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High-volume natural volcanic pozzolan and limestone powder as partial replacements for portland cement in self-compacting and sustainable concrete
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Date
2014-01-01
Author
Celik, K
Jackson, MD
Mancio, M
Akgül, Çağla
Emwas, A-H
Mehta, PK
Monteiro, PJM
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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.
Subject Keywords
General Materials Science
,
Building and Construction
URI
https://hdl.handle.net/11511/37244
Journal
CEMENT & CONCRETE COMPOSITES
DOI
https://doi.org/10.1016/j.cemconcomp.2013.09.003
Collections
Department of Civil Engineering, Article
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K. Celik et al., “High-volume natural volcanic pozzolan and limestone powder as partial replacements for portland cement in self-compacting and sustainable concrete,”
CEMENT & CONCRETE COMPOSITES
, pp. 136–147, 2014, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/37244.