Micro-structural development of gap-graded blended cement pastes containing a high amount of supplementary cementitious materials
Micro-structural development of gap-graded blended cement pastes containing a high amount of supplementary cementitious materials
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DOI：
10.1016/j.cemconcomp.2012.06.010
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发表时间：
2012-10
影响因子：
10.5
通讯作者：
Tongsheng Zhang;Q. Yu;Jiangxiong Wei;P. Gao;P. Chen;Jie Hu
中科院分区：
文献类型：
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作者：
Tongsheng Zhang;Q. Yu;Jiangxiong Wei;P. Gao;P. Chen;Jie Hu
为了阐明大量补充胶凝材料的间隙级配水泥强度提高机理，量化了硬化间隙级配水泥膏体的相组成，并与波特兰水泥膏体和参考水泥（共磨制）膏体相组成进行了比较。结果表明，在所有试验龄期，含水泥熟料质量仅为25%的间隙级配水泥浆体与硅酸盐水泥浆体的凝胶生成量和孔隙率相当。对于间隙级配水泥浆体，总凝胶产物中约有40%可归因于高炉细矿渣的水化，主要不水化成分为粗粉煤灰，相当于波特兰水泥浆体中的未水化水泥熟料。此外，孔径细化在间隙级配水泥浆中更为明显，这归因于水泥浆的高初始堆积密度（粒度细化）和BFS的显著水化。
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.