CONCRETE 



147 



The filling of the forms with concrete is known as pouring. 

 When pouring is in progress the forms should be watched 

 carefully for leaks and for any tendency to distort or give 

 way. 



Placing. If the mixing platform is near enough, the 

 concrete may be shoveled directly into place in the forms; 

 if not, it may be transported in wheelbarrows, slid down 



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Fig. 144. Fence-post gang-molds 



chutes, or hoisted in buckets. In any case the batches should 

 be mixed small enough so that the whole batch can be used 

 within thirty minutes, for cement mixtures take on their 

 initial set in about this length of time, and, if disturbed after- 

 ward, may never attain their full strength. If the batch has 

 been mixed with water over thirty minutes, no attempt 

 should be made to add more water and remix/ as this 



