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Performance of Low-Slump Underwater Concrete Incorporating Antiwashout Admixtures.
| 题名： | Performance of Low-Slump Underwater Concrete Incorporating Antiwashout Admixtures. |
| 作者： | Nakhla-Dina-Adel; Abou-Zeid-Mohamed-Nagib |
| 关键词： | ASTM-C1260; Aggregate-sources; Alkali-content; Alkali-silica-reactions; Cement-; Composition-Materials; Expansion-; Fine-aggregates; Fly-ash; Laboratory-tests; Test-procedures |
| 摘要： | This paper presents the results of a laboratory study conducted to determine the influence of cement composition on the expansions observed in standard and modified ASTM C1260 tests. Also, the effectiveness of selected mitigation measures for alkali-silica reactivity was studied by using a modified ASTM C1260 test. Two different cements with substantially different alkali levels were used in combination with a Class F fly ash and a Class C fly ash. The results obtained from tests with 89 different sources of fine aggregate were analyzed. The results from this study indicate that cement composition has a distinct influence on the expansion levels observed in the ASTM C1260 study. For a majority of the aggregates tested in this study (88%), the use of a specific cement low in alkali content resulted in higher expansion than a cement with a relatively higher alkali content, regardless of the level of reactivity of the aggregate in the standard ASTM C1260 tests. Class F fly ash was found to be more effective than Class C fly ash in reducing the expansions in the modified ASTM C1260 tests. However, the cement used in the mixture influenced the percent reduction in expansion offered by both Class F fly ash and Class C fly ash. The use of low-alkali cement with Class F and Class C fly ashes yielded larger reductions in percent expansion. |
| 总页数： | Transportation Research Record: Journal of the Transportation Research Board. 2005. (1914) pp53-60 (8 Fig., 2 Tab., 13 Ref.) |
| 报告类型： | 科技报告 |
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