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The research project initially involved a sequence of steps to formulate robust, automated preparation methods and evaluation files and determine their reproducibility.
The research project analysed whether sulphate-rich process dusts can be used to optimise the sulphate content of cements, thereby saving anhydrite/gypsum and, in particular, improving the early strength of cements with several main constituents. Furthermore, it was to be determined whether isothermal heat flow calorimetry can be used as a fast and cost-effective investigation method for this purpose.
Various cement-chemical optimisation possibilities for cements containing fly ash with different types of hard coal fly ash were intensively investigated. Furthermore, the effects of different clinkers and sulphate carriers as well as mineral additives on hydration and strength development were determined.
The aim of the research project was to define the procedure for robust and precise dust analyses in factory laboratories in order to enable optimal utilisation of production dusts and to support process control.
The aim of the project was to address open questions of the finished project IGF 17829 N and to develop a method for determining the grading curve of aggregates in hardened concrete.
As part of the project, methods were developed that allow the cement content, cement type and additive content in hardened concrete to be reliably determined.
A database was compiled which cement manufacturers can use to influence and further optimise the formation of the melt phase by selecting suitable alternative fuels and their proportion.
The research activities continued the project “Low alkali cements with fly ash” (IGF 17249N) with two main targets. Firstly the effects of different characteristics of cements with fly ash on the release of aluminium into the pore solution were investigated. Secondly it was looked into how much each of the examined mechanisms (reduction of the alkali ion concentration, reduction of portlandite availability, release of aluminium into the pore solution, change of the cement stone microstructure) contributes to the prevention of a deleterious ASR.
