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Micro-structural development of gap-graded blended cement pastes containing a high amount of supplementary cementitious materials
Abstract To clarify the strength improvement mechanism of gap-graded blended cements with a high amount of supplementary cementitious materials, phase composition of hardened gap-graded blended cement pastes was quantified, and compared with those of Portland cement paste and reference blended cement (prepared by co-grinding) paste. The results show that the gap-graded blended cement pastes containing only 25% cement clinker by mass have comparable amount of gel products and porosity with Portland cement paste at all tested ages. For gap-graded blended cement pastes, about 40% of the total gel products can be attributed to the hydration of fine blast furnace slag, and the main un-hydrated component is coarse fly ash, corresponding to un-hydrated cement clinker in Portland cement paste. Further, pore size refinement is much more pronounced in gap-graded blended cement pastes, attributing to high initial packing density of cement paste (grain size refinement) and significant hydration of BFS.
Micro-structural development of gap-graded blended cement pastes containing a high amount of supplementary cementitious materials
Abstract To clarify the strength improvement mechanism of gap-graded blended cements with a high amount of supplementary cementitious materials, phase composition of hardened gap-graded blended cement pastes was quantified, and compared with those of Portland cement paste and reference blended cement (prepared by co-grinding) paste. The results show that the gap-graded blended cement pastes containing only 25% cement clinker by mass have comparable amount of gel products and porosity with Portland cement paste at all tested ages. For gap-graded blended cement pastes, about 40% of the total gel products can be attributed to the hydration of fine blast furnace slag, and the main un-hydrated component is coarse fly ash, corresponding to un-hydrated cement clinker in Portland cement paste. Further, pore size refinement is much more pronounced in gap-graded blended cement pastes, attributing to high initial packing density of cement paste (grain size refinement) and significant hydration of BFS.
Micro-structural development of gap-graded blended cement pastes containing a high amount of supplementary cementitious materials
Zhang, Tongsheng (author) / Yu, Qijun (author) / Wei, Jiangxiong (author) / Gao, Peng (author) / Chen, Peixin (author) / Hu, Jie (author)
Cement and Concrete Composites ; 34 ; 1024-1032
2012-06-16
9 pages
Article (Journal)
Electronic Resource
English
| British Library Online Contents | 2014