Petrographic analysis provides a detailed mineralogical assessment of aggregate materials, identifying secondary mineral content that can affect the long-term performance and durability of concrete and pavement construction. Western Geotechnical Laboratory Services (WGLS) delivers accredited Secondary Mineral Content testing using a Petrological Microscope to AS 1141.26, offered in both the standard method — 3 slides at 100 point counts per slide — and the strict method at 600 point counts per slide for projects demanding higher analytical resolution. These tests are particularly critical for identifying potentially reactive minerals that may contribute to Alkali-Silica Reaction (ASR) and other deleterious processes, giving concrete producers, structural engineers, and materials specifiers the petrological data they need to assess aggregate suitability with confidence.
