Flexible concrete link slabs used as expansion joints in bridge decks

Lárus Helgi Lárusson, Gregor Fischer

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Abstract

Deterioration of bridge structures with mechanical expansion joints between simply supported spans can cause repeated maintenance needs and high repair costs. Damage occurs due to accumulation of debris within the expansion joint, corrosion of deck reinforcement, spalling of concrete, leakage of water through the expansion joint and subsequent corrosion of girders and girder bearings. Investigations on joint-less superstructures using conventional steel reinforcement in so-called concrete link slabs indicate improved performance and economic feasibility. However, this concept requires relatively large amounts of steel reinforcement for crack control purposes and consequently provides a relatively large flexural stiffness and negative moment capacity at the joint between the spans. These contradicting requirements and effects in existing replacement concepts for damaged mechanical bridge joints are currently unresolved. In the proposed system described in this paper, a ductile cement-based composite section reinforced with Glass Fiber Reinforced Polymers (GFRP) replaces the damaged expansion joint. The combination of this ductile concrete together with corrosion resistant GFRP reinforcement serves as a flexible concrete element between the adjacent deck segments. The use of an Engineered Cementitious Composite (ECC) material instead of conventional concrete significantly reduces crack widths under service conditions and prevents deterioration of the link slab in the tension stiffening process.
Original languageEnglish
Title of host publicationProceedings of the 9th International Symposium on High Performance Concrete - Design, Verification & Utilization
Publication date2011
Publication statusPublished - 2011
EventThe 9th International Symposium on High Performance Concrete - Design, Verification & Utilization - Rotorua, New Zealand
Duration: 1 Jan 2011 → …
Conference number: 9

Conference

ConferenceThe 9th International Symposium on High Performance Concrete - Design, Verification & Utilization
Number9
CityRotorua, New Zealand
Period01/01/2011 → …

Cite this

Lárusson, L. H., & Fischer, G. (2011). Flexible concrete link slabs used as expansion joints in bridge decks. In Proceedings of the 9th International Symposium on High Performance Concrete - Design, Verification & Utilization