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Evaluation of pavement bleeding problem on I-55 in Illinois

Shortly after construction fat spots began to appear throughout the project on a 3 inch hot mix asphalt (HMA) overlay of an existing PCC pavement. The fat spots appeared to occur at end of truck loads. After time the fat spots developed into potholes and the asphalt appeared to be stripped from the aggregate at the bottom of the potholes. Some rutting and shoving also developed at these fat spots. The objective of this study was to evaluate the HMA and to determine potential causes of these fat spots. The test plan included a visual inspection of the pavement and obtaining core samples from fat spots, adjacent to fat spots and from random locations throughout the project. Rut depth measurements were also obtained. The cores were tested for asphalt content, gradation, void content and slag content. Several of the asphalt mix layers were split in half (resulting in top and bottom halves) and the asphalt content and gradation of each half compared. The asphalt cement from several cores was recovered and the viscosity and penetration determined. The results of this study indicated that the most likely cause of the fat spots was contamination of the HMA with some solvent (likely diesel) during the placement operation.