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Title: Highly Durable Concrete based on Calcined Clays

Author(s): Eugen Kleen and Matthias Gay

Publication: Symposium Paper

Volume: 326


Appears on pages(s): 6.1-6.8

Keywords: acid resistant concrete, calcined clays, chemical superplasticizer, concrete additions; durability, sewage infrastructure, ready-mix concrete

DOI: 10.14359/51710976

Date: 8/10/2018


For the production of concretes with an extended service life a range of admixtures and additions are available. For these concretes polycarboxylate ether (PCE) based superplasticizers are the product of choice. Specially designed additions are necessary to achieve the required performance and service life. In this paper the tailor-made development of these products is described and their structure activity relationship with cement is discussed.

A well balanced PCE combines a high water reducing effect with a limited influence on the setting time and, therefore, the strength development. Very important for the use of concrete the workability window can be adjusted for the required period of time. It is shown which components of the polymer have to be linked to the required performance in fresh and hardened concrete. Furthermore, the development of calcined clays and their reactivity in highly durable concretes is described and discussed. The results of x-ray investigations show the enhanced performance of calcined clays.

Derived from these investigations the focus is on ready-mix production and use of highly durable concretes on construction site. The benefit for a sustainable development of the construction industry is the durability and therefore the reduction in use of natural resources. As a highlighted example the Emscher Project is described and the use of calcined clays based concretes with enhanced acid resistance in that project. From that project general recommendations on the development, production and use of highly durable concretes are derived.