Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 225, Issue -, Pages 1170-1182Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2019.08.016
Keywords
Ground granulated blast-furnace slag; Pore structure; Mercury intrusion porosimetry; Surface fractal
Categories
Funding
- Technology Innovation Special Program of Hubei Province [2018AAA002]
- State Key Laboratory of Silicate Materials for Architectures (Wuhan University of Technology) [SYSJJ2019-08]
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y Ground granulated blast-furnace slag (GGBS) is a massively produced waste in iron-making process. In present work, the pore size range of GGBS blended cementing composites is finely segmented to reveal the scale-dependent fractal nature of pore surface. Results indicate that structural complexity and irregularity of C-S-H gels can be improved by GGBS. It is proved that an increase in the pore surface area helps to improve the complexity (fractal dimension, D-s) of the pore wall. Linear growth of D-s with specific surface area exists in almost all pore ranges, especially in mesopore ranges. Fractal dimension in gel pore range shows the highest value, while the value in pore range of 1-10 mu m is almost the lowest. The macro region above 1 mu m, which is an aggregation of hydrated packing grains, shows a permanent-existing fractal behavior. The capillary pores between 10 nm and 1 mu m exhibits drifting non-fractal behavior, from micron-scale to nano-scale with curing time. (C) 2019 Elsevier Ltd. All rights reserved.
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