CEN standard sand is characterised by its specific particle size distribution. It ranges from 0.08 to 2.00 mm. The grain size distribution is shown in the figure (total sieve residue in % against square aperture in mm) and is given in the table below. Maximum moisture content 0.2%. The sand is supplied in bags of 1350 (± 5) g. According to EN 196-1, mortar prisms for compressive strength testing are made from a mixture of 450 (± 2) g cement, 225 (± 1) g water and one bag of 1350 (± 5) g CEN standard sand.
Specification
• Standard: Paper bag with 36 servings
• Portion pack: 1350 ± 5 g
| Sieve (mm) | Lower limit | Average value of the interval | upper limit |
|---|
| 2.00 | 0 | 0 | 0 |
| 1.60 | 2 | 7 | 12 |
| 1.00 | 28 | 33 | 38 |
| 0.50 | 62 | 67 | 72 |
| 0.16 | 82 | 87 | 92 |
| 0.08 | 98 | 99 | 100 |
Since sand with the particle size distribution required by DIN EN 196-1 does not occur naturally, standard sand must be produced artificially. To do this, natural, quartz-rich sand is sieved in several stages to obtain individual fractions of different grain sizes. The sand fractions are then mixed again in defined ratios. The greatest challenge is the required precision and homogeneity during sieving and subsequent dosing over a very long period of time. As part of quality control, manufacturers of standard sand are therefore obliged to check and document their products at least once a day for compliance with the required particle size distribution (particle size distribution curve). At the same time, monthly compressive strength tests (28-day compressive strength of the mortar) are required. In addition, the responsible certification body carries out an annual inspection.
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