XIV TABLE OF CONTENTS. 



CHAPTER XX. 



SPECIFICATIONS FOR NATURAL CEMENTS. 



PAGE 



New York State Canals, 1896 278 



Rapid Transit Subway, New York City, 1900-1901 278 



Engineer Corps, United States Army, 1901 279 



American Society for Testing Materials, 1904 281 



Comparison of various specifications 282 



Definition 282 



Specific gravity 282 



Fineness 282 



Strength 283 



Product actually delivered 283 



CHAPTER XXI. 



HISTORY, STATISTICS AND PROSPECTS OF THE NATURAL-CEMENT INDUSTRY,, 



History of the industry 285 



Dates of establishment of various plants 288 



Statistics of the industry. 289 



Localization of the industry 289 



Production in 1901, 1902, and 1903, by states 290 



Total product in the United States, by years, 1818-1904. 291 



Prospects of the industry 292 



PART VI. PORTLAND CEMENT. 



CHAPTER XXII. 



PORTLAND CEMENT: PRELIMINARY STATEMENTS. 



Origin of the name "Portland" 294 



Present use of the term "Portland" 295 



Definition of Portland cement 297 



Composition and constitution 297 



General discussion 297 



Cementation Index. 298 



Silica-alumina ratio 299 



Raw materials available for Portland cement manufacture 300' 



Classification of raw materials by composition and properties 301 



Types of raw materials used 302 



Relative importance of various types 304 



Valuation of deposits of cement materials 304 



Factors involved 304 



Chemical composition 304 



Physical character 305 



Amount available. . . 305 



