He effect of soluble salts on the corrosion process in sandstone.Studies of failed engineering structures have found that soluble salts can cause extensive breakdown to sandstone and cement structures. The mechanism for this failure is postulated pos·tu·late tr.v. pos·tu·lat·ed, pos·tu·lat·ing, pos·tu·lates 1. To make claim for; demand. 2. To assume or assert the truth, reality, or necessity of, especially as a basis of an argument. 3. to result from crystal growth pressures as evaporate minerals crystallize crys·tal·lize also crys·tal·ize v. crys·tal·lized also crys·tal·ized, crys·tal·liz·ing also crys·tal·iz·ing, crys·tal·liz·es also crys·tal·iz·es v.tr. 1. in the pores. This postulated mechanism, however, is inconsistent with the thermodynamic ther·mo·dy·nam·ic adj. 1. Characteristic of or resulting from the conversion of heat into other forms of energy. 2. Of or relating to thermodynamics. theory, as crystal precipitation and growth should occur in the most energetically favorable setting. We will test this hypothesis by examining the corrosion behavior of sandstone when it is constantly submerged in saline solutions (without crystal formation occurring). A number of tests will be performed in order to observe the potential effect of saline solutions on the dissolution of the sandstone matrix. The tests are performed on Jacobsville Sandstone that was acquired from a construction site in Marquette, Michigan Marquette is a city in the U.S. state of Michigan. As of the 2000 census, the city population was 19,661, with the a 2005 population estimate of 20,714. It is the county seat of Marquette County6. . A synthetic sea water, brine solution and de-ionized water will be used. Samples are placed in closed container containing one of the solutions. Samples are undergoing tests at room temperature, 90[degrees]C, and 200 [degrees]C. Degraded samples will be periodically examined in order to see the effects of salt corrosion and/or crystallization Crystallization The formation of a solid from a solution, melt, vapor, or a different solid phase. Crystallization from solution is an important industrial operation because of the large number of materials marketed as crystalline particles. . * Kuligowski, M. and D.J. Wronkiewicz. Department of Geological Sciences and Engineering, University of Missouri-Rolla. |
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