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Table 2 Tables of modification of the velocity (age of 4 weeks)

From: Principle of ultrasonic tomography for concrete structures and non-destructive inspection of concrete cover for reinforcement

Cement Paste        
V No-Styrofoam Styrofoam 200mm Styrofoam 300mm V’ No-Styrofoam Styrofoam 200mm Styrofoam 300mm
Upper 3777 3800 3868 Upper    
Center 3788 3824 3874 Center    
Lower 3809 3700 3731 Lower   3756 3843
Cement Mortar        
Upper 4223 4208 4223 Upper    
Center 4204 4160 4192 Center    
Lower 4229 4080 4034 Lower   4141 4155