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拱坝由于具有优良的力学性能和造价的经济性,使得拱坝特别是高拱坝在我国水电工程中得以大量应用.拱坝因为体型复杂,除温度外,坝体的自重和水荷载也能在拱坝坝体内引起相当大的拉应力,因此提高拱坝混凝土的抗裂能力是人们十分关注的问题.由于PVA纤维具有极高的弹性模量,良好的韧性和阻裂性等优点,将PVA纤维掺入高拱坝混凝土中可以提高其抗裂性能,从而改善拱坝混凝土的耐久性,提高拱坝混凝土的耐久寿命.
Due to its excellent mechanical properties and economical cost, arch dams, especially high arch dams, are widely used in hydropower projects in China due to their complicated size. In addition to temperature, the dam’s self-weight and water load can Causing considerable tensile stress in the arch dam body, so to improve the anti-cracking ability of arch dam concrete is a matter of great concern.Because PVA fiber has the advantages of very high elastic modulus, good toughness and resistance to crack, The incorporation of PVA fiber into the concrete of high arch dam can improve its crack resistance, thereby improving the durability of arch dam concrete and enhancing the durability life of arch dam concrete.