PERFORMANCE EVALUATION OF PORTLAND POZZOLANA CEMENT ON AGRESSIVE ACIDIC ENVIRONMENTS

Abstract

Concrete, the widely used and cost-effective construction material, is vulnerable to degradation by various acids found in ground water, sewage systems, industrial effluents, and acid rain. This study highlights the impact of acid-induced degradation on concrete structures' long-term resilience, emphasizing the need for enhanced durability and sustainability This study investigates the degradation of Portland Pozzolana Cement (PPC) mortar specimens exposed to acids commonly found in ground water, sewage systems, industrial effluents, and acid rain. The specific focus is on the effects of citric acid and lactic acid at concentrations of 0.25M, 0.5M, and 1M on the durability of PPC mortar specimens. Degradation is assessed through mass loss, ultrasonic pulse velocity (UPV) tests, and compressive strength evaluations. The research compares the traditional Static Immersion method and the Accelerated Acid Abrasion Resistance Test (A3RT) to determine degradation kinetics. Results indicate that prolonged acid exposure leads to increased degradation of PPC mortar specimens. Citric acid shows higher degradation rates compared to lactic acid. The findings emphasize the importance of acid concentration when assessing concrete durability in acidic environments. This research provides valuable insights for designing and maintaining concrete structures in acidic environments, enhancing their long-term resilience and sustainability.