Investigation on Aggressiveness of Organic Acids on Degradation of Ordinary Portland Cement Mortar
Vulnerability of concrete when exposed to low pH acidic environment is a phenomenon known for its significance in the durability of concrete structures. These hostile low pH acidic conditions attack the cement paste and disrupts the equilibrium of the matrix. Mortar specimens prepared with ordinary Portland cement (OPC) responds differently to various organic acid solutions. This study examines the acid aggressiveness on degradation of OPC mortar specimens exposed to 10% concentration lactic acid, acetic acid, citric acid and propionic acid. Acids with higher aggressiveness exhibits higher degradation. This paper compares the effects of different organic acids on cement mortar specimens in terms of mass changes, compressive strength changes and pulse velocity changes. Propionic acid and acetic acid show lower acid aggressiveness comparing to citric acid and lactic acid. Citric acid exhibits a consistency in its degradation and is of higher magnitude. The investigation of aggressiveness of organic acids on OPC mortar aids in predicting degradation to structures on acid exposure and hence preventing the eventual failure of the structure.
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.