Journal
CEMENT AND CONCRETE RESEARCH
Volume 91, Issue -, Pages 1-12Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2016.10.004
Keywords
Pozzolan; Calcium-Silicate-Hydrate (C-S-H); Nanoindentation; EDX; Micromechanics
Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC) [RGPIN-2016-05985, 6636-438380-2013]
- National Council of Science and Technology, Mexico (CONACYT) [CVU:391250/256382]
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Although concrete sustainability can be remarkably improved by replacing high amounts of Portland cement clinker with suppleinentary cementitious materials (SCMs), this approach is far from being fully exploited. To compete with conventional concrete, a better understanding of low-cement concrete is needed regarding both microstructural features responsible for mechanical performance and key parameters for robust mix design. In particular, this paper aims at disclosing the microstructure of cementitious systems in which up to 60% of Portland cement has been replaced with natural pozzolan (NP), without significantly affecting the 90-day mechanical strength and stiffness (using a fixed water-to-binder ratio of 0.35). The study carries out coupled nanoindentation/energy-dispersive X-ray spectroscopy analyses, micromechanics modelling and image analysis to disclose the mechanical effects of NP on the overall stiffness and strength (i.e., the formation of a micro-granular skeleton of hard anhydrous inclusions and the transformation of Portlandite into calcium-aluminum-silicate-hydrate [C-A-S-H]). (C) 2016 Elsevier Ltd. All rights reserved.
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