Details:

Creators:
Gaspard, Kevin ; Zhang, Zhongjie
Gaspard, Kevin ; Zhang, Zhongjie Less -
Corporate Creators:
Louisiana Transportation Research Center
Corporate Contributors:
United States. Federal Highway Administration
Subject/TRT Terms:
[+]
Case Studies Load Transfer Pavement Distress Pavement Joints Polyurethane Foams Portland Cement Concrete Ride Quality Roughness Transverse Joints
Publication/ Report Number:
FHWA/LA.14/13-02-TA-P ; State Project Number: 034-30-0023
FHWA/LA.14/13-02-TA-P ; State Project Number: 034-30-0023 Less -
Resource Type:
Tech Report
Geographical Coverage:
Louisiana
Corporate Publisher:
Louisiana Transportation Research Center
Abstract:
A case study was conducted by the Louisiana Transportation Research Center (LTRC) to assess the effectiveness of reducing faulting on jointed concrete

pavement (JCP) with polyurethane foam (PF) on LA 1 Bypass, S.P. 034-30-0023. The PF fault correction process entailed reducing faults to

approximately 0.25 inches by saw cutting full depth through the joints and lifting the slabs with PF whose free rise density was 6 pcf.

A sampling plan was established where the entire project was measured for faulting and roughness by a high speed profiler before treatment with the PF

fault correction process and 0.6, 2.1, 3.4, and 4.4 years after treatment. Three test sections with 11 slabs each were assessed with the falling weight

deflectometer (FWD), ARRB walking profiler, and manual fault measurements. Seventeen cores were taken at various locations to obtain in-place PF

samples. Statistical hypothesis testing was conducted comparing the density and strength of PF before and after it was injected into the pavement.

Testing results indicated that repair goals of reducing faults were realized by the PF fault correction process, but at the sacrifice of severely reducing load

transfer efficiency (LTE) at the transverse joints. Service life extensions of approximately 6.0 and 8.3 years on the north and south bound roadways,

respectfully, for fault height reduction were discovered. Unfortunately, the PF fault correction process severely impacted the LTE with 80 percent of joints

having poor load transfer, 20 percent increase of joints needing load transfer improvement, and 0 percent of the joints in good condition. Deflections at the

joints and center-intermediate slab locations were increased as much as 46 percent by the PF process indicating lower strength conditions. Void potentials

were increased slightly (8 percent) by the process.

The estimated service life extension based on the IRI parameter was 3.1 years and 5.7 years for the north and south bound roadways, respectively.

Taking into account all the parameters analyzed in this study, the PF fault correction process was not recommended as a pavement preservation treatment

for fault correction or ride quality improvement due to the detrimental effects discovered in this study.


Format:
PDF
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:d9788e2755917fa9e0316ea3f21e51304aec432bda39c7ffdf327073652467ee
Download URL:
https://rosap.ntl.bts.gov/view/dot/28644/dot_28644_DS1.pdf
File Type:

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