High-volume natural volcanic pozzolan and limestone powder as partial replacements for portland cement in self-compacting and sustainable concrete

K. Celik, M. D. Jackson, M. Mancio, C. Meral, A. H. Emwas, P. K. Mehta, P. J.M. Monteiro

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish (US)
Pages (from-to)136-147
Number of pages12
JournalCement and Concrete Composites
Volume45
DOIs
StatePublished - 2014

Keywords

  • Basaltic ash pozzolan
  • Chloride migration
  • Compressive strength
  • Limestone filler
  • Petrographic analysis
  • Self-consolidating concrete

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)

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