Quality Concrete
on
Yosemite Valley
Railroad
ENGINEERS directing the concrete work for the new Yosemite Valley Railroad
bridge piers believe in the practical application of quality design and
control to meet job requirements.
After making a careful study of local aggregates, and determining water
ratios which would give the required strengths, a system of field experiments
was carried on to learn what mixes would give workability with greatest economy.
These experiments were based upon
laboratory principles of grading and proportioning the aggregates;
but many details of theory were modified in order to meet field conditions
as they actually existed on this particular job.
Strength tests, made regularly during the progress of the work, show that
specifications are being met fully, and with close uniformity.
For further information about quality control of concrete, write the nearest
office listed below. Ask for a copy of "Design and Control of Concrete Mixtures."
There is no obligation.
PORTLAND CEMENT ASSOCIATION
A National Organization to Improve and Extend the Uses of Concrete
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