Characterization of Limeira intrusion stones for aggregate use in engineering applications.

Major exploitation phases in quarries involve stone fragmentation by blasting and crushing. Considering the nature of stone aggregates and their applications in engineering works, technological characterizations are fundamental to the adequate selection of these stone products. The present work aimed to characterize stones with different compositional, structural, and textural aspects in a quarry belonging to the Limeira Intrusion, state of São Paulo, Brazil.

Quartzite Mining Waste: Diagnosis of ASR Alkali-Silica Reaction in Mortars and Portland Cement Concrete.

The main objective was to determine the deleterious potential of quartzite mining tailings subjected to different ASR alkali-silica reaction tests. The studies included petrographic analysis, chemical analysis of cements, expansion tests in mortar bars and concrete prisms, and microstructural analysis. Petrographic analysis of quartzites indicated high percentages of deformed quartz (95%), and were classified as potentially reactive.