الفهرس | Only 14 pages are availabe for public view |
Abstract Used tires are one of the serious pollutants of the environment due to the increasing of accumulative volume annually. To reduce its negative impact on the environment, researchers have conducted several studies in the past two decades to recycle and reuse the tire waste in various fields, including in the construction industry, to evaluate its impact on the properties of concrete. On the other hand, concrete as being the most widely used composite material around the world, its capacity for implementing the use of by-product and waste material is high. The research studies the implementation of tire waste (micro rubber ash MRA) into the self-compacted concrete(SCC) as addition by the weight of total fine materials (cement + silica fume + fly ash) and evaluate its impact on the properties of fresh and hardened SCC. The study consists of control mix of SCC with a constant cement weight of 450 Kg/m³ for all mixtures and 15% of Class F fly ash and 15 % of SF were used as addition by weight of cement. One group of SCC was designed containing five different levels of MRA with size ranging (12%-45%) at 5%, 10%, 15%, 20% and 25% as addition by the weight of total fine materials (cement + silica fume + fly ash). Coarse aggregate was used with a maximum size (10) mm to achieve good flowability and resistance of segregation and Viscocrete 3425 was added to keep the slump flow constant for all mixes. Concrete mixes were investigated experimentally the tests of slump flow, slump flow time at T 50cm, V-funnel, L-box, J-rang, and GTM screen stability for SCC in the fresh state. The values of test results were within acceptable limits when using MRA up to 20% by weight of total fine materials according to the requirements of FNARC (2005) for self-compacted concrete. Also, the . |