| Summary: | 碩士 === 國立中央大學 === 土木工程研究所 === 94 === This study is mainly discussing how the steam curing affects on the Alkali-Aggregate Reaction. Andesite from the coastal range and aggregate of Heping River were used in the trial of ASTM C227and ASTM C1293 via the progress of steam curing. The four factors were discussed on the affects of the Alkali-Aggregate Reaction: (1)alkali content; (2)steam curing; (3)constrained end; (4)delay period.
The result of this study is that both of the andesite from the coastal range and the Aggregate of Heping River have the potential to represent the Alkali-Aggregate Reaction. IF the percentage of alkali content is higher, the scale of expansion would be larger. If the concrete made by either andesite from the coastal range or the Aggregate of Heping River were treated with steam curing, the expansion in the early stage would be stimulated rapidly, and the expansion of the latter stage would be suspended, allowing the overall scale of expansion to be smaller than the non-steam cured specimen. On the other hand, there would be less crack and reactive gel in the specimen treated with steam curing. So it is obvious to conclude that the steam curing can effectively reduce the Alkali-Aggregate Reaction in concrete. By imitating the methods of making concrete in the pre-casting factories, that is, allowing the concrete along with the patterns to be treated with steam curing, the scale of expansion of the constrained end in the specimen would be smaller than the scale of expansion of the non-constrained end. And if the delay period of the steam curing is longer, the scale of expansion of the specimen would be smaller. In that way, the scale of expansion in the concrete structure induced by the Alkali-Aggregate Reaction would be reduced.
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