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一、概要把短纤维均匀散开,掺入砂浆或混凝土中而形成的混合物,我们称之为纤维增强砂浆或纤维增强混凝土。这种短纤维可采用钢丝纤维或玻璃丝纤维。在隧洞等地下工程建筑物方面,我们仅有掺用钢丝纤维的施工经验,所以下面就只介绍钢丝纤维混凝土的喷射施工情况。与普通混凝土相比,钢丝纤维混凝土的优点是:①抗裂性大;②韧性非常高。这些优点,可从青函隧洞试验的成果中得到证实。例如,在混凝土中掺入5％的钢丝纤维(重量比),则其抗拉强度增加1.3～1.4倍。此外,试验表明,最大压应力点以后的变形特性呈现很大的
First, a summary of the short fibers evenly dispersed, mixed with mortar or concrete to form a mixture, we call it fiber reinforced mortar or fiber reinforced concrete. Such short fibers can be steel fiber or glass fiber. In tunnels and other underground structures, we only have experience in the construction of steel fibers mixed with steel, so the following only describes the construction of steel fiber reinforced concrete spraying. Compared with ordinary concrete, the advantages of steel fiber concrete is: ① crack resistance; ② toughness is very high. These advantages can be confirmed from the results of the Green Hole Tunnel Test. For example, the incorporation of 5% of steel fiber in concrete (by weight) increases the tensile strength by 1.3 to 1.4 times. In addition, experiments show that the deformation characteristics after the maximum compressive stress point appear great