Der Altersexponent für die Dauerhaftigkeitsbemessung von Beton unter Chlorideinwirkung Teil 2

The ageing exponent for the durability design of concrete exposed to chlorides part 2: Calculation examples and influences on the ageing exponent

In this second part of the article, the practical applicability of various methods for determining the ageing exponent for the durability design of concrete under chloride exposure is considered. Calculation examples are shown and evaluated on the basis of real laboratory and structural data. The focus is on the methodical evaluation of chloride profiles and the influences that can result from the determination of apparent chloride diffusion coefficients. This includes in particular the consideration of the convection zone. It is shown that both, the available and thus applicable data basis, as well as the selected evaluation methodology of the chloride profiles have a considerable influence on the determined ageing exponents. In this context, the possibilities and limitations of the methods presented are explained and discussed. The results achieved illustrate the need to formulate a standardized, transparent methodology for determining the ageing exponents of concrete, especially with regard to new cements and binders.