Acceleration of the rate of the strength development for concrete mixes containing 30% replacement of portland cement by fly ash

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Proceedings titleCANMET/ACI International Conference on Recent Advances in Concrete Technology
ConferenceSixth CANMET/ACI International Conference on Recent Advances in Concrete Technology, June 8-11 2003, Bucharest, Romania
Pages115; # of pages: 15
Subjectaccelerator, cement, conduction calorimetry, fly ash, hydration, TGA, XRD; Concrete
AbstractThe merits of the use of fly ash in concrete mixes have been widely published. A replacement of cement > 20%, however, decreases productivity in construction. The use of an accelerating admixture to offset the delayed hydration resulting from the inclusion of fly ash levels >20 % in normal portland cement concrete mixtures is discussed. The objective of this investigation was to produce a concrete mixture with a significant amount (30%) of fly ash and yet developed early strength similar to 100% normal portland cement mixtures. The mechanism of the acceleration process of the fly ash/normal portland cement hydration will be discussed subsequently in a companion paper. Concrete mixtures with design strengths of 35 MPa containing a 30% replacement fly ash were accelerated to achieve 1 day-strength comparable to 100% normal portland cement. Mechanical properties such as compressive strength development were determined. The degree and rate of hydration were followed by X-ray diffraction, thermal analysis, and conduction calorimetry. It is shown that the addition of a new experimental accelerator in fly ash mixtures containing 30% fly ash replacement provided a compressive strength close to that obtained from a 100% normal portland cement mixture. The similarity of the hydrates formed in mortar mixtures containing the accelerator to mixtures containing 100% normal portland cement was also confirmed by X-ray diffraction and thermal analysis.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC numberNRC-IRC-15358
NPARC number20378624
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Record identifier108a2ee9-eeeb-401c-8833-89a1a39b7eec
Record created2012-07-24
Record modified2017-06-22
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