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The aim of the research project was to develop a procedure for analysing trace elements on cements using X-ray fluorescence analysis. In addition, precision data and application limits were to be determined, which are essential in order to be able to classify the results.
The aim of the research project was to investigate the suitability of largely unutilised mineral secondary raw materials from the stone and earth industry as a resource-conserving and climate-friendly main cement constituent. The utilisation of calcined clays from secondary raw materials instead of conventional cement main constituents or high-quality primary clays can make an important contribution to the production of climate-friendly and resource-efficient cements. This means that the transformation process of the cement industry can be shaped in a way that is not only cli-mate-friendly but also resource-efficient.
The objective of the research project was to determine the reliability of reinforced concrete structures, planned and built according to DIN 1045:2001, ZTV-ING and ZTV-W. The structures selected were exposed to carbonation (XC), chlorides (XD) and freeze-thaw (XF).
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.
The possibilities and limits of using recycling (RC) gypsum for cement production were determined. The findings of the research project will help to compensate for the future elimination of gypsum from flue gas desulphurisation (FGD), conserve natural resources and reduce the amount of waste going to landfill
The subject of the IGF research project 22502 N was the application of X-ray diffraction analysis for production and quality control of calcined clays and cements produced with them, in order to accelerate the development of cements with further reduced clinker content within the framework of the decarbonisation of the cement industry.
In the research project, testing methods were put to the test and an evaluation concept for fresh concrete leaching was developed. The derived maximum permissible releases were significantly lower than in all applications, so that, from the research centres' point of view, there is no need for testing or regulation of fresh concrete releases.
In the ZIM research project, used concrete is processed in such a way as to improve the usability of all fractions generated, in particular the crushed sand and the fine fraction. To this end, tests are also being carried out on the pozzolanic reactivation of the recycled concrete fines.
