Taetigkeitsbericht 1984-87. Verein Deutscher Zementwerke e.V., Forschungsinstitut der Zementindustrie

SIGLETIB: ZB 1480 (1984-87) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Verein Deutscher Zementwerke - Forschungsinstitut der Zementindustrie. Taetigkeitsbericht 1993-96

SIGLEAvailable from TIB Hannover: ZB 1480(1993/96) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Taetigkeitsbericht. Forschungsinstitut der Zementindustrie, Verein Deutscher Zementwerke e.V. 1981-84

TIB: ZB 1480 (1981/84) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Feinkoernige Strassenbeton-Recyclingmaterialien als Zuschlag fuer neue Betondecken

In several countries recycled aggregate, taken from old concrete road surfaces, has been used in the road construction sector for a long time for making new concrete surfaces. Generally the aggregate is only used for the subconcrete, whilst the upper layer of concrete is almost exclusively made using conventional aggregates. The use is generally restricted to the concrete chipping over 4 mm or 2 mm. The resulting crushed concrete fine aggregate -which makes up approximately 30 to 40% of the total aggregate - is primarily used in frost blankets and hydraulically bound roadbases. However, in order to also enable a more valuable usage, for instance in subconcrete or also in the upper layer of concrete of road surfaces, comprehensive laboratory investigations had to be carried out on types of concrete with different proportions of crushed concrete fine aggregate. Starting materials from 3 motorway building sites were used in the test programme. The effect of the crushed concrete fine aggregate on the fesh concrete properties was tested (air content, workability) as well as the hard concrete properties (strength, durability, expansion, contraction). The following conclusions can be made from the results of the laboratory investigations. (orig.)Summary in FrenchAvailable from TIB Hannover: ZA 4681(779)+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman