(2019) Microprocessor Pressure Volume Controller, 18-SPR0-015, 2019. Transportation, Department of
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18_SPR0_015_Microprocessor_Pressure_Volume_Controller.pdf File Size:330kB |
Abstract
The Iowa Pore Index device is a key piece of test equipment for analyzing new sources for concrete stone for use in projects by the Iowa Department of Transportation (DOT), as well as other state DOT’s. The equipment was developed in the 1970’s, basic automation was added in the 1990’s, and the test was formalized by the American Association of State Highway Transportation Officials as a standard test (AASHTO TP 120-16). Recent research at the Iowa DOT, Iowa State University, and the Kansas Geological Survey has suggested that modification to the current Pore Index test procedure and apparatus may yield better information about the pore structure of aggregates. To study and implement the new procedures, the Pore Index controls needed to be upgraded with a microprocessor-controlled pressure volume controller (“controller”), which was achieved through this SP&R funding. This controller provides higher precision in measuring water intrusion. The new controller will also enhance the capability of the Iowa Pore Index test equipment and provide the bases of a new Iowa Pore Index test apparatus (see Figure 1 at the end of this report). This apparatus was tested through research titled: “Calibrating the Iowa Pore Index with Mercury Intrusion Porosimetry and Petrography – Phase II” (18-SPR0-010).
| Item Type: | Departmental Report |
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| Keywords: | aggregates; pores; petrography |
| Subjects: | Transportation Transportation > Materials Transportation > Research Transportation > Design and Construction |
| ID Code: | 52587 |
| Deposited By: | Iowa DOT Research |
| Deposited On: | 15 Apr 2025 13:55 |
| Last Modified: | 15 Apr 2025 13:55 |
| URI: | https://publications.iowa.gov/id/eprint/52587 |