Dual-crystallization waterproofing technology for topical treatment of concrete

Concrete structures and pavements are subjected to various durability problems associated with moisture penetration through the pores and the capillary networks. Published data on waterproofing has provided conflicting and inaccurate information on crystalline-based technologies. Chem-Crete Pavix DCE is a patented, dual-crystalline waterproofing technology with performance characteristics which are materially distinct from other crystalline-based technologies. It combines hygroscopic crystallization, hydrophilic crystallization and hydrophobic characteristics. This publication presents the results of experimental research work on the significant characteristics of the dual-crystallization waterproofing technology as a treatment for existing or fully cured concrete. A program of laboratory testing has been completed in compliance with applicable ASTM and AASHTO standards using common concrete design mixes, in addition to cored specimens obtained from existing concrete pavements. The investigated experimental parameters included pore size, density, permeability, water absorption, resistance to cycles of freezing and thawing, chloride ion penetration, and mechanical properties of the surface, including pull-off strength, abrasion resistance and the coefficient of friction. Treated concrete has been found to have higher density, less voids, less surface area, and lower permeability than untreated specimens. These characteristics yielded significant reduction in water absorption, significant increase in resistance to damage from freezing and thawing and to biological attack, and significant reduction in chloride ion penetration, without negative impacts on mechanical properties.