Good concrete can be obtained by using a wide variety of mic proportions if proper mix design procedures are used . A good general rule to use is the

• 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 ( keeping concrete moist ) a minimum of 6 days , and
• AN air content of 6 percent ( if concrete will be subject to freezing and thawing ) .