4. Construction Considerations
• Need a good starting mixture design
– Good quality rock, good quality admixtures, fibers don’t
hurt, and maybe some sand
• Need proper delivered workability, so you can:
– Place to the desired density
– Too high it clogs, too low it ravels
– Cure quickly and sufficiently
– Pervious dries quickly; increased raveling potential
– Protect from damage caused by other construction traffic
and runoff during and after curing
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31. Construction Considerations
• Subgrade/subbase support RCC compaction
• Tilt drum, horizontal shaft, pugmill, etc. mixers
• Load into end-dump in thirds over length of box
• Wash frequently to avoid unloading problems
• COVER LOADS to avoid moisture loss
• 45 mins from initial water contact to paving hopper
– Transport time should be reduced if temperature above 80°F
(27°C)
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