These are some of the most Frequently Asked Questions (FAQs) about Roadmaster Volumetric Mixers.
What is slump and why is it important?
Slump is a measure of concrete consistency with specific attention paid to the amount of water added to the concrete mix to increase ease of placement. In other words, the higher the slump, the wetter the mix. Adding water simply to increase slump will result in a loss of strength for the concrete and possibly surface erosion. Concrete should always be placed at a moderate slump — not more than 4 to 5 inches — unless a water-reducing admixture is used for strengthening purposes.
What are the recommended mix proportions for good concrete?
While good concrete can be produced using a wide range of mix proportions, a good general rule of thumb is the rule of 6s:
- A minimum cement content of 6 bags per cubic yard of concrete
- A maximum water content of 6 gallons per bag of cement
- A curing period that is a minimum of 6 days
- An air content of 6 percent