Fred T. Hodgson · Frederick J. Drake and Co. · leaf 502
Pig. 44. 498 CEMENTS AND CONCRETES show that a 6-inch thickness of 1-2-4 concrete properlymade is waterproof up to about 50 pounds to the squareinch. This concrete is frequently used for facingdams. 1-3-6 is the proportion generally used for theinterior of dams and large structures. It is… … Fig. 45. makes good concrete, although it is about the limitof what is considered good work, and would not besuitable for very important structures. 1-5-10 is equalto any concrete made with natural cement. It is awell-known fact that the volume of concrete whenmixed with water is somewhat less than…
