Overview of the proposed research.
PI: Tzuyang Yu (UMass Lowell)
Institution: University of Massachusetts Lowell (UML)
PI Email: Tzuyang_Yu@uml.eduPI Phone: 978-934-2288
Concrete highway bridges (reinforced and prestressed) are a major component in the U.S. transportation infrastructure. Their deterioration can occur in various damage mechanisms including:
As a result, concrete cracks and further damages are accelerated. One of the most critical challenges for the durability and life expansion of concrete highway bridges is crack identification. This is because the cracking of concrete structures can be attributed to one or many damage mechanisms. Detection and identification of surface and subsurface cracks in concrete bridges can provide state DOTs with critical information for repair and rehabilitation.
The problem we are trying to solve is the structural assessment of aging concrete bridges (reinforced and pre-stressed) in New England, targeting at concrete cracking and degradation (e.g., carbonation, alkali-silica reaction). The problem is important because that the integrity of concrete cover indicates not only mechanical strength of the cross section but also the level of protection for steel corrosion. Concrete cracking and steel corrosion can occur to any component in concrete bridges. We propose to:
This project aims to:
The findings developed from Tasks 1 and 2 will help us to complete the development of an EM database and to better characterize actual concrete cracks in the field.
The right figure (a) shows a series of processed GPR B-scan images for background subtraction, consisting of the following two steps:
Figure (b) shows the hyperbolic patterns of surface cracks with different geometries.
We also conducted field GPR tests on a concrete bridge with the result shown in the right figure. In the figure, our conclusions on the reduced GPR amplitude and an induced hyperbolic pattern representing the presence of a crack are confirmed.
Assoc. Professor TzuYang Yu, Ph.D., Department of Civil and Environmental Engineering
Ahmed AlZeyadi, Doctoral Candidate in Structural Engineering
Harsh Gandhi, Master's Student in Structural Engineering
Sanjana Vinayaka, Doctoral Student in Structural Engineering