ACID AND SULPHATE RESISTANCE OF NANO SILICA RUBBERIZED ENGINEERED CEMENTITIOUS COMPOSITE

The main objective of this study is to determine the acid and sulphate resistance of Engineered Cementitious Composite (ECC) incorporating crumb rubber and nano silica. Response Surface Methodology (RSM) is utilized to obtain 13 mix design with the percentage of crumb rubber ranging from 0% to 6.035%. The percentage of nano silica in the mixture are ranging from 0% to 4.83%. PVA fibers are kept at a constant percentage of 2% to avoid balling effect. Four laboratory tests were used for this investigation, which are compressive strength, acid resistance sulphate resistance, and efflorescence. The samples were evaluated for residual compressive strength. The Response Surface Methodology (RSM) technique was employed to establish predictive responsive models and multi-objectives. The optimization results of the prediction model were used to achieve the optimal solution variables. Nano silica has the ability and properties to overcome the limitation of crumb rubber incorporated ECC with the optimum dosage. Furthermore, rubberized ECC with nano silica has better chemical attack resistance (acid attack, sulfate attack and efflorescence) in comparison with normal concrete.