ROAD PPPPAVEMENTS –––– BBBBITUMINOUS B …

1 Volume 2 series NG 900 Notes for Guidance on the specification for road Works road Pavements Bituminous Bound Materials January 2010 RRRROAD OAD OAD OAD PPPPAVEMENTS AVEMENTS AVEMENTS AVEMENTS BBBBITUMINOUS ITUMINOUS ITUMINOUS ITUMINOUS BBBBOUND OUND OUND OUND MMMMATERIALSATERIALSATERIALSATERIALS Contents Clause Clause Clause Clause TitleTitleTitleTitle Page Page Page Page NG 901 Bituminous Pavement Mixtures .. 1 NG 902 Reclaimed Bituminous Materials.

2 5 NG 903 Placing and Compaction of Bituminous Mixtures .. 5 NG 906 Dense Base and Binder Course Asphalt Concrete with Paving Grade Bitumen (Recipe Mixtures) .. 6 NG 910 Hot Rolled Asphalt Surface Course (Recipe Mixture) .. 10 NG 911 Hot Rolled Asphalt Surface Course (Design Mixture) .. 11 NG 912 Close Graded Asphalt Concrete Surface Course .. 13 NG 915 Coated Chippings for Application to Hot Rolled Asphalt Surfaces .. 14 NG 916 Open Graded Asphalt Concrete Surface Course .. 14 NG 917 Cold Milling (Planing) of Bituminous Bound Flexible Pavement.

3 14 NG 918 Slurry Sealing .. 14 NG 919 Surface Dressing: Recipe specification .. 15 NG 920 Bond Coats, Tack Coats and Other Bituminous Surface Courses .. 16 NG 921 Surface Macrotexture of Bituminous Surface 17 NG 923 Binder Reclaimed using the Rapid Recovery Test (RRT) and Accelerated Ageing using the Modified Ageing Rolling Thin Film Oven Test (RTFOT) .. 17 NG 924 High Friction Surfaces .. 21 NG 925 Testing of Bituminous Mixtures .. 22 NG 928 Determination of the Complex Shear (Stiffness) Modulus (G*) and Phase angle ( ) of Bituminous Binders Using a Dynamic Shear Rheometer (DSR).

4 22 NG 929 Dense Base and Binder Course Asphalt Concrete (Design Mixtures) .. 24 NG 930 EME2 Base and Binder Course Asphalt Concrete (Design Mixtures) .. 28 NG 937 Stone Mastic Asphalt (SMA) Regulating Course .. 28 NG 938 Porous Asphalt Surface Course .. 29 NG 942 Polymer Modified Stone Mastic Asphalt Surface Course .. 30 NG 943 Hot Rolled Asphalt Surface Course and Binder Course (Performance-Related Design Mixtures) .. 31 NG 945 Weather Conditions for Laying Bituminous Mixtures .. 32 Volume 2 series NG 900 Notes for Guidance on the specification for road Works road Pavements Bituminous Bound Materials January 2010 1111 NG 901NG 901NG 901NG 901 Bituminous Pavement MixturesBituminous Pavement MixturesBituminous Pavement MixturesBituminous Pavement Mixtures Introduction Introduction Introduction Introduction 1111 The Manual of Contract Documents for road Works published by the National Roads Authority in March 2000 (NRA MCDRW)

5 Last revised series 900 in May 2005 and is now revised dated January 2010. This revision shall be used for all contracts tendered after 1st 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. 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.

6 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 The revised series 900 includes additional requirements to those in the IS EN standards.

7 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. BackgroundBackgroundBackgroundBackground 2222 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.

8 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. NSAI has published a guidance document SR 28 Standard recommendations for 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.

9 Following recent research looking at improvements for durability, revised clauses have been included relating to the sealing of cold joints. GeneralGeneralGeneralGeneral 3333 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.

10 4444 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. 5555 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.