Abstract
To accurately compare the alkali activity of aggregates, this paper proposes applying microscopic imaging and computer image analysis technology to calculate active mineral content in lithofacies examination and analyze its correlation with the rock aggregate expansion rate. The results show that SiO2 is the main chemical component of metamorphic rocks, and its content is over 60%. Low-grade metamorphic rocks in Guizhou province are composed of sericite, feldspar, quartz, calcite, and other minerals. The active minerals are mainly microcrystal quartz and strain quartz, and their active interference color is different from other inactive minerals. Equipped with microscope imaging and computer image analysis technologies, computers can quantitatively and qualitatively estimate the active mineral content of rocks. Compared with the conventional lithofacies method, the results are more accurate, the acquisition parameters can be saved, and the analysis is faster. Furthermore, the calculation results of alkali active mineral content of rock correlate with the expansion rate measured by the rapid mortar bar method.
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