Evaluation of Ultra-High Performance Concrete Connections

Evaluation of Ultra-High Performance Concrete Connections
Author:
Publisher:
Total Pages: 39
Release: 2022
Genre: Asphalt
ISBN:

Beginning in 2019, the U.S. Federal Highway Administration (FHWA) requested that TRB be directly involved in managing evaluations of selected projects undertaken by the agency. The TRB Cooperative Research Program's CRP Special Release 3: Evaluation of Ultra-High Performance Concrete Connections presents an evaluation of the UHPC Research and Development Program. UHPC is used in highway bridges, particularly for bridge-deck-level connections for prefabricated bridge elements.

Evaluation of Ultra-high Performance Concrete (UHPC) in Joints of Bridge Girders

Evaluation of Ultra-high Performance Concrete (UHPC) in Joints of Bridge Girders
Author: Saipavan Rallabhandhi
Publisher:
Total Pages: 146
Release: 2016
Genre: Bridges
ISBN:

"Joints are often considered as the weak link in a structure and often deterioration of the structure initiates from the joints. Joints transfer the stresses from super-structure to sub-structure and in this process are subjected to large transfer stresses. Not much attention is given to the design of joints as they are positioned in low moment regions and typically a 4 to 6 ksi (28 to 41 MPa) concrete is used to fill the joints. One of the solution to this problem is Ultra-high performance concrete (UHPC). In the recent past significant research has been done to use UHPC in deck-level connections and successful results were obtained. UHPC is a relatively new concrete material which not only has high compressive (18 ksi/124 MPa) and tensile strengths (5 ksi/35 MPa) with a very high chemical resistance, and durability. Use of steel fibers in UHPC helps increasing the service life. UHPC was successfully used by New York State and Iowa State Department of Transportations (DoT) in many bridges as various components, and proved to help with Accelerated Bridge Construction (ABC) which makes its use economical and time saving. This research focused on using UHPC as joint filler material along with High strength self-consolidating concrete (HS-SCC) while studying the effects of using different continuity details and effects of surface preparation of beam in a reinforced concrete section subjected to high-moment loading using 22 test specimens. An investigation of non-prestressed Missouri Department of Transportation (MoDoT) end girder detail using UHPC in the joint was also conducted. UHPC when used in the joints can be a viable solution making joints the stronger link holding the structure together"--Abstract, page iii.

Ultra-High Performance Concrete UHPC

Ultra-High Performance Concrete UHPC
Author: Ekkehard Fehling
Publisher: John Wiley & Sons
Total Pages: 198
Release: 2015-04-20
Genre: Technology & Engineering
ISBN: 3433030871

Selected chapters from the German concrete yearbook are now being published in the new English "Beton-Kalender Series" for the benefit of an international audience. Since it was founded in 1906, the Ernst & Sohn "Beton-Kalender" has been supporting developments in reinforced and prestressed concrete. The aim was to publish a yearbook to reflect progress in "ferro-concrete" structures until - as the book's first editor, Fritz von Emperger (1862-1942), expressed it - the "tempestuous development" in this form of construction came to an end. However, the "Beton-Kalender" quickly became the chosen work of reference for civil and structural engineers, and apart from the years 1945-1950 has been published annually ever since. Ultra high performance concrete (UHPC) is a milestone in concrete technology and application. It permits the construction of both more slender and more durable concrete structures with a prolonged service life and thus improved sustainability. This book is a comprehensive overview of UHPC - from the principles behind its production and its mechanical properties to design and detailing aspects. The focus is on the material behaviour of steel fibre-reinforced UHPC. Numerical modelling and detailing of the connections with reinforced concrete elements are featured as well. Numerous examples worldwide - bridges, columns, facades and roofs - are the basis for additional explanations about the benefits of UHPC and how it helps to realise several architectural requirements. The authors are extensively involved in the testing, design, construction and monitoring of UHPC structures. What they provide here is therefore a unique synopsis of the state of the art with a view to practical applications.

