Quantification of the strength forming-phase in cementitious materials (C-S-H)

胶凝材料中强度形成相的量化 (C-S-H)

• 批准号: 280067300
• 负责人: Professor Dr. Jürgen Neubauer
• 金额: --
• 依托单位: Institut für Baustoffe, Bauphysik und Bauchemie B-3
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/280067300?language=en
• 关键词: Quantification; strength; forming; phase; cementitious

Aim of the research project is the development of an analysis method to quantitatively determine the concentration of the calcium-silicate-hydrate-phase (C-S-H-phase) of mineral building materials. The C-S-H-phase is the strength-forming phase of cementitious materials as concrete and many mortars. Due to the importance of these materials one can say that our built environment to a large extent is based on C-S-H. The quantitative analysis of this phase is up to now restricted to strongly simplified model systems. The possibility to quantitatively analyze this phase in real materials is of great importance for the optimization of building materials, as well as for the assessments of damage processes. Within the project an analysis method based on ATR-FT infrared spectroscopy is supposed to be developed. The preliminary investigations lead to the hypothesis that with the planned methodology any cement paste, as well as concrete and mortar with quartz as aggregate, can be analyzed without extensive pretreatment. In this way real concrete and mortar whose C-S-H-phase can be analyzed quantitatively are producible in the laboratory. In the construction practice concrete contains also many other mineral in the aggregate. This makes it necessarily to separate aggregate and binder as an additional preparation step before the analysis. Methodology and limiting conditions of the analysis procedure are supposed to be examined within the project in detail.

本研究项目的目的是建立一种定量测定矿物建材水化硅酸钙相(C-S-H相)浓度的分析方法。C-S-H相是混凝土和许多砂浆等胶凝材料的强度形成阶段。由于这些材料的重要性，可以说我们的建筑环境在很大程度上是基于C-S-H。到目前为止，对这一阶段的定量分析仅限于高度简化的模型系统。在实际材料中定量分析这一阶段的可能性对于建筑材料的优化以及对破坏过程的评估非常重要。在该项目中，预计将开发一种基于ATR-FT红外光谱的分析方法。初步调查得出的假设是，按照计划的方法，任何水泥浆体，以及以石英为骨料的混凝土和砂浆，都可以在不进行大量前处理的情况下进行分析。通过这种方法，可以在实验室生产出能够定量分析C-S-H相的真实混凝土和砂浆。在施工实践中，混凝土骨料中还含有许多其他矿物质。这使得有必要在分析前将骨料和粘结剂分离作为额外的准备步骤。分析程序的方法和限制条件应在项目内进行详细检查。