Surface protection of concrete by new protective coating
作者： Elsayed M. Elnaggar , Tarek M. Elsokkary , Mostafa A. Shohide , Basil A. El-Sabbagh , Hamdy A. Abdel-Gawwad
DOI: 10.1016/J.CONBUILDMAT.2019.06.026
关键词:
摘要: Abstract This work aims at enhancing the concrete performance using a new protective coating named as asphaltic polyurethane (As/PU) coating, which prepared different NCO/OH molar ratios (1, 1.1, 1.2, 1.3 and 1.4). As/PU was by reaction of fixed amount methylene diphenyl diisocyanate (MDI) with equivalent weight mixed polyol (80% asphalt 20% polyester). The coatings examined determination curing time, dry film thickness (DFT), adhesion strength, flexibility. formulated were applied on 28-days-cured concrete. coated uncoated samples evaluated regarding contact angle, water absorption, chloride permeability. resistivity against sulfuric acid sodium solutions evaluated. preliminary results proved that increase ratio in remarkable DFT, strength accompanied decrease time flexibility coatings. sample 1.4 demonstrates highest angle associating lowest absorption In addition has positive impact mechanical properties recorded higher salt attack compared to one. proves eco-efficient use an innovative for
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