Geofoam as a Subbase Material f bb i l Issue: Premature - - PowerPoint PPT Presentation

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Nov 28, 2022 209 likes •337 views

Geofoam as a Subbase Material f bb i l Issue: Premature pavement distress/ failure has occurred atop geofoam. What is the cause p g of this poor performance? Steven F . Bartlett, Ph.D., P .E. Univ. of Utah TH 4 7 in I santi County,

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f bb i l Geofoam as a Subbase Material

Issue: Premature pavement distress/ failure has occurred atop geofoam. What is the cause p g

f this poor performance?

Steven F . Bartlett, Ph.D., P .E. Univ. of Utah

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i i i TH 4 7 in I santi County, Minnesota

geofoam fill placed in Nov. 2005
roadway completed in Dec. 2005

y p

small cracks in Spring 2006
severe rutting Spring 2007

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i i i TH 4 7 in I santi County, Minnesota

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i i i TH 4 7 in I santi County, Minnesota

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ibl f i Possible Causes of Distress

Geofoam out of specification
Geofoam damage during construction

Geofoam damage during construction (placement of overlying materials and compaction) P t ti d d i d

Pavement section under-designed
no load distribution slab
flexible pavement with insufficient

structural support

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Findings from Dutch Research ( BASt – Test facility)

concrete cem ented sand

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Findings from Dutch Research ( BASt – Test facility)

Findings – Pavement Design This means that the compacted base material placed atop the EPS has lower stiffness and this should be considered in the stiffness and this should be considered in the pavement design.

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Findings from Dutch Research ( BASt – Test facility)

Findings - Construction LDS protects the EPS during construction/ compaction, granular base does not.

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Findings from Dutch Research ( BASt – Test facility)

Findings – Pavement Performance Pavement life may be 2 times shorter. Early cracking may occur

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Findings from Australian Research

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