Accelerated pavement testing program with the mobile load simulator MLS10 – temperature analysis

2015 ◽  
pp. 687-692 ◽  
Author(s):  
B Wacker
Keyword(s):  
Temperature Analysis ◽  
Accelerated Pavement Testing ◽  
Testing Program ◽  
Load Simulator ◽  
Pavement Testing

Detection and Monitoring of Cracks in Asphalt Pavement Under Texas Mobile Load Simulator Testing

1997 ◽  
Vol 1570 (1) ◽  
pp. 10-22 ◽  
Author(s):  
N.-K. J. Lee ◽  
F. Hugo ◽  
K. H. Stokoe
Keyword(s):  
Surface Layer ◽  
Longitudinal Direction ◽  
Main Mode ◽  
Accelerated Pavement Testing ◽  
Surface Cracking ◽  
Longitudinal Stiffness ◽  
Load Simulator ◽  
Surface Distress ◽  
Pavement Testing ◽  
Falling Weight

The Texas mobile load simulator (TxMLS) is a newly developed accelerated pavement testing device used to evaluate pavement performance under real trafficking loads. This evaluation is performed by applying trafficking loads and monitoring surface distress, such as cracking and rutting, in conjunction with a number of other measurements of the pavement, such as those conducted with the falling weight deflectometer, multidepth deflectometer, strain gauge, pressure cells, and seismic (stress-wave) tests. A procedure for monitoring the progressive degradation of the asphalt surface was developed using the spectral-analysis-of-surface-waves (SASW) technique. This procedure was applied with the TxMLS and proved to be equally effective. SASW tests that were performed intermittently between trafficking phases on trafficked and untrafficked areas show ( a) the effect of temperatures and frequencies on the asphalt moduli, ( b) the importance of temperature and frequency corrections in analyzing the degradation of the asphalt surface layer, and ( c) the long-term trends in surface-wave velocities (and hence, moduli) of the surface layer with increasing number of load applications. It was found that stiffness of the asphalt layer in the longitudinal direction was progressively reduced under trafficking. Concurrently, surface cracking progressively increased. The reduction in longitudinal stiffness occurred at a faster rate than the crack growth. In contrast, the reduction in the stiffness of the asphalt layer in the transverse direction was slower, probably because the main mode of cracking was transverse. The feasibility of using SASW testing as a predictor of degradation and imminent cracking was confirmed with these studies.

Establishing the California Department of Transportation Accelerated Pavement Testing Program

1996 ◽  
Vol 1540 (1) ◽  
pp. 91-96 ◽  
Author(s):  
W. A. Nokes ◽  
P. J. Stolarski ◽  
C. L. Monismith ◽  
J. T. Harvey ◽  
N. Coetzee ◽  
...  
Keyword(s):  
Laboratory Tests ◽  
Pilot Project ◽  
Status Report ◽  
Department Of Transportation ◽  
California Department ◽  
Accelerated Pavement Testing ◽  
Testing Program ◽  
Testing Technology ◽  
History Of ◽  
Pavement Testing

How the California Department of Transportation Accelerated Pavement Testing (CAL/APT) Program was established is described. Discussion includes history of the program, search for full-scale pavement testing technology suitable to California, results of a pilot project conducted on test pavements built in South Africa, laboratory tests included in the CAL/APT program, and development of an organization to manage CAL/APT and implement its products. A status report on testing and planning is included.

scholarly journals Evaluation of Cost-Effective Modified Binder Thin Chip and Cape Seal Surfacings on an Anionic Nano-Modified Emulsion (NME)-Stabilised Base Layer Using Accelerated Pavement Testing (APT)

2021 ◽  
Vol 11 (6) ◽  
pp. 2514
Author(s):  
Gerrit J. Jordaan ◽  
Wynand J. vd M. Steyn ◽  
Andre Broekman
Keyword(s):  
Cost Effective ◽  
Base Layer ◽  
Accelerated Pavement Testing ◽  
Modified Binders ◽  
Chip Seal ◽  
Load Simulator ◽  
Pavement Testing ◽  
Modified Binder ◽  
Design And Testing ◽  
Selection Of

Emulsion stabilisation of base layers surfaced with chip seals often proves problematic, with chips punching into the base and early distress. This can be aggravated by the use of modified binders that restricts the evaporation of moisture from pavement layers. The introduction of new-age (nano)-modified emulsion (NME) stabilisation has the advantage that water is chemically repelled from the stabilised layer, resulting in an accelerated development of strength. A need was identified to evaluate the early-life performance of selected chip and Cape seals, together with identified modified binders on anionic NME-stabilised base layers constructed with materials traditionally classified as unsuitable, using archaic empirically derived tests. Three different chip seal surfacings with unconventional modified binders were constructed and evaluated using accelerated pavement testing (APT) with the Model Mobile Load Simulator—3rd model (MMLS3). The objectives of the experimental design and testing were to evaluate the binder performance, chip seal performance in terms of early loss of chips before chip orientation, punching of the chips into the anionic NME-stabilised base and deformation characteristics of a Cape seal that was hand-laid using an anionic NME slurry without any cement filler. It was shown that that chip seal surfacings can be used at low risk, on a base layer containing materials with fines exceeding 22%. The selection of specific modified binders can reduce risks associated with chip seal surfacings, which can impact construction limitations. The recommended use of elastomer-modified binders on newly constructed or rehabilitated layers, resulting in moisture entrapment, needs to be reconsidered.

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