The story of Pittsburgh: Cement and concrete

Cement and concrete (Vol. 1, nr. 8)

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Multivolume work

Identifikator:: 1831622599

Document type:: Multivolume work

Title:: The story of Pittsburgh

Place of publication:: Pittsburgh

Publisher:: First National Bank

Year of publication:: 1919-1930

Collection:: Economics Books

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Volume

Identifikator:: 1831623277

URN:: urn:nbn:de:zbw-retromon-239793

Document type:: Volume

Title:: Cement and concrete

Volume count:: Vol. 1, nr. 8

Place of publication:: Pittsburgh

Publisher:: First National Bank

Year of publication:: 1921

Scope:: [ca. 18] Seiten

Digitisation:: 2022

Collection:: Economics Books

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Document type:: Multivolume work

Structure type:: Chapter

Title:: Universal Portland Cement Co.

Collection:: Economics Books

UNIVERSAL PORTLAND CEMENT CO. Just as the available supply of limestone and coal required to convert iron ore into pig iron for the manufac- ture of steel has contributed toward making the Pittsburgh District the world’s largest steel center, so has the available supply of the same materials enabled the Keystone State to take a leading position in the manufacture of cement. In the making of pig iron, one of the by-products is slag. For years, no wide uses for this were found. It was waste material. It cost money to get rid of it. But back in the 90’s, it was discovered that the silica, alumina and lime found in blast-furnace slag, the principal chemical ingre- dients required in the manufacture of portland cement, could be used to make this modern material, and today large quantities of granulated slag are used by the Universal Portland Cement Co. in the steel centers of Pittsburgh. Chicago and Duluth. INGREDIENTS OF PORTLAND CEMENT Portland Cement consists principally of silica, alumina and lime obtained from (a) cement rock and limestone; (b) clay or shale and limestone; (¢) clay and marl; or (d) blast-furnace slag and limestone. Any of these com- binations in various proportions provide the required chemical constituents for portland cement. The im- portant requisites for the manufacture of portland cement are: The cement mixture must be composed of properly proportioned materials. These raw materials must be finely ground and intimately mixed before burning. I'he burning must be conducted at the proper cemperature to obtain a chemical combination © ¢ burning, the resulting clinker must be finely

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