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

该研究项目的目的是开发一种分析方法，以定量测定矿物建筑材料中硅酸钙水合物相（C-S-H相）的浓度。C-S-H相是水泥基材料如混凝土和许多砂浆的强度形成相。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，这一阶段的定量分析仅限于高度简化的模型系统。在真实的材料中定量分析这一阶段的可能性对于优化建筑材料以及评估损伤过程具有重要意义。在该项目中，应开发基于ATR-FT红外光谱的分析方法。初步调查导致的假设，与计划的方法，任何水泥浆，以及混凝土和砂浆与石英骨料，可以分析没有广泛的预处理。通过这种方式，可以在实验室中生产出其C-S-H相可以定量分析的真实的混凝土和砂浆。在建筑实践中，混凝土骨料中还含有许多其他矿物。这使得有必要在分析之前将骨料和粘合剂分离作为额外的制备步骤。分析程序的方法和限制条件应在项目中详细审查。

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.