Mineral concrete, ideal grading lines

Mineral concrete is not mineral concrete. Grain and rock have a significant impact on the properties of the mineral concrete layer. What grading curves are, and how they are optimized, is discussed in detail in this article.


Mineral concrete consists, as well as clay or ordinary soil, of different sized grains. In mineral concrete, the grain is called. In the normal case, the granularity of the mineral concrete is given in accordance with the largest and smallest grains. A grain size of 2/45, for example, states that the smallest grains in the mineral concrete mix are 2 mm, but the largest are 45 mm.

For the practice, this is already helpful, because you can already orient themselves to micro and largest grain well. But in some cases that is not enough - it is also about all grains, which are of their size between the smallest and largest grain.

Does a mineral concrete generally contain more large or smaller grains? How are the grain sizes distributed? A mineral concrete 2/45 could theoretically have 10 grains of 45 mm and 10,000 grains of 2 mm size. Or the other way around. In both cases, this would be a completely different grain structure.

To make such connections visible, so-called Siebliniendiagramme be created. They contain, in logarithmic representation, the existing grain sizes and the respective proportion of grains of this size. So you can graphically view the distribution of grain sizes and estimate what structure the mineral concrete has.

Read diagrams correctly

For the wire-line diagrams, you will find the individual particle sizes and their frequency (in percent) within the grain mixture. So you can see at a glance, which grain sizes are most common in the mixture, and which are less common.

When reading, make sure that the representation is logarithmic - so you need to read the values ​​and you can not simply take them linearly from the graphs. If you hold an English-language form in your hand, you must read it exactly in the wrong direction: the horizontal and vertical axes are reversed there.

The ideal sieve line, or the so-called Fuller parabola, represents the ideal distribution of grain sizes in a mixture. It is the mixture with the smallest possible voids. The closer the grain distribution of the ideal sieve line comes, the better the mixture.

Video Board: Measuring 100ml of water to for Grey Matter Concrete Marbling