Spatial zonation of a hydrotalcite-like phase in the inner product of slag: New insights into the hydration mechanism

Journal Article · Thu Jul 15 04:00:00 EDT 2021 · Cement and Concrete Research

DOI:https://doi.org/10.1016/J.CEMCONRES.2021.106460· OSTI ID:23206274

Li, Bo; Li, Qiu ^[1]; Chen, Wei ^[1]

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1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan (China)

The nano-structural evolution of the inner product of ground granulated blast furnace slag in blended cement at 7, 14, 28 56 and 180d was revealed. Three distinct layered inner hydration product region were observed because of the spatial zonation of hydrotalcite-like phase, C-A-S-H gel and Ca-Al LDH phase. The zonation of inner hydration product explains the presence of the multi-rims features of the slag grains with a relatively high reaction degree at very late ages. Diffusion of dissolved ion from slag grains and the effect of pore space on the reorganization of hydration products play a key role in forming the spatial zonation of inner hydration product. The findings of the zonation of inner region argue that the lack of pore space in the inner region makes the continued dissolution of slag hard to complete.

• OSTI ID: 23206274
• Journal Information: Cement and Concrete Research, Journal Name: Cement and Concrete Research Vol. 145; ISSN 0008-8846; ISSN CCNRAI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CEMENTS
DIFFUSION
DISSOLUTION
GELS
HYDRATION
ION BEAMS
IONS
SLAGS