ROAD PAVEMENTS – BITUMINOUS BOUND MATERIALS Contents

Volume 2 Series NG 900
Notes for Guidance on the Specification for Road Works Road Pavements – Bituminous Bound Materials
NG NG 901 901 901 Bituminous Pavement Mixtures Mixtures
Introduction
Introduction
Introduction
1 The Manual of Contract Documents for Road
Works published by the National Roads
Authority in March 2000 (NRA MCDRW) last
revised Series 900 in May 2005 and is now
revised dated January 2010. This revision shall
be used for all contracts tendered after 1 st
January 2010, but is being published ahead of
that date to enable industry to prepare itself to
be in a position to comply with the new
requirements.
Background
Background
The revisions are due to the implementation of
the new IS EN Standards for bituminous
mixtures and their associated test methods. The
new IS EN standards introduce new names and
designations for bituminous mixtures. The new
IS EN Standards for bituminous mixtures
supersede the previously referenced Irish and
British Standards.
These new Standards are further supported by
a new BS594987 which specifies requirements
for the transport, laying and compaction of
bituminous mixtures.
The NRA has considered the requirements of
the new Standards and chosen to rationalise
them for incorporation into Series 900 of the
Specification for Road Works.. The revised
Series 900 includes additional requirements to
those in the IS EN standards. It also includes
new requirements for the sealing of cold joints
to improve durability.
Some materials are included which are not
covered by EN standards such as Cl 919 Surface
Dressing and CL 924 High Friction Surfaces.
2 The following IS EN Standards for bituminous
mixtures have recently been published as part
of European agreements:
IS EN 13108 Bituminous mixtures – Material
specifications
IS EN 12697 Bituminous mixtures – Test
methods for hot mix asphalt
BS 594987 Asphalt for roads and other paved
areas – Specification for transport, laying,
compaction and type testing protocols has been
published by BSI. This new Standards replace
BS 594, BS 598 and BS 4987.
The new IS EN standards introduce a
significant change to the way bituminous
mixtures are specified, namely, the Evaluation
of Conformity methodology which incorporates
Type Testing and Factory Production Control.
General
General
NSAI has published a guidance document SR 28
Standard recommendations for I.S.EN 13108
series that gives advice on how to specify Irish
standard mixtures using the new European
Standards. Elements of this advice have been
made mandatory for NRA schemes by inclusion
within Series 900 of the Specification for Road
Works.
Following recent research looking at
improvements for durability, revised clauses
have been included relating to the sealing of
cold joints.
3 Current pavement design methods may give the
Contractor a choice of construction materials.
The extent of this choice should be stated in
Appendix 7/1 and the alternative materials
identified by reference to the Specification
Clause numbers. Bituminous mixture
specifications are given in the Specification for
Road Works and the relevant parts of IS EN
13108 with additional guidance on the specific
requirements in Ireland and selection between
options contained in SR28.
4 Requirements included in Appendix 7/1 may
include penetration reference of binder and
aggregate properties such as polished stone
value, aggregate abrasion value, resistance to
fragmentation, resistance to freezing and
thawing, and water absorption as specified in IS
EN 13043.
5 Sub-Clause 2 details the protocols which are
mandatory for production and laying of
bituminous mixtures. The requirement to CE
mark bituminous mixtures means that
documentation validating the properties of
those mixtures and containing information on
their composition will be available. This should
be made available before the start of paving
works and when any source or mix changes are
made. The procedural guidelines for CE
marked bituminous mixtures are outlined in
Table NG 9/1.
6 Except where specifically called for in the
Specification for Road Works (e.g. Clause 942),
the inclusion of polymer modified bitumen in
Appendices 7/1, 7/3 and/or 7/4 is subject to NRA
approval in accordance with NG000.10.
7 The use of natural, recovered unbound and
artificial aggregates is permitted. In this
context, recovered unbound aggregates are
natural aggregates recovered from a previous
use in an unbound form which satisfy the
requirements of Clause 901.
8 The use of IS EN 13043 in Ireland should be
read in conjunction with SR17.
January 2010 1