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{
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"fromtitle": "Main Page",
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"totitle": "Iowa Pore Index",
"*": "<tr><td colspan=\"2\" class=\"diff-lineno\" id=\"mw-diff-left-l1\" >Line 1:</td>\n<td colspan=\"2\" class=\"diff-lineno\">Line 1:</td></tr>\n<tr><td class='diff-marker'>\u2212</td><td class='diff-deletedline'><div><del class=\"diffchange diffchange-inline\"><strong>MediaWiki has been installed</del>.<del class=\"diffchange diffchange-inline\"></strong></del></div></td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\">=MDOT Iowa Pore Index Device Instructions=</ins></div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\">[[File:MDOT_pore_index_device</ins>.<ins class=\"diffchange diffchange-inline\">JPG|thumb|center]]</ins></div></td></tr>\n<tr><td class='diff-marker'> </td><td class='diff-context'></td><td class='diff-marker'> </td><td class='diff-context'></td></tr>\n<tr><td class='diff-marker'>\u2212</td><td class='diff-deletedline'><div><del class=\"diffchange diffchange-inline\">Consult the [https://www.mediawiki</del>.<del class=\"diffchange diffchange-inline\">org/wiki/Special:MyLanguage/Help:Contents User's Guide] for information on using </del>the <del class=\"diffchange diffchange-inline\">wiki software</del>.</div></td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\">==Introduction==</ins></div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\">MDOT commissioned design and construction of a custom device for performing Iowa Pore Index testing of carbonate aggregate</ins>. <ins class=\"diffchange diffchange-inline\">The device has automated much of </ins>the <ins class=\"diffchange diffchange-inline\">test, requiring minimal user interaction</ins>.</div></td></tr>\n<tr><td class='diff-marker'> </td><td class='diff-context'></td><td class='diff-marker'> </td><td class='diff-context'></td></tr>\n<tr><td class='diff-marker'>\u2212</td><td class='diff-deletedline'><div>== <del class=\"diffchange diffchange-inline\">Getting started </del>==</div></td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\">These instructions cover use of the device.</ins></div></td></tr>\n<tr><td class='diff-marker'>\u2212</td><td class='diff-deletedline'><div><del class=\"diffchange diffchange-inline\">* [https://www</del>.<del class=\"diffchange diffchange-inline\">mediawiki</del>.<del class=\"diffchange diffchange-inline\">org</del>/<del class=\"diffchange diffchange-inline\">wiki</del>/<del class=\"diffchange diffchange-inline\">Special:MyLanguage</del>/<del class=\"diffchange diffchange-inline\">Manual</del>:<del class=\"diffchange diffchange-inline\">Configuration_settings Configuration settings list]</del></div></td><td class='diff-marker'>+</td><td class='diff-addedline'><div> </div></td></tr>\n<tr><td class='diff-marker'>\u2212</td><td class='diff-deletedline'><div><del class=\"diffchange diffchange-inline\">* [https</del>://<del class=\"diffchange diffchange-inline\">www</del>.<del class=\"diffchange diffchange-inline\">mediawiki</del>.<del class=\"diffchange diffchange-inline\">org</del>/<del class=\"diffchange diffchange-inline\">wiki</del>/<del class=\"diffchange diffchange-inline\">Special:MyLanguage/Manual:FAQ MediaWiki FAQ]</del></div></td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\">No standard method for this test has been established.</ins></div></td></tr>\n<tr><td class='diff-marker'>\u2212</td><td class='diff-deletedline'><div><del class=\"diffchange diffchange-inline\">* [https:</del>//<del class=\"diffchange diffchange-inline\">lists</del>.<del class=\"diffchange diffchange-inline\">wikimedia</del>.<del class=\"diffchange diffchange-inline\">org</del>/<del class=\"diffchange diffchange-inline\">mailman</del>/<del class=\"diffchange diffchange-inline\">listinfo</del>/<del class=\"diffchange diffchange-inline\">mediawiki</del>-<del class=\"diffchange diffchange-inline\">announce MediaWiki release mailing list]</del></div></td><td class='diff-marker'>+</td><td class='diff-addedline'><div> </div></td></tr>\n<tr><td class='diff-marker'>\u2212</td><td class='diff-deletedline'><div><del class=\"diffchange diffchange-inline\">* [https</del>://<del class=\"diffchange diffchange-inline\">www.mediawiki.org</del>/<del class=\"diffchange diffchange-inline\">wiki</del>/<del class=\"diffchange diffchange-inline\">Special</del>:<del class=\"diffchange diffchange-inline\">MyLanguage/Localisation#Translation_resources Localise MediaWiki for your language]</del></div></td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\">==Importance of Test==</ins></div></td></tr>\n<tr><td class='diff-marker'>\u2212</td><td class='diff-deletedline'><div>* <del class=\"diffchange diffchange-inline\">[https:</del>//<del class=\"diffchange diffchange-inline\">www.mediawiki.org</del>/<del class=\"diffchange diffchange-inline\">wiki/Special:MyLanguage</del>/<del class=\"diffchange diffchange-inline\">Manual:Combating_spam Learn how to combat spam on your wiki]</del></div></td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\">The Iowa Pore Index is a measure of the capacity of a carbonate aggregate to absorb water. A known mass of carbonate aggregate is immersed in water. Air pressure is applied and the amount of water pushed into aggregate pores is measured after 60 seconds and again after 15 minutes. The volumes are corrected for expansion and trapped air in the measuring system, producing two values; the Primary Load and the Secondary Load. Experience has demonstrated that these values are related to the durability of the aggregate and the development of "D" cracking in concrete pavements.</ins></div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div> </div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\">==Methodology==</ins></div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\">The device requires measurement of expansion and trapped air prior to performing the first test of the day. This is performed by running a test with a dense and impervious aggregate proxy (e.g. glass marbles) and recording Primary and Secondary volume changes.</ins></div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div> </div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\">A known mass of carbonate aggregate is placed in the pressure chamber of the device and the chamber's lid is secured in place. The device is programmed to purge the system with water, during which time the operator manipulates the pressure chamber so as to remove as much air as possible. Following purging, the operator adjusts the water level, records the initial volumes from the sight glasses, and continues the test. The device will automatically apply air pressure and isolate the primary and secondary sight glasses at the appropriate times, allowing the operator to perform other functions while the test is performed. At the conclusion of the test, the operator records the final volumes from the sight glasses and drains the system.