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- W568055690 abstract "Tufaceous material has been observed clogging pavement drains along highways in northeastern Ohio. Previous studies suggest that the free lime (CaO) present in subbase materials is the source for the deposition of the tufa. Nine slag samples which consisted of air cooled blast furnace (ACBF), open hearth (OF), basic oxygen furnace (BOF), and electric arc furnace (EAF) slags and two recycled portland cement concretes (RPCC) were evaluated for the tufa precipitate research. An X-ray, scanning electron microscope (SEM) and physicochemical tests were conducted on these samples. In addition, leachate study and surface area measurements were performed to characterize the precipitate potential of these samples. The results of these tests indicate that all of the slags, except the ACBF slag, are prone to produce tufa. The solution of CaO in hot ethylene glycol (sugar test) revealed that the ACBF slag does not contain any residual free lime. The results of the X-ray diffraction and thermogravimetric (TG) analyses confirmed that ACBF slag does not contain either portlandite or calcium carbonate. X-ray diffraction analysis for both the OH and the BOF slags shows that these slags contain portlandite Ca(OH)2 and calcium carbonate. The Ohio Department of Transportation requires six months aging of slags before they are used. The sugar test results show that the aging of slags for six months or more, does not decrease the free lime content enough to prevent the formation of tufa deposits. TG analyses and the results of the sugar test permit the determination of original percentage free lime. Five groups, according to the calculated total percent free lime are recognized: 1) 0%; 2) 3-5.5%; 3) 8-9%; 4) 10-12%; and 5) 24-25%. The TG and sugar test methods used are excellent and economical ways to characterize the original free lime in slags and the susceptibility of the slags to precipitate CaCO3 in subdrains of highways. The RPCC samples contain both portlandite and calcium carbonate. X-ray diffraction and SEM analyses indicate that one RPCC sample does not contain free lime. The leachate study shows that both samples produce tufa. Therefore, presence of free lime or portlandite in the cement paste of the concrete can result in tufa precipitation." @default.
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- W568055690 date "1993-11-01" @default.
- W568055690 modified "2023-09-27" @default.
- W568055690 title "PRECIPITATE POTENTIAL OF HIGHWAY SUBBASE AGGREGATES. FINAL REPORT" @default.
- W568055690 hasPublicationYear "1993" @default.
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