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lDOT Mechanistic Based Design Procedure was used to evaluate the performance of concrete pavements being tested in Mn/ROAD. To accurately evaluate the probably performance of the pavements, fatigue characteristics of concrete used in Mn/ROAD had to be determined. Fatigue tests were run on simply supported beams, fully supported beams and fully supported slabs to evaluate the fatigue behavior of concrete using the different types of specimens. Results show that when interpreted in the conventional manner using Whaler diagram, the fatigue responses were the same with all three specimen types. However, the strength of the concrete at first crack was about 30 percent higher in the fully supported slabs than for the simply supported beams. The slab specimens also showed a much longer performance life between first crack and full cracking than the beam specimens. These results indicate a significantly longer fatigue life for the slabs than predicted using the strength data from simple beams. When the findings were applied to the concrete pavements in Mn/ROAD, using the lDOT Mechanistic Based Design Algorithms, the conclusion was that the pavements should not have failed. Results from Mn/ROAD show no evidence of structural distress at this time, thus partially validating the lDOT Mechanistic Based Design Procedure.
The quality and testing of materials used in construction are covered by reference to the appropriate ASTM standard specifications. Welding of reinforcement is covered by reference to the appropriate AWS standard. Uses of the Code include adoption by reference in general building codes, and earlier editions have been widely used in this manner. The Code is written in a format that allows such reference without change to its language. Therefore, background details or suggestions for carrying out the requirements or intent of the Code portion cannot be included. The Commentary is provided for this purpose. Some of the considerations of the committee in developing the Code portion are discussed within the Commentary, with emphasis given to the explanation of new or revised provisions. Much of the research data referenced in preparing the Code is cited for the user desiring to study individual questions in greater detail. Other documents that provide suggestions for carrying out the requirements of the Code are also cited.