New Tools from EN Standards for high performances mixes

Transcription

1 New Tools from EN Standards for high performances mixes Evolution of EN standards Towards Performances What about Binders Performances and cold Climate Ex Denmark Ex Canada Ideas for Poland Krakow March 7th 2018 X. CARBONNEAU

2 Evolution of EN Standards Revision of EN PRODUCTS & TYPE TESTING & FPC EC mandate : Avoid barriers to trade Moving to performances Additional test : durability & ageing & Cold mixes appears

3 Evolution of EN Standards 44 Cracking 45 Saturation Ageing Tensile Stiffness 46 Low temp. 49 Skid resistance New tests = Investment Training / Practice Lab results Sites survey! Mid term relevant characteristics for contracts 50 Scuffing (TS) 52 Ageing (TS)

4 What about binders Evolution of standards on binders More characteristics than before Pen and R&B not sufficient + Some rheology to better qualify binders Temperature susceptibility And rutting behaviour (MSCR) for PmB

5 What about binders

6 What about Binders Binder grade Range of modulus 10/ / /30 27/ 80 (106!) 35/50 20/49 50/ Variation between suppliers for the same grade 20/30 in Central Europe 20/30 15/25 10/ /70 35/50 G* binder

7 What about Binders Usual characteristics not sufficient Need of better tools - To anticipate AC Mixes characteristics - Easy to do & relevant Rheology Equipment available Easy to practise Quite good reproducibility Helpful to garanty AC performances

8 What about Binders EN DRAFT Annex C PROPERTY Low temperature behaviour after long term ageing a Addressing temperature sensitivity: G* and 1,59 Hz (10 rad s -1 ) after short term ageing a Temperature at which S = 300 MPa Temperature at which m=0.3 TEST METHOD EN EN EN (BBR) UNIT 8 mm plate Temperature T 1 for C G* = 5 MPa b Value of δ at T EN EN (DSR) 25 mm plate Temperature T 2 for C G* = 50 kpa b Value of δ at T 2 VALUE C RV C RV Note a The applicable properties shall be provided for bitumen grades appearing in Table 1A; long term ageing includes RTFOT + PAV conditioning. b The temperatures T1 and T2 have to be determined by interpolation from two temperatures, one below and one above the targeted temperature. RV RV RV RV

9 What about Binders Predict AC mix thermomechanical behavior2s2p1d Model MSCR for rutting : Don t forget Aggregates! Low temperature behaviour DSR 4 mm. Possible prediction / research still needed..

10 Performances and Cold Climate DENMARK ADAPT MIX DESIGN TO AVAILABLE MATERIALS SELECT THE RIGH BINDER SMA 35 mm ABB 60mm GAB II 140mm SMA 35mm ABB 60mm HMA GAB II 115 mm Roadbase course 200 mm untreated aggregates MECHANICAL CHARACTERIZATION FIRST TRIAL SECTION 2004 Capping layer 360 mm of sand DEVELOPMENT

11 Performances and Cold Climate CANADA MECHANICAL PERFORMANCES Characteristics Requirements Rutting LC Water resistance AASHTO T Bitumen content (%) TSRST LC 26_006 3,75 AASHTO TP C Binder grade PG Fatigue resistance TC-CY C 10Hz 106 cycles Complex modulus TC CY 10 C 10Hz TC CY 15 C 10Hz 11000

12 Performances and Cold Climate CANADA MECHANICAL PERFORMANCES

13 Back to Poland SELECT RIGHT BINDER 20/30 ADAPT COMPOSITION : AC 16 / TL 5% / ENOUGHT MECHANICAL IMPROVMENT TO BE RELEVANT IN PAVEMENT DESIGN

14 Back to Poland Improvment of Mechanical characteristics Higher stiffness higher fatigue Reduce thickness French Experience No limits with Cold climate

15 Back to Poland Expected range of Stiffness for Polish AC Mixes According to available binders on the market AC WMS ~ BC with 20/30 Too stiff?

16 Back to Poland Possible Issues with recent jobsite Important survey of the Network Better knowledge of climatic conditions

17 Mecanichal Performances For Pavement design Still prevent Rutting Low temperature behaviour No cracking Requirements «Design» adapted PmB binder

18 To conclude We are going towards Performances Project will define the right ones : With relevant requirements New tools available To better anticipate AC mix characteristics To improve behaviour To take into account all needs To guide AC producer to the good solution (Technical economical) And now to include durability