碱激发胶凝材料:早期成核、化学相演变和体系性能（英文）

Alkali-Activated Binders:Early Age Nucleation Reactions,Chemical Phase Evolution and Their Implications on System Properties

近些年,通过碱激发硅铝酸质材料形成聚合物水泥基材料的研究受到了广泛关注。由于在此聚合物胶凝体系中,硅铝质原料存在多样性,包括粉煤灰、矿渣、煅烧高岭石等,因此其原料化学性质在动力学和固相演变过程中起到非常重要的作用,并决定了最终产品的化学和物理性质。分析了原料化学组成对从溶解到最终水化产物性能的碱激发全过程的影响。并使用了包括X射线同步衍射分析在内的一系列分析技术对多种原料的无定形和沸石状结构进行了表征。研究了具有特定无定形SiO_2/Al_2O_3比的钠锅硅酸盐沸石在Al_2O_3-SiO_2-H_2O凝胶中的结晶趋势,并基于可识别的三元相图中的组成结构,研究了钙离子和剩余阳离子种类的主要影响。讨论了不同体系的相组成和化学成分、物相转变、微观结构变化及其长期强度发展和耐化学性的关系。

Formation of polymeric cementitious binders via alkaline activation of aluminosilicates has gained significant attention within the manufacturing and building sectors in recent years. Given the diversity of aluminosilicate source materials employed in these systems, such as fly ash, blast furnace slag, calcined kaolinite, etc., the chemistry of raw materials play a crucial role in both kinetics and stability of solid phase evolution which govern chemical and physical properties of resultant products. This paper analyses the effects on elemental composition of raw materials on the overall alkaline activation process; from dissolution to end-product properties. A range of analytical techniques including X-ray synchrotron analysis has been used to characterise amorphous and zeolitic domains from a range of raw materials. In particular, the tendency of aluminosilicate source materials with defined amorphous SiO2/Al2O3 ratios to nucleate sodium aluminosilicate zeolitic phases originating from NaaO-Al2O3-SiOE-H2O gel assemblages is investigated, alongside the dominant influence of Ca ions and residual cationic species based on identifiable compositional domains within ternary phase diagrams. Stable phase assemblages and optimal compositional ranges for different systems are discussed with respect to phase development, microstructural changes and their relationship to long term strength development and chemical resistance.