Recycling of Demolished Concrete and Masonry (Rilem Report, by T.C. Hansen

By T.C. Hansen

This new RILEM file comprises state of the art reports on 3 themes: recycling of demolished concrete, recycling of masonry rubble and localized slicing via blasting of concrete. it's been compiled via a global RILEM Committee and attracts on examine and useful event around the world.

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Extra resources for Recycling of Demolished Concrete and Masonry (Rilem Report, No 6)

Example text

Dohmann (130) studied the chemical oxygen requirement and the concentration of phenols before and after treatment of demolition wastes in two different recycling plants. One plant removed contaminants by dry-sifting and one by wet processing in an Aquamator. Unfortunately for the recycling industry the investigation showed no significant difference between the contents of dangerous chemicals before and after processing of waste in the two plants. It may be concluded that the only way an operator of a recycling plant can be certain that his products will be free from dangerous contaminants is to make sure that the contaminants do not get in there in the first place.

Recycled aggregate shall be stored and transported in a manner to prevent breakage and segregation or otherwise cause change in quality of the recycled aggregate concerned. 4. Water absorption ratio of recycled coarse aggregates is large; therefore, such aggregates should normally be used in a saturated and surface dry condition. For this reason recycled aggregate storage yards should be provided with water sprinkling facilities so that recycled coarse aggregates can be maintained at the required moist condition.

4 Grain size distribution of crusher input and output for determination of crusher characteristic of impact crusher (example). 6 Storage and handling of recycled aggregates The Japanese Proposed Standard for the ‘Use of recycled aggregate and recycled aggregate concrete’ (6) includes the following recommendations for storage and handling of recycled aggregates: 1. Recycled aggregates produced from original concretes of distinctly different quality, and recycled aggregates produced by means of different production methods shall be stored separately.

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