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Water Damage Evaluation Of Concrete Infrastructure

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Water Damage Evaluation Of Concrete Infrastructure

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Title: Water Damage Evaluation Of Concrete Infrastructure
Author: Shakya, Roshan
Abstract: This study presents an experimental program to evaluate the effect of a special waterproofing material, International Chem-Crete Pavix (CCP), on the durability of concrete. The experimental program identified the concrete mix design commonly used for pavement and other infrastructure as set by Texas Department of Transportation (TXDOT). The tests conducted include the water absorption and air void (ASTM C 642), freeze-thaw (ASTM C 666), chloride penetration (ASTM C 1202), and petrographic (ASTM C 457) test. The tests were performed on both cored and laboratory treated and untreated specimens. The absorption test was performed on the concrete specimens with water cement ratio of either 0.35 or 0.5. The results of this test include percent absorption, specific gravity, and percent permeable void in the concrete. For freeze-thaw test, the optional length change test was performed. The test was performed for 300 freeze-thaw cycles. Measurement including length and weight were obtained for approximately every 50 cycles. Chloride ion permeability test was performed on two years old cored and 28 day cured laboratory prepared treated and untreated specimens. The test was conducted on the top 2 inch layer of the concrete specimens. The test result was shown in terms of charge passing, measured in coulombs, through a two inch section of concrete specimens. All tests were done by maintaining the potential difference of 60 volts DC for 6 hours across the ends of the specimens. For petrographic test, procedure A, linear-traverse method was performed. The test was performed on both cored and laboratory prepared treated and untreated specimens. The test result from the absorption test showed that the absorption capacity and permeable air void of the concrete specimens can be reduced by more than 50% with the application of waterproofing material. Freeze-thaw test results showed that the deterioration rate of untreated specimens is nearly double than that of treated specimens. The test results from chloride permeability test of both two years old cored and 28 days laboratory prepared specimens showed that the permeability is reduced significantly by the application of waterproofing material. The test results from the petrographic test showed that the application of waterproofing material has less effect on air void content and spacing factor of concrete. In general, the treated specimen performed superior to the untreated specimen.
URI: http://hdl.handle.net/10106/449
Date: 2007-08-23
External Link: https://www.uta.edu/ra/real/editprofile.php?onlyview=1&pid=958

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