used aggregate 69

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    69 70 When material has satisfactory service record of at least five years, soundness requirement will be waived. Coarse aggregate grading shall conform to appropriate size designation of AASHTO M 43 when tested in accordance with AASHTO T 27. Grading and material finer than No. 200 (75 µm) sieve te sting shall be part of the Quality Control

  • Evaluation of Recycled Concrete for Use as Aggregate in ...

    RCA for natural coarse aggregate by up to 45% by volume had no significant effects on any of the properties. These results indicatethat high-quality RCA can be used as areplacement for a portion of the coarse natural aggregates in new portland cement concrete pavements in Washington State.


    The coarse aggregate used in concrete mix is of nominal size of 20 mm aggregates with aspecific gravity of 2.6. 4.4 Fly ash. Fly ash is a black finely divided residue resulting from the combustion of powdered coal and transported by the flue gases and collected by the electrostatic precipitator (Fig. 1(a)).

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    The ordinary Portland cement of 43 grade and natural fine aggregates (Haldwani sand) are used throughout the casting work. The maximum size of coarse aggregate used was 20 mm in both recycled and natural aggregate concrete.

  • Aggregates for Concrete - University of Memphis

    The importance of using the right type and quality of aggregates cannot be overemphasized. The fine and coarse aggregates generally occupy 60% to 75% of the concrete volume (70% to 85% by mass) and strongly influ- ence the concrete's freshly mixed and hardened proper- ties, mixture proportions, and economy. Fine aggregates (Fig.