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Experimental Study of Repair to Upgrade Concrete in Concrete Bridge Decks

Mottahed, Jaber | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42849 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Joghatae, Abdolreza
  7. Abstract:
  8. This study presents the experimental investigation, the effect of cement based chemical materials (Portland cement as a repair material No1. and 2 other cement base chemical materials) to upgrade the structural behavior of reinforced concrete slabs built with low quality (porous) concrete. The main issues focused in this investigation are: (i) the effect of repair on the flexural behavior of RC slabs in terms of ultimate capacity and ultimate mid-span deflection and ductility of specimens, (ii) the influence of repair materials on failure modes and (iii) evaluating the efficiency of different materials on decreasing the porosity of concrete by ultrasonic test. Because materials used in this study are cement base it is expectable to behavior same as base concrete that its result is better compatibility with base structure against external factors. Other advantages of the use of these materials are consideration of economical and construction aspects. A total of four reinforced concrete slabs (800x800x100 mm) have been tested. One specimen was used as reference. Three specimens were first tested with non-destructive technique (ultrasonic test), then repaired and finally tested again with ultrasonic device, then destructive test applied by an increasing concentrated load at its middle point. The experimental results confirmed that the ultimate capacity of the repaired specimens were increased and their porosity decreased in comparison with the reference specimen. The material NO3. among three materials shows the best results at all of the factors that has been evaluated.
  9. Keywords:
  10. Repairing ; Slabs ; Ultrasonic Test ; Cement Base Chemical Materials ; Low Quality Concrete

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