Application of close-range photogrammetry in measuring concrete abrasion

Close-range photogrammetry is used as a precise measurement tool in various fields of science. Concrete structures in projects such as bridges, hydraulic structures, and dams are constantly exposed to abrasion. In abrasion tests, assessing the abrasion resistance of concrete samples depends on the accurate measurement of the volume of worn concrete over a specified time. This paper employs close-range photogrammetry to measure the volume of worn concrete in abrasion tests. Three-dimensional modelling of the sample under abrasion not only allows for precise calculation of the volume of wear cavities but also facilitates baseline profile assessments and threshold evaluations on the depth of wear cavities. In the examined sample, the accuracy of point cloud co-ordinate estimation on the feature was better than 0.22 mm. The volume of abrasion was estimated to be 12.37 cm3, with an accuracy better than 0.001 cm3. Considering the allowable abrasion volume of 15 cm3 in this test, the concrete sample passed the test; however, regarding cavity depths, with a threshold limit of 8 mm, five out of eight cavities were rejected. The results indicate that using close-range photogrammetry can enhance the accuracy of assessments compared with traditional methods at a lower cost.