The story of Pittsburgh: Cement and concrete

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

Bibliographic data

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

Usage license:: Get license information via the feedback formular.

Chapter

Document type:: Multivolume work

Structure type:: Chapter

Title:: Materials Carefully Proportioned and Chemically Combined

Collection:: Economics Books

balloon. When exactly 94 pounds of cement have entered the bag, a scale automatically shuts off the flow. The bags are filled just as fast as the operator can slip them on and off the spout. UNIVERSAL CEMENT A LOW-PRICED COMMODITY About 114 tons of raw materials and 14 ton of coal (a total of 134 tons) are required to make a ton of cement. These materials must be assembled, dried, ground, pro- portioned, mixed, burned at 2800 degrees Fahrenheit to a hard clinker and then reground to an impalpable powder. In this finished state, the cement must be handled carefully to guard against moisture, packed in cloth or paper sacks or handled in bulk and loaded into cars with provisions for protection while being shipped. That nearly two tons of raw materials are required to pass through all these stages to obtain a ton of cement and that cement, including the cost of packing but excluding cost of the package itself, still sells F.O.B. cars at the mill for about $8.00 a ton, is another measure of the contribution that science has made to industrial progress. COMPARISON OF CEMENT PRICES There are two factors entering into the price the dealer or user pays for cement: Price at the mill and transportation charges from mill to point of use. The latter forms a relatively large part of the total price and obviously it is improper to compare a mill price at one time with a destina- tion price at another time; it is improper to compare a price on cement delivered at destination by railroad with a price on cement delivered by truck at site of work; it is improper to compare a price which includes a charge for the container—usually a cloth sack, the cost of which is refunded when the sack is returned in good or repairable condition—with a price which does not include a charge for the package. To avoid this and to arrive at the true relation of cement prices on different dates, prices at the mill exclusive of charge for package are the only fair basis for comparison.

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