EFFECT OF CEMENT ALTERNATIVES ON THE MECHANICAL PROPERTIES OF SELF-COMPACTING CONCRETE USING VARIABLE AGGREGATE TYPES

Hamdy A-k Shehab, Mohamed A. Almetwally, Salah E. Abd El-mageed, Mohamed R. A. Emara

Abstract


Self-compacting Concrete (SCC) is a new category of High Performance Concrete with high workability and flowability but without segregation. This concrete has the advantages of being compacted easily under its own weight without the need of any external compacting energy. The current research studied the properties of SCC containing different powder types (fly ash, silica fume and metakaoline) and different aggregate types (gravel, basalt and dolomite) compared with that of SCC without any powders. A trial mixes were done to obtain the water/powder ratio and the amount of super-plasticizer to ensure the self compactability conditions. Fresh properties of SCC were tested and the results indicated that all mixes satisfied the allowable ranges for slump flow time (T50), slump flow diameter (D), and V-Funnel flow time. Also the hardened properties of SCC were tested and the results indicated that mixes containing dolomite as a coarse aggregate gives the highest values for both compressive and tensile strength. On the other hand mixes containing gravel as a coarse aggregate gave the lowest values. Also, the results indicated that incorporating powders (FA, SF, and MK) as a partial replacement of cement has a little increase in the compressive strength after 3 days than that of the control mixes at a certain percentages, and gives a marked increase in the values of the compressive strength after 28 days, but this incorporation has a little effect on tensile strength

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