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摘要钢纤文超高强度硅酸盐混凝土，常称为钢纤文混凝土，是在普通素混凝土中均匀掺入适量的、乱向分布的钢纤文形成的复合材料。钢纤文混凝土不仅保持混凝土自身的优点，更重要的是因钢纤文的掺入，它克服了混凝土抗拉强度低、极限延伸率小、脆性大等缺点，对混凝土基体产生增强、增韧和阻裂作用，广泛地应用于建筑、路桥和水工等工程。国内外混凝土研究者对钢纤文的作用机理做了大量的研究，一般认为，钢纤文混凝土中乱向分布的短纤文主要作用是阻碍混凝土内部微裂缝的扩展和阻滞宏观裂缝的发生和发展，从而提高基体的强度和抗冲击性，改善混凝土的韧性及混凝土结构的延性。因此钢纤文混凝土与普通混凝土相比具有一系列优越的物理和力学性能。其中，钢纤文的长径比、体积率和几何形状是决定钢纤文混凝土性能的重要参数。采用XRD、SEM等现代理化分析方法，研究水热合成工艺下，水化产物类型以及微观形貌和结构特征的影响，分析微观形貌与宏观力学性能的关系。全文取得了如下成果：⑴.综合经济、时间和施工条件等各方面因素，最优养护工艺为：高温蒸压养护，7250
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200℃蒸压养护16h。⑵.钢纤文的掺入可以明显改善硅酸盐混凝土材料的力学性能，体积掺量控制在3%以下。增强相骨料对硅酸盐混凝土材料的力学性能具有优化作用，陶砂的效果最为优异，其中以粒径为0.3~0.6mm的细陶砂的增强效果最好，掺量为0.3~0.4。⑶.成型工艺对超高强度硅酸盐混凝土材料的密实度和力学性能有一定的影响，振捣成型比加压成型效果好。
⑷.水泥熟料的水化反应产物主要是I型C-S-H和托贝莫来石。
关键词 硅酸盐混凝土 钢纤文 力学性能 蒸压养护 影响因素Title Title Title Title Preparation of Ultra-high strength of steel fiber silicate material and
Study of Dynamic Mechanical Properties
Abstract Abstract Abstract Abstract
Ultra-high strength of steel fiber silicate concrete, often referred to as the steel fiber
reinforced concrete is reinforced composite materials which is evenly mixed cement
concrete with the appropriate amount of , and chaos to the distribution of short steel
fiber . Steel fiber reinforced concrete is not only to maintain the advantages of the concrete
itself and , more importantly , due to the incorporation of steel fibers , it overcomes some
shortcomings, such as the lowed tensile strength of concrete , the lowed limit extension ,
brittleness and so on, it also optimize the concrete matrix, like enhance the intensity,
increase in toughness, impede crack and so on. Steel fiber reinforced concrete is widely
used in construction , road and bridge and hydraulic engineerin g. Concrete researchers at
home and abroad have done a lot of research on the mechanism of steel fiber, are generally
believed that, the short steel fiber's main role is to hinder the expansion of micro-cracks
and to block the occurrence and development of macro-cracks inside the concrete, thereby
increasing the matrix cracking strength and impact resistance, and proving the toughness of
concrete and the ductility of the concrete structures.Therefor, the steel fiber reinforced
concrete is more excellent than ordinary concrete, with a superior physical and mechanical
properties. Then, the aspect ratio, volume ratio, and geometry of steel fiber are important
parameters to determine the performance of steel fiber reinforced concrete.
We use XRD, SEM and other modern physical and chemical analysis to study the
hydrothermal synthesis process, the type of hydration product as well as the morphology
and structural characteristics, and analysis of the relationship between microstructure and
macroscopic mechanical properties.