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首页> 外文期刊>Construction and Building Materials >Applying a polyurea coating to high-performance organic cementitious materials
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Applying a polyurea coating to high-performance organic cementitious materials

机译:在高性能有机胶凝材料上涂覆聚脲涂料

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摘要

Polyurea is a polymeric material that can be used to provide environmental protection and structural enhancement. In this study, a low modulus polyurea coating, having high elongation and energy absorption capacities and a fast gel time, was sprayed under field conditions onto the surfaces of cementitious materials. Compression tests were conducted to establish the wet-dry performance of uncoated and cir-cumferentially coated cylinders fabricated from a high-performance matrix constructed with Poly(vinyl butyral) (PVB) as the only aggregate. Results showed that the coating increased the compressive strength of specimens exposed to both fresh and sea water environments. Similar results were obtained when a lightweight matrix containing sand was subjected to the same sea water environment. Flexure tests were conducted on uncoated and fully encapsulated plates kept under normal operating conditions to establish the stress-strain behavior of these two matrices, as well as a PVB matrix with Poly(vinyl alcohol) (PVA) fibers added as reinforcement. Results showed that the addition of the fibers and the coating increased the ultimate flexural strength, decreased the stiffness, allowed the structure to sustain higher strains prior to failure, and increased the fracture toughness. Comparisons are made between the performance of lightweight and high-performance concretes.
机译:聚脲是可用于提供环境保护和增强结构的聚合材料。在这项研究中,将具有高伸长率和能量吸收能力以及快速胶凝时间的低模量聚脲涂料在田间条件下喷涂到水泥质材料的表面。进行压缩测试以建立由高性能基质(由聚乙烯醇缩丁醛(PVB)作为唯一的骨料制造)制成的未涂覆和环形涂覆的圆柱体的干湿性能。结果表明,该涂层提高了暴露在淡水和海水环境下的样品的抗压强度。当含有沙子的轻质基质在相同的海水环境下使用时,获得了相似的结果。在保持在正常操作条件下的未涂覆和完全封装的板上进行了挠曲测试,以建立这两个矩阵以及添加了聚乙烯醇(PVA)纤维作为增强材料的PVB矩阵的应力应变行为。结果表明,纤维和涂层的添加增加了极限抗弯强度,降低了刚度,使结构在破坏前能承受较高的应变,并提高了断裂韧性。比较轻质混凝土和高性能混凝土的性能。

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