Bone Dry

We are trying to use regular transit mixers to produce roller compacted concrete (RRC). Most of our markets do not have a central mixer available. We have developed a mix that discharges fairly well from a non-paving mixer. It has sand (39%), #67 limestone (10%), #8 pea gravel (48%), and Type C fly ash as a mineral filler (2%). The mix also has 300 pounds of cement, 100 pounds of Type C fly ash, and 18.5 gallons of water with a hydration stabilizer in the mix. The problem is how to prevent excessive buildup of this very dry mix. We are considering washing out the units every hour of production and then coating the mixer blades and drum with a hydration stabilizer. Any other suggestions on ways to minimize buildup on the mixer blades when dealing with this very dry mix? More

The bone-chilling cold weather that has impacted most of North America the last two months is proving to be no match for Epcon S7, a fast cure hybrid epoxy for concrete applications from ITW Red Head. More

Changes have occurred in testing floor dryness. More