工程复合材料(ECC)的耐久性能试验研究进展

混凝土结构的耐久性是工程领域目前所面临的一个重要问题。而工程复合材料ECC的高延展性和抗裂性将大大改善混凝土结构的耐久性。但在实际应用之前,它必须在长期使用环境下表现出优于普通混凝土的耐久性。本文概括了ECC在冻融循环、抗硫酸盐腐蚀、抗疲劳及纤维在加速老化试验等方面表现出的显著特征,而现场试验结果表明,采用脆性的水泥基材料对脆性混凝土进行无休止的修补这种尴尬状况,有望通过应用高耐久、高韧性的ECC来改变。

Development of study on durability performance test of Engineered Cementitious Composites(ECC)

Up to now,poor durability of concrete structures is a significant problem currently facing the construction practice.The high ductility and cracking resistance of Engineered Cementitious Composites(ECC)may greatly enhance the durability of concrete structures.However,prior to designing ECC materials into practical applications,their durability performance must be shown superior to concrete over long durations in service environments.In this article,the remarkable behaviors of ECC under freeze-thaw cycles,sulfate resistance,fatigue loading,and accelerated weathering test were summarized.Additionally,the results of field test shows that the high durable and ductile ECC is expected to change this awkward condition of the endless repair of brittle concrete with brittle cement-based repair materials.