This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1895 Excerpt: ...steamed after grinding, aerating is, in the Author"s experience, unnecessary. The following are the properties of cement to which it is recommended that engineering tests should be confined. 1. Fineness of grinding. 2. Tensile strength. 3. Freedom from risk of expansion, &c. Use of Slag in Cements.--As there are now several Portland cements manufactured partially from slag products, the properties of which have yet to be put to the proof, more particularly for marine works, it is recommended that for such materials chemical teats should be made to ascertain the quantity of sulphuric acid contained in the cement, and the effect upon it of exposure to sea-water. Concrete. In proportioning the constituents of concrete, the ratio of cement to sand, and of cement and sand to...