Pavement Experiences Indicative of Needs to Consider Design and Specification Revisionsby Frank V. Hermann, Ralph M. Parsons Co, Honolulu, United States,
Abstract: Recent experiences on two airfield paving projects have indicated some problem areas which may warrant further consideration in design manuals and specifications. 1. Construction of the centerline joint as an interior saw cut contraction joint contributes to a very smooth riding pavement. Removal of the free edge of the slip formed slab close to the main gears, while expensive, may result is a higher quality pavement. 2. Large slip form pavers construct a very smooth riding pavement except at the transverse construction joints placed at the end of each day's work. Work is needed to achieve a smooth construction joint. 3. It was observed that many of the problem areas are in the early segments placed each day. No clear reason can be found which is a common attribute to these problems. A rigid checklist or criteria may be necessary to avoid this type of problem. 4. Large slip form pavers do not appear to produce a pavement which conforms strictly to the letter of the straightedge requirements. Nevertheless the riding quality of the pavement is excellent. The straightedge requirement appears to be a test which should be revised or replaced. 5. Joint design requires consideration of the need for load transfer dowels in longitudinal contraction joints when pavement is constructed in multiple lanes on one pass. 6. Requirements for tie bars in the outer longitudinal joint need to be reconsidered. They may contribute to irregular cracking when the pavement is constructed in multiple lanes on one pass. 7. Density requirements for non-cohesive soils are difficult to achieve, and in certain types of soils may be unnecessary. 8. Rigid stabilized base under a rigid pavement is considered desirable by many engineers, and undesirable by others. However when used it may be necessary to control the strength of the base and the location of the joints.
Subject Headings: Joints | Pavement design | Airport and airfield pavements | Construction management | Concrete pavements | Slabs
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