Improvements regarding rolling resistance. Bjarne Schmidt, Danish Road Directorate

Transcription

1 Improvements regarding rolling resistance Bjarne Schmidt, Danish Road Directorate

2 Pavement condition and quality Measurement methods and data Impact on environment and society InnoEnergi DRD DURAPAV-NordFoU Governmental green fund MIRIAM Pooled fund MIRAVEC ERA-NET COOEE DK research fund COOEE+ VD ROSE DK Innovation fund ROSANNE EU Traffic safety Comfort Durability Models Effect Energy CO 2 Implementation Construction and maintenance 2.

3 Effect, Potential and Challenges CO 2 reduction at a good price Socioeconomic considerations shows that reducing rolling resistance from road pavements is competitive to other means of reducing CO 2 emissions. Less tire/road noise On all test sections noise has been measured and these measurements shows that that pavements with low rolling resistance also has a positive effect on noise. Compared to traditional used pavements on the state roads in Denmark. Defined asphalt type in 2017 for commercial use in 2018 I different mix-designs, based on SMA 6 and SMA8 has been tested on accelerated conditions. The results shows that the SMA 8 low RR pavement has a durability equal to SMA 11, which is the traditional used pavement type. Further accelerated tests are conducted in 2017 at VTI in Sweden. Expected durability More than 16 years. 3.

4 The very first in 2012 The first in-service test section 2012 The first Motorway

5 Pre-implementation activities in Optimisation of mix-design in relation to results from 2016 Pre-test section with optimised mix on local road Tests section on motorway M30, km 151, ,080 (north bound) Reference: M30, km 143, ,000 (north bound) Measurement campaign on existing and new test section Friction, Evenness, Texture, Rolling Resistance and Noise Accelerated tests of optimised mix-design, VTI, Sweden Evaluation and recommendations Workshop Danish Asphalt Industry February March April June June, July and August September September November 5. October Writing tender 2017/2018 Tender goes out Early

6 The value of using pavements with low rolling resistance in relation to using traditional motorway pavements The scenario is that we pave 50 km low rolling resistance pavements per year, replacing existing pavements. The table shows the reduction potential using SMA 11 or COOEE SMA 8, respectively. The overall reduction in CO 2 using SMA 8 COOEE instead of SMA 11 is app. 63% (calculations based on 1600 road sections on Danish state roads) Pavement type Year 2018 reduction in CO 2 (ton) Year 2019 reduction in CO 2 (ton) Year 2020 reduction in CO 2 (ton) SMA 8 COOEE SMA

7 Paving of 2,5 km test section SMA 8, COOEE and approx. 1,5 km reference section of SMA 11, in June

8 Was it possible to reach the expectations of CO 2 emission reduction. Pavement Year 2018 reduction in CO 2 (ton) Year 2019 reduction in CO 2 (ton) Year 2020 reduction in CO 2 (ton) SMA 8 COOEE SMA Technical parameters for the calculations Pavement Texture MPD Evenness IRI (m/km) SMA 8 COOEE 0,6 mm 0,90 m/km SMA 11 0,9 mm 0,90 m/km 8.

9 Friction 0,8 FRICTION M30 60 km/h SMA 8 COOEE June 2017 immediately after paving 0,7 0,6 0,5 0,4 0,3 0,2 0, ,0 153,5 153,0 Position 152,5 152,0 151,5 Left Right 9.

10 Friktion 0,8 Friction M30 60 km/h SMA 8 COOEE September 17, ,7 0,6 0,5 0,4 0,3 0,2 0, ,5 153 Kilometer 152, ,5 Left Right 10.

11 Friktion 0,9 Friction M30 60 km/h SMA 11 August 1, ,8 0,7 0,6 0,5 0,4 0,3 0,2 0, ,8 144,6 144,4 144,2 Kilometer ,8 143,6 143,4 Left Right 11.

12 Friktion 0,9 Friction M30 60 km/h SMA 11 September 17, ,8 0,7 0,6 0,5 0,4 0,3 0,2 0, ,8 144,6 144,4 144,2 Kilometer ,8 143,6 143,4 Left Right 12.

13 IRI m/km 0,9 Evenness M30 SMA 8 COOEE August 31, ,8 0,7 0,6 0,5 0,4 0,3 0,2 0, ,5 153 Position - km 152, ,5 13.

14 IRI m/km 1,8 Evenness M30 SMA11 August 31, ,6 1,4 1,2 1 0,8 0,6 0,4 0, ,8 144,6 144,4 144,2 Kilometer ,8 143,6 143,4 Left Right 14.

15 IRI m/km 1,8 Evenness M30 old pavement September 16, ,6 1,4 1,2 1 0,8 0,6 0,4 0, ,8 144,6 144,4 144,2 Kilometer ,8 143,6 143,4 Left Right 15.

16 MPD, mm 2 1,8 1,6 1,4 1,2 1 0,8 0,6 0,4 0, ,5 Texture M30 SMA 8 COOEE August Kilometer 152, ,5 Middel Average MPD venstre left Average Middel MPD højre right MPD left venstre MPD right højre 16.

17 MPD, mm 2 1,8 1,6 1,4 1,2 1 0,8 0,6 0,4 0, ,8 144,6 Texture M30 SMA 11 August ,4 144,2 Kilometer ,8 143,6 Average Middel MPD MPD venstre left Average Middel MPD højre left MPD venstre left MPD højre left 143,4 17.

18 Average. RR Coefficient Rolling Resistance measured on M ,01 0,0098 0,0096 0,0094 0,0092 0,009 0,0088 0,0086 0,0084 0,0082 0,008 SMA SMA 8 COOEE 8 NEW Ny SMA standard standard Ref gammel OLD SMA

19 Average reduction in Rolling Resistance % 12 M30, Reduction in Rolling Resistance compared to old SMA SMA 8 COOEE SMA 8 COOEE Ny SMA 11 standard NEW SMA 11 standard 19.

20 Has it been possible to live up to the expectations? Pavement Year 2018 reduction in CO 2 (ton) Year 2019 reduction in CO 2 (ton) Year 2020 reduction i CO 2 (ton) SMA 8 COOEE SMA Technical parameters for the calculations Pavement Texture MPD Evenness IRI (m/km) SMA 8 COOEE 0,6 mm 0,90 m/km SMA 11 0,9 mm 0,90 m/km Results Pavement Texture MPD Evenness IRI (m/km) Friction Rolling Resistance reduction compared to old SMA 11 SMA 8 COOEE 0,62 mm 0,52 m/km 0,65 11,3 % SMA 11 1,04 mm 0,65 m/km 0,75 2,9 % 20.

21 Conclusion: Motorway pavements can be constructed with the expected functional conditions; Friction, texture, evenness and rolling resistance This is fine for the expectations of to day But we are raising the bar for what we expect by the performance of the pavements and the question is - What is the requirement for the future? - What should we measure and are the measurement devices and especially the indexes we are using sufficiently precise to establish the right and robust KPI s? 21.