Test method and apparatus for determining the surface saturated dry condition of aggregates
US6568249B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 7, 2001 |
| Grant date | May 27, 2003 |
| Priority date | — |
| Expiry date | Aug 7, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/42
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for determining the saturated, surface dry (SSD) condition point of aggregates includes warm air-drying of a water saturated aggregate sample of known initial weight. The sample is rotated in an open mesh screened drum, and heated ambient air is passed radially through the drum and the sample to remove water. Initially surface water is removed, followed by pore water. The loss in water weight and the exit air relative humidity (EAH) is tracked by sensors and recorded. The EAH values change significantly at the SSD point. Following SSD point determination, the test procedure continues until all free water is removed from the sample to determine total moisture content of the sample.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.