Table 14. Volume of dry-rodded coarse aggregate 1 

 per unit of volume of concrete. 2 



Maximum size 











of aggregate 

 (in) 





Fineness 



modulus of sand 















2.40 



2.60 



2.80 



3.00 



3/8 



0.50 



0.48 



0.46 



Q.44 



1/2 



0.59 



0.57 



0.55 



0.53 



3/4 



0.66 



0.64 



0.62 



0.60 



1 



0.71 



0.69 



0.67 



0.65 



1 1/2 



0.75 



0.73 



0.71 



0.69 



2 



0.78 



0.76 



0.74 



0.72 



3 



0.82 



0.80 



0.78 



0.76 



6 



0.87 



0.85 



0.83 



0.81 



*As described in ASTM Standard C29. 

 2 ACI, 1979. 



Table 15, 



First estimate of weight 

 of fresh concrete. 1 



Maximum size 

 of aggregate 



Weight (lb/yd 3 ) 2 



Nonair- entrained 



Air-entrained 



(in) 



concrete 



concrete 



3/8 



3 840 



3 690 



1/2 



3 890 



3 760 



3/4 



3 960 



3 840 



1 



4 010 



3 900 



1 1/2 



4 070 



3 960 



2 



4 120 



4 000 



3 



4 160 



4 040 



6 



4 230 



4 120 



^CI, 1979. 



2 Values calculated for concrete of medium richness (550 lb of cement 

 per y 3 ) and medium slump with aggregate specific gravity of 2.7. 

 Water requirements based on values for 76- to 102-mm (5 to 4 inches) 

 slump in Tables 10 and 11. 



b. Curing. Curing is essential in the production of quality concrete. 

 The potential strength and durability of concrete will be fully developed only 



100 



