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https://hdl.handle.net/11681/11234| Title: | Investigation of the Rapid Analysis Machine (RAM) for determining the cement content of fresh concrete |
| Authors: | Tom, Joe G. |
| Keywords: | Cement Cement content Concrete testing Rapid Analysis Machine Equipment Instruments |
| Publisher: | Structures Laboratory (U.S.) Engineer Research and Development Center (U.S.) |
| Series/Report no.: | Technical report (U.S. Army Engineer Waterways Experiment Station) ; SL-82-4. |
| Description: | Technical Report Abstract: The Rapid Analysis Machine (RAM) is a semiautomatic means of determining the cement content of freshly mixed concrete. Developed in England, the RAM incorporates the concepts of particle behavior as a function of size and mass in its determination of cement content. Five minutes after an 8-kg sample of concrete has been introduced into the RAM, the cement content can be determined from a set of calibration curves. A series of typical concrete field mixtures was used to evaluate the RAM. These mixtures had cement contents ranging from 300 to 1000 lb/yd³; several contained fly ash at a 30 percent replacement rate by volume, and one contained an admixture which entrained a total air content of 6 percent. The actual RAM unit evaluated could detect and determine the cement content to within ±12.3 percent of the original cement content. It was found that air-entrained concrete must be treated differently before testing to ensure that the results have not been affected by the entrained air bubbles. |
| Rights: | Approved for public release; distribution is unlimited. |
| URI: | http://hdl.handle.net/11681/11234 |
| Appears in Collections: | Technical Report |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| TR-SL-82-4.pdf | 5.4 MB | Adobe PDF |  View/Open |