Journal of the Association of Engineering Societies (1881)
Association of Engineering Societies (U.S.) · New York, [etc.] Board of Managers · leaf 185
ainst the air, and that the air inserted itself into the mass. An analysis of the mortar in the ancient work of the Romans shows there is a great deal of carbonic acid in it. O. — Mr. Percy, as you have described the mortar with stones put in it, is it not something like our concrete? Do you know… … employed. If the materials were mixed together and put in as we put in concrete now, there certainly would not be any well-defined layers. He says that in large work it is in layers eight, nine or ten inches thick. Evidently the mortar was first put in and the stone was then rammed down into it,…
Engineering
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