Chemical attack from external agents on concrete is the main reason for the loss of durability. The chemical attacks can be: acidic attack, alkali attack, carbonation, chloride attack, sulfuric attack and leaching. Sulfuric ions tend to initiate sulfuric attack. Since sulfuric compounds are formed as a result of the sulfuric acid-cement paste reaction, the increase in sulfuric content of concrete specimens could be used as a measure of the chemical manifestation of deterioration. Resistance to aggressive chemicals is the most important engineering property of concrete governing its durability. This research will focus on studying the resistance of mortar, UPR, BASF and Sika repair materials to sulfuric acid attack in the different dimension of concrete sample.
The content of sulfuric acid that immersed in the specimen was 1%, 3% and 5% of 55 concrete cylinders specimen with 46 cylinders for each type of repair material used. The investigation conducted was weight and diameter changing, compressive strength test, XRF and XRD.
Normal concrete, SIKA, Mortar, BASF nanocrete experience the diameter reduction significantly except UPR that can maintain the diameter itself of 5.5 cm. UPR mortar 50% was the better concrete specimen compared the others specimen that has good resistance of sulfuric acid attack. The effect of sulfuric acid on the concrete repair material was caused some damages in the physical properties of specimen. Sulfuric acid decrease the strength of specimen, reduce the diameter and weight of concrete also broke the structure of repair concrete specimen.