Journal
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
Volume 29, Issue 3, Pages 504-506Publisher
JOURNAL WUHAN UNIV TECHNOLOGY
DOI: 10.1007/s11595-014-0948-x
Keywords
C-S-H; morphology; structure; polyacrylamide; polyvinyl alcohol
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Funding
- National Natural Science Foundation of China [51072150, 51272193]
- Program for New Century Excellent Talents in University [NCET-10-0660]
- Fundamental Research Funds for the Central Universities [2012-Ia-010, 2013-Ia-015]
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The effects of polyacrylamide (PAM) and polyvinyl alcohol (PVA) on morphology and structure of calcium silicate hydrate with C/S 1.0-1.7 prepared via precipitation in solution were investigated by XRD, FT-IR and TEM techniques. The results show that incorporation of the polymers decreased the order degree, increased the interlayer spacing and disturbed the layered stacking of C-S-H. Interlayer spacing expansion depended on C/S ratios and type of polymer. Interlayer spacing expansion had a minimum at C/S 1.0 and a maximum at C/S 1.3 and 1.5. lnterlayer spacing expansion of PAM was bigger than that of PVA with the same C/S. C-S-H added with PVA mainly exhibited foil-like and fibrillar morphology. The fibrils were of variable length from a few tens of nanometers to a few hundreds of nanometers. Fibrils or foils seemed to be Longer in the presence of PVA.
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