- A10.2.11
- The producer must design the mixture in accordance with the procedure described here to meet the compressive strength of A10.2.17.
- A10.2.12
- The composition of HBM must be based on mixture design testing carried out using a minimum of 3 binder contents and a minimum of two water contents at each binder content.
- A10.2.13
- The immediate stability at the design water and binder content must be determined using the IBI test in accordance with BS EN 13286-47. The IBI value must be taken as the average of a set of 3 test specimen results.
- A10.2.14
- The effect of immersion in water on compressive strength must be assessed in accordance with BS 1924-2 as follows:
- y1 and y2 = 20°C for mixtures containing cement or 40°C for mixtures not containing cement
- RRc must be ≥80
- On completion of the immersion stage (y2) the test specimens must show no signs of cracking or swelling
- A10.2.15
- Strength is taken as the average of at least 3 specimens. The mean of the test results must be greater than the specified strength (C1.5/2 or C3/4) and no individual result can fall below 67% of the strength requirement class. In addition, the mean of the test results must not exceed C9/12.
- A10.2.16
- HBM must be non-frost susceptible. Material is classed as non-frost-susceptible if:
- the compressive strength class is C3/4 minimum, or
- the mean heave is 15 mm or less, when tested in accordance with BS 812-124, with the sample preparation in accordance with BS 1924-2.
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