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高韧性纤维增强水泥基复合材料(ECC)具备很好的延展性和微裂缝宽度控制能力,通过ECC与老混凝土之间的界面直剪试验,研究高韧性复合材料与普通混凝土之间的界面黏结性能,为混凝土工程的维修或加固提供试验数据。试验结果表明:随着龄期的增加,ECC抗压强度与抗折强度逐渐提高;随着砂灰比的增加,ECC黏结试件的界面抗剪强度逐渐提高,说明增加砂灰比可以提高ECC与老混凝土间的界面黏结性能;ECC与老混凝土间的界面黏结性能远优于自密实混凝土和普通混凝土,高韧性水泥基复合材料是修补桥面、路面和加固水库、大坝等混凝土工程的理想材料。
High-ductility fiber-reinforced cement-based composites (ECC) have good ductility and microcrack width control ability. The interfacial adhesion between high toughness composites and ordinary concrete is studied by the direct shear test of interface between ECC and old concrete Performance, to provide experimental data for the repair or reinforcement of concrete works. The results show that with the increase of age, the compressive strength and flexural strength of ECC increase gradually. With the increase of the ratio of sand to ash, the interfacial shear strength of ECC bonded specimens gradually increases, indicating that increasing the ratio of sand to ash can improve the ECC And the interfacial adhesion between old concrete and old concrete. The interfacial adhesion between ECC and old concrete is much better than that of self-compacting concrete and ordinary concrete. The high-toughness cement-based composite material is the key to repair the decks, pavements and reinforced concrete structures such as reservoirs and dams Ideal material.