NDLI: Chemical composition and microstructure of hydration products of hardened white portland cement pastes containing admixtures

Content Provider	Springer Nature Link
Author	Li, Qiu
Copyright Year	2015
Abstract	This study investigated the nature of hydration products of white portland cement (WPC) containing 20 mM malic acid or 1 M calcium chloride hydrated for 11 years. The study identified the hydration products and characterized the chemical composition, morphology, micro/nano structure of C-S-H and the main binding phase in cementitious materials. Calcium hydroxide (CH), ettringite and C-S-H were identified in WPC with 20 mM malic acid paste hydrated for 11 years. WPC with 1 M calcium chloride paste hydrated for 11 years contained the same phases, but with less CH, and the presence of Friedel’s salt (Ca$_{2}$Al(OH)$_{6}$Cl·2H$_{2}$O). There were still small amount of anhydrous cement particles remaining in both pastes after 11 years hydration according to the SEM and $^{29}$Si MAS NMR results. The hydration products of paste containing malic acid had a lower porosity than those prepared with calcium chloride upon visual inspection under SEM. The morphology of the outer product (Op) C-S-H was coarse fibrillar and the inner product (Ip) C-S-H had a very fine microstructure in both pastes under TEM. Both Ip and Op C-S-H formed in paste containing malic acid had lower Ca/Si and higher Al/Si than those in paste containing calcium chloride. C-S-H in paste containing calcium chloride had longer MCL and less percentage of bridging tetrahedra occupied by aluminum in silicon/aluminum chains due to relatively less Q $^{1}$ and more Q $^{2}$. A new type of silicon tetrahedra, Q $^{2B}$, was introduced during deconvolution of $^{29}$Si MAS NMR results. Ip and Op C-S-H in both pastes had aluminum substituted tobermorite-type and jennite-type structure, and all the charges caused by aluminum substituting silicon bridging tetrahedra were balanced by Ca$^{2+}$.
Starting Page	758
Ending Page	767
Page Count	10
File Format	PDF
ISSN	10002413
Journal	Journal of Wuhan University of Technology-Mater. Sci. Ed.
Volume Number	30
Issue Number	4
e-ISSN	19930437
Language	English
Publisher	Wuhan University of Technology
Publisher Date	2015-07-30
Publisher Place	Wuhan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	calcium chloride malic acid calcium-silicate-hydrate (C-S-H) TEM NMR Materials Science
Content Type	Text
Resource Type	Article
Subject	Materials Science

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