Drier Mix is Better
Adding water to the concrete makes it flow down the chute and fill your forms more easily, but it also weakens the final slab. A drier mix is more difficult to pack into your form, especially around the edges, but makes for a stronger, more crack-resistant slab.
Pour in Sections
Pour the concrete in small sections, spreading the concrete by moving the chute back and forth and by having the driver pull forward as you go. Once the truck has reached the end of a section, spread the concrete out evenly, and a touch higher than the form, with a concrete placer/rake. Don’t fill the whole form or giant sections because the mound of extra concrete you’ll drag back with the screed board will get too heavy.
Concrete Pouring Communication
Here are some basic hand signals to help you communicate with the truck driver. Make sure you can see the driver’s face in the side-view mirror—if you can’t see him, he can’t see you.