Geosynthetics June/July 2020 - 36

G

Enhanced moisture management of pavement systems through capillary suction

The combination of all
these different research
efforts has confirmed
the performance of the
recently developed ELDG.
Continuous moisture
management of pavement
systems provides a new
function of geosynthetics.
The ability of an ELDG
to reduce the moisture
content of base/soil
material in unsaturated
conditions provides
significant long-term
benefits to roadways.

freezing. The environmental information required to accomplish steps 2 and
3 is available at the National Oceanic
and Atmospheric Administration website (https://www.noaa.gov) for the U.S.
and at the Environmental and Natural
Resources website for Canada (www
.climate.weather.gc.ca). (4) Determine the
damage to the base course for each of the
saturation rain events. Following these
steps will lead to a hydraulic improvement factor that can be applied to the 1993
AASHTO Flexible Pavement Structural
Design Method. The current MEPDG
software includes an enhanced integrated
climate model (EICM) to modify the
representative resilient modulus of base
course for seasonal effects. Based on the
water content change measured in the
previous tests, modification can be made
to the environmental effect model in the
MEPDG design software for the design of
the wicking geotextile in roadway structures. However, the current MEPDG
design software does not allow modification to the environmental effect component. The MEPDG design software does
allow input of base course resilient modulus of each month of the year. The base
course resilient modulus of each month
can be calculated with the same procedure
described in the previous section.

Conclusions
The combination of all these different
research efforts has confirmed the performance of the recently developed ELDG.
Continuous moisture management of
pavement systems provides a new function of geosynthetics. The ability of an
ELDG to reduce the moisture content
of base/soil material in unsaturated conditions provides significant long-term
benefits to roadways. These benefits
include modulus increase, pavement sustainability, increased performance and
maintenance reductions. ELDG can also

36

address frost heave and thaw weakening
conditions as well as shrink/swell from
expansive soils. These research results
have provided guidance to incorporate
ELDG into AASHTO 1993 Pavement
Design Method and into MEPDG.
References
Budhu, M. (2010). Soil mechanics and foundations, third
edition. John Wiley & Sons Inc.
Cedergren, H. R. (1987). Drainage of highway and
airfield pavements, second edition. Robert E. Krieger
Publishing Company Inc.

S
r

Cedergren, H. R. (1994). "America's pavements: World's
longest bathtubs." Civil engineering, 64(4), 56-58.
Christopher, B. R., and McGuffey, V. C. (1997). Pavement
subsurface drainage systems, NCHRP synthesis of
highway practice 239. Transportation Research Board,
National Research Council, Washington, D.C.

P

Delgado, I. E. G. (2015). Use of geotextiles with enhanced
lateral drainage in roads over expansive clays. Thesis,
Master of Science in Engineering. University of Texas
at Austin.

NA

Guo, J., Han, J., Zhang, X., and Wang, F. (2018).
Evaluation and design of wicking geotextile for pavement
applications-final project report. Dissertation.
University of Kansas.

CO

Henry, K. S., and Holtz, R. D. (2001). "Geocomposite
capillary barriers to reduce frost heave in soils."
Canadian Geotechnical Journal, 38(4), 678-694.

ST

AD

PH

Lin, C., and Zhang, X. (2017). Development of design
method for H2Ri wicking fabric in pavement structures.
University of Alaska Fairbanks and University of Kansas.

EM

P

Thiam, P., and Bradley, A. (2018). Mitigating edge
cracking on low volume pavements in the Yukon with
wicking geotextile: Phase 3-Site monitoring, analysis
and findings. FPInnovations.

C
C

¨

Zhang, X., and Belmont, N. (2009). Use of woven
geosynthetic fabric with different wicking capability to
help prevent frost heaving in Alaska pavements-4th
progress report. University of Alaska Fairbanks.

CA

Zhang, X., and Presler, W. (2013). Use of H2Ri wicking
fabric to prevent frost boils in the Dalton Highway Beaver
Slide area, Alaska-final report. Department of Civil
and Environmental Engineering, University of Alaska
Fairbanks.

CR

AC

BI

Zornberg, J. G., Bouazza, A., and McCartney, J. S. (2010).
"Geosynthetic capillary barriers: Current state of
knowledge." Geosynthetics International, 17(5).

ST

Zornberg, J. G., Azevedo, M., Sikkema, M., and
Odgers, B. (2017). "Geosynthetics with enhanced
lateral drainage capabilities in roadway systems."
Transportation Geotechnics 12: 85-100. G

AU

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>> For more, search ELDG
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Geosynthetics June/July 2020

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