Effect of the type of coarse aggregate on structure and properties of ultra-high strength concrete

粗骨料种类对超高强混凝土结构与性能的影响

• 批准号: 506665616
• 负责人: Dr.-Ing. Martin Ritter
• 金额: --
• 依托单位: Betriebseinheit Elektronenmikroskopie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/506665616?language=en
• 关键词: Effect; type; coarse; aggregate; structure

The production of ultra-high strength concrete requires high-strength aggregates. Basalt and quartzite or quartz sand are commonly used. Nevertheless, there are many other rock types that may be usable. With some of these types, chemical reactions at the aggregate-binder interface are to be expected, resulting in a very strong adhesion. At the same time there are only very few investigations on the influence of different rock types on the mechanical behaviour of ultra-high strength concrete and no investigations in which the reasons for the different behaviour were examined. Exactly this is the aim of the research project. Therefore reliable data on the influence of the rock type on compressive strength, the stress-strain curve under compression, the tensile strength in bending and the behaviour under shock will be measured. The reasons for the observed differences will be analyzed by investigating the aggregate and especially the aggregate-binder interface by high-resolution analytic methods. In particular, transmission electron microscopy will be used in combination with focused ion beam methods of sample preparation. In contrast to scanning electron microscopy, transmission electron microscopy has a resolution in the nanometer range even if used for chemical analysis. The research project therefore generates an important basis for a more sustainable and economic application of ultra-high strength concrete, with a broader range of basic materials and a scientific understanding of the effects of different rock types. The importance of ultra-high strength concrete will clearly grow by the foreseeable establishment of rules for this building material, also in Germany.

超高强混凝土的生产需要高强骨料。通常使用玄武岩和石英砂或石英砂。然而，还有许多其他类型的岩石可能是可用的。对于其中一些类型，骨料-粘结剂界面上的化学反应是可以预期的，从而产生非常强的粘附性。同时，关于不同岩石类型对超高强混凝土力学性能影响的研究也很少，也没有对产生不同性能的原因进行探讨的研究。这正是研究项目的目的所在。因此，将测量岩石类型对抗压强度的影响、压缩下的应力-应变曲线、弯曲时的抗拉强度和冲击性能的可靠数据。通过对骨料，特别是骨料-粘结剂界面的高分辨率分析，分析了观察到的差异的原因。特别是，透射式电子显微镜将与聚焦离子束的样品制备方法结合使用。与扫描电子显微镜相比，即使用于化学分析，透射式电子显微镜也具有纳米级的分辨率。因此，该研究项目为更可持续和更经济地应用超高强混凝土奠定了重要基础，使超高强混凝土的基本材料范围更广，并对不同岩石类型的影响有了科学的了解。超高强度混凝土的重要性显然将随着这种建筑材料规则的可预见的建立而增加，德国也是如此。