偏高岭土
硅酸铝
煅烧
材料科学
泥灰岩
矿物学
化学工程
碳酸钙
方解石
碳化作用
高岭石
水泥
碱金属
粘土矿物
化学
复合材料
地质学
有机化学
古生物学
构造盆地
工程类
催化作用
作者
Nailia R. Rakhimova,В. П. Морозов,А. А. Ескин,Bulat M. Galiullin
出处
期刊:Journal of Materials in Civil Engineering
[American Society of Civil Engineers]
日期:2024-02-01
卷期号:36 (2)
标识
DOI:10.1061/jmcee7.mteng-16506
摘要
The design and development of environmentally oriented cements with predominant content of widespread noncalcined precursors contribute to a more promising future for constantly evolving alkali-activated materials (AAMs). In this study, natural and designed blends of calcined clays and abundant raw calcium carbonate minerals were investigated as binary precursors for one-part AAMs using standard techniques, thermal, X-ray diffraction, and scanning electron microscopy/energy dispersive spectroscopy (EDS) analyses. The influencing factors to set optimal parameters were the mineralogical assemblage, precursors fineness, formulation details, means of alkali reactant incorporation, and curing regimes. It was stated that hydraulic one-part AAMs can be derived from calcined marl incorporated with limestone powder containing 5.8%–7.0% of calcined clay minerals and 54.6%–60.5% of calcite or nonhydraulic one-part AAMs from a mixture consisting of 20%–30% metakaolin and 70%–80% limestone powder. It was found that, compared with a metakaolin-limestone-based binary precursor, alkali activation of calcined marl–limestone results in the formation of a higher amount of binder gel with a greater extent of Ca incorporation into the structure of Na aluminosilicate gel and the formation of Ca aluminosilicate and Ca silicate hydrogels. This provides an alkali-activated calcined marl–limestone binder system with better mechanical properties and continuous strength development, including under wet conditions.
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