A Manual of Cement Testing by William Allyn Richards and Henry Briggs North was written for engineers and chemists in colleges and in the field. Published in New York by D. Van Nostrand Company in 1912, it combines physical testing with a separate treatment of chemical analysis.
Why consistent methods matter
The preface emphasizes that comparable results depend on performing a test in the same way under the same conditions. The authors aim to explain the standard methods and specifications used in their period with enough detail for students and field operators to learn consistent manipulations.
This makes the book useful beyond a list of apparatus. It connects the result of a test with the way the sample was prepared, mixed, stored and measured. A number has meaning only in relation to the procedure that produced it.
The introduction distinguishes experimental investigations from routine acceptance testing. The volume concentrates on the latter, while explaining the place of fineness, specific gravity, soundness, strength and setting time. Its standards are historical, but its organization is valuable evidence of the development of laboratory practice.
From classification to sampling
The first chapter introduces classification, composition and manufacture. Portland, natural, pozzuolana and mixed cements are distinguished, followed by the principal constituents and raw materials. Wet and dry preparation, kilns and grinding supply background for the later tests.
Sampling follows as a separate subject. Storage, collecting the sample and sample containers appear before the individual procedures. The sequence reminds the reader that a laboratory result cannot be separated from the material actually selected for examination.
For construction-history readers, these pages also help explain the language of older specifications. The names and classifications belong to the period in which the manual was written and should not be assumed to match every present-day product category.
Physical tests and their interpretation
Fineness and specific gravity each receive a chapter. The book describes apparatus, procedure, calculations and conclusions. Normal consistency, mixing and time of set follow, with the Vicat apparatus among the equipment discussed.
Constancy of volume is treated through normal and accelerated tests. Tensile strength, compressive strength and transverse tests then extend the examination into mechanical performance. Molds, briquettes, mixing, water quantities, breaking and calculations are included in the discussion.
The practical interest lies in seeing how many controlled steps stand behind a reported strength. The manual repeatedly links apparatus and handling with interpretation. It is especially useful when comparing historical test reports that might otherwise appear to provide directly interchangeable numbers.
Aggregates and laboratory equipment
A chapter on sand and stone covers mechanical analysis, loam, voids, effective size and the uniformity coefficient. These topics broaden the focus from the binder alone to the other materials that enter mortar and concrete.
The laboratory-equipment chapter gathers testing machines, clips, tools, scales, balances, boiling apparatus, storage arrangements and molds. Illustrations help identify the physical setup behind the written directions. This makes the volume relevant to the history of scientific instruments and engineering education as well as to cement manufacture.
The equipment discussion also shows why the procedures were specialized work. They required prepared specimens, suitable storage and measured loading or manipulation, rather than casual observation of an ordinary building mixture.
Chemical analysis and the limits of historical methods
The second part turns to chemical analysis and sample preparation. It includes loss on ignition and determinations of silica, iron and alumina, lime, magnesia, sulphur compounds, moisture, alkalies and carbon dioxide. Shorter sections address limestone, marl, slag and clay.
These chapters are a record of period analytical practice. Their reagents, apparatus and procedures require trained laboratory handling and should not be treated as a home experiment guide. Present-day testing decisions must use current methods and appropriate facilities.
Reading the scan
This free ebook suits materials historians, researchers studying engineering laboratories and readers interpreting older cement literature. The PDF has 189 digital pages, including preliminary matter and material beyond the main chapters. Searchable text is available, but recognition errors can affect formulas, tables and labels. The contents identify both parts and the tests within them; the scanned page remains the best reference for precise notation.
Book details
- Author: William Allyn Richards and Henry Briggs North
- Publisher: D. Van Nostrand Company, New York
- Year: 1912
- Edition: No numbered edition stated
- Digital length: 189 PDF pages
- Language: English
- File size: 10.10 MB
