Tiltag til forebyggelse af den danske råstofmangel

Abrahamsen, Sarah Præstekær ; Petersen, Patrick Orbesen ; Schmidt, Caroline

4. semester

Byggeledelse (cand.polyt.), Kandidat

2023

2023-06-09

274 pages

Denne rapport omhandler restprodukter fra tre jyske råstofleverandører, og hvordan de kan anvendes i bygge- og anlægsbranchen. Det er estimeret, at 15% af alt indvundet sand, sten, ler og grus kasseres, da det ikke opfylder kravene fra slutbrugerne. Samtidig er der en forestående mangel på tilslagsmaterialer. Gennem interview med råstofleverandører og myndigheder, bliver denne problemstilling kortlagt fra forskellige synspunkter. Der er indsamlet prøver fra de tre lokaliteter, der alle betragtes som restprodukter. Disse prøver er undersøgt i laboratoriet for at sammenholde dem med branchens standarder. Sammenligningen har vist, at restprodukterne ikke overholder kravene fra standarderne, på nær ét produkt. Af denne grund foreslås det, at der udvikles en portal for aktørere, som letter den indbyrdes handel således restprodukterne kan opblandes med henblik på anvendelse. Slutteligt stilles der spørgsmål til den aktuelle råstofmangel samt afværgning heraf.

This report focuses on how to use residual aggregates from selected danish quarries. It is estimated, that around 15% of all dugged-up produce of sand, gravel, clay and stone in quarries are returned to the pits, due to them not meeting the requirements established by the industry. With regard to the promise of an increase in aggregate consumption and the decreasing availability which Denmark faces in the not-toodistant future, it is becoming an increasingly important necessity to utilise the natural aggregates in a more local and efficient way. Interviews have been conducted with a local governing body, and local quarry owners and managers, to understand and map different point-of-views in the quarrying industry. To understand why the aggregates are disposed of and to find an industrial use for them, seven types of the disposed products from three different suppliers have been acquired to undergo four experiments in laboratory: Visual identification, water content analysis, sieve analysis and compression strength of concrete with the products used as aggregrate. The results from the experiments are hereafter compared to the danish versions of European Standards regarding aggregates for concrete, mortar, unbound mixtures, and bituminous and hydraulically bound mixtures for use in road constructions and surface treatments. The results and comparisons have shown, that only one of the residual aggregates complies with the European Standard regarding aggregates for concrete. The remaining six aggregates do not comply with the standards, mainly due to the particle size distribution. Therefore, this report recommends a platform for quarry actors for facilitating the selling and buying of residual aggregates internally, so that residual aggregates from different quarries can be mixed to alter the particle size distribution to comply with the standards. Lastly, questions are raised to the imminent lack of ressources and the handling hereof, and solutions proposed by the interviewees and found through the literature search are being discussed to showcase the different perspectives on the matter.

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