CONTENT Why Revise? EN13108 Terminology Main changes Implementation issues Summary Credit to Bill Greene (NRA) and Alex Lake (FM) 2

Transcription

1 Manual of Contract Documents for Road Works. Revised Series 900. January

2 CONTENT Why Revise? EN13108 Terminology Main changes Implementation issues Summary Credit to Bill Greene (NRA) and Alex Lake (FM) 2

3 Why Revise? 3

4 Why Revise? Update to incorporate new IS EN references principally: IS EN Bitumen and Bituminous Binders. IS EN (Parts 1-47) Bituminous Mixtures Test Methods. IS EN Aggregates for Asphalt Production (see also SR17). IS EN (Parts 1-8) Bituminous Mixtures (see also SR28). SR 28 the Irish National Guidance Document (NCCI) for IS EN Revised UK 900 series Withdrawal of British Standards (replaced by BS ) BS 594 Hot Rolled Asphalt Spec. BS 4987 Macadam (Asphalt Concrete) Spec. BS 598 Suite of Test Methods. 4

5 Why Revise? BS Combination of BS594: Part 2 and BS 4987:Part 2 both of which are withdrawn Includes details on Min and max compacted thicknesses Accuracy of finish Compaction Delivery and rolling temperatures Rates of spread Type testing protocols 5

6 Why Revise? IS EN a Family of Product standards: d IS EN Asphalt Concrete (replaces BS 4987) IS EN Asphalt Concrete for Very Thin layers (replaces proprietary mixes) IS EN Soft Asphalt (Nordic Countries) IS EN Hot Rolled Asphalt (replaces BS 594) IS EN Stone Mastic Asphalt IS EN Mastic Asphalt IS EN Porous Asphalt IS EN Reclaimed 8 Reclaimed Asphalt (constituent materials, not mixes) 6

7 Why Revise? Plus Conformity Standards: IS EN Type Testing IS EN Factory production Control 7

8 Why Revise? Plus Product testing Standards: IS EN Parts Standards covering the testing of asphalt mixes 8

9 EN Terminology 9

10 EN13108 Terminology EN13108 applies two approaches: Empirical Approach Specifies material based on: - composition alone or - composition + performance related tests (performance related tests which indirectly measure performance, air voids, water sensitivity, Marshall stability, flow etc) Fundamental Approach Specifies material based on performance based tests, with limited requirements for composition (929 Design Mix and 930 EME2) (performance based tests which directly measure performance such as stiffness, deformation resistance (tri-axial) & fatigue) 10

11 Performance related tests Wheel tracker Gyratory compaction Marshall test t Indirect tensile test 11

12 EN13108 Terminology Mandatory text Product Description Asphalt Type AC BBTM HRA SMA PA Size D etc Course Type SURF BIN BASE Binder Grade 30/45 40/60 70/ / /220 12

13 EN13108 Terminology Additional Text for Irish descriptions Grading Type DENSE CLOSE MED/OPEN Designed Mixtures DES Miscellaneous PSV / REG 13

14 Product identification Mixture designation: Material type Aggregate size Grading type Surf/bin/base Binder grade/type Recipe/Design/Perf AC 20 dense bin 70/100 recipe is Asphalt Concrete/ 20mm/dense/ binder course/ pen/ recipe mix. A recipe 20 mm dense binder course asphalt concrete with 100 pen binder 14

15 EN13108 Terminology Change in Nomenclature -Product Description Examples Current 2009 BS 4987 Mixes 0/32 DBM 50 Base (Roadbase) 0/20 DBM 100 Binder course 0/32 HDM 50 Binder Course 0/10 Open Graded SC 200 0/14 Thin Surface Course BS 594 Mixes 30% 0/14 HRA SC 50 35% 0/14 HRA SC 50 35% 0/14 HRA SC Des 50 IS EN &5 AC 32 Dense base 40/60 rec AC 20 Dense bin 70/100 rec AC 32 HDM bin 40/60 rec AC 10 open surf 160/220 rec SMA 14 surf PMB 65/ (PSV 60) des IS EN HRA 30/14 F surf 40/60 rec HRA 35/14 F surf 40/60 rec HRA 35/14 F surf 40/60 des 15

