Study on the hydration products of C3S prepared by sol–gel method
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Tricalcium silicate (C3S) mineral was prepared by sol–gel method, using tetraethyl orthosilicate as silicon source, Ca(NO3)2·4H2O as calcium source, EtOH as cosolvent and saltpeter solution as catalyst. The percentage of f-CaO of C3S is less than 0.18 %. C3S samples were hydrated with a w/b ratio 20 at room temperature. SEM results show calcium silicate hydrate (C–S–H) is a tightly coupled laminated structure within hydration 12 h and grew acicular fiber at later ages. The mean C/S ratios of C–S–H remain around 1.55 at 28 days. Calcium hydroxide (CH) occurs the directional growth toward the (001) crystal plane. XRD results show the width of CH diffraction peak got broadened with the increase in hydration ages and the crystallinity of C3S has dropped. Bound water in C–S–H at different ages of hydration supports the assumption that the hydration rate of C3S at early stage is much faster than that at late ages.
KeywordsHydration products C3S Sol–gel method C–S–H Directional growth
This work is supported by Science and Technology Development Plan of Shandong Province (2013GGB01156) and Natural Science Foundation of Shandong Province, China (ZR2015EM019). We also thank Program for Scientific Research Innovation Team in Colleges and Universities of Shandong Province.
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