As machinists concrete mixers coffin

Everything is ready for acceptance of the concrete mixer arrives, expanded and started... That's just to distant parts of the formwork mixture dotekaet and shovel it to reach. What is the standard version? That's right: let's add water, concrete becomes thinner and dotechet. Only you can forget about the grade strength in this approach.

We paid for concrete M400, and M300 have received. We dreamed of a safe monolith and got cracks in thick finger. And all this is the result of "pampering" of water.

A bit of theory

Deep in the methodology for calculating the composition of the concrete will not intermeddle. It is long, tedious and difficult. I'll tell you in a simple way, so that students can understand.

Cornerstone - water-cement ratio. It directly affects the strength of the concrete. If greatly simplify, we can say that the mixing unit weight of cement, always need a certain amount of water.

When more water than necessary, it is not fully involved in the hydration of the cement. After hardening pores are formed, which indirectly reduces the strength of the concrete.

If less water than necessary, enters the reaction is not all cement. This means that the concrete is gaining strength, which might be a sufficient amount of water.

The volume of water is so important that the calculation take into account the composition of the RBU on literally every drop of it. Included in the calculation of aggregates even humidity. When using wet sand and gravel, the formulation is administered less water.

"Liquid" concrete without loss of strength

Himself to do such tricks on site useless. In RBU to increase the mobility of the injected more water and compensate additional cement. Preserved grade of concrete, thus it becomes more "liquid".

Another way to increase the mobility - chemical supplements. But that's another story.

And now to the practice

On pouring concrete is always ordered with the mobility of P4 or P5. It is well spread between the fitting and allows more time for styling.

Preparation for acceptance - is another story. Always keep handy a couple of spare shovel, trowel, trowel, etc. "At the shovel" to stretch the mixture is always at least two people. Another on the vibrator. And one to level the surface. That you would not speak, every minute counts. He missed and you can go for scrap.

When booking a concrete warning that we need invoices. Only it is possible to check which brand mix released the driver with RBU. With the bill we know that liquid concrete - is the mobility of the P5, and not just the water that the driver is more than filled the drum on the road to the site.

And most importantly, there is no water in the concrete at the site! Work quickly. Then the mixture will not have to be thinned. You successful acceptance and durable designs! Thank you for reading! And if there was any use to you, subscription and Like.