Journal
CEMENT AND CONCRETE RESEARCH
Volume 40, Issue 12, Pages 1673-1680Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2010.08.007
Keywords
A. morphology; A. mechanism; A. drying; A. humidity; B. calcium silicate hydrate (C-S-H); B. microstructure; B. scanning electron microscopy (SEM)
Funding
- National Science Foundation [CMS 0409571]
- NSF-Nanoscale Science and Engineering Center (NSEC)
- NSF-Materials Research Science and Engineering Centers (MRSEC)
- Keck Foundation
- State of Illinois
- Northwestern University
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The morphology of early-age C-S-H, often referred to as outer product or low-density C-S-H, is generally accepted to be fibrillar and forms mainly during the early stages of hydration. This paper reports the effect of drying on the microstructure in young tricalcium silicate paste, which provides insight into the mechanism that leads to the fibrillar morphology. During the first few days after C(3)S is mixed with water, the morphology of C-S-H is more affected by drying rate than by relative humidity. This sensitivity is most apparent at partial pressures greater than 85%. During this time, the fibrillar C-S-H product can be suppressed by drying C(3)S paste samples very slowly prior to imaging. This approach is interpreted as evidence that this fibrillar morphology, which naturally form over time, grow as tiny colloidal particles that rearrange during the early stages of hydration, leading to well-established larger scale morphologies. (C) 2010 Elsevier Ltd. All rights reserved.
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