Topics » Science & Technology   March 29, 2012

The Dos and Don'ts of Earthquake-Resistant Construction

Bad Sand

8 of 11

Bad BrickGood BrickBad GravelGood GravelHouses, Good and BadBad MasonryGood MasonryBad SandGood SandBad StoneGood Stone

Bad Sand

Sand is used for mixing concrete, mortar and in the foundation. The water in the cement mixture absorbs into the muddy sand before it has had time to absorb into the cement and create a good bond.