Crushing concrete coarsely and fine

Often concrete drilling cores are to be evaluated too. Place, time and conditions of the sampling taking are much more precise here. This has very positive effects on mistakes made during sampling. Are the concrete drilling cores too large, they are pre-crushed with a compactor or manually with a lump-hammer. Now the task determines the following course of the sample preparation.

We recommend for the pre-comminution of the concrete the Jaw Crusher PULVERISETTE 1 classic line. The in the photo shown pre-crushed drilling core, was crushed in one step with the jaw crusher down to the possible final fineness.

As a matter of principal, for the eluate, the grain size should be used which corresponds with the additional utilization. Since chunks of concrete like in the photo can not be analyzed though, one has to assume approximately 10 mm for assessments, for other tests analytically fine samples are to be used. According to the commercial waste ordinances, a fineness of below 0,2 mm is to be assumed. Is a material with a grain size of 10 mm needed, in the first run a large amount of material is broken up. The distance of the crushing jaws is therefore adjusted accordingly wide. The for the determination of the eluatable materials required shares are sampled. For the analysis it shall be referred to DIN 38414, part 4 of the so called DEV S4-procedure. The remainder of the material is again processed with the smallest gap width of the jaw crusher. The grains are below 3 mm now.