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Abrasion resistance is an essential characteristic of concrete that determines its durability and longevity under various wear conditions. Concrete surfaces are vulnerable to different types of abrasion. For instance, surfaces may wear down due to the constant movement of vehicles or be eroded by solids carried in water, as seen in concrete canal linings. Specific tests are conducted to measure the abrasion resistance of concrete.
One such test is the revolving disc test, where three plates rotate against the concrete, using silicon carbide as the abrasive substance. Another is the steel ball abrasion test, which uses rotating steel balls and water to simulate the wearing process. A third test, the dressing wheel test, employs a modified drill press that presses rotating wheels against the concrete. These tests evaluate the wear resistance of concrete by measuring the depth of the abrasion on its surface.
The outcomes of these tests are critical for understanding how concrete will hold up under conditions common in everyday structures, such as roads and hydraulic installations. The degree of abrasion resistance generally correlates with the concrete's water-to-cement ratio and compressive strength. Better resistance to abrasion is often found in concrete with a strong and durable surface layer. For optimal abrasion resistance, appropriate concrete finishing and curing methods are essential.
From Chapter 7:
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