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Consistence tolerance - slump test
Consistence, measured using the slump test (BS EN 12350-2), is either specified as a class or target. Although a supplier will endeavour to provide the required value or range, deviations in production and sampling apply. The following tables give the maximum allowable deviation based on a spot sample taken from the initial discharge of a ready-mixed concrete truck.
|
Class |
Slump range |
Max. allowable deviation on |
| S1 | 10 - 40 | 0 - 60 |
| S2 |
50 - 90 |
30 - 110 |
| S3 | 100 - 150 | 80 - 170 |
| S4 | 160 - 210 | 140 - 230 |
Due to lack of sensitivity of slump test values less than 10mm or greater than 210mm, it recomended to only use the test for slump ≥10mm and ≤
| Target slump (mm) |
Max. allowable deviation on |
| ≤ |
± 30 |
| 50 - 90 |
± 40 |
| ≥ 100 |
± 50 |
Based on BS 8500-1:2015 +A1: 2016
Acknowledgement:
The Concrete Society
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