Mechanical properties and durability of concrete specimens containing nano silica in sulfuric acid rain condition

Abstract

During acid rain concrete begins to lose its mechanical strength that lead to cracking, weight losing and finally, destruction of structures. Since the control of acid rain and its effects on the environment is inevitable, many researchers have carried out different studies on this issue and have offered solutions to eliminate or control acid rain’s effects. One of these new methods is to use nanoparticles as cementitious or additive materials. In recent years, several studies have been focused on the nano silica, with the goal of increasing strength and durability of concrete.In this paper, the influence of nano silica on performance of cementitious materials in acid rain condition has been studied. Four concrete mixtures were prepared containing 0–6% of nano silica. Mechanical properties and durability of concrete, such as weight losing, compressive strength, electrical resistance and water absorption in acid rain condition with various pH values will be discussed.The results show that nano silica has positive effects on mechanical properties and durability of concrete specimens. In addition, by increasing the pH value of acid rain, mechanical properties and durability of concrete specimens are improved.