What type of test can be performed on-site to verify the consistency of delivered concrete?

The slump test is a practical and commonly used procedure for on-site testing of concrete consistency. It measures the workability or fluidity of fresh concrete before it sets. During the test, a cone-shaped mold is filled with concrete, and then the mold is removed, allowing the concrete to slump under its own weight. The vertical distance that the concrete drops is known as the slump, which directly correlates to its consistency.

A higher slump indicates a more workable mixture, while a lower slump suggests a stiffer mix. This test is important because it provides immediate feedback on the properties of the concrete being used, ensuring that it meets the specified requirements for the project. It is a simple, efficient, and cost-effective method to help workers assess concrete before placement, enabling adjustments if necessary.

In contrast, other tests mentioned do not effectively serve this particular purpose. The scrape test and filter test are not standard practices for assessing concrete consistency, while the pile test is focused on evaluating the bearing capacity of piles rather than the properties of the concrete itself. Thus, the slump test is the most appropriate method for verifying the consistency of delivered concrete on-site.