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Research projects on the subject Chemistry and mineralogy


Current

Effects of pre-hydration on the performance of cements and the influence of different clinker properties

The research project has two objectives. The first is to investigate whether certain chemical / mineralogical properties can make clinker more robust against pre-hydration effects. Secondly, it will be investigated which measures can be taken to counteract possible negative effects, in particular by adjusting the sulphate carrier composition.

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Completed

Interactions between siliceous fly ash or calcined clay as cement main constituent and superplasticizers based on polycarboxylate ether as well as their influences on rheological properties of fresh cement paste and fresh concrete

It was determined how the rheological properties and the consistency of fresh concrete can be improved by the adjustment of the type and proportion of fly ash or calcined clay in the cement to the clinker as well as the type and dosage of the superplasticizer.

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Completed

Cement chemical optimisation of cements containing fly ash

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.

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Completed

Concept for retrospective determination of the concrete composition, the grading curve as well as further properties of aggregates or the cements in hardened concrete

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.

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Completed

Optimisation of the X-ray analysis of dusts from clinker production as a basis for their utilisation and process control

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.

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Completed

Development of an analysis concept for the quantification of cement, its main constituents as well as additives 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.

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Completed

Influence of the reduction of melting point and viscosity of the clinker melt by ashes of alternative fuels on sintering reactions and coating formation

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.

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Completed

Prevention of a deleterious ASR with Portland-fly ash cement – mechanisms in concrete

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.

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