Date of Award
Master of Science (MS)
This thesis investigates the use of a Latex Modified Concrete (LMC) overlay to increase the strength of prestressed channel girders and enhance their ability to distribute load. The research conducted in this thesis involved material testing of several different LMC mixes and flexural testing of an LMC overlay and girder system. The material testing was used to determine a reasonable LMC mix design and surface preparation method to be used for the overlay. Based on material testing it was concluded that a rapid-set mix and pressure washing of the girder surfaces were a reasonable mix design and surface preparation for the overlay construction. Both the material and flexural testing showcased a sufficient bond between the overlay and existing girders under service loads, implying that LMC overlays do not require as invasive surface preparation methods to be structurally effective. However, flexural testing found the overlay delaminated prior to ultimate failure, indicating a stronger bond is required for the overlay to increase flexural capacity. The flexural testing did determine that the LMC overlay increased the ability of the girder system to distribute load, especially when combined with transverse post-tensioning. Overall, the outcomes of the laboratory testing conducted for this thesis indicate LMC overlays are a promising option for bridge repair, rehabilitation, and strengthening.
Dodd, Samuel, "Effect of Latex Modified Concrete Overlays With Reduced Surface Preparation on the Load Distribution and Flexural Strength of Channel Girders" (2023). All Theses. 4192.