5.2. Operating Principles of Internal Vibrators

So, for that that lubricating process is needed. So, what we do is basically before pumping of your actual the concrete batch. So, what you do is, you just prepare mortar grout and flush the pump and the pipeline with the mortar grout. So, flush it with the mortar grout that is what is called as lubricating process. So, once a lubricating process is done, then you can do the actual pumping of your concrete mix.

Before you start pumping concrete, it's crucial to perform a lubrication process. This involves preparing a mortar grout mixture and flushing it through the pump and the pipelines. This initial step helps lubricate the system, ensuring smooth operation when concrete is pumped through. It's similar to how oil lubricates the engine of a car, reducing friction and making the movement smoother.

Think of this lubrication step like preparing a playground slide for kids. Before they slide down, you might pour a little water on the slide to make it slippery. This ensures they slide down smoothly without any stopping or friction.

So, after the concrete pumping is done, so, immediately you have to clean the pump and the pipelines. Otherwise, if the concrete hardens, it is very difficult to clean it. So, further, very commonly, you can see that they will insert a rubber plug into the pipeline and flush it along the pipeline with the water pressure. So, this rubber plug will clear away everything perfectly so that there will not be any choking of any aggregate or anything in the concrete pipelines.

Once the concrete is pumped, it’s essential to clean the pump and the pipelines right away. If the concrete hardens inside, cleaning becomes extremely tough. To prevent blockages, a rubber plug is introduced into the pipeline and flushed with water pressure to clear out any residual concrete, ensuring the pipelines remain clear for future use.

Imagine trying to clean out a toothpaste tube after the toothpaste has dried inside. It would be frustrating and time-consuming. That's why we clean the pump and pipelines immediately after use, just like rinsing a toothpaste tube right after brushing.

So, this is the device they use as a check to ensure that there is no choking or blocking in the pipeline. So, that is why I told you, so, every time when you do this pumping operation, before pumping, I have to do the lubricating process and immediately after the pumping, I have to do the cleaning process. So, if we need the concrete if we need a steady supply of concrete, in that case, pumping will be easier.

Using the lubricating and cleaning processes ensures that pumping operates smoothly without blockages. For consistent construction needs, having a steady supply of concrete is vital, and pumping provides an efficient means to achieve this, minimizing delays associated with manual placement methods.

Imagine a restaurant that needs to continuously serve food to its customers. If the kitchen is well organized and cleaned after each meal, it will function smoothly and be able to serve meals efficiently. Similarly, keeping the pump and pipelines clean and lubricated allows for a steady flow of concrete to the construction site.

So, there are some guidelines for proper pumping or successful pumping. That we should always keep in mind. So, basically if you decide that you are going to go for pumping method for the concrete placement that decision has to be made even during the mix design itself.

Choosing to use pumping for concrete placement should be considered during the mix design phase. The parameters of the concrete mix, such as the maximum size of aggregates and the amount of fines, will significantly impact its pumpability. For instance, aggregates should not exceed a certain size to prevent blockages in the pipeline.

Think of this like deciding the right size of ingredients when baking a cake. If you use chunks that are too large in a recipe that calls for finely chopped elements, the cake might not bake properly. Hence, it is critical to design your concrete mix with the pumping method in mind.

So, the maximum size of aggregate (MSA) is very important for pumpable concrete. So, we should not go beyond 20 to 25 mm. So, there is a simple guideline like pipe diameter should be at least 3 times the MSA of your aggregate.

The maximum size of aggregate (MSA) is a crucial factor in ensuring that concrete remains pumpable. To prevent blockages, aggregates should be limited in size (typically no larger than 20-25 mm), and the diameter of the pipeline should be at least three times greater than the MSA. This ensures that the concrete can flow freely without obstruction.

Consider trying to fit various sized balls through a tube. If the balls are too big compared to the tube’s diameter, they’ll get stuck. Just like that, smaller aggregates ensure smoother flow through the pipes when pumping concrete.

--