钢纤维的主要性能包括抗拉强度与黏结强度。试验表明,由于普通钢纤维主要是因钢纤维拔出而破坏,并不是因钢纤维拉断而破坏,因此钢纤维的抗拉强度一般能满足使用要求,而其与混凝土基体界面的黏结强度是影响钢纤维性能的主要因素。黏结强度除与基体的性能有关外,就钢纤维本身而言,与钢纤维的外形和截面形状有关。一般情况,混凝土在冲击条件下的断面比较平整,试件断成2-3块,相互独立不连接,且块体较大。而钢纤维破坏过程中,在主裂纹中又伴随多条分支裂纹、细裂纹充及稳态微裂纹。同时又由于钢纤维造成的网状结构的牵引、拉纤作用,钢纤维的真坏断面凸凹不平,所以具有更大的吸收能量的能力,研讨会块较多,较细,试件的边缘破坏严重。
The main properties of steel fibers include tensile strength and bonding strength. Experiments have shown that due to the fact that ordinary steel fibers are mainly damaged by steel fiber pull-out, not by steel fiber breakage, the tensile strength of steel fibers generally meets the requirements of use, and the bonding strength between them and the concrete matrix interface is the main factor affecting the performance of steel fibers. The bonding strength is not only related to the performance of the matrix, but also to the shape and cross-sectional shape of the steel fibers themselves. In general, the cross-section of concrete under impact conditions is relatively flat, and the specimens are broken into 2-3 independent and unconnected blocks, with larger blocks. During the process of steel fiber failure, multiple branching cracks, fine cracks, and steady-state microcracks are accompanied by the main crack. At the same time, due to the traction and pulling effect of the mesh structure caused by steel fibers, the true damaged section of the steel fibers is uneven, so they have greater energy absorption ability. There are more and finer specimens, and the edges of the specimens are severely damaged.
钢纤维中乱向分布的短纤维主要作用是阻碍混凝土内部微裂缝的扩展和阻滞宏观裂缝的发生和发展。在受荷(拉、弯)初期,水泥基料与纤维共同承受外力,当混凝土开裂后,横跨裂缝的纤维成为外力的主要承受者。因此钢纤维与普通混凝土相比具有一系列****的物理和力学性能。
The disorderly distribution of short fibers in steel fibers mainly hinders the expansion of micro cracks inside concrete and hinders the occurrence and development of macroscopic cracks. In the early stages of loading (tension, bending), cementitious materials and fibers jointly bear external forces. When the concrete cracks, the fibers crossing the cracks become the main bearers of external forces. Therefore, steel fibers have a series of physical and mechanical properties compared to ordinary concrete.