Don't forget the sand, which is technically an aggregate[1]. Using the wrong san...

		spikels on March 24, 2015 \| parent \| context \| favorite \| on: China used more cement in 3 years than the U.S. di... Don't forget the sand, which is technically an aggregate[1]. Using the wrong sand is a classic mistake being rediscovered in China: http://www.wired.com/2013/03/poor-quality-chinese-concrete-c... [1]-The concrete recipes I remember always had sand and rocks, gravel and/or pebbles (depending on local availability)

Yes, you want coarsely crushed ('sharp') sand, not sand that has better decorative qualities.