Compressive strength and change in length of concrete by replacing fine aggregate with recycled glass exposed to sulfates (#1639)

Authors

Cerna Vasquez, Marco Antonio

Bocanegra Amoroto, Oscar

Orbegozo Pinedo, Omar

Abstract

This research was conducted in the city of Trujillo to evaluate the influence of partial replacement of fine aggregate with recycled glass on the mechanical properties of concrete with a design strength of f’c = 280 kg/cm². Using a quantitative approach and a quasi-experimental design, 120 cylindrical specimens (100x200 mm) were tested for compressive strength at 7, 14, 28 and 56 days, five core samples were drilled to assess the compressive strength of slabs at 28 days, and 60 prismatic specimens (75x75x285 mm) were evaluated for length change at 7, 14, 28 and 56 days. The greatest increase in compressive strength was observed in the C10V treatment, achieving improvements of 8.35% and 14.21% at 28 days under standard curing and sulfate-modified curing (S1), respectively, meeting ASTM C39 and ACI 318-19 standards. Additionally, the C10V treatment reduced length change by up to 35% at 28 days. However, under sulfate-modified curing (S1), the C20V concrete and the control concrete exhibited better performance. All treatments remained within the limits recommended by ACI 201.2R-01, staying below 0.02% up to 14 days and 0.20% at 28 days as recommended by ASTM C126, indicating that expansion does not compromise concrete durability. In conclusion, the partial replacement of fine aggregate with recycled glass is viable, as it enhances compressive strength and reduces length change, contributing to longer concrete durability while improving some of its mechanical properties.