吴辉,倪文,崔孝炜,王爽

• 1:北京科技大学土木与环境工程学院
• 2:金属矿山高效开采与安全教育部重点实验室
• 3:商洛学院化学与化学工程系

摘要(Abstract)：

研究了掺入热闷钢渣微粉对铁路轨枕混凝土力学性能、自收缩和水化产物的影响。结果表明:钢渣微粉的掺入对抑制铁路轨枕混凝土的自收缩具有明显的效果。当钢渣微粉掺量为胶凝材料20%时,所制备的轨枕混凝土28 d自收缩值仅为未掺加钢渣混凝土的38.79%。XRD、FT-IR和FE-SEM分析表明:热闷钢渣中所含的少量较惰性的死烧游离氧化钙(f-CaO)和游离氧化镁(f-MgO)的水化膨胀,是抑制轨枕混凝土自收缩的主要膨胀源。经超细粉磨的钢渣掺入混凝土后,f-CaO和f-MgO相在混凝土中高度分散,其水化膨胀对混凝土强度无破坏作用;在混凝土硬化的中后期,体系中钙矾石(AFt)和C-S-H凝胶的协同生长,抑制了轨枕混凝土的自收缩并提高了力学性能。

关键词(KeyWords)： 热闷钢渣;铁路轨枕混凝土;自收缩;钙矾石

Abstract:

Keywords:

基金项目(Foundation): 国家高技术研究发展计划(863计划)资助项目(2012AA062405)

作者(Author): 吴辉,倪文,崔孝炜,王爽

DOI: 10.13289/j.issn.1009-6264.2014.04.002

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