| Download | - View final version: Acceleration of the rate of the strength development for concrete mixes containing 30% replacement of portland cement by fly ash (PDF, 596 KiB)
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| Author | Search for: Raki, L.1; Search for: Chen, M.; Search for: Mailvaganam, N. P.1 |
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| Affiliation | - National Research Council of Canada. NRC Institute for Research in Construction
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| Format | Text, Article |
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| Conference | Sixth CANMET/ACI International Conference on Recent Advances in Concrete Technology, June 8-11 2003, Bucharest, Romania |
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| Subject | accelerator, cement, conduction calorimetry, fly ash, hydration, TGA, XRD; Concrete |
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| Abstract | The 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. |
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| Publication date | 2003-06-01 |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| Identifier | NRC-IRC-46262 |
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| NRC number | NRC-IRC-15358 |
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| NPARC number | 20378624 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 108a2ee9-eeeb-401c-8833-89a1a39b7eec |
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| Record created | 2012-07-24 |
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| Record modified | 2021-12-07 |
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