A NOVEL APPROACH OF INTRODUCING CRYSTALLINE PROTECTION MATERIAL AND CURING AGENT IN FRESH CONCRETE FOR ENHANCING HYDROPHOBICITY

Abstract

A new line of research to enhance the performance of concrete under adverse (harsh) and normal (air cured) curing 25 conditions is presented. A crystallising hydrophobic admixture and curing agents were added to fresh concrete to 26 improve its resistance against severe environmental conditions. A two-stage approach was pursued by adding the 27 crystallising admixture to fresh concrete followed by curing agents, in a wax and liquid forms, in a separate 28 application process, followed by exposing concrete to normal and adverse curing conditions. Results obtained 29 suggests that protecting concrete with the crystallising admixture followed by applying wax based curing agent 30 improves concrete strength and its resistance to water ingress than concrete cured with the liquid curing agent. 31 When following the crystallising-wax treating system under adverse curing conditions, a more conserved strength 32 was noticed compared to that produced by the crystallising-liquid system. Using the liquid curing agent in concrete 33 with high water to cement ratio (w/c) has increased the cracks in the internal structure, while water permeability 34 has decreased, either under normal curing conditions or adverse conditions. Following this protection-curing 35 system in industry would resolve the problem of applying protection on wet surfaces and increase concrete’s 36 resistance to deterioration. A microscopic study of the crystallising material was attained with a Scanning Electron 37 Microscope (SEM) to check crystal growth with time.