Roller-compacted concrete (RCC) gets its name from the heavy vibratory steel drum and rubber-tired rollers used to compact it into its final form. RCC has similar strength properties and consists of the same basic ingredients as conventional concrete—well-graded aggregates, cementitious materials, and water—but has different mixture proportions. The largest difference between RCC mixtures and conventional concrete mixtures is that RCC has a higher percentage of fine aggregates, which allows for tight packing and consolidation.
RCC pavements combine various aspects of conventional concrete pavement materials practices with some construction practices typical of asphalt pavements. However, while RCC pavements are compacted in the same manner and have similar aggregate gradation as asphalt pavements , the materials and structural performance properties of RCC are similar to those of conventional concrete pavement.
With well-graded aggregates, proper cement and water content, and dense compaction, RCC pavements can achieve strength properties equal to those of conventional concrete, with very low permeability
The production of RCC involves the following processes:
Selection of the most appropriate and economical material Materials inspection and establishing acceptance criteria
Storage of cementitious materials Proper storage of aggregates Temperature and dust control Segregation and moisture control
Quality control and acceptance plan
Establishing quality control plan Source checking and inventory control Periodic inspection of stored materials
Avoiding of segregation First in/first out Batching of different admixtures Temperature maintenance strategies
Selection of mixing plant capacity with respect to paving speed Quality, consistency, and uniformity of mixing On-line quality monitoring
Materials and machinery quality control/quality assurance
Regular calibration of plant equipment Concrete quality testing before dispatch Transportation equipment quality
Quantity Production consistency Speed
Transportation and throughput
Protecting concrete from excessive temperature rise and against wind, planning for moisture losses, etc.