The assessment of durability, coefficient of thermal expansion, and bonding strength of latex modified mixtures in repairing restrained concrete pavements

Abstract

ABSTRACT In this study, two types of latex, Styrene–Butadiene Rubber (SBR) and Poly-Vinyl Acetate (PVA) were used as repair materials, and their various properties were examined. The assessments utilised Latex Modified Concrete (LMC) in ratios of 10%, 15%, and 20% to the weight of cement to investigate the properties of fresh and hardened concrete. The mechanical strength and durability of concrete were evaluated using porosity, water absorption, shrinkage, bonding behaviour, Coefficient of Thermal Expansion (CTE), and scaling resistance. The results indicated that LMC's mechanical properties improved, whereas its compressive strength decreased. The bonding strength between the LMC and the older concrete was more significant than between the Ordinary Portland Cement (OPC) and the substrate concrete. The SBR sample outperformed the PVA sample according to shrinkage and CTE results. Additionally, scaling resistance to deicing chemicals on concrete surfaces exposed to freezing-thawing cycles was satisfactory in concretes modified with both latexes.