Chicago : Engineering and Contracting Pub. Co. · leaf 132
often held that the use of fresh ce-ment is responsible for cracks in finishedwork. It is therefore of particular interest tonote that freshness cannot be held responsiblefor the changes shown here. Bar 85D wasmade from cement which had been stored inour laboratory for six months before use.Bar… … Fig. 2—Per Cent Contraction and Expansionof Neat Cement Bars When AlternatelyWet and Dry. (Closed circles refer to tars in water and opencircles to bars in air.) Bar 123B was made from a commercial ce-ment the day after it had been ground atthe mill, and 123J after it had been aged twoyears and six…
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