Striated fiber-based concrete reinforcement

A composite structure comprising:

• a concrete matrix comprising ultrahigh performance concrete;
• and
• a fiber embedded in the concrete matrix, the fiber comprising steel;
• wherein a surface of the fiber has a series of striations, the series of striations being arranged in a striation pattern;
• wherein each striation of the series of striations has a depth less than a length of the striation, the series of striations being configured to increase ductility of the concrete matrix;
• and
• wherein the fiber has a length of 19 mm or less, has a diameter falling in a range from 0.1 mm to 0.2 mm, and is not mechanically deformed.