Results (German): 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.
VDZ's Education and Training Programme 2022/23 ranges from the teaching of technical basics to the imparting of special technical knowledge and education courses for managers. VDZ offers individual, tailor-made seminars on the topics of clinker and cement production, maintenance, quality assurance, environmental protection and concrete technology. Almost all seminars can also be designed and implemented as inhouse seminars according to individual customer requirements. More about the training programme 2022/23 and registration at: https://vdz.info/5c78h
With its "Education and Training Programme 2021/22" VDZ supports the efforts of the industry to be successful in the long term through consistent qualification of the workforce. VDZ ensures efficient and practical learning by providing a wide range of vocational training courses and (online) seminars covering technical basics, special technical knowledge and education courses for managers.
Calcined Clays from mineral secondary raw materials
The aim of the research project is to investigate the suitability of previously largely unused mineral secondary raw materials from the stone and earth industry as a resource-conserving and climate-friendly main cement constituent. The use of cal-cined clays from secondary raw materials instead of conventional main cement constituents or high-quality primary clays can make an important contribution to the production of climate-friendly and resource-efficient cements.
Use of X-ray fluorescence analysis to determine trace element contents in cements
The aim of the research project is to develop a procedure for analysing trace elements on cements using X-ray fluorescence analysis. In addition, precision data and application limits are to be determined, which are essential in order to be able to classify the results.
Interactions of accelerating admixtures and clinker-efficient cements with several main constituents to improve the early compressive strength of concrete
The acceptance of resource-efficient cements with significantly reduced specific CO₂ emissions is still too low in construction practice. The main reason for this is that early strength is not high enough for economical production processes and also competitive construction with concrete. Accelerating admixtures can improve the early strength of concrete. The research project investigates interactions between concrete admixtures that accelerate the strength development and cements with several main constituents.
Resource-efficient use of sulphate-containing process dusts for sulphate optimisation using isothermal heat flow calorimetry
The research project analyses 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 is to be determined whether isothermal heat flow calorimetry can be used as a fast and cost-effective investigation method for this purpose.
Influences of two-stage mixing on the hydration behaviour of Portland-composite cements and composite cements as well as on the concrete performance
The acceptance of resource-efficient cements with significantly reduced specific CO₂ emissions is still too low in construction practice. The main reason is that the early strength is not high enough for economical production processes and competitive construction with concrete. The research project is investigating the extent to which more intensive mixing and further cement constituents besides clinker increase the mixing energy input and can increase the early cement hydration and thus the strength development.
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