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HAUC
HAUC

Polished Stone Value (PSV)

S2.6.3
  1. To simplify the determination of the PSV requirements for aggregates in asphalt surface courses, reinstatements in roads are classified into two site categories according to the apparent degree of risk associated with the site location, as follows:

    Site A – Potentially high risk

    Includes:
    1. Traffic signals, pedestrian crossings, railway level crossings – including 50 m approaches
    2. Roundabouts and their exits - including 50 m approaches
    3. Bends < 100 m radius where the speed limit is more than 40 mph (65 km/h) – including 50 m approaches
    4. Downhill gradients over 10% for more than 50 m (single or dual carriageway)
    5. Uphill gradients over 10% for more than 50 m (single carriageway only)

    Site B – Average to low risk

    All other situations on single and dual carriageways, including the following:
    1. Generally straight sections of carriageway
    2. Approaches to and across major/minor road junctions
    3. Bends of 100 m radius or greater, at any speed limit
    4. Downhill/uphill sections of 10% gradient or less
  2. Subject to the requirements of S2.6.1, for all bituminous surface course materials permitted in A2, the PSV of all pre-coated chippings and the coarse aggregate in all mixes used without pre-coated chippings at the running surface must comply with the requirements of Table S2.7. The coarse aggregate in all mixes used with pre-coated chippings at the running surface must have a minimum PSV of 45. The PSV must be tested in accordance with BS EN 1097-8.
    Table S2.7 Bituminous roads – Polished Stone Value

    Road type

    Reinstatement minimum PSV

    Site A Potentially high risk

    Site B Average to low risk

    0

    68

    68

    1

    68

    65

    2

    65

    60

    3

    65

    53

    4

    65

    53
    Note: Limestone coarse aggregate is not normally used in the running surface of roads (PD 6691+A1, 2016); therefore, its use is only permitted by agreement.
  3. Past use of these site categories and Table S2.7 has indicated that the minimum values noted are appropriate in most cases. However, where an authority has alternative requirements for aggregate properties (e.g. part of the DMRB or a published policy), this information must be supplied to the undertaker. Where this is the case the undertaker must specify aggregate properties in accordance with this information subject to S2.6.1 (1).
  4. Where an interim surface course contains an aggregate that may not comply with the requirements of Table S2.7, a surface treatment may become necessary before the reinstatement is made permanent. In this case, the requirements of Table S2.7 are applicable only to the coarse aggregate contained in the surface treatment and not the underlying aggregate in the interim surface course.
  5. Where a high friction coating is to be applied to a reinstatement to match an existing coating, an alternative PSV may be specified, by agreement, in place of the requirements of Table S2.7, depending upon the nature of the site and the period over which the friction coating will be absent.
  6. Where a permanent surface course contains more than one type of aggregate or aggregates from more than one source, all coarse aggregates within the mixture must comply with the PSV requirements of Table S2.7.