Pozzolanic effect of andesite waste powder on mechanical properties of high strength concrete

Andesite stone is widely used in civil engineering and architectural applications in Turkey. Mining, cutting and polishing of andesite stone leads to the generation of significant amounts of waste material. Andesite contains SiO2 as the main component. Therefore, andesite may have pozzolanicity and thus may be used as mineral additive in concrete. In this study, the efficiency factor of andesite waste powder as a mineral additive was investigated and compared with F type fly ashes. The efficiency factors of mineral additives were also analyzed according to the curing ages of concrete specimens. Concrete specimens were prepared at various cement dosages to determine the efficiency factors of mineral additives at different replacement levels. The compressive strengths of concrete specimens were tested at 28th and 90th days. The efficiency factors were calculated by determining the variable Feret coefficient for each specimen series. For C40 strength class, the optimum replacement rate of andesite waste powder was determined as 10% at curing ages of 28 and 90 days.