What is Concrete Slump: Everything You Need To Know
How often did you try to find or check with your contractor that how do they decide the quality and quantity of concrete to be used and its stability be checked against any set parameters? Well, in most of the cases the answer will be a big NO! That’s perhaps why knowing what is concrete slump is important.
Concrete is widely used in building and construction of buildings, road, and repair works and in other works of the foundation. We all tend to ignore once we provide the contractor a specific quality or standard of constitute. It will all depend on him to decide the mix and strength of the concrete without understanding the need of the type of concrete to be used in the project.
Why Is Concrete Quality Important?
To understand, why you need to check the quality of concrete, you must first understand what concrete is. Concrete is a composite material consisting of coarse aggregate which is stick together with fluid cement. Most of the times, the concrete used is lime-based and is termed as the Portland cement concrete.
When a course is mixed with Portland cement and water, it produces a slurry which can be easily poured and molded into required shapes. As soon as the mixture becomes dry, it hardens and gives strength to the structure. The standard of the mixture should be appropriate to provide the following to the structure:
Technique Used For the “Concrete Slump” Test
One of the critical tests to analyze the quality of concrete is the “Concrete Slump Test”. This test is conducted to establish the consistency of fresh concrete and to find out its flow. It is also critical in measuring the workability of the concrete and lets you know the composition of the mix.
The reasons why this test is preferred is its simplicity and effectiveness. The use of simple tools to perform the test is also a reason for its popularity. Steps and apparatus used are as follows:
Review Of The Subsided Concrete
The manner or pattern in which the concrete sags is measured and observed and based on it the results are derived. Following are the possible ways and their interpretations:
- True Slump
If the cone crumbles completely, it is termed as Collapsed Slump and indicates that the mix is too wet. In such cases, a fresh sample is taken again and the test is repeated. It also implies that the mixture is of high workability and is not suitable for the test.
These type of concrete usually have workability of >100mm and are used in tight spacing as the concrete needs to flow a long distance.
If the cone’s top crumbles and slips to the sideways, it is termed as Shear Slump. These are typically found to have a workability, which is medium, of 50-90mm and is usually used in reinforced concrete with vibrations.
If the cone just subsides and do not lose the shape, it is termed as True Slump. These are usually of low workability of 10-40mm and are used in foundation work with little reinforcements.
If at all the workability is found to be between 0-25mm, then the concrete is best suited for road construction. And in such cases, the worth of the test cannot be determined and is not taken as valid. You may say that this is the limitation of the test.
These are all about what is concrete slump. We hope that the above article would have helped you in understanding the basics of concrete slump. That said, do let us have your views and experiences. Got any query? Shout out in the comments below.