01764440

Component

https://annualmeeting.myt...nlineProgram/Details/15808

A number of in-service bridges need retrofitting or repair which is an economical alternative to new construction. Existing retrofit methodologies exhibit early signs of deterioration or undesired failure modes which may severely affect the retrofitted concrete member’s serviceable life. To this aim, new advanced materials are required which append the structural strength and improve the durability characteristics of the member. Ultra-high performance concrete (UHPC) has excellent mechanical properties and rheological characteristics similar to concrete, allowing easy use for retrofitting deteriorated bridge elements such as beams and girders. Also, lower porosity and compact microstructure provides an external protective layer. In this paper, an experimental program is devised for retrofitting UHPC beams using different damage indices and surface preparation techniques. The beams were retrofitted only in segments where controlled artificial damages were introduced. The results show that the retrofitted beams using sandblasting or mechanical connectors exhibit improved structural behavior. To complement the study, a brief numerical work is presented to comprehend the effect of various configurations of retrofitting. At the conclusion, a design example is presented which offers designers a framework for calculating the enhancement of structural strength using UHPC.

This paper was sponsored by TRB committee AKB30 Standing Committee on Concrete Bridges.

TRBAM-21-03744

English

20p

2021

Transportation Research Board 100th Annual Meeting

Digital/other

Figures; Photos; References; Tables

Beams; Bond strength (Materials); Rehabilitation; Reinforced concrete bridges; Retrofitting; Surface preparation; Ultra high performance concrete

Bridges and other structures; Highways; Maintenance and Preservation; Materials

Transportation Research Board Annual Meeting 2021 Paper #TRBAM-21-03744

TRIS, TRB, ATRI

Dec 23 2020 11:05AM