Relationship between texture and mechanical properties of granites, central Sweden, by use of image-analysing techniques

Abstract

Rock texture is of great importance in understanding the mechanical properties of a rock. Los Angeles and studded tyre tests were used to assess the mechanical properties of homogeneous acidic plutonic and volcanic rocks and these properties were related to the rock texture using image analysis and the more common optical microscopy. The image-analysing technique was based on SEM/ BSE images, where the perimeter was measured on each mineral phase in order to numerically quantify a texture parameter. The results demonstrate that rocks with high perimeter values have the best resistance to fragmentation and abrasion. A high perimeter corresponds to ®ne-grained rocks where the minerals occur as individual grains rather than monomineralic aggregates. An increase in grain size and the formation of mineral aggregates of the same phase have a negative effect on the quality of the rock.Re Âsume  La texture d'une roche joue un ro Ãle important dans son comportement me Âcanique. L'essai Los Angeles et l'essai avec pneus cloute Âs ont e Âte  utilise Âs pour e Âvaluer les caracte Âristiques me Âca niques de roches plutoniques et volcaniques acides homoge Ánes. Ces caracte Âristiques ont e Âte  rapproche Âes d'une description de la texture base Âe sur le microscope optique. L'analyse d'image a porte  sur les images obtenues au microscope e Âlectronique a Á balayage en e Âlectrons re Âtrodiffuse Âs, ou Á les pe Ârime Átres de chaque phase mine Ârale ont e Âte  mesure Âs a®n d'obtenir un parame Átre nume Ârique relatif a Á la texture de la roche. Les re Âsultats obtenus montrent que les roches pour lesquelles ce parame Átre a une forte valeur pre Âsentent les meilleures re Âsistances a Á la fragmentation et a Á l'abrasion. Un pe Ârime Átre e Âleve  correspond a Á des roches a Á grain ®n ou Á les mine Âraux se pre Âsen-tent en grains individuels pluto Ãt qu'en agre Âgats monomine Âraux. Une augmentation de la taille des grains et la formation d'agre Âgats mine Âraux d'une me Ãme phase mine Ârale ont un effet ne Âgatif sur la qualite  de la roche.

Evaluation of selected basement complex rocks from Ado-Ekiti, SW Nigeria, as source of road construction aggregates

“…These rocks consist of a wide range of rock types varying in their texture, mineralogy and petrographic characteristics. According to previous published works reported by Akesson et al (2001), Al-Harthi (2001) and Pikriyl (2001), key characteristics such as petrographic, geochemical and physical properties of aggregates have a controlling effect on specific engineering applications. As a result, rocks with similar mineral composition but with different texture may not yield the same engineering properties and, therefore, may not be suitable for the same purpose.…”

Freeze–thaw fracturing in building granites

“…grain size (Tuğrul and Zarif, 1999;Akesson, 2001;Yilmaz et al, 2011), microstructural characteristics (Alm et al,1985;Carvalho et al, 1997;Feng and Yu, 2000;Lindqvist et al, 2007;Vasconcelos et al, 2008;Nasseri and Mohanty, 2008), mineral composition (Miskovsky et al, A C C E P T E D M A N U S C R I P T…”

Estimation of engineering properties of selected tuffs by using grain/matrix ratio

“…The number of studies that focus on the petrographic and geomechanical properties of these kinds of rocks has increased in recent years (Moon, 1993a(Moon, , 1993bStreck and Grunder, 1995;Soriano et al, 2002;Quane and Russell, 2004;€ Oner et al, 2006;Yaş ar et al, 2009;Koralay et al, 2011;Türkd€ onmez and Bozcu, 2012;Korkanç, 2013). The strength properties of rocks are affected by their mineralogical and textural features (Hartley, 1974;Ramana et al, 1986;Tu grul and Zarif, 1999;Arel and Tu grul, 2001;Akesson et al, 2001;Rigopoulos et al, 2010Rigopoulos et al, , 2011Ündül and Tu grul, 2011;Ceryan, 2014;Fener and _ Ince, 2015). Tu grul and Zarif (1999) stated that physical and mechanical properties of rocks are connected with their mineralogical and textural properties.…”