CONCRETE 157 



Concrete structures may be injured by removal of the 

 forms too soon. 



Concrete may be made practically water-tight by proper 

 methods of mixing. 



Steel and concrete form an economical combination. 



Sightly and permanent concrete construction can be 

 secured only by the use of standard cement, carefully 

 stored and thoroughly mixed in the proper proportions with 

 clear water free from alkali or acid, and well-graded, strong, 

 clean aggregate, carefully placed in strong, smooth forms 

 and protected from freezing, hot suns, and dry winds during 

 the process of hardening. 



BIBLIOGRAPHY 



Crane, E. C. "Cement and Its Use on the Farm," General Series 



Bulletin 52, University ot Minnesota, University Farm, St. Paul, 



Minn. 

 Merriman, Mansfield. American Civil Engineers Handbook. John 



Wiley & Sons. 

 Publications of: 



Northwestern Expanded Metal Co., Chicago. 



Portland Cement Association, Chicago. 



Trussed Concrete Steel Co., Detroit. 

 Seaton, Roy. Concrete Construction for the Rural Community. 



, McGraw-Hill. 

 Specifications for Cement. American Society for Testing Materials, 



Philadelphia. 

 Taylor, Frederick W., and Thompson, Sanford E. Treatise on 



Concrete, Plain and Reinforced. John Wiley & Sons. 

 Turneaure, Frederick E., and Maurer, Edward R. Principles of 



Reinforced Concrete Construction. John Wiley & Sons. 



GOVERNMENT publications 



Bulletins of the United States Department of Agriculture. 