</ins></div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div> </div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div>==<ins class=\"diffchange diffchange-inline\">Instructions</ins>==</div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div> </div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\">===Expansion and Entrapped Air Correction===</ins></div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\">Prior to performing the first test with aggregate for the day, determine system expansion correction by running the test with 5 kg of an impervious and dense aggregate proxy (e.g</ins>. <ins class=\"diffchange diffchange-inline\">glass marbles)</ins>. <ins class=\"diffchange diffchange-inline\">Calculate the volume changes:</ins></div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div> </div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\">::P<sub>corr<</ins>/<ins class=\"diffchange diffchange-inline\">sub> = P<sub>f<</ins>/<ins class=\"diffchange diffchange-inline\">sub> - P<sub>i<</ins>/<ins class=\"diffchange diffchange-inline\">sub></ins></div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div> </div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div>::<ins class=\"diffchange diffchange-inline\">S<sub>corr</sub> = S<sub>f<</ins>/<ins class=\"diffchange diffchange-inline\">sub> - S<sub>i<</ins>/<ins class=\"diffchange diffchange-inline\">sub></ins></div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div> </div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\">===Performing a Test===</ins></div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\">#Weigh approximately 5 kg of the material to test, recording weight to the nearest 0.1 gram as W.</ins></div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\">#Place the material into the pressure chamber and tip the chamber so that space is created for the down-pipe in the chamber's cover.</ins></div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\">#Place the cover on the chamber and seal in place, tightening all four wingnuts.</ins></div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\">#Insure that the air and water supplies are attached to the device and turned on</ins>. <ins class=\"diffchange diffchange-inline\">Ensure the drain and vent lines are secured in an appropriate drain</ins>.</div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\">#Start the test; the device will start water flowing into the system.</ins></div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\">#While filling with water, rock the chamber or beat it with a rubber mallet to dislodge and remove air from the chamber and aggregate.</ins></div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\">#Three short beeps will sound when the device has been purged with water. Adjust the water level in the sight glasses as required by pulsing the water or drain valves.</ins></div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\">#Click "Continue". The device will prompt to record levels.</ins></div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\">#Record the the level in the primary sight glass as P<sub>i<</ins>/<ins class=\"diffchange diffchange-inline\">sub> and the level in the secondary secondary sight glass as S<sub>i<</ins>/<ins class=\"diffchange diffchange-inline\">sub>.</ins></div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\">#Select "Continue". The device will automatically adjust valves and apply air pressure. The remainder of the test can be performed unattended and will conclude in 15 minutes.</ins></div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\">#Five long beeps will sound at the conclusion of the test. A prompt will appear to record levels.</ins></div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\">#Record the level in the primary sight glass as P<sub>f<</ins>/<ins class=\"diffchange diffchange-inline\">sub> and the level in the secondary sight glass as S<sub>f<</ins>/<ins class=\"diffchange diffchange-inline\">sub></ins>.</div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\">#Click "Continue".</ins></div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\">#Click "Drain System" to initiate draining.</ins></div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\"># Remove the cover from the pressure chamber.</ins></div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\">#Remove the wet aggregate from the chamber</ins>.</div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\"><strong>*To minimize corrosion, the chamber should be left open and dry when not in use.<</ins>/<ins class=\"diffchange diffchange-inline\">strong></ins></div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\">#The corrected volume changes are calculated for both primary and secondary loads:</ins></div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\">::V<sub>P</sub> = P<sub>f<</ins>/<ins class=\"diffchange diffchange-inline\">sub> - P<sub>i<</ins>/<ins class=\"diffchange diffchange-inline\">sub> </ins>- <ins class=\"diffchange diffchange-inline\">P<sub>corr</sub></ins></div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div>:<ins class=\"diffchange diffchange-inline\">:V<sub>S<</ins>/<ins class=\"diffchange diffchange-inline\">sub> = S<sub>f<</ins>/<ins class=\"diffchange diffchange-inline\">sub> - S<sub>i<</ins>/<ins class=\"diffchange diffchange-inline\">sub> - S<sub>corr<</ins>/<ins class=\"diffchange diffchange-inline\">sub></ins></div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div> </div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\">===Calculating Pore Index===</ins></div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\">Primary Pore Index</ins>:</div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div> </div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\">P = 9000 </ins>* <ins class=\"diffchange diffchange-inline\">V<sub>P<</ins>/<ins class=\"diffchange diffchange-inline\">sub> </ins>/ <ins class=\"diffchange diffchange-inline\">W</ins></div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div> </div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\">Secondary Pore Index:</ins></div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div> </div></td></tr>\n<tr><td colspan=\"2\"> </td><td class='diff-marker'>+</td><td class='diff-addedline'><div><ins class=\"diffchange diffchange-inline\">S = 9000 * V<sub>S<</ins>/<ins class=\"diffchange diffchange-inline\">sub> </ins>/ <ins class=\"diffchange diffchange-inline\">W</ins></div></td></tr>\n"
}
}