Look for roller compacted concrete (RCC) to begin competing regularly with asphalt for road construction projects. Roller compacted concrete for pavements is made by mixing crushed aggregate with cement and water in a pugmill.

PRECAUTIONS WHEN USING RCC FOR STREETS

RCC must be placed on a well-compacted subgrade or base course. If the subgrade is soft, RCC doesn't compact well and the lowered density reduces flexural strength. Longitudinal cold joints must be rolled carefully to achieve adequate compaction and prevent raveling. RCC at the edges of the lane being paved isn't compacted as well as interior material because it's not confined. An edging shoe can be used to improve edge density. Good curing is essential for strength development. Use curing compound but double the recommended application rate.

USE TEST STRIPS TO CHECK DESIGN AND CONSTRUCTION METHODS

Paving a test section before selecting final mix proportions is recommended. The test run helps workers to perfect their techniques and permits engineers to adjust the mix as needed.