mm and 16-22.4 mm sizes. Recycled aggregates’ specific weight and unit weight were calculated. Values of specific weight and unit weight were decreased. By using fiber-reinforced recycled aggregates a new concrete mixture was made. To the new mixture, recycled aggregates with sizes of 7-15 mm and 16-22.4 mm were added. As fine aggregate, 0-4 mm natural sand is used. Ratio of cement in the new mixture is 350 kg/m3 Ratio of water-cement is 0,56. Compression strength of the obtained concrete is analyzed for 28 days. Compression strengths of fiber admixture concrete and fiber admixture recycled aggregated concrete are compared. Compression strength is decreased by 22.59 % in some mixtures and increased by 11,14 % in some others. It is concluded that by changing water-cement ratio and quantity of chemical admixture, it is possible increase the compression strength. Therefore it is possible to use polypropylene fiber concretes in recycling.