UTMEXT OF AGRICULTURE. 



times. Concrete hardens rapidly, and should not stand long after the cement is 

 wet without being placed. The manner of handling is of great importance when 

 placing concrete, for the materials must not separate when poured, as good concrete 

 is obtained only when the stones and gravel remain in contact with the mortar. 

 Avoid pouring from a height on this account, and have the mixture wet enough to 

 be handled without breaking apart. To prevent cavities, place a layer about 1 foot 

 deep in the forms, and then tamp or puddle with a flat spade or sharpened board. 

 By working the spade along the sides of the form until the water rises on top a 

 smooth surface will be secured. The upper surface should be irregular to make 

 a stronger bond with the next layer, and if the second be poured before the previous 

 one has thoroughly set it will give additional strength. A little dry cement sprinkled 

 upon the surface before pouring is also a great aid in obtaining a good connection. 



MATEBIAL FOB OXE CTBIC YARD OF COXCBETE. 



Mixture 

 1-2-4. 



Mixture 



Barrels cement per cubic yard concrete 

 Cubic yards sand per cubic yard concrete . 

 Cubic yards stone per cubic yard concrete 



1.3 



0.42 

 0.84 



1.07 

 0.44 



o.ss 



PEB FOOT IN HEIGHT OF SILOS. 

 Mixture. 1 part cement 2% parts sand. 5 part? gravel. Wall. 6 inches thick. 



Diameter. 



Cement. 



Sand. 



Gravel. 



To determine the amount of material necessary for any silo, multiply the 

 figures given after the diameter by the desired height, thus: A silo 14 feet in 

 diameter and 30 feet high requires 



Cement 0.903 x 30 = 27.O9 barrels. 



Sand ".::7i! x ..o = n.iG cubic yards. 



Gravel 0.74 x 30 = __ 



Then multiply the amount of material by the prices. The above figures make 

 allowance for neither foundation nor floor, but the previous table will assist in 

 determining the cost of tht - 



WALL. 



The forms are first to be set in place, ready to receive concrete. The thickness 

 of wall should not be less than 6 inches, and the forms described are suited to this. 

 It is impossible to give very definite directions for the erection of staging when 

 elevating the forms. It sometimes will be wise to obtain the assistance of a 

 mechanic when commencing. Scaffolding is necessary, both inside and out to 

 support the forms. The sections when in place are bolted together as provided 

 for during their construction. This holds them rigid. The first section of the wall 

 will be built with the forms resting on the foundation, the inner one being barely 

 on the inner edge of the foundation, so that the inside wall of the silo will be 

 perpendicular from the bottom up. To keep the walls so throughout after the first 

 section has been laid, allow the forms to lap back on the solid concrete at least 



