TY - CHAP A1 - Hünger, Klaus-Jürgen A1 - Kositz, Mario A1 - Brigzinsky, Maria A1 - Ajami, Fouad T1 - A fast testing method to characterize ashes and ash mixtures using the ultrasonic technique T2 - Recent Advances in Concrete Technology and Sustainability Issues Proceedings Fourteenth International Conference Beijing, China October-November 2018 N2 - Fly ash is a typical mortar constituent in Germany, other European countries and worldwide. If cement alone is used as a binder, then the mortar is too expensive and cannot provide all properties. That`s why many companies have special recipes with fly ash, especially hard coal fly ash components, in the mortar. The aim of this project is to substitute such fly ashes by lignite coal fly ashes, which are cheaper, available at every times or have better properties. However this means, that the calcium free or calcium poor ash should be substituted by calcium rich ashes, which are not certificated because of fluctuations. To compensate the fluctuations in the ash compositions, several ashes are mixed. The European standard EN 450, which contains requirements, for example for the chemical composition of ashes, has to be taken into account. Fly ash mortar compound prisms have been produced and the different mechanical and deformation values were determined in comparison to a reference material. The basis for all experiments was the recipe of the company for a special mortar. An ash compound could be developed with the same workability by considering the economic reasons of the company. An important result too is that the fluctuations of the fly ash batches can be controlled by special developed chemical (color test) and physical (Ultrasonic velocity) test methods. Y1 - 2018 UR - https://www-docs.b-tu.de/fg-baustoffe/public/A%20fast%20test%20method%20for%20ashes-huenger.pdf ER -