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" High-volume natural volcanic pozzolan and limestone powder as partial replacements for portland cement in self-compacting and sustainable concrete "
Celik, K.Jackson, M.D.Mancio, M.Meral, C.Emwas, A.-H.Mehta, P.K.Monteiro, P.J.M.
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AL
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| Record Number
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901970
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LA6mq3j474
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| Title & Author
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High-volume natural volcanic pozzolan and limestone powder as partial replacements for portland cement in self-compacting and sustainable concrete [Article]\ Celik, K.Jackson, M.D.Mancio, M.Meral, C.Emwas, A.-H.Mehta, P.K.Monteiro, P.J.M.
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2014
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| Title of Periodical
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UC Berkeley
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| Abstract
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A laboratory study demonstrates that high volume, 45% by mass replacement of portland cement (OPC) with 30% finely-ground basaltic ash from Saudi Arabia (NP) and 15% limestone powder (LS) produces concrete with good workability, high 28-day compressive strength (39 MPa), excellent one year strength (57 MPa), and very high resistance to chloride penetration. Conventional OPC is produced by intergrinding 95% portland clinker and 5% gypsum, and its clinker factor (CF) thus equals 0.95. With 30% NP and 15% LS portland clinker replacement, the CF of the blended ternary PC equals 0.52 so that 48% CO2 emissions could be avoided, while enhancing strength development and durability in the resulting self-compacting concrete (SCC). Petrographic and scanning electron microscopy (SEM) investigations of the crushed NP and finely-ground NP in the concretes provide new insights into the heterogeneous fine-scale cementitious hydration products associated with basaltic ash-portland cement reactions.
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