THE EFFECTS OF UHP SURFACE PREPARATION ON CONCRETE MOISTURE LEVELS USING UHP WATER JETS

摘要

This paper documents the removal of floor coatings from concrete surfaces utilizing UHP water jet tools. Traditional methods, including shot blasting and grinding, meet the required production rates, but may fail to remove all of the invisible contaminants. They can also introduce dust into the environment. This document further illustrates the testing performed providing data, which concludes that UHP water jetting with Vacuum Recovery, does not impart moisture into the surface concrete. Earlier versions of water jetting equipment succeeded in addressing two main limitations of grit blasting, containment of media and contaminant removal, but failed to meet required removal rates. New systems are now available that combine the advantages of UHP water jetting into a system that can meet required removal rates with a single machine. Further, many believe that UHP water jetting introduces excessive moisture into the surface concrete thereby potentially causing failure of the coating. This document will prove otherwise.