Self-consolidating concretes incorporating high...
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Self-consolidating concretes incorporating high-volume natural pozzolan
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Goal of the research
To compare the effects of Portland cement replacement with natural pozzolan on the strength and durability of self-consolidating concretes
K. Celik, M. D. Jackson, M. Mancio, C. Meral, A. M. Emwas, P. K. Mehta, P. J. M. Monteiro, High-volume natural volcanic pozzolan and limestone powder as partial replacements for portland cement in self-compacting and sustainable concrete, Cement & Concrete Composites 45 (2014) 136–147.
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Pozzolan: optical microscopy
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Chemical composition of the materials
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Concrete Mix Proportions
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Compressive strength
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Durability tests
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Microstructural Studies
K. Celik, M. D. Jackson, M. Mancio, C. Meral, A. M. Emwas, P. K. Mehta, P. J. M. Monteiro, High-volume natural volcanic pozzolan and limestone powder as partial replacements for portland cement in self-compacting and sustainable concrete, Cement & Concrete Composites 45 (2014) 136–147.
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Microstructural Studies
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Summary
� Finely-ground natural basaltic ash pozzolan with or without finely-ground LS provides an effective high volume substitute for up to 50% by mass OPC in experimental concretes with good workability, which satisfy self-compacting concrete criteria without costly viscosity-modifying admixtures.
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Summary
� Cementitious hydrates in the interfacial zone along the rims of gel-palagonite particles have Ca/(Al + Si) = 0.4–0.6 and Na + Mg + K + Ti + Fe/(Al + Si) = 0.6–0.7, which reflect the lower calcium and higher alkali concentrations of the reacting basaltic glass relative to OPC.
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Summary
� The composition of C–A–S–H in the binding cementitious matrix vary from Ca/(Al + Si) = 0.70–1.9, which seem to reflect relative proximity to partially reacted gel-palagonite particles and the overall proportion of NP in the cement mix