New Roads and Street Works Act 1991 Specification for the Reinstatement of Openings in Roads Third Edition (Scotland) January 2015 Approved by the Scottish Ministers under Section 130 of the New Roads and Street Works Act 1991

Appendix A11 - Bitumen Binder Equivalence

A11.1 Introduction

In some road types, particular binder grades are not permitted or are not permitted for machine-lay. In general, hand laying is not recommended where the material is likely to be difficult to compact adequately, especially in cold conditions.

A11.2 Base and Binder Course Materials

Binder grades permitted for Base and Binder Course materials are shown in Table A11.1, provided that the layer thickness is amended to that shown in the table.

Table A11.1 - Permitted Base/Binder Course Binder Grades and Layer Thickness

Material	Bitumen Pen Grade	Combined Base/Binder Course (mm)					Binder Course Only (mm)
		Road Type					Road Type
		0	1	2	3	4	3	4
SMA BC	40/60	305	260	200	120	100	60	60
	70/100	NP	285 H	225	135	105	60	60
	100/150	NP	NP	245	150	110	60	60
20 mm ACBC	40/60	305	260	200	120	100	60	60
	70/100	340 H	285 H	225	135	105	60	60
	100/150	375 H	310 H	245	150	110	60	60
	160/220	NP	NP	NP	NP	155 H	NP	85 H
50/20 or 60/20 HRABC	40/60	350	295	230	150	110	60	60
	70/100	340 H	285 H	255	185	135	75	75
	100/150	NP	NP	275 H	215 H	155 H	85 H	85 H

Notes to Table A11.1:

1) NP = Not Permitted
2) H = Hand-lay only - not recommended for hot weather & not permitted for machine-lay
3) Shaded cells denote the thicknesses for the preferred binder grades noted in Appendix A2 against the binder courses for SMA, AC and HRA.
4) Thicknesses for combined binder and base course for Flexible Roads noted in Appendix A3 generally reflect ACBC material, being the more commonly used material.