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The Kelly Ball Test is a method used to measure the workability of concrete. It involves placing a standardized metal ball on a freshly mixed concrete surface and measuring the depth of the impression left by the ball after a set amount of time. The test is named after its creator, F.P. Kelly.
The Kelly Ball Test is conducted using a metal ball with a diameter of 150 mm and weighing 13.6 kg. The ball is placed on a fresh concrete surface and allowed to settle for a set amount of time, typically 15 seconds. The depth of the indentation left by the ball is then measured using a ruler or depth gauge. The test is repeated in different areas of the concrete surface to ensure consistency of results.
The Kelly Ball Test measures the workability of concrete, which refers to its ability to flow and fill the formwork or mold. Concrete with good workability is easy to place and compact, while concrete with poor workability may require excessive effort or additional water to achieve the desired result.
The results of the Kelly Ball Test are typically reported as the diameter of the indentation left by the ball. A larger indentation indicates a higher degree of workability, while a smaller indentation indicates a lower degree of workability. The results can be used to adjust the mix proportions or placement conditions of the concrete to achieve the desired workability.
The Kelly Ball Test has some limitations in terms of its accuracy and application. The test is dependent on factors such as the temperature and moisture content of the concrete, as well as the skill of the operator in placing and measuring the ball. Additionally, the test does not provide information on other important properties of concrete, such as its strength or durability.
The Kelly Ball Test is a useful method for assessing the workability of concrete, particularly in the field or on projects where other testing methods may not be feasible. However, it is important to understand the limitations of the test and to use it in conjunction with other tests and observations to ensure the quality and suitability of the concrete for its intended use.
