Journal
CEMENT & CONCRETE COMPOSITES
Volume 62, Issue -, Pages 168-177Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2015.07.004
Keywords
PLC; Curing; CMU; CO2 uptake; Compressive strength; Microstructure
Funding
- Natural Science and Engineering Research Council (NSERC) of Canada
- Canadian Concrete Masonry Producers Association (CCMPA)
- Lafarge Canada
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The effect of carbonation curing on the mechanical properties and microstructure of concrete masonry units (CMU) with Portland limestone cement (PLC) as binder was examined. Slab samples, representing the web of a CMU, were initially cured at 25 degrees C and 50% relative humidity for durations up to 18 h. Carbonation was then carried out for 4 h in a chamber at a pressure of 0.1 MPa. Based on Portland limestone cement content, CO2 uptake of PLC concrete after 18 h of initial curing reached 18%. Carbonated and hydrated concretes showed comparable compressive strength at both early and late ages due to the 18-h initial curing. Carbonation reaction converted early hydration products to a crystalline microstructure and subsequent hydration transformed amorphous carbonates into more crystalline calcite. Portland limestone cement could replace Ordinary Portland Cement (OPC) in making equivalent CMUs which have shown similar carbon sequestration potential. (C) 2015 Elsevier Ltd. All rights reserved.
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