74 



BULLETIN 724, U. S. DEPARTMENT OF AGRICULTURE. 



1 



t3'pe of road, and since it has already been described in the office pub- 

 lications on brick road construction, it will not be discussed further 

 here. 



COST OF CONCRETE FOUNDATIONS. 



In estimating the cost of a concrete foundation it is necessary to 

 consider the materials and the labor separately. Table 12 shows the 

 quantities of the different materials required to build 100 linear feet 

 of foundation 6 inches thick for the various proportions of mix ordi- 

 narily used in foundation construction. In preparing the table the 

 percentages of voids in the coarse aggi'egate have been assumed as 

 35 and 45, respectively, for well-graded gravel and average crushed 

 stone. The sand is assumed to be moderately well graded and each 

 barrel of cement is assumed to have a volume of 4 cubic feet. 



Table 12. — Sliowing quantities of materials required fori cuMc yard of concrete. 



PROPORTION. 





Sand. 



Coarse 

 aggre- 

 gate. 



Coarse aggregate to be well- 

 graded gravel or equivalent. 



Coarse aggregate to be average crashed 

 stone or equivalent. 



Cement. 



Cement. 



Sand. 



Coarse 

 aggre- 

 gate. 



Cement. 



Sand. 



Coarse 

 aggre- 

 gate. 



Width 

 (6 inches 

 thick). 



1 



2 



01 



4 

 5 



Barrels. 

 1.38 

 1.13 



Cu. yds. 



0.41 



.42 



Cu. yds. 



6.82 



.84 



Barrels. 

 1.51 

 1.24 



Cu. yds. 



0.45 



.46 



Cu. yds. 



0.90 



.92 



Feet. 



1 









QUANTITIES. 









f 23. 00 



6.83 



13. 67 



25.17 



7.50 



15.00 



9 









35. 78 



10.63 



21.26 



.39. 15 



11.67 



23. 34 



14 





2 



4 



\ 46. 89 



12.15 



24.30 



44.74 



13. 33 



26.67 



16 









46.00 



13. 67 



27. 33 



50.33 



15. 00 



30.00 



IS 









[ 51.11 



15.18 



30.37 



55. 93 



16.67 



33.33 



20 









f 18. 83 



7.00 



14.00 



20.67 



7.67 



15.33 



9 









29.30 



10.89 



21.78 



32.15 



11.93 



23.86 



14 





2\ 



5 



\ 33. 48 



12.44 



24.89 



36.74 



13.63 



27.26 



16 









37.67 



14.00 



28.00 



41.33 



15.33 



30.67 



18 









41.85 



15.55 



31.11 



45.93 



17.04 



34.08 



20 









f 17. 83 



7.83 



13.17 



19.33 



8.67 



14. 33 



9 









27.75 



12.19 



20:48 



30.08 



13.48 



22. .30 



14 





3 



5 



\ 31. 70 



13.93 



23. 41 



34.37 



. 15.41 



25.48 



16 









.35.67 



15. 67 



26.33 



38.67 



17.33 



28. 67 



18 









[ 39. 63 



17.41 



29.26 



42.96 



19.26 



31.85 



20 









f 16. 17 



7.17 



14.33 



17.67 



7.83 



15. 67 



9 









25. 15 



11.15 



22.30 



27.49 



12.19 



24.37 



14 





3 



6 



■• 28. 74 



13. 74 



47. 48 



31.41 



13.93 



27. 85 



16 









32.33 



14.33 



28. 67 



35.33 



15.67 



31.33 



18 









I 35. 93 



15.93 



71.86 



39.26 



17.41 



34.82 



20 





3 



7 



f 14.67 

 22.82 



i 26. 07 

 29.33 



I 32.59 



6. .50 

 10.11 

 11.56 

 13.00 

 14.44 



15. 17 

 23. 60 

 2a 96 

 30. 33 









9 











14 











16 











18 





33.70 









20 













PROPORTIONS. 



1 



8 

 3 

 3 



5 

 « 



7 



1.07 

 .97 



.88 



0.47 

 .13 

 .30 



0.79. 

 .86 

 ;91 



l.Ki 

 l.Ol) 



0. 52 

 .47 



0.86 

 .04 





1 





1 