16 Main Changes 16

17 Series 900 Changes: Main Changes ISO 9001 or equivalent accreditation required. Introduction of EME2,, absorb HDM, DBM & DBM50 into one clause. Align the Specification with SR 28 with the inclusion of target composition tables and Irish specific specification clauses. Include SR 28 specification examples in MCDRW Vol 2 Notes for Guidance. Provide options for performance related design mixtures -Cl 943 Evaluation of Conformity Provide a market to encourage industry to adopt factory production control practices and type testing. 17

18 Main Changes Encourage material recycling Max 50% reclaimed asphalt permitted in Base & Binder mixes Update to incorporate new IS EN references on products, testing and factory production controls, including SR17 and SR28 Incorporation of Transportation, Laying & compaction advice from BS Type Testing Protocols PRD compaction assessment replaced by Indirect Density Gauge and air void measurement - BS methods. Treatment t of Joints / Pavement edges Base & Binder sealant applied to top surface of all joints 75mm each side Kg/m 2 residual bitumen 18

19 Main Changes Update materials to include new nomenclature. Polymer Modified Stone Mastic Asphalt (PMSMA) Clause 942 previously Thin Surface Course system Skid resistance requirements as per all surfacing materials. No specific initial values. 19

20 Series Clause Origins: i Main Changes Current NRA Specification May 2005 New MCDHW Series 900 published in August 2008 New MCDRW Series 900 to reflect SR28 and latest IS-EN standards and importantly industry capability UK Industry has been moving towards performance related specification, factory production control (through sector schemes), product accreditation (through HAPAS) and self certification cat New MCDRW 900 Series is a blend of old and new 20

21 Main Changes Series Clause Origins: Broadly the UK Series 900 has been adopted except the following NRA clauses have been maintained: 902 Reclaimed Asphalt 909 Dense Asphalt Concrete Surface Course 912 Close Graded Asphalt Concrete Surface Course 915 Coated Chippings for HRA 918 Slurry Surfacing 919 Surface Dressing 921 Surface Macrotexture 924 High Friction Surfaces 938 Porous Asphalt 940 Relative Hydraulic Conductivity Test 942 Stone Mastic Asphalt Surface Course 21

22 Series New Clauses Main Changes 903 Placing & Compaction of Bituminous Materials see also BS Dense Asphalt Concrete Base & Binder now combined 923 Binder Recovery using the Rapid Recovery Test (RRT) and Accelerated Ageing using the Modified Ageing Rolling Thin Film Oven Test (RTFOT) EME Determination of the Complex Shear (Stiffness) Modulus and Phase Angle of Bituminous Binders using a Dynamic Shear Rheometer (DSR) EME Dense Base and Binder Course Asphalt Concrete (Design Mixtures) 22

23 Series New Clauses: Main Changes 930 EME2 Base and Binder Course Asphalt Concrete 937 SMA Regulating Course Included to allow thinner regulation than was possible with current materials. 943 HRA Surface and Binder Course (Performance related design mixtures) Deformation resistance/wheel tracker (small device) 945 Weather Conditions for Laying of Bituminous Mixtures 23

24 Main Changes Series Omitted Clauses 930 HDM Base now in clause 906 (Cl 930 now EME) 931 Use of Rubber in Bituminous Materials 932 DBM50 Base now in clause HDM Binder Course now in clause DBM50 Binder Course now in clause Binder Drainage Test Included in Clause 938 as reference to IS EN

25 Main Changes Compaction Control Procedures AC Base & Binder Course & Cl 929 materials Indirect Density 20 metre intervals Wheel Tracks Mean of six readings shall not exceed 7% Air Voids Pair Cores every 1000Metres BS Cl Wheel Tracks - Category V max 7 Pair Cores every 250 Metres BS Cl centred100mm from joint position (unsupported edge) Category V max 9 25

26 Main Changes Deformation Resistance Designed Base/Binder Courses Mixtures Cl 929. SMA Regulating Course Cl 937. SMA Surface Course Cl 942. HRA (performance related design)cl 943. Wheel tracking tests carried out to IS EN (small device) method and BS for 24 months to assess and review methods. 26

