Do you know what slump do is concrete? If you've heard of it but don't know what it means and how important it is to perform the concrete slump test on construction sites, this article is for you! We all know that concrete is one of the most used materials in any work and, like any input used during the execution of a construction, it must undergo an analysis to certify the quality of the material.
It is also possible, in larger works, to count on the help of specialized companies to carry out some tests to verify that the material that will be used in the work is good enough to guarantee good quality and durability for the building, that is, if the expected final result will be achieved.
However, it is not always possible and necessary to hire specialized companies to carry out tests during the execution of the work and that is where the importance of the concrete slump test comes in, which is carried out on the construction site by the professionals who are working there themselves. Because it is a fairly simple test, most of the time, it is carried out on the work itself by the workers, without the help of companies. Thus, in most works, the slump test of the concrete is performed to then approve the material (machined or turned on site) before using it.
When carrying out the test, the work now has another guarantee of durability and quality. That's what you want, isn't it? So, to learn more about this very important test that is so used in construction to guarantee the quality of concrete, continue reading this article that I prepared so that you understand everything about this subject!
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First of all, we need to understand the definition of concrete slump, that is, what this very important test consists of. Well, the Slump Test, also called concrete abatement test, is a quick way to define the characteristics of fresh concrete moments before its application, as part of the quality control of the input that will be used in the work.
It must be made both on machined and wheeled concrete on site. The purpose of the slump test is to measure the fluidity of concrete to verify that it has the necessary characteristics for application in a given location. I'll explain it better.
Imagine that you are going to use concrete to make projected concrete. Do you agree that it cannot be very viscous, as it risks it having difficulties getting out of the pump?
It has to be fluid enough to guarantee a good result. If concrete is to be used to fill a column box, concrete must be more fluid for faster and easier filling. Were you able to see the importance of measuring the fluidity of concrete and how it varies depending on the place where it will be applied?
Now I believe you've understood the importance of taking the concrete Slump test, haven't you? So, to better understand how the test should be done, I'm going to explain some important points about the properties of concrete, okay? Let's go!
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Properties of concrete
Contrary to what many people think, the Slump Test does not measure the strength of concrete. To measure the strength of the concrete, the FCK test is performed after 28 days of application, after the curing process is complete. It's very common to say that the Slump Test measures the workability of concrete, but what does that term mean? That is what we are going to clarify in this topic. So, stay here with me!
Tablesability is a very vague term and when we say that the test evaluates the workability of concrete it is a bit comprehensive. But, as I explained in the previous topic, when I made an analogy about the fluidity of the material, I believe it became easier, didn't it? Well, consistency is one of the main factors that influence the workability of the material, but they are not the same thing. So, when we talk about concrete fluidity, it is more coherent to understand what the Slump Test actually assesses.
And to assess whether concrete is good for use or not, it will depend on what purpose it will be intended for. So, do you realize that saying that the Slump Test evaluates the workability of concrete is very vague?
So, for better understanding, consider that the Slump Test evaluates the fluidity of concrete and to approve it, you need to take into account the needs of the place where it will be applied, right?
Why take the slump test?
You may have already understood the Why take the Slump test. However, it is important to emphasize that taking the Slump Test is not only part of the protocol within the execution of a work, but it is also an effective way to guarantee durability and quality for the entire structure. Imagine the big problem you may have if you use concrete that does not have the appropriate characteristics for application in a particular area? The consequences can be serious and can affect the entire structure of the work. That's why it doesn't pay to not take the test.
The Slump Test is so simple, quick and easy to do, that you don't have to do it before using concrete. Thus, it is another guarantee of quality for the work. In addition to Slump, when it comes to concrete quality, it is essential to take the test FCK to measure the strength of concrete, immediately after its heals.
How to do the concrete slump test?
Now, let's get down to practice! Do you want to know the treads How to do the Slump Test? Then come with me, and I'll explain it to you.
The slump test walkthrough is divided into these steps:
Obtain a sufficient amount of concrete sample to perform the test;
Select a flat location so that the test can be performed;
Place on the surface (preferably a watertight place - not on the ground, for example) a trunk-conical mold with the following dimensions: lower diameter of 20 cm, upper diameter of 10 cm and height of 30 cm, with the largest base facing down;
Fill the mold with concrete to a height of 10 cm. Compress with twenty-five strokes on a 16 mm diameter bar. Repeat the procedure for the next two layers;
Wait 5 to 10 seconds and remove the mold slowly;
Place the mold with the smaller base facing the floor;
Now compare the height difference between the mold and the fresh concrete cone trunk, which is the slump, measured in centimeters.
If the test value corresponds to a value within the tolerance limit, concrete can be accepted. The value parameters of the test result vary depending on the place where the concrete was applied.
See how simple it is? Just follow these steps to verify whether or not concrete can be used in your work safely!
Technical Standards that talk about the Slump Test
The procedure for how to perform the Slump test is defined by some technical standards, namely:
NBR NM 67:1998: Concrete — Determination of consistency by abatement of the cone trunk
NBR 10342:2012: Concrete — Loss of abatement — Test method, defining how to measure such loss.
Conclusion
It is still important to note that the Slump Test must be performed both upon receipt of machined concrete frescoes produced by the plant as well as in the concrete that is rotated on site to control the quality of the material. The result of the concrete abatement test must vary depending on the place of its application. Therefore, there is no single certain value for the test result, as it will depend on its purpose.
Today, you learned everything about the Slump Test and saw how quick and easy it is to do it in your work! By carrying out this test, you guarantee more quality and durability for your projects! So don't skip that step, okay? And if you need it, count on Blok for any challenge!
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