Project Progress Update Performance of Tencate Paving Fabrics in Asphalt Concrete Pavements

Transcription

1 Project Progress Update Performance of Tencate Paving Fabrics in Asphalt Concrete Pavements Jenny Liu, Sheng Zhao, and Lin Li University of Alaska Fairbanks 7/22/2016

2 Outline Recap of the previous project Objectives of this project Current Status of the project Field monitoring and results Lab evaluation of Mirapave and TruPave Next step 2

3 Recap of the Previous Project Evaluated the engineering properties of asphalt pavement reinforced by the multi-axial interlayer G 4, and two bi-axial interlayers G50/50 and G100/100 G 4 G100/100 G50/50 3

4 Recap of the Previous Project Adding a paving interlayer can increase pavement structure stiffness, greatly reduce the permeability and provide good resistance to low temperature cracking and fatigue cracking FEM simulation indicated that G 4 could improve the stress distribution more effectively Field sections were established and monitored Established in July 2013 Monitored in August and October 2013, summers in 2014 and

5 Objectives of This Project Further evaluate the performance of paving interlayer-reinforced AC pavements in Alaska through two more years field monitoring Investigate the effects of modified Mirapave and TruPave as patching materials on mitigating cracking distress for roadways through laboratory tests Mirapave TruPave 5

6 Field monitoring Current Status Survey conducted in June 2016 Laboratory evaluation of Mirapave and TruPave Dynamic modulus test, completed Overlay test, completed Research reporting April, 2016 July,

7 Section Control Section G 4 Test Section G50/50 Test Section G100/100 Test Section Survey Previous 1 Field Monitoring Transverse crack (#) 7 minor Longitudinal crack, NB (ft) 300 medium-major 13 minor Longitudinal crack, SB (ft) New 2 4 minor 4 medium-major 0 Total 11 minor 304 medium-major 13 minor Previous 8 minor 63 minor 14 minor New 2 minor 14 minor 0 Total 10 minor 77 minor 14 minor Previous 1 major 78 minor 60 minor New minor Total 1 major 78 minor 80 minor Previous 1 major 0 0 New Total 1 major Previous Data collected before June New Data collected in June

8 Summary of 2016 Survey Four more minor transverse cracks were observed on the control section Two new minor transverse cracks were found on the G 4 section No transverse crack has been observed on G50/50 and G100/100 sections since 2014 survey A few longitudinal cracks were found on the control, G 4 and G50/50 sections 8

9 Control Section New minor transverse crack New moderate-major longitudinal crack 9

10 G 4 Section New minor transverse crack New minor longitudinal crack 10

11 G50/50 Section No new transverse crack, but polishing is very obvious) New minor longitudinal crack on the shoulder 11

12 G100/100 Section No new transverse or longitudinal crack, but polishing is very obvious The major transverse crack observed in May 2014, 1/8 to 1 in width 12

13 Field Observation to Date Three years surveying and monitoring were conducted All sections reinforced with paving interlayers showed better pavement performance than the control section The G100/100 reinforced pavement showed the best performance, followed by G50/50 and G 4 sections However, three years are considered a short period in the entire life cycle of a pavement A few construction issues were noticed It is recommended that we continue monitoring 13

14 Dynamic modulus test Laboratory Testing 14

15 Dynamic Modulus Results 1.E+05 Dynamic Modulus (MPa) 1.E+04 1.E+03 1.E+02 1.E+01 1.E+00 1.E-04 1.E-02 1.E+00 1.E+02 1.E+04 Frequency (Hz) Control Mirapave TruPave G4 G100/100 G50/50 15

16 Overlay Test Configuration Typical overlay test setup Partial patching Entire paving interlayer Modified overlay test setup 16

17 Sample Preparation 17

18 Using AMPT to Conduct Overlay Test 18

19 Overlay Test Opening displacement at 0.6 mm (strain control mode) Maximum of 1000 loading cycles Results recorded as the cycle number at 93% reduction in peak load relative to the first cycle 19

20 Testing results Reduction in peak load (%) Control MiraPave_Complete MiraPave_Partial TruPave_Complete TruPave_Partial Loading Cycles New materials vs. control Reduction in peak load (%) Control MiraPave_Partial TruPave_Partial G4 G50/50 G100/ Loading Cycles Considering the previous tested paving interlayers 20

21 Testing Results Reduction in Peak Load (%) Control MiraPave_Complete MiraPave_Partial TruPave_Complete TruPave_Partial Loading Cycles Reduction in peak load (%) Control MiraPave_Partial TruPave_Partial G4 G50/50 G100/ Loading Cycles Taking the first 100 cycles only 21

22 Debonding Observed De-bonding was observed on samples with an entire layer 22

23 The Load Required to Maintain the Constant Displacement Load at 1st Cycle Load at 100th Cycle Load (kn)

24 Failure Mode Observation The failure mode can be observed from the attached videos 24

25 Preliminary Lab Testing Summary The reinforcement of using Mirapave and TruPave as patching materials could be observed through overlay and IDT tests Partial patching with Mirapave and TruPave mitigated the cracking development (cracking path) The load reduction percentage results showed that partial patching with Mirapave or TruPave is promising in reflective cracking mitigation Mirapave performed better than TruPave through preliminary testing results 25

26 Field survey in 2017 Next Step Further lab testing and analysis Using photogrammetry method to quantify the crack development with Overlay test setup Low temperature performance through Indirect Tension (IDT) test 26

27 Using Photogrammetry to Quantify the Crack Development 27

28 Modified IDT Test Do we test the partial patching model or the entire paving interlayer model? 28

29 Modified IDT Test Initiating crack on one side? 29

30 Questions? 30