Influence of basalt fiber length on strength characteristics of fine-grained fiber concrete

The samples of fiber concrete with different lengths of basalt fiber have been tested. The characteristics of basalt fiber used for the manufacture of fiber concrete are given. The aim of the study is to identify the pattern of influence of fiber length on the strength characteristics of fiber concrete. The paper presents the results of determining the compressive and bending tensile strength of fine-grained fiber concrete with no fiber added (control composition) and with the addition of basalt fiber 0.2 % of the weight of cement with a fiber length of 40 mm, 20 mm, 10 mm and 5 mm. It is demonstrated that the optimal limits of basalt fiber introduction into the mixture of fine-grained concrete can be considered a length of 20 mm fibers, which leads to an increase in compressive strength up to 47.2 %, in bending tensile strength up to 2 times more in comparison with the control composition.