PREFACE. THE object of this book is to present in a simple manner
those well-established principles of concreting which practice has
shown applicable to the manufacture of concrete blocks for building
hollow walls. The theoretical and technical questions which arise
in connec- tion with the industry are only considered in so far as
benefit may result to the operator in the actual manufacture of
blocks and their use in construction. The conclusions which have
been reached are the result not only of the authors experience in
actual work, but of a careful consideration of the successes and
failures of a large number of operators throughout a series of
years, supplemented by a careful weighing of the many articles
bearing on particular phases of the subject which have been
published in cement, engineering, and building magazines. To many
it will appear that this book is unduly critical. For this no
apology is offered. As the. industry grows much of the evil herein
criticised will pass away, and it is hoped that this work may, in
some measure, aid in giving to the weaknesses of the industry that
prominence which can alone secure their eradication, to the end
that concrete blocks may universally attain that high regard now
accorded in localities where they are manufactured by really able
hands. . As no allusion to patents is made in the text, the author
deems it but fair to here state that very many of the designs and
machines shown are protected by letters patent. To those
manufacturers whose ready cooperation has been both a powerful
stimulus and a substantial aid in the production of this work
grateful acknowledgment is rendered. To those who have so
generously furnished illustrations ofthe machines they make, and of
the buildings, blocks, and special members produced in machines or
molds of their manufacture, the authors thanks are due. This list
is as follows The Winget Concrete Machine Co., Columbus, Ohio,
Figs, n and 18 The Cement Working Machinery Co., Detroit, Michigan,
Fig. 44 Kells Foundry and Machine Co., Adrian, Michigan, Fig. 5
Miracle Pressed Stone Co., Minneapolis, Figs. 10, 13, 38, and 39 H.
S. Palmer Hollow Concrete Building Block Co., Washington, D. C.,
Figs. 3, 14, and 15 J. B. Prescott Son, Webster, Massa- chusetts,
Fig. 40 White Cement Machinery Co., Jackson, Michigan, Fig. 43 The
Hayden Automatic Block Machine Co., Columbus, Ohio, Figs. 17 and 34
Contractors Supply and Equipment Co., Chicago, Fig. i Municipal
Engineering Lnd Contracting Co., Chicago, Fig. 2 Ideal Concrete
Machinery Co., South Bend, Indiana, Figs. 28, 30, 31, and 35
Simpson Cement Mold Co., Columbus, Ohio, Fig. 45 The American
Hydraulic Stone Co., Denver, Colorado, Figs. 6, 7, 8, 9, 12, 19,
21, 23, 24, 25, 27, 29, 32, 33, 36, and 37 The Pettyjohn Co., Terre
Haute, Indiana, Figs. 16, 22, and 26 Concrete Block Machine Co.,
Auburn, Indiana, Fig. 4 Century Cement Machine Co., Rochester, New
York, Figs. 41 and 42 Chase Foundry and Manufacturing Co.,
Columbus, Ohio, Fig. 20. The frontis- piece is presented by
courtesy of The Cement Age, New York. HARMON HOWARD RICE. DENVER,
COLO., March 1906. Definition.. General theory Monolithic
construction Advantages of block construction. 3 History of
hydraulic cements Puzzolan cement Natural cement Portland cement
Processes of manufacture Testing cement Definition Sand. Gradation
of sizes Screenings Gravel and broken stone Cinders CONTENTS.
CHAPTERI. CONCRETE. CHAPTER II. CEMENT. CHAPTER III. AGGREGATE. vii
PAGE I 2 2 4 4 5 7 vni CONTENTS. CHAPTER IV. WATER. PAGE Purity 13
Quantity 13 Water in curing 14 In winter work 14 CHAPTER V. OTHER
INGREDIENTS...
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