Reducing the environmental impact of concrete construction through new types of cement and the concrete produced from them using starting materials that are available in adequate quantities

The aim of this research project is the laboratory and industrial production and testing of cements that contain levels of limestone above the maximum content described in DIN EN 197-1. The effect of reducing the clinker in the cement on the strength development and durability of the concrete will be investigated. The effects of this substitution are to be minimized by optimizing the particle size and component distributions, targeted use of superplasticizers and, where appropriate, adaptation of the concrete technology.

It should be possible to use cements containing reduced levels of Portland cement clinker for the production of normal structural concrete of medium strength, which accounts for the majority of concrete production. The exposure classes for interior and external structural elements (XC1 to XC4, XF1 and XF3) will be taken into account.

The work is concentrating initially on investigation of mortar systems. Starting from normal cements complying with DIN EN 197-1 the clinker content is being reduced in steps with simultaneous optimization of the particle size distribution. The workability properties and strength development are being tested. The mortar investigations will be linked to the production of selected cements on an industrial scale. Particular attention will be paid to cements containing high levels of limestone and cements made with different grades of limestone. Workability properties and strength development as well as durability parameters (resistance to carbonation, resistance to freeze-thaw cycles, chloride penetration resistance, shrinkage, creep) of the concretes will be checked. The purpose of the investigations is to find out whether durable concretes can be produced with cements containing high levels of limestone. A strategy will be devised to establish how concretes containing high proportions of limestone, possibly deviating from the existing standards, can be used. The results of the research project will then be evaluated in a life cycle analysis.

Contact

Dr. Christoph Müller

Dr. Christoph Müller

Phone:
+49-211-45 78-351

Fax:
+49-211-45 78-296