Optimizing the Consumption of Intertwined Macro Synthetic Fibers to Improve the Mechanical Properties of Concrete

Improving the mechanical properties of concrete with the help of fibers is considered as one of the common methods of concrete processing. Addition of fibers to concrete increases the energy absorption and ductility of concrete and prevents the spread of cracks. Steel, polypropylene and glass fibers are the most widely used fibers. In addition, new types of macro-synthetic fibers have been introduced. In this research, in order to improve the mechanical properties of concrete, a new type of macro-synthetic fibers has been used. Samples reinforced with 2, 4, 6 and 8% of fibers were evaluated using various compressive, flexural, tensile tests as well as elastic coefficient determination tests and their optimal consumption was selected. In this research, it has been tried that the test conditions are as compatible as possible with the industry conditions so that the final results of the research are in good agreement with the current situation of the concrete industry and can be used. Comparison of test results showed that, as expected, fiber-reinforced concretes have higher compressive, flexural, tensile strength and tensile strength than conventional concretes. In addition, between different percentages of fibers in concrete, in samples with percentages greater than 2%, the rate of increase of different strengths is lower than in the case without fibers. Therefore, considering the cost of macro synthetic fibers, the most suitable percentage for reinforcing concrete with them was introduced as 2%.