Abstract
This paper presents development of three-dimensional characterization of concrete abrasion using the ASTM C1138 test method, which simulates underwater abrasion. To this effect, a measuring system was designed based on laser triangulation with linear illumination of the surface measured. The system allows for contactless, quick and precise measuring of average wear and other topological characteristics dependent on the type of the tested concrete. Validation results show that the system’s precision is better as conventional weighting method (<15 gram) and furthermore it allows us to analyze the spatial distribution of wear.
Highlights
The damage of the concrete surface due to the abrasion of the bed load transported by the flowing water is one of the main problems to be addressed in the operation of hydraulic structures
From the abrasion resistance tests of the concretes used on the Sava River it was concluded that the ASTM C1138 was the most appropriate test method [1] and [2]
The testing of wear of concrete specimens takes a total of 72 hours, where the wear measurements using the abovementioned system are performed at 3-hour time increments. 10 repeated 3D measurement are performed and averaged to improve the measuring accuracy at each time increment
Summary
The damage of the concrete surface due to the abrasion of the bed load transported by the flowing water is one of the main problems to be addressed in the operation of hydraulic structures. In an effort to increase method selectivity in high-performance concretes, the investigations to date included various modifications to the standard procedure, such as: intensifying water mixing in the container [7], extending the test duration [7] and [8], and studying the possibilities of increasing the accuracy of wear measurements by using a contact, three-dimensional coordinate-measuring machine (CMM) [8]. The relief image of the concrete specimen’s surface wear facilitates interpretation of the physical processes characteristic of the device’s functioning and the movement of steel balls during the test The accuracy of such a procedure depends on the size of the point data acquisition and increases with the densification of data acquisition; on the. We describe the measuring system adapted to the requirements and needs of the ASTM C1138 test method, the measuring procedure, the analysis of measurements, the validation of the method in terms of repeatability of measurements, and the comparability of the results with those obtained using the standard prescriptive method
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