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.
Results: Stabilisation of processes with high secondary fuel use through the injection of oxygen in rotary kiln plants in the cement industry
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.
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.
Clinker burning with alternative fuels at low process temperatures - effects on coating formation and on the corrosion of refractory products in the cement rotary kiln as well as on the performance of cement
The replacement of primary fuels by alternative fuels is of great economic and ecological importance for the cement industry and is to be increased in the future. The fuel ashes are used as raw material in the cement clinker and influence its properties as well as the coating formation on the refractory lining in the kiln. Exact knowledge of these effects is indispensable for the further increase of the alternative fuel rate and the simultaneous optimisation of the kiln operation as well as for the maintenance of the clinker quality and the service life of the refractory lining.
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.
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