الفهرس 
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Abstract
The objective of this study is to evaluate the effect of Marble and Granite sludge wastes on the fresh and hardened properties of conventional & self-compacting concrete (SCC). For this purpose, several representative samples of marble and granite sludge were collected from different ornamental stone industry plants and were characterized from chemical, physical, and mineralogical points of views. The materials used in the present study include marble and granite sludge, cement binder, fine and coarse aggregates, admixtures, additives, and mixing water. Various tests were applied to these materials for characterization purposes using different standard test methods while the used filler material was 10%, 20%, 30%, and 40%. Slump and slump - Flow, T50, V-Funnel, L-Box, U-Box, and J-Ring was performed on the fresh concretes. The studied hardened properties included unit weight; voids ratio, porosity, and water absorption beside flexural, tensile, and compressive strengths were performed.
The results of the current study demonstrated that:
I. The addition of marble and granite wastes as a cement replacement in blended cement pastes led to an insignificant increase in normal consistency (workability), while a reduction in initial and final setting times.
II. The slump values for all conventional concrete mixtures incorporating marble and granite sludge wastes comply with limits of the designed slump except for substitution levels 30% and 40 %.
III. The addition up to 20% of both marble and granite sludge revealed a slight decline in the physical, durability, and mechanical properties of the conventional concrete mixtures comparing to the control mixture. Regarding durability properties, all substitution percentages showed a good resistance toward the acid attack in terms of weight and strength loss more than the control mixture. Moreover, the marble and granite addition showed an enhancement in water penetration more than the control.
IV. All SCC mixtures encompassing marble and granite sludge wastes as cement replacement comply with the specifications of fresh properties of SCC according to (EFNARC, 2002) with an insignificant change comparing to the control one.
V. Regarding the physical and mechanical properties, the SCC mixtures incorporating marble and granite sludge revealed a slight decline up to 20% addition compared to the control mixture.
VI. Concerning the durability properties, all marble and granite sludge percentages showed a good resistance toward the acid attack in terms of weight and strength loss more than the control mixture.