A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Evaluation of Ultra-High Performance Concrete Grout Performance under Longitudinal Shear
Precast pre-stressed adjacent box girders have become a preferred choice for constructing bridges of short to intermediate spans in several states. However, their shear keys often experience longitudinal cracks under a large number of load and thermal cycles. Ultra-high performance concrete (UHPC) has been recently proposed as an alternate grout material to fabricate shear keys that will not develop longitudinal cracks and enhance transverse load transfer between high strength concrete (HSC) girders. Due to the difference in the thermal expansion coefficients of HSC and UHPC, thermal cycles may induce longitudinal shear stresses at the interface between HSC and UHPC materials. The objective of the present research was to evaluate the performance of UHPC in shear keys using a longitudinal shear test to determine the cracking threshold and ultimate shear strength in the longitudinal direction. The test results showed that the average maximum shear capacity for the UHPC shear key exceeds that determined from past research for any other grout material and any shear key configuration. The enhanced shear strength of the UHPC shear key may have an impact on the analysis and design of UHPC connections in bridges to better withstand the thermal stresses between UHPC and HSC composite structures.
Evaluation of Ultra-High Performance Concrete Grout Performance under Longitudinal Shear
Precast pre-stressed adjacent box girders have become a preferred choice for constructing bridges of short to intermediate spans in several states. However, their shear keys often experience longitudinal cracks under a large number of load and thermal cycles. Ultra-high performance concrete (UHPC) has been recently proposed as an alternate grout material to fabricate shear keys that will not develop longitudinal cracks and enhance transverse load transfer between high strength concrete (HSC) girders. Due to the difference in the thermal expansion coefficients of HSC and UHPC, thermal cycles may induce longitudinal shear stresses at the interface between HSC and UHPC materials. The objective of the present research was to evaluate the performance of UHPC in shear keys using a longitudinal shear test to determine the cracking threshold and ultimate shear strength in the longitudinal direction. The test results showed that the average maximum shear capacity for the UHPC shear key exceeds that determined from past research for any other grout material and any shear key configuration. The enhanced shear strength of the UHPC shear key may have an impact on the analysis and design of UHPC connections in bridges to better withstand the thermal stresses between UHPC and HSC composite structures.
Evaluation of Ultra-High Performance Concrete Grout Performance under Longitudinal Shear
Hussein, Husam H. (author) / Sargand, Shad M. (author) / Al Rikabi, Fouad T. (author) / Steinberg, Eric P. (author)
First Congress on Technical Advancement ; 2017 ; Duluth, Minnesota
2017-09-07
Conference paper
Electronic Resource
English
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