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HAUC
HAUC

Surface course mixtures

A2.1.4
The following preferred HRA surface course mixture options may be replaced by any of the permitted mixtures.
A2.1.5
Chippings for surface application to HRA surface course mixtures must be coarse aggregate conforming to PD 6691 appendix C, C.2.3 and meet the requirements of C.2.8. The size and grading of chippings must be 14/20 as in Table C.5. Where the existing surface has 8/14 chippings, these may be used in the reinstatement. Where pre-coated chippings are to be embedded into a road surface, they must be spread to give a chipping density as per BS 594987 or reasonably matching that of the existing surface notwithstanding the requirements for surface texture specified in S2.6.
A2.1.6

Roads Type 0 and 1

  1. The preferred surface course mixture is HRA 35/14 F surf PMB with the wheel tracking requirements meeting classifications 2 for road Type 0 and classification 1 or 2 for road Type 1. The wheel tracking classification 2 for road Type 1, should be selected for heavily stressed areas such as bus lanes, roundabouts and approaches to pedestrian crossings and traffic lights. The approach areas are considered as the 50 m before the traffic light or pedestrian crossing. These areas may be extended depending on the likelihood of traffic having to brake unexpectedly.
  2. Alternative permitted mixtures are:
    1. HRA 30/14 F surf PMB des
    2. HRA 35/14 F surf 40/60 des
    3. HRA 30/14 C surf 40/60 des (before use refer to A2.1.3)

    all with the wheel tracking requirements meeting classification 2 for road Type 0 and classification 1 or 2 for road Type 1. The wheel tracking classification 2 for road Type 1 should be selected for heavily stressed areas such as bus lanes, roundabouts and approaches to pedestrian crossings and traffic lights.
A2.1.7

Roads Type 2

  1. The preferred surface course mixture is HRA 35/14 F surf 40/60 des.
  2. Alternative permitted mixtures are:
    1. HRA 30/14 F surf 40/60 rec
    2. HRA 30/14 F surf 40/60 des
    3. HRA 30/14 C surf 40/60 des (before use refer to A2.1.3)
    4. HRA 35/14 surf 40/60 rec
A2.1.8

Roads Type 3 and 4

  1. The preferred surface course mixture is HRA 35/14 F surf 40/60 des.
  2. Alternative permitted mixtures are:
    1. HRA 30/14 F surf 40/60 des
    2. HRA 30/14 C surf 40/60 des (before use refer to A2.1.3)
    3. HRA 30/10 or 30/14 F surf 40/60 rec
    4. HRA 55/14 F surf 40/60 or 100/150 des
    5. HRA 55/10 F surf 40/60 or 100/150 des

    When a, b or c are used as the binder course in narrow trenches or small excavations, they must have wheel tracking requirements meeting classification 2.
A2.1.9

Footways, footpaths and cycle tracks

  1. The preferred HRA surface course mixture is HRA 15/10F surf 100/150 rec.
  2. HRA 30/10F surf 70/100 or 100/150 or 40/60 rec is an alternative permitted mixture.
  3. Areas that exhibit signs of regular trafficking by commercial vehicles or such sites notified to the undertaker by the authority must be reinstated in accordance with S8.7.