Assessment of Rock Aggregate Quality Through the Analytic Hierarchy Process (AHP)
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ORIGINAL PAPER
Assessment of Rock Aggregate Quality Through the Analytic Hierarchy Process (AHP) Ekin Ko¨ken
. Soner Top . Ahmet O ¨ zarslan
Received: 29 October 2019 / Accepted: 7 May 2020 Springer Nature Switzerland AG 2020
Abstract The present study aimed to assess rock aggregate quality through the Analytic Hierarchy Process (AHP). In the context of the AHP analyses, four rock types (i.e., andesite, basalt, granodiorite, and gabbro), five evaluation criteria, and several technical requirements/suggestions for coarse aggregates related to bituminous paving mixtures were considered. In order to set over the evaluation criteria, detailed laboratory studies were conducted. For this purpose, various mineralogical, physical, and mechanical aggregate properties were determined for each rock type concerning their weathering grades. As a result of the laboratory studies, it was determined that the rock weathering processes have substantial negative impacts on the rock aggregate properties considered in this study. The AHP analysis results indicated that that different rock types have several advantages concerning various evaluation criteria. Based on the general evaluation point (EP) of the rocks, the gabbros were found to have the highest rock aggregate quality (EP = 0.393). In contrast, the andesites had E. Ko¨ken (&) S. Top Materials Science and Nanotechnology Engineering Department, Abdullah Gu¨l University, 38010 Kayseri, Turkey e-mail: [email protected] ¨ zarslan A. O Mining Engineering Department, Zonguldak Bu¨lent Ecevit University, 67100 Zonguldak, Turkey
the lowest quality (EP = 0.069). Besides, the basalts (EP = 0.271) and granodiorites (EP = 0.267) presented approximately the same quality for their use in bituminous pavement mixtures. It was also demonstrated that the AHP, with its specific methodology, can be utilized to represent different environmental and mechanical conditions by changing the relative weight of the evaluation criteria. In this way, the pros and cons of different rock types could be revealed quantitatively, which enables related engineers to select proper rock types for their use under different environmental and mechanical conditions. From this point of view, the present study could be declared a case study noted for combining theoretical and practical approaches on bituminous paving mixtures as a sign of rock aggregate quality. Keywords Analytic hierarchy process Crushed stone Aggregate quality assessment Rock weathering
1 Introduction Aggregates are granular geomaterials composed of crushed rocks on a large scale. They are the world’s leading construction and building resources concerning both tonnage and economic value. Addressing,
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Geotech Geol Eng
serviceability, and long-term durability of rock aggregates are the issues that have a direct link to their quality. In this context, crushed rocks with different size fractions have been utilized regarding their material properties such as strength, hardness, and ab
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