early_age2 - Properties of Fresh Concrete Early Ages...

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Properties of Fresh Concrete
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Early Ages P.K. Mehta and P.J.M. Monteiro, Concrete: Microstructure, Properties, and Materials Significance ± The first 48 hours are very important for the performance of the concrete structure. It controls the long-term behavior, influence fc, Ec, creep, and durability.
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Early Ages P.K. Mehta and P.J.M. Monteiro, Concrete: Microstructure, Properties, and Materials Properties at Early Ages ± Workability ± Slump Loss ± Segregation/Bleeding ± Plastic Shrinkage ± Time of Set ± Temperature
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Early Ages P.K. Mehta and P.J.M. Monteiro, Concrete: Microstructure, Properties, and Materials Workability ± Definition: Effort required to manipulate a concrete mixture with a minimum of segregation. ± It is not a fundamental property of concrete ± f(conditions, equipment, type of concrete, mix). ± e.g., dry mix --> poor workability if pumped, but good workability when placed in a conveyor belt (mass concrete)
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Early Ages P.K. Mehta and P.J.M. Monteiro, Concrete: Microstructure, Properties, and Materials Importance ± If concrete is very dry, it cannot consolidate well and will end up with lots of voids. w/c fc lab field Labor costs are high when using dry mixes
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Early Ages P.K. Mehta and P.J.M. Monteiro, Concrete: Microstructure, Properties, and Materials Workability ± consistency (slump) --> how easy to flow and ± cohesiveness --> tendency to bleed and segregate.
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Early Ages P.K. Mehta and P.J.M. Monteiro, Concrete: Microstructure, Properties, and Materials Consistency Tests ± Slump test
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Early Ages P.K. Mehta and P.J.M. Monteiro, Concrete: Microstructure, Properties, and Materials Slump test
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early_age2 - Properties of Fresh Concrete Early Ages...

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