United States Department of Transportation
i
Structural Assessment of Inundated Roadways in Livingston Parish, Louisiana With the Falling Weight Deflectometer
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2020-01-01
[PDF-1.18 MB]
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Edition:August 2016 to May 2019
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Abstract:Researchers discovered strong evidence of damage to Livingston Parish’s inundated roadway system during the flood of August 2016. LTRC conducted a comprehensive structural assessment of inundated roadways in Livingston Parish, Louisiana with the falling weight deflectometer (FWD). Treated (inundated) versus non-treated (non-inundated) statistical methods were employed to prove damage. Three parameters from the FWD were used in the analysis, in-place structural number (SNeff), deflection at the first sensor of the FWD (D1), and subgrade resilient modulus (Mr). The damage was translated into an equivalent thickness of asphaltic concrete (AC) pavement from the parameter of SNeff using pavement design methods typically used by the Louisiana Department of Transportation and Development (DOTD). The data were sorted into three groups based on the thickness of the AC pavement: All data points (all thickness groups), 4 in. to 3 in. group, and 2 in. to 2.5 in. group. The statistical analysis of the entire set of data indicated that statistical differences existed for all three parameters, SNeff, D1, and subgrade Mr. Regarding SNeff, the difference between the mean values of the non-inundated and inundated roadways was equivalent to approximately 1 in. of AC. The differences in the mean values for D1 and subgrade Mr indicated that the inundated pavements were approximately 22.5 percent and 10.3 percent, respectively, weaker than the non-inundated pavements. Statistical comparisons on the 4 in. to 3 in. thickness group indicated that statistical differences existed for all three parameters, SNeff, D1, and subgrade Mr as with the all thickness group. In the case, the differences in SNeff was equivalent to approximately 2.5 in. of AC. Regarding the D1 and subgrade Mr parameters, the results indicated that the inundated pavements were approximately 56.5 percent and 25.3 percent, respectively, weaker than the non-inundated pavements. Statistical differences in the three parameters, SNeff, D1, and subgrade Mr for the 2.0 in. to 2.5 in. thickness group were not discovered; however, differences in magnitudes of the means for each parameter were discovered, all indicating that the inundated pavements were weaker than the non-inundated pavements. Regarding the SNeff, the difference in the mean values between the non-inundated and inundated pavements were equivalent to approximately 0.5 in. of AC. The difference in stiffness between the inundated and non-inundated pavements based on the D1 parameter was approximately 22.6 percent, while the strength difference in subgrade Mr was approximately 4.6 percent.
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