Roller-compacted concrete pavement (RCCP) is a technology that involves the use of conventional materials and construction equipment in an unconventional application. The result is a savings in time of concrete pavement construction, which ultimately translates into a significant cost savings. Some interesting cause-and-effect relationships based on observations, 1 imi ted research, and construction of RCCP are presented. In particular these relationships help to identify some of the constraints as well as the guidelines for successful mix design, thickness design, and construction.

In the evaluation of new concepts or technology, judgment may frequently be inhibited by the assumption that unknown phenomena and factors play an important role in function and performance. This is true in many areas of science and engineering and it is true specifically in pavement technology. However, it is not always necessary to invoke new postulates; generally it is a question of recognizing or understanding how prevailing, known phenomena evolve or how the existing factors interact to cause success or failure. The purpose of this paper is to discuss roller-compacted concrete pavement (RCCP) as a new pavement technology by examining its components and the various stages through which the mixture must go to become an effective RCCP, which involves in large part what is already known of a broad area of materials and construction. In general terms, conventional concrete used in pavements is proportioned to satisfy a design flexural strength and maintain workability within a reasonable water-cement ratio. Other important factors considered in the mix design are durability and economy. Soil-cement is proportioned in large part for durability, with a water content to obtain maximum density as well as overall economy. RCCP mixtures cannot be designed totally as a conventional concrete mixture or as a soil-cement mixture but must be designed on the basis of key features of both these applications of cement in pavement construction. In addition, construction involves the use of asphalt equipment and techniques, which must be taken into consideration.