الفهرس 
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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 .