Chicago : Engineering and Contracting Pub. Co. · leaf 583
material is used 568 ENGINEERING & CONTRACTING Vol. XXXVI. No. 22. in practically all Cuban work. Briquette tests,made from time to time, indicated that, whenwashed so as to be reasonably free from clayand mixed with Portland cement, the tensilestrength is about 75 per cent of that of simi- not…
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