11G 



CEMENT AND CONCRETE 



d) Method and thoroness of mixing. 



e) The amount of water. 



f) Method and care of placing. 



g) Method of curing. 

 h) Age. 



108. Aggregates. As ordinarily employed, the term ag- 



FIG. 137. Gravel bank. 



gregates includes not only gravel or stone the coarse mate- 

 rial used but also the sand, or fine material, which is used 

 with the cement to form either mortar or concrete. Fine ag- 

 gregate is defined as any suitable material that will pass a No. 

 4 sieve or screen (having four meshes to the linear inch), and 



