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The 25 papers presented at the National Seminar on Portland Cement (PCC) Pavement Recycling and Rehabilitation are reproduced in this report. The seminar was held in St. Louis, Missouri, September 27-30, 1981, and was attended by 219 people from national, state, and local governments, as well as industry and academia. These proceedings cover all aspects of PCC pavement recycling and rehabilitation, including condition surveys, jacking, drainage, joint repair, profile correction, bonded overlays, and load transfer restoration for both urban and rural situations. Cost and energy considerations, specifications, quality control, and environmental considerations were addressed. Equipment of all types was discussed and research currently underway was reviewed.
"It is generally agreed that the skid resistance of a pavement is controlled by the surface texture characteristics. Therefore, by measuring the relevant parameters describing texture, or by measuring a physical process dependent on texture, regression techniques can be used to relate skid resistance to the chosen texture parameter or process. Two scales of texture are of particular importance: microtexture (small-scale asperities) and macrotexture (large-scale asperities). This report describes work performed to: (1) review candidate macrotexture and microtexture measurement methods that can be made at highway speeds (at or above 40 mph), which are presently used or have potential for use in pavement texture measurement; (2) design and build a prototype of the most promising method; (3) evaluate the effects of pavement surface texture on skid resistance; and (4) investigate non-friction-related effects of pavement surface texture. A prototype noncontact vision system which takes texture measurements at highway speeds was developed, and several improvements were made to upgrade the system to provide an advanced-operational prototype. Both hardware and software enhancements have yielded a texture measurement system that is a fast, efficient, and reliable way of obtaining pavement macrotexture data"--Technical report documentation p.
This synthesis report will be of interest to pavement design, construction, management, and research engineers, highway safety officials, and others concerned with pavement friction characteristics. It describes the current state of the practice and discusses the methods used for evaluating wet pavement friction characteristics of new and restored pavements. This synthesis reviews models used for measuring and evaluating friction and texture, causes for friction changes over time, and aggregate and mix design to provide adequate friction. Also presented are construction and surface restoration practices for providing good pavement surface characteristics. In addition, considerations of noise and ride quality are discussed when compromise may be required.
This report contains guidelines and recommendations for managing and designing for friction on highway pavements. The contents of this report will be of interest to highway materials, construction, pavement management, safety, design, and research engineers, as well as others concerned with the friction and related surface characteristics of highway pavements.