$o Fences, Walls and Hedges 



crete making, it is not necessary to repeat 

 them here. 



To vary the color and texture, employ 

 different kinds of sand and cement. A 

 white Portland cement with white sand 

 gives a very light wall, almost white, but 

 the difficulty is that white sand which is 

 usually from the beach is not sharp and 

 consequently not as strong. Yellow sand 

 with gray cement make a brown or brown- 

 ish gray wall and gray sand and gray 

 cement give a decided gray when set. As 

 wood forms are used to hold the concrete 

 until hard, the surface and joints of the 

 boards are left imprinted upon the surface 

 of the concrete. To avoid this, take down 

 the forms before the set is too hard and 

 scrape with a stiff wire brush. Pebbles 

 mixed in with sand and cement show an 

 interesting surface texture after scrap- 

 ing. 



While concrete has great crushing 

 strength and is able to resist great weights 

 placed upon it, in comparison it has little 

 tensile strength. It is well therefore to 

 provide this tensile strength by some other 

 material. Steel rods are usually employed 



