In the case of recycled or RC concrete, either crushed natural stone or naturally formed gravel is partially replaced by a recycled aggregate. As a rule, this is recycled construction waste. The quality and properties of the RC concrete are significantly influenced by the quality of the aggregates. It is important to rule out contamination.
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According to the standards DIN EN 206 "Concrete" and DIN 1045-2 "Supporting structures made of concrete, reinforced concrete and prestressed concrete", RC concrete meets the requirements of the Exposure classes to conventional concrete.
the higher porosity of the aggregates, the water and cement requirements of RC concrete are higher than those of conventional concrete. In addition, a higher addition of superplasticizers is required. In addition, there are construction chemical admixtures, without which no high-performance concrete and no RC concrete can be produced. The most important action groups used here are condensers, accelerators, retarders and air voiders.
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