CEMENTING MATERIALS IN SOIL 



99 



Fig. 29. Excessive checking of a heavy clay soil as a result of drying. Illus- 

 trates the process of soil granulation. 



the drying out of clay soil to a much greater depth than 

 is possible through surface evaporation. They also 

 interfere greatly with the advance of roots. 



39. Cementing material. The cohesion of a soil 



