以未磨的鞍钢齐大山铁尾矿为骨料,以铁尾矿、高炉矿渣、水泥熟料和天然石膏3级梯级混磨产品为胶凝材料制成铁尾矿混凝土试块,对直接标准养护、先56℃蒸汽养护再标准养护、先90℃蒸汽养护再标准养护的混凝土试块进行了强度、水化产物及微观结构分析.结果表明:与直接标准养护比较,先56℃蒸汽养护可以提高试块不同龄期的强度,但先90℃蒸汽养护仅能提高试块的早期强度、对后期强度有负面影响；不同养护方式都形成由石英,未水化的C3S和C2S,水化产物CH、钙矾石和C-S-H凝胶组成的致密的铁尾矿高强结构材料,但对铁尾矿混凝土的水化硬化过程有重要影响.%With Angang Qidashan unground iron tailings as aggregate mixed with cementitious materials of iron tailings , blast furnace slag, cement clinker and natural gypsum of level 3 step mixed grindings, the concrete blocks of iron tailings are prepared. The concrete blocks under direct standard curing, 56 ℃C then standard steam curing and 90 ℃ then standard steam curing are separately analyzed from aspects of its strength, hydration products and microstructure. The results show that compared with the standard curing, 56 ℃ steam curing can improve the blocks strength at each stage, however 90℃ steam curing only improve the early blocks strength and have a negative impact on the later strength. All curing methods can form the compact high-strength iron tailings material consisting of quartz, the un-hydrated C3S and C2S, hydration products CH, ettringite and C-S-H gel, but have a different impact on the hydrating and hardening process of the i-ron tailings concrete.
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