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- W623724168 abstract "Drilled shaft refers to a deep foundation system where a single large diameter pier is used to replace a whole group of piles. Florida Department of Transportation (FDOT) specification 346-3.2 requires that the concrete used for the construction of drilled shaft should have a slump between 7 and 9 in. (180 and 230 mm) when placed and should maintain a slump of 4 in. (25 mm) or more throughout the concrete placement time. Furthermore, it requires that the mix for the slump loss test should be prepared at a temperature consistent with the highest ambient or initial concrete temperature (whichever is greater) expected during actual concrete placement. There is a prevalent feeling among many FDOT contractors that this requirement is not realistic and is too stringent. They feel that the temperature of concrete inside the drilled shaft is likely to be lower than the ambient or initial concrete temperature and hence slump loss would be less than the loss determined at the highest ambient or initial concrete temperature. Based on the above premise, this research study was conducted with the objective to establish profiles of concrete temperature in time from placement to hardening along depth as well as width within the shaft. For this purpose, three 4-ft (1.22-m) diameter and 25-ft (7.62-m) deep drilled shafts were constructed. Temperature probes connected with automatic data recorders were used to record the temperature of concrete inside the drilled shaft. Based on the gathered data, it was found that the temperature of concrete inside the drilled shaft was the same as the initial concrete temperature before placing at all locations. This finding leads to the conclusion that concrete temperature inside drilled shaft is not affected by ambient temperature and/or underground temperature conditions. Hence it is recommended that the initial concrete temperature should be used for the slump loss test and the corresponding FDOT specifications should be revised accordingly." @default.
- W623724168 created "2016-06-24" @default.
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- W623724168 date "2003-02-01" @default.
- W623724168 modified "2023-09-27" @default.
- W623724168 title "TEMPERATURE VARIATION IN DRILLED SHAFT CONCRETE AND ITS EFFECT ON SLUMP LOSS" @default.
- W623724168 hasPublicationYear "2003" @default.
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