Reis

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Monograph

Identifikator:: 173388923X

URN:: urn:nbn:de:zbw-retromon-112001

Document type:: Monograph

Author:: Winkler, Hubert http://d-nb.info/gnd/117582093

Title:: Reis

Place of publication:: Hamburg

Publisher:: Dt. Auslandsverl. Bangert

Year of publication:: 1926

Scope:: VI, 138 Seiten; Ill.

Digitisation:: 2020

Collection:: Economics Books

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Document type:: Monograph

Structure type:: Chapter

Title:: IV. Schädlinge und Krankheiten

Collection:: Economics Books

The Story of Pittsburgh CEMENT anD CONCRETE % HILE it is strictly true that the present time is a “concrete age,” it is also true that concrete is by no means a modern discovery. The present extensive use is, however, a quite modern development. The word ‘‘concrete” comes from the Latin concretus, meaning “that which is grown together,” and artificial stone, similar to our concrete, was in use by the Babylon- ians and early Egyptians, as well as by the Greeks and the Romans. Pliny says the columns which adorn the peristyle of the Egyptian labyrinth were made of this material. “Puzzolana,” a volcanic earth, was used as a natural hydraulic cement by the Romans, who used it in building aqueducts, walls and roads. The pyramid of Ninus in the Eternal City was formed of a single block of this mate- rial. So also was the tomb of Porsena. which was 30 feet wide by 5 feet in height. While there are many ancient examples of the use of factitious stone, it is nevertheless, true in a very exact sense, that this is really the “concrete age.” Roads, bridges, houses, industrial buildings, railroad and mine construction, water-power developments, a variety of products such as drain tile, roofing tile, sewer pipe, building block and much ornamental work are of concrete. It is almost the only material used for sidewalks and for founda- tions of all structures including permanent pavements. Concrete is made of (a) sand or screenings, and (b) stone, pebbles or slag bound together into a hard, strong mass with (¢) portland cement, the strongest binder of such materials in commercial use. Concrete utilizes a variety of sands, slag, pebbles, crushed stones and other materials for construction work, provides an economical, permanent.

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