Why need slump test

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Have an account? Log in Now. Concrete with slump values that are too low or too high can be identified and corrected prior to use. Some specialized, yet relatively inexpensive, testing equipment is required prior to perform the slump test. It is important that the equipment being used complies with international standards such as:. The following items are not required to perform the test itself, but will make the testing easier and can increase efficiency:.

Prior to starting the test, the mold, base plate and all testing materials should be clean and free of any remnants of prior testing. The inside surface of both the base and the mold should be dampened before beginning the test to reduce surface friction. Find a flat surface for testing and place the mold on top of the base plate. This area should also be free from vibrations. The testing should only be performed on fresh, newly mixed concrete for best results.

Fill the mold with fresh concrete in three layers see images Each layer should be tamped uniformly, 25 times using the rounded end steel rod.

Once the cone is full, level the top by removing any excess concrete from the top of the cone. The resulting unsupported concrete will therefore slump and the decrease in height should be measured to the nearest 5mm 0. True Slump — Here the general mass of the concrete drops evenly without any disintegration. This is the desired test result. The test not only observes consistency between batches, but it also identifies defects in a mix, giving the operator a chance to amend the mix before it is poured on site.

The main reason to perform the test is to ensure batches of the same concrete are of constant quality and strength. The more water is added to a mix, the weaker the concrete gets. This test is just one of the ways we ensure the quality of our concrete. Water is the enemy when it comes to concrete strengths. This easy test is carried out in just seven stages, using a slump cone, a steel rod, and a measuring stick. Depending on the water-cement ratio of the mix, the concrete slump will fall under one of four categories:.

At Total Concrete , we can create a wide range of concrete mixes at our state — of — the — art batching plant , including ready mix concrete and specialty mixes. Our knowledgeable personnel can advise on the right mix for your commercial , industrial or domestic project , and will ensure that your mix meets your every construction requirement.

To order your concrete direct to your site , simply contact us today. Concrete Slump Tests — Measuring the Workability of Concrete Concrete slump tests are a routine procedure carried out on a fresh concrete mix to determine its consistency before it is poured.