الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Self-Compacting Concrete is an innovative concrete that does not require
vibration for placing and compaction. It is able to flow under its own weight,
completely filling formwork and achieving full compaction, even in the
presence of congested reinforcement. One of the disadvantages of selfcompacting
concrete is its cost, associated with the use of high volumes of
Portland cement and use of chemical admixtures. One alternative to reduce
the cost of self-compacting concrete is the use of mineral admixtures such as
silica fume, fly ash and limestone powder as a cement replacement materials.
When these mineral admixtures replace a part of the Portland cement, the
cost of self- compacting concrete will be reduced especially if the mineral
admixtures are waste or industrial by-product.
This study presents the development of SCCs produced with binary, ternary
and multi-systems of Portland cement, Fly Ash (FA), Silica Fume (SF) and
limestone powder (LP) as a partial cement replacement material (CRMs)
with different percentages and using local materials and investigate the fresh
and hardened, fluid transport characteristics and microstructure of such
concrete.
Five series of concrete mixes containing binary, ternary and multi-system
blends were designed and cast with a constant water/binder ratio of 0.35 and
performance is measured and compared with control mix of Portland cement.
Test results showed that SCC can be produced with binary, ternary and multisystems
of Portland cement, Silica Fume (SF), Fly Ash (FA) and limestone
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powder (LP) as a partial cement replacement material (CRMs) with different
percentages having satisfactory performance in the fresh state with
compressive strength ranging from (37.5 – 90) Mpa at 90 days. The inclusion
of (SF) and/or (FA) reduce the amount of superplasticizer necessary to
achieve a given fluidity. But the inclusion of (LP) increase the amount of
superplasticizer needed. However, the inclusion of (LP) in SCC mixes
increases the segregation resistance.
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