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DETERMINATION OF ORIGINAL FREE LIME CONTENT OF WEATHERED IRON AND STEEL SLAGS BY THERMOGRAVIMETRIC ANALYSIS.
| 题名： | DETERMINATION OF ORIGINAL FREE LIME CONTENT OF WEATHERED IRON AND STEEL SLAGS BY THERMOGRAVIMETRIC ANALYSIS. |
| 作者： | Kneller-WA; Gupta-J; Borkowski-ML; Dollimore-D |
| 关键词： | IRON-AND-STEEL-INDUSTRY; SLAGS-; SUBBASE-MATERIALS; LIME-; CALCIUM-CARBONATE; CLOGGING-; SUBDRAINS-; THERMOGRAVIMETRY-; CALCIUM-OXIDES; BLAST-FURNACE-SLAG; TUFA- |
| 摘要： | Iron and steel slags are often used as subbase materials in the construction of highways. Previous studies have suggested that the free lime (CaO) in these subbases is responsible for the deposition of calcium carbonate (tufa) in many highway drains. Clogging of these drains leads to the deterioration of highways. Previous work has shown that if the total original CaO in slags exceeds 1%, the slags will readily produce tufa. Therefore, to classify the tufa-producing potential of these slags, it is necessary to determine the total original CaO. Thermogravimetry (TG) methods were employed and most of the TG plots indicated two major changes in weight loss--dehydroxylation of Ca(OH)2 and dissociation of carbonates. From these changes in weight loss the percentage of CaO was calculated. These calculated percentages of CaO from the TG plot plus the results from the "sugar test" determine the total original percentage of CaO. Five groups are recognized according to the calculated total percentage of CaO: 0%, 3.5 to 5%, 8 to 9%, 10 to 12%, and 24 to 25%. Air-cooled blast furnace slag (0% CaO) is the only slag that should be used as a subbase in highway construction, whereas all others are considered to be harmful and could lead to the formation of tufa. TG methods and the sugar test are excellent and economical ways to characterize the original CaO in slags and the susceptibility of the slags to precipitate CaCO3 in subdrains of highways. |
| 总页数： | Transportation Research Record. 1994. (1434) pp17-22 (1 Fig., 6 Tab., 12 Ref.) |
| 报告类型： | 科技报告 |
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