Analysis of epoxy based paint efficiency in expanded clay lightweight concrete protection of sulfuric acid attack

ABSTRACT The purpose of this study is to analyze the efficiency of epoxydic base paint used as a protective coating on expanded clay lightweight concrete under sulfuric acid (H2SO4) attack. External attacks can promote expansions and accelerated degradation, reducing the concrete durability. Developed protections, such as paints have an important performance result, because they have good adhesion to the concrete surface, weathering and photodegradation resistant, besides provide a good chemical stability. The performance of epoxydic paint was assessed through visual inspection, compressive strength test, water absorption and mass losses before and after chemical attack. The visual inspection demonstrated that the epoxy-coated lightweight concrete specimens had a clear reduction in the loss of cohesion of the paste caused by the attack. The teste results of regarding water absorption, mass loss and mechanical strength showed the good performance of the epoxydic base paint, preventing the penetration of the aggressive agent on protected concretes. This research shows that epoxydic protection reduces the impact of external acid attacks on concrete and can improve the durability of expanded clay lightweight concrete structures.

摘要 本研究旨在分析环氧树脂基涂料（epoxydic base paint）作为防护涂层，在硫酸（H₂SO₄）侵蚀作用下对膨胀黏土轻质混凝土（expanded clay lightweight concrete）的防护效能。外部侵蚀会引发膨胀并加速劣化，降低混凝土的耐久性。经研发的防护措施（如涂料）具备优异的防护性能，其不仅可与混凝土表面实现良好黏附，兼具耐风化、抗光降解特性，同时还具备优良的化学稳定性。本研究通过外观检测、抗压强度试验、吸水率测试以及质量损失率测定，于化学侵蚀前后对环氧树脂基涂料的防护性能开展了评估。外观检测结果显示，经环氧树脂基涂料防护的轻质混凝土试件，由侵蚀引发的浆体黏结性损失得到了显著缓解。吸水率、质量损失及力学强度的测试结果表明，环氧树脂基涂料性能优异，可有效阻隔侵蚀性介质侵入受防护的混凝土。本研究证实，环氧树脂基防护涂层可削弱外部酸性侵蚀对混凝土的影响，能够提升膨胀黏土轻质混凝土结构的耐久性。