Influencia del tamaño nominal máximo del agregado fino en la resistencia a la compresión del hormigón simple

Abstract

Concrete, known for its wide use in construction, is distinguished by its high compressive strength. However, certain elements, such as the maximum nominal size of the fine aggregate, can vary this strength. This research addresses how variation in fine aggregate size influences the compressive strength of plain concrete. This project studies the variations in the properties of aggregates with the sizes of #4, #8, #16, #30, #50 and #100 sieves to produce concrete according to NTE INEN standards. To obtain the dosage, the optimum density method of the Central University of Ecuador was used, varying according to the size and properties of the fine aggregate. Two strengths of 240 kg/cm2 and 280 kg/cm2 were considered, then 54 cylindrical specimens of simple concrete were prepared for each strength, 9 specimens for each nominal size of the fine aggregate, which were tested at 7, 14 and 28 days. To ensure control, 3 specimens were tested at each curing time interval and accurate information was obtained to correlate the achieved compressive strength of the plain concrete with respect to the nominal size of the fine aggregate. The results reveal a progressive decrease in compressive strength as the maximum nominal size of the fine aggregate is reduced, manifesting itself noticeably in the final strength at 28 days of curing. Likewise, variations in the properties of the finer aggregate are observed.