Abstract
Quality estimation of rock aggregate raw materials is often performed with mechanical tests on aggregates crushed with laboratory crushers. However, standardised mechanical tests are intended for testing products, not raw materials. Different laboratory crushers produce aggregates with varying shape properties [flakiness index (FI), shape index and surface roughness], and this has a distinctive impact on the results from mechanical tests. Setting of crushers also plays an important role in laboratory crushing of aggregates and it should be adjusted according to required particle size. Four laboratory crushers and three apparati to measure resistance to wear by abrasion from a studded tyres test (A N test) from three laboratories were compared and studied. The A N test was carried out according to the EN standard and on bar-sieved samples in order to find how FI or surface roughness affects the A N value.
Résumé
L’estimation de la qualité d’un matériau, destiné à l’élaboration de granulats, est souvent établie grâce à des essais mécaniques réalisés sur des matériaux obtenus à partir de concasseurs de laboratoire. Cependant, les essais mécaniques normalisés ont été définis pour tester les produits élaborés et non le matériau brut. Différents concasseurs de laboratoire produisent des granulats avec des propriétés de forme variables (indice d’aplatissement, indice de forme, rugosité de surface) et ceci porte à conséquence sur les résultats des essais mécaniques. Le réglage des concasseurs de laboratoire joue également un rôle important et doit permettre d’obtenir la granularité requise. Les résultats issus de quatre concasseurs de laboratoire et de trois abrasivimètres du type pneus cloutés (essais A N) ont fait l’objet de comparaisons. Les essais AN ont été réalisés suivant la norme EN et sur des échantillons issus de cribles à barreaux afin de mettre en évidence l’influence de l’aplatissement et de la rugosité de surface sur les valeurs d’abrasivité A N.
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Acknowledgements
The authors are grateful to Veli Suominen (Geological Survey of Finland), Akseli Torppa, and Paula Kosunen (University of Helsinki) for constructive consultation. We also wish to thank Hanna Järvenpää of Lohja Rudus Oy Ab, Lars Forstén of Lemminkäinen Ltd, Heli Randell and Mika Stendahl from the Finnish Road Enterprise for valuable consultations and providing laboratory facilities and to Anthony Meadows for language revision. The Graduate School in Rock Engineering and Foundation for Research of Natural Resources in Finland gave the financial support.
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Räisänen, M., Mertamo, M. An evaluation of the procedure and results of laboratory crushing in quality assessment of rock aggregate raw materials. Bull Eng Geol Environ 63, 33–39 (2004). https://doi.org/10.1007/s10064-003-0218-1
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DOI: https://doi.org/10.1007/s10064-003-0218-1