1. ACI 318. Manual of Concrete Practice Part 3: Building Code Requirements for Structural Concrete and Commentary,2005
2. ASTM C138. Standard Test Method for Unit Weight, Yield, and Air Content (Gravimetric) of Concrete,1992
3. ASTM C173. Air Content of Freshly Mixed Concrete by the Volumetric Method,1994
4. ASTM C231. Standard Test Method for Air Content of Freshly Mixed Concrete by the Pressure Method,1991
5. ASTM C457-98. Standard Test Method for Microscopical Determination of Parameters of the Air-void System in Hardened Concrete,2000