ACI ASTM C138
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ACI ASTM C138 
ASTM C138 is utilized to determine the density (unit weight), yield, and air content (gravimetric) of 
concrete. 
A decrease in density may suggest several possibilities, including changes in materials (lower specific 
gravity), increased water content, higher air content, alterations in ingredient proportions, or reduced 
cement content. 
If the reduction in concrete density is attributed to an increase in air content, it may enhance the 
concrete's durability against fre...
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ACI ASTM C138 
ASTM C138 is utilized to determine the density (unit weight), yield, and air content (gravimetric) of 
concrete. 
A decrease in density may suggest several possibilities, including changes in materials (lower specific 
gravity), increased water content, higher air content, alterations in ingredient proportions, or reduced 
cement content. 
If the reduction in concrete density is attributed to an increase in air content, it may enhance the 
concrete's durability against fre...