Engineering and Contracting . follows: Since cu. yds. of sand will be used, cu. yds. of cement will be used, or cu. ft., and since a barrel of cement is cu. ft., the number of barrels of cement required is =, or say, barrels. 3 8 Cost of cement x = Cost of 1 cu. yd. pit run gravel Cost of screening cu. yd Cost of agsregate per cu. yd $ If the surplus sand must be paid for it willadd to the above the cost of cu. yd. sanddiscarded, or , making the cost of the ag-gregate for one cubic yard of concrete $ The cost of ag
Engineering and Contracting . follows: Since cu. yds. of sand will be used, cu. yds. of cement will be used, or cu. ft., and since a barrel of cement is cu. ft., the number of barrels of cement required is =, or say, barrels. 3 8 Cost of cement x = Cost of 1 cu. yd. pit run gravel Cost of screening cu. yd Cost of agsregate per cu. yd $ If the surplus sand must be paid for it willadd to the above the cost of cu. yd. sanddiscarded, or , making the cost of the ag-gregate for one cubic yard of concrete $ The cost of aggregates for a cubic yard ofconcrete when the percentage of sand is knownand when the mixture is 1:2:4, 1 :2% :5 or1:3:6 can be read from the diagram in , 4 and 5. These diagrams also give a curve of costswhen all material screened must be paid forand are used in the same manner as the curvesalready described which are given in Fig. 3. Cost When Stone is Added.—If crushedstone is available, it may be cheaper to add it. ^^j . /> 3^i 375 *25 Cost OF MATeei^LS foi? one cubic yapp of 13?& Concqbte Fig. 5. Curve for D*termining Cost of 1:3:6 Concrete. 475 The amount of stone needed is cu. y< 1 cu. yd. of the pit run gravel cu. yds. of stone, therefore, the amount screen is ^1,5 cu. yds. The amount to screen may also be deter-mined from the curve in hig. 2 as follows:Find at the left of the diagram the per centof sand in the pit run gravel and follow to theright to the curve marked (.iravel to screenand read at the bottom of the diagram thenumber of cubic yards to screen, which in thiscase is In like manner the number of cubic yardsto screen can be determined for any percentageof sanil. The curve holds good when theamount of coarse aggregate is specilicd to betwice the amount of sand, regardless of theamount of cement specified. The cost of the aggregate for a cnhic yardof concrete depends upon the cost of the pit-run gravel, the
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