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Effects of the temperature and relative humidity on the structure of CSH gel

✍ Scribed by Xiandong Cong; R.James Kirkpatrick

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
667 KB
Volume
25
Category
Article
ISSN
0008-8846

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✦ Synopsis

This paper describes the structural changes of C-S-H caused by curing at different relative humidities (R. II.) and temperatures using XRD, 2gSi NMR and thermal analysis. The results show that within the relative humidity range studied (9%-100%), the polymerization of C-S-H does not change, but that the local structure becomes more disordered with decreasing R. H. Heating of C-S-H results in increasing polymerization and structural disorder, and decreasing basal-spacing. It appears that decreasing relative humidity removes interlayer water molecules but that heating removes both water molecules and OH-groups. Thermal behaviors of jennite and 1.4-nm tobermorite are also studied and compared with those of C-S-H.

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