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 .. 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.

2 14 NG 917 Cold Milling (Planing) of bituminous Bound Flexible Pavement .. 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) .. 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.

3 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) 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.

4 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 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. 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.

5 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. 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.

6 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. 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. 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.

7 6666 Except where specifically called for in the Specification for road Works ( 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 7777 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. 8888 The use of IS EN 13043 in Ireland should be read in conjunction with SR17. Volume 2 Series NG 900 Notes for Guidance on the Specification for road Works road Pavements bituminous Bound Materials January 2010 2222 Resistance to Fragmentation (Hardness)Resistance to Fragmentation (Hardness)Resistance to Fragmentation (Hardness)Resistance to Fragmentation (Hardness) 9999 Regional knowledge may indicate that particular aggregates with higher levels of Los Angeles coefficient can be accepted, where these aggregates have given satisfactory service.

8 It is expected that aggregates with a higher coefficient than that specified could be acceptable, provided the cleanness and durability criteria are satisfactory. Resistance to Freezing and TResistance to Freezing and TResistance to Freezing and TResistance to Freezing and Thawing (durability)hawing (durability)hawing (durability)hawing (durability) 10101010 The soundness value test should initially be used for source approval of aggregates, and thereafter only in cases where their durability is suspect. Where local experience indicates that an aggregate with a lower soundness value than that specified may be suitable, details of the aggregate and the appropriate soundness value should be inserted in Appendix 7/1. The soundness value test is not intended as a mandatory test for known durable aggregates. The water absorption test can be used as a routine check test of such aggregates. When required, details of the tests should be scheduled in Appendix 1/5.

9 11111111 A water absorption value of 2% or less for coarse aggregates is considered to indicate a satisfactory aggregate source. (This value may be exceeded by fine aggregates). When absorption values of coarse aggregates exceed the recommended WA242, magnesium sulfate soundness tests should be carried out for compliance purposes. IS EN 13043 indicates that the water absorption test is not applicable for blast furnace slag aggregates. Blast furnace slag aggregates with absorption values up to 8% have been shown to have acceptable soundness. Therefore, the durability of blast furnace slag aggregates should be determined by periodic measurement of soundness. CleannessCleannessCleannessCleanness 12121212 There is no current test procedure for cleanness other than the requirement for aggregates to meet the specified IS EN 13108 requirements for the fraction passing the mm sieve. Provided the aggregates meet requirements for particle size distribution, based on the washing and sieving techniques of IS EN 933-1, it is considered the cleanness aspect of the aggregates will be acceptable.

10 However, the coarse aggregates should be checked to ensure they are not coated with clay or silt after having gone through the drying plant and before being coated with bitumen. Resistance to Polishing and Surface AResistance to Polishing and Surface AResistance to Polishing and Surface AResistance to Polishing and Surface Abrasionbrasionbrasionbrasion 13131313 The Design Manual for Roads and Bridges and NRA addendum to HD 36 gives guidance on aggregate properties for new bituminous surfacing. Volume 2 Series NG 900 Notes for Guidance on the Specification for road Works road Pavements bituminous Bound Materials January 2010 3333 Table NG 9/1:Table NG 9/1:Table NG 9/1:Table NG 9/1: Procedural Guidelines for CE Marked bituminous Mixtures to EN 13108 Procedural Guidelines for CE Marked bituminous Mixtures to EN 13108 Procedural Guidelines for CE Marked bituminous Mixtures to EN 13108 Procedural Guidelines for CE Marked bituminous Mixtures to EN 13108 Employer s Representative s Employer s Representative s Employer s Representative s Employer s Representative s ChecklistChecklistChecklistChecklist Limits and ControlsLimits and ControlsLimits and ControlsLimits and Controls Type Tests relate to specific compositions.