玄武岩纤维混凝土三点弯曲梁的断裂性能

为探讨玄武岩纤维混凝土(BFRC)的断裂性能，采用《水工混凝土断裂试验规程》的三点弯曲梁法，制作缝高比为0.4的不同纤维长度及掺量的混凝土试件，利用MTS试验机对试件进行加载试验，得到玄武岩纤维混凝土三点弯曲梁的试验结果，并对P-CMOD曲线、起裂韧度、失稳韧度及断裂能等断裂参数进行分析，结果表明：掺入玄武岩纤维后，试件的断裂性能得到了提升，纤维掺量越多，纤维长度越长，P-CMOD曲线的下降段越饱满；纤维长度为18 mm、掺量为1.5%的试件起裂韧度及失稳断裂韧度的提升最为明显；纤维长度为12 mm、掺量为1.5%的试件断裂能最大。

Fracture performance of basalt fiber concrete three-point bending beam

In order to explore the fracture performance of basalt fiber concrete (BFRC), the three-point bending beam method of the Hydraulic Concrete Fracture Test Procedure was used to fabricate concrete specimens with different fiber lengths and dosages with a joint height ratio of 0.4, and the MTS test was used. The machine carried out the loading test on the specimen, obtained the test results of the basalt fiber concrete three-point bending beam, and analyzed the fracture parameters such as P-CMOD curve, initiation toughness, instability toughness and fracture energy, and obtained the following conclusions: After the basalt fiber is added, the fracture performance of the specimen has been improved. The more the fiber content, the longer the fiber length, and the fuller the descending section of the P-CMOD curve; the specimen with a fiber length of 18 mm and a content of 1.5% will start the improvement of fracture toughness and instability fracture toughness is the most obvious; the specimen with a fiber length of 12 mm and a content of 1.5% has the largest fracture energy.