Comparing the Effects of Two Binders, Sulfur and Portland Cement on the Permeability and Corrosion Rate of Reinforced Concrete

Abstract

Permeability plays a crucial role in determining the durability of concrete structures, particularly their susceptibility to corrosion. This study explores the potential of sulfur concrete as a protective insulator for concrete surfaces. A comparative analysis is conducted to assess the permeability of sulfur concrete (SC), conventional concrete covered with 1 mm sulfur cover (CC-SC), and conventional Portland cement concrete (CC). The investigation includes evaluations of water absorption, void percentage, and accelerated corrosion tests. The time taken for crack initiation and propagation to reach a 1 mm width is recorded. The results demonstrate that sulfur concrete exhibits lower porosity and water absorption, highlighting its waterproof properties and ability to reduce permeability. Significantly, sulfur concrete effectively blocks current flow in the accelerated corrosion test, acting as an insulating barrier. Additionally, cracks in the Portland cement concrete specimens appear after 6 and 9 days for initial crack formation and a 1 mm crack width, respectively. However, when a 1 mm sulfur layer is applied to the surface of the Portland cement concrete, the first crack occurs after 7 days, with a 1 mm crack width observed after 12 days. This indicates that the sulfur cover provides protection for the reinforced concrete and delays the corrosion process. It is important to note that although the sulfur cover delays corrosion in Portland cement concrete, it does not entirely prevent it. Further research and the implementation of additional preventive measures are recommended to address this limitation and enhance corrosion resistance.