Field investigation of low-temperature cracking and stiffness moduli on selected roads with conventional and high modulus asphalt concrete

Transcription

1 Field investigation of low-temperature cracking and stiffness moduli on selected roads with conventional and high modulus asphalt concrete Józef Judycki 1, Mariusz Jaczewski 1, Dawid Ryś 1, Marek Pszczoła 1, Piotr Jaskuła 1, Adam Glinicki 1. Gdansk Univeristy of Technology, Department of and Transportation Engineering. General Directorate for National Roads and Motorways, Bialystok Division September 5, Developed in France in 1980s. Since ~000 used in Poland The most road sections were built in Poland between (mostly using 0/30 neat bitumen) 3 cm Bitumen: HMAC 10/15, 15/5, 0/30, PmB 5/55 60 AC 35/50, 50/70 31 cm September 5, 017 1

2 Field investigation No. of sections 33 HMAC 47 AC September 5, Field investigation Not repaired low temperature crack Repaired low temperature crack September 5, 017 4

3 Field investigation Other distressess September 5, Field investigation No Description of road section (year of construction) Jeżewo Białystok (01) Zambrów Bypass (01) DK8, Białystok Katrynka (009) One of Polish Motorway section (008/010) No. of Pavement construction a) FWD test section b) low-temperature cracks per km 4 cm SMA 3 cm HMAC 3 cm CS 4 cm SMA 3 cm HMAC 3 cm CS 4 cm SMA 3 cm HMAC cm CS 4 cm SMA 4 cm AC 0 cm CS 1) L ) R 3) L 4) R 5) R 6) L 7) L 8) L 9) L Remarks: a) SMA stone matrix asphalt, HMAC high modulus asphalt concrete, AC asphalt concrete, CS crushed stone b) L left carriageway, R right carriageway 5,3 1,7 0,7,3 8,7 1,7 1, September 5,

4 Field investigation (year 014) Percentage of sections 100% 90% 80% 70% 60% 50% 40% 30% 0% 10% 0% Heavy cracked Middle cracked Litlle cracked Not cracked 5 15 AC WMS 10 < IS < IS < 10 0 < IS < IS = 0 HMAC September 5, AC 4 3 AC mean IS 3,0 cr./km max 15 cr./km mean IS 1,0 cr./km max 8 cr./km FWD test results (deflections) Property Jeżewo Białystok Zambrów Bypass Deflections on sections[ m] DK8, Białystok Katrynka One of Polish Motorway section no of test section: Mean (U śr ) % percentile Reliable (U m ) CoV, % No. of points Remarks: a) Um = U śr +, where - standard deviation b) CoV coefficient of variation September 5,

5 FWD test results (stiffness moduli back calculations) Bituminous layers Base layer E10 ET T Improved soil September 5, Property Jeżewo Białystok Zambrów Bypass Stiffness modulus [MPa] DK8, Białystok Katrynka One of Polish Motorway section no of test section: Mean % percentile % percentile CoV, % 5% 6% 1% 8% 8% 6% 4% 34% % No. of points September 5,

6 September 5, September 5,

7 Load transfer efficiency factor k y y 1 September 5, Load transfer efficiency factor Property Load transfer efficiency factor k [-] No. of the test section, (acc. to table 1) 6 7 Mean 0,66 0,73 0,76 CoV, % No. of points k < 0,7 lack of load transfer efficiency 0,7 < k <0,95 partial load transfer efficiency k > 0,95 full load transfer efficiency September 5,

8 Conclusions Test sections constructed using HMAC layers presents two or three times higher number of low temperature cracks in comparison to sections constructed with conventional AC layers. The FWD test results showed, that all tested sections were constructed according to best practices and are homogeneous in the case of pavement deflections. The bearing capacity of all tested sections is very high. September 5, Conclusions The stiffness moduli determined for the asphalt layers is almost two times higher for test sections with HMAC layers in comparison to test sections with conventional AC layers. While there are no strong correlations between stiffness moduli and cracking intensity, the number of low temperature cracks increases with the increase of the value of the stiffness moduli. September 5,

9 Conclusions The cracking intensity of new ( years of service) road sections constructed with HMAC base is disturbing. The cracking index ranges from 0,7 up to 5,3 cracks per km. The load transfer efficiency on the sections with HMAC layers is poor. Two out of three tested sections presents only partial load transfer, while the last section presents lack of load transfer. September 5, Thank you for your attention! Full report: Acknowledgements It is gratefully acknowledge that the field investigation were performed in a research project sponsored by the Polish General Directorate for National Roads and Motorways. Authors would like also to thank the Bialystok Division of General Directorate for National Roads and Motorways for conducting the FWD tests. September 5,

10 No. 1 Description of road section (year of construction) Jeżewo Białystok (01) Zambrów Bypass (01) Type of bitumen No. of low-temperature cracks per km * Neat 0/30,1 3,47 3,50 Neat 0/30 0,00 1,99 1,50 3 DK8, Wasilków Bypass (011) Neat 0/30 0,0,80 1,33 4 DK8, Białystok Katrynka (009) Neat 0/30 8,86 15,71 8,67 5 DK8, Sztabin Kolnica (005) PmB 30B MCE Base Remarks: * Change of field investigation method 5,90 7,6 5,00 September 5, Field investigation (HMAC Sections) September 5,