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Cement based and cement free systems

Packing-density optimised face concretes for durable paving slabs


Ultra-high performance concretes were optimised for the application of two layered concrete paving slabs. One is based on ordinary Portland cement, the other is based on alkali-activated material. The basic mixes reach compressive strength values defining them as ultra-high performance concretes. The efflorescence potential is reduced and the resistance against physico-chemical impact is increased compared to standard face concretes due to the very low capillary porosity. Both face concretes were adjusted in rheological properties for the use in a hermetic press and the chemical compositions were developed to reduce efflorescence. The abrasion resistance, freeze-thaw resistance and microstructural aspects were tested for both mentioned mixes. Further improvements could be found by intentional carbonation, which was tested under controlled conditions in a CO2-reactor.

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Institute of Structural Engineering
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University of Kassel, Germany

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T +49 661 83870
T +49 661 8387270
fcn.holding@nuedling.de
www.nuedling.de

CPi worldwide journals are trade journals for the concrete and precast concrete industry that are published in 12 different language editions in more than 170 countries. These trade journals, with their practical editorial reporting on research, production and applications, are specifically addressing the decision makers of the concrete and precast concrete industry.

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