27 Main Changes EME 2 Enrobé á Module Élevé French High Modulus Base type mix. Small aggregates, Hard binder grade, High binder content. Detailed mix design requirements set out in Clause 930 SRW Tightly controlled Binder properties - IS EN plus additional specified requirements Cl 930. Protocol for trial strips for type testing as outlined in Annex E BS Minimum ITSM 5500mpa. 27

28 Main Changes EME 2 Enrobé á Module Élevé Requirements for in situ compaction control, i.e. void content, as specified in Clause 930. Cores every 1000 metres Max air void 6% Deformation resistance Large Wheel Tracking device Category P 7,5. Dual testing small & large device for 24 months to establish correlation. Compaction temperature C min at Paver & 110 C min rolling temp. 28

29 Implementation Issues 29

30 Limits i for target grading : Implementation Issues Fundamental difference between specifying using the European Standards d and dth the method currently covered di in NRA and dbs specifications and standards. Revised 900 series outlines Target Grading envelope only. Conformity specification acquired from NRA Notes for Guidance (MCDRW Vol.2) and declared grading as provided by manufacturer Type Testing Report. 30

31 Implementation Issues Current Series 900 Composition Table 31

32 Implementation Issues EN only sets limits for target grading Sieve 32mm Asphalt Concrete Use SR 28 for guidance for declared specification 1.4D 40mm 100 D 31,5mm ,063mm 0,063mm

33 Implementation Issues Plus conformity tolerances I.S. EN

34 Implementation Issues Clause 906 Dense Base and Binder Course Asphalt Concrete with Paving Grade Bitumen (Recipe Mixtures) Example AC 32 Dense Base 70/100 i.e. 32mm Asphalt Concrete. Unique to single product from single manufacturer 34

35 Table 9/3 Target limits for composition AC 32 Base & Binder Course & AC 20 Binder course- recipe mixtures Previous BS Nomenclature 32mm base 32mm Binder course 20mm Binder course New EN AC 32 DBM/HDM AC 32 DBM/HDM bin AC 20 DBM bin Nomenclature base Test sieves aperture size (mm) % by mass passing % by mass passing % by mass passing , ,063 DBM ,063 HDM Binder Content

36 Implementation Issues Example of a declared specification Table NG 9/2 Unique to single product from single manufacturer AC 32 DBM Base 40/60 Sieve Designation Test Target Supplier Tolerances from Conformity Sieve Composition declared target Table A.1 Specification SR 28 Section 4 grading / binder IS EN ,4D D 31, Characteristic Coarse sieve Optional Extra coarse sieve ± , ±9 N/A 2mm ± Characteristic Fine sieve 0, ± ,063mm 0, ±3 3-9 Binder B act (limestone) ,0 ±

37 Implementation Issues Specific Implementation Issues: Culture Change Why? BS Standards left compliance as part of the contract. EN Standards bring compliance and conformity in to the standard. Compliance testing Factory Production Control Ensuring that a mix formulation which has previously been type tested is produced consistently Plant sampling v Site sampling (Frequency and status) etc. Evaluation of Conformity Auditing systems (critical) Type Testing & FPC. CE Marking 37

38 Implementation Issues How can I trust self certification? See Handout of Table NG 900/1 38

39 Summary 39

40 Summary Revised Series 900 will be published in October 2009, dated Jan 2010 and to take effect for contracts placed thereafter. Series 900 (SRW Vol1) must be read in conjunction with Notes for Guidance to Series 900 (Vol2) contains SR 28 specification examples and advice. Majority of the bituminous mixes as supplied will not change with regard to composition Need to ensure that staff at all levels (LA s, Consultants, Specifiers and Clients) are trained/aware of the significant changes in the methodology which now applies to the interpretation of the Series

41 Summary Degree of flexibility will be required in the early stages of implementation. AND FINALLY Current Series 900 has 44 pages and can be viewed, nearly,, as a stand alone document Revised Series 900 has 90 pages and Notes for Guidance has 46 pages and may also require reference to the suite of individual product standards in IS EN

42 Summary BS 594 MIX IS EN MIX 42