Effect of Concrete Composition on Splitting Cracks in Prestressed Concrete Railroad Ties
Kansas State University researchers conducted fracture toughness (FT) tests on four, 3-point bending concrete specimens for each mixture type. Next, they fabricated pretensioned prisms with varying amounts of concrete covering the reinforcements. The prism strength was 4,500 psi when de-tensioned. Finally, they quantitatively evaluated the splitting cracks in each specimen by direct measurement of the crack lengths. The results indicated a strong correlation between crack length and FT.