NDLI: Effect of curing regime on polymerization of C-S-H in hardened cement pastes

Content Provider	Springer Nature Link
Author	Ding, Qingjun Hu, Chenguang Feng, Xiaoxin Huang, Xiulin
Copyright Year	2013
Abstract	The effect of two different curing regimes on the polymerization degree of C-S-H in hardened cement pastes within 28 d were investigated by measuring the chemical environments of $^{29}$Si with magic angle spinning (MAS) nuclear magnetic resonance (NMR) and by analyzing the $^{29}$Si NMR spectra with deconvolution technique. The experimental results indicate that, at curing regime of constant temperature of 20 °C, the polymerization of C-S-H increases and then decreases with curing age, and the Al/Si ratio increases gradually with curing age, furthermore, the two non-bridging oxygen bonds of bridging silicate tetrahedra in C-S-H structure mainly bond to H$^{+}$. At curing regime of variable temperature, the polymerization of C-S-H firstly increases then changes slightly and subsequently decreases with the temperature from low to high and then to low, and the Al/Si ratio firstly increases then keeps invariant and subsequently slightly decreases. Moreover, the temperature decreasing is advantageous for the Ca$^{2+}$ to be bonded to the bridging silicate tetrahedra and entering into the interlayer of C-S-H structure. The polymerization of C-S-H at curing regime of variable temperature is higher than that cured at constant temperature, but the curing regime of constant temperature is more beneficial to the substitution of Al$^{3}$ for Si$^{4+}$ than that of variable temperature.
Starting Page	715
Ending Page	720
Page Count	6
File Format	PDF
ISSN	10002413
Journal	Journal of Wuhan University of Technology-Mater. Sci. Ed.
Volume Number	28
Issue Number	4
e-ISSN	19930437
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-07-13
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	curing temperature cement C-S-H polymerization Al/Si ratio Materials Science
Content Type	Text
Resource Type	Article
Subject	Materials Science

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