Psychologische Auswirkungen von Change Prozessen: Widerstände, Emotionen, Veränderungsbereitschaft und Implikationen für Führungskräfte

Abstract

From the view-point of economy and durability, a methodology of mix proportioning for high-performance concrete (HPC) based on the concept of using the "minimum volume of cement paste binder" is presented in this paper. Since the cement is the most expensive ingre-dient of concrete, and excessive cement in concrete usually results in a higher heat of hydration and increases creep and shrinkage that, in turn, adversely influences the durability of concrete, an essential mix-design rule is to make HPC with a minimum amount of cement. Accordingly, the minimum void content for the mixture of dry coarse aggregate, sand and mineral admixture in HPC is a major controlling factor in the proposed methodology. Two approaches for properly estimating individual amount of concrete ingredients are presented and discussed. Finally, experimental results of high-performance concrete manufacture according to the proposed proportioning meth-odology are shown and addressed for its validity.