Concrete Basics - How To Do a Slump Test
On site, the accepted way to gauge and control water content is the slump test. To do the test properly, use a standard cone 12 inches high, 4 inches wide at the small end, and 8 inches wide at the big end. You fill the cone up about 1/3 full, rod it 25 times, fill it up to 2/3 full, rod it 25 more...