Durable concrete by using aluminum containing supplementary cementing materials with special consideration of interactions between additive and aggregate

• Applicant: Professor Dr.-Ing. Klaus-Jürgen Hünger
• Subject Area: Construction Material Sciences, Chemistry, Building Physics
• Term: from 2014 to 2021
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 263889994

The aim of this project is to study interactions between aluminum containing supplementary cementing materials (SCM) with the cement stone matrix, but especially as a new idea with the aggregate grains in concrete to inhibit an ASR. Dissolution experiments using different aggregates in alkaline solutions with and without SCM inside should be done. By the comparison of additives which form, based on their original composition, pure silicate, alumino silicate and aluminate structures in reaction products the mechanisms of the ASR inhibiting effect should be determined in dependence on the aluminum content of the SCM. At the same time it should be examined how can be carried out an adaption of the reactivity and amount of the suitable additive to the alkali sensitivity of the aggregate respectively. To be able to discuss the complicated processes in the concrete, it is necessary to observe the reactions of the SCM`s with the cement stone matrix and the aggregate first in separate systems. Thereby we expect results to the reaction mechanisms in more details. They should be transferred afterwards on the concrete and serve with it to derive basic principles for the kind and amount of a supplementary cementing material on the reactivity of an aggregate.

• DFG Programme: Research Grants
• Participating Person: Dr. Erica Brendler