Ultra-High Performance Concrete: A State-Of-The-Art Report for the Bridge Community

Ultra-High Performance Concrete: A State-Of-The-Art Report for the Bridge Community
Author: U. S. Department of Transportation
Publisher: Lulu.com
Total Pages: 176
Release: 2016-01-14
Genre: Technology & Engineering
ISBN: 9781329831513

Ultra-high performance concrete (UHPC) is an advanced construction material that affords new opportunities for the future of the highway infrastructure. The Federal Highway Administration has been engaged in research on the optimal uses of UHPC in the highway bridge infrastructure since 2001 through its Bridge of the Future initiative. This report presents the state of the art in UHPC with regard to uses in the highway transportation infrastructure. Compiled from hundreds of references representing research, development, and deployment efforts around the world, this report provides a framework for gaining a deeper understanding of UHPC as well as a platform from which to increase the use of this class of advanced cementitious composite materials. This report will assist stakeholders, including State transportation departments, researchers, and design consultants, to grasp the capabilities of UHPC and thus use the material to address pressing needs in the highway transportation infrastructure.

Seismic Performance Evaluation of Precast Girders with Field-cast Ultra High Performance Concrete (UHPC) Connections

Seismic Performance Evaluation of Precast Girders with Field-cast Ultra High Performance Concrete (UHPC) Connections
Author: George C. Lee
Publisher:
Total Pages: 221
Release: 2014
Genre: Concrete beams
ISBN:

"Ultra-high performance concrete (UHPC) is an advanced cementitious composite material which provides new opportunities to significantly enhance the performance of field-cast connections. The use of UHPC in precast concrete bridge superstructure components can offer many advantages compared to conventional cast-in-place decks, especially higher quality and durability as well as ease of construction. However, the appropriate installation of connecting elements is a key challenge in completing the overall bridge system. It is recognized that the state of the practice with regard to deck-level connecting elements has been lacking in terms of resiliency and durability. The Federal Highway Administration's ongoing research program into the use of Ultra-High Performance Concrete (UHPC) in highway bridges has recently focused on deck-level connections between modular precast components. Field-cast UHPC connections can facilitate the construction of an emulative bridge deck system whose behaviors should meet or exceed those of a conventional cast-inplace bridge deck. However, many bridge owners may be hesitant to embrace UHPC bridge deck component technology due to a lack of knowledge of the seismic performance of field-cast UHPC connections. The seismic responses of connections under severe earthquakes need to be investigated to facilitate the wider use of these modular bridge deck systems, especially in high seismic zones. The major objective of this study is to evaluate the seismic performance of two precast deck-bulb-tee girders with field-cast UHPC connections. A series of shake table tests are performed to analyze the seismic behavior of the girders and UHPC connections"--Page v.

Evaluation of Ultra-high-performance Fiber-reinforced Concrete

Evaluation of Ultra-high-performance Fiber-reinforced Concrete
Author: Hamdi Celik Ozylidirim
Publisher:
Total Pages: 20
Release: 2011
Genre: Fiber-reinforced concrete
ISBN:

Recently, a new ultra-high-performance fiber-reinforced concrete (UHPC) was introduced into construction. The fibers in UHPC provide tensile capacity across cracks, resulting in high shear capacity in bending members. Typically, additional reinforcement for shear is not required. The Virginia Department of Transportation (VDOT) is experimenting with UHPC to determine the possibility of using it in transportation structures. The first bridge in Virginia to use UHPC beams was the bridge on Route 624 over Cat Point Creek in Richmond County. The specified minimum 28-day compressive strength was 23 ksi and the specified maximum water-cementitious material ratio was 0.2. UHPC with high strength and very low permeability was used in five beams in one of the 10 spans of the bridge. The purpose of this study was to evaluate the use of UHPC in the Route 624 Bridge. This was achieved by (1) observing the casting of UHPC beams; (2) evaluating the material properties of the UHPC; (3) testing a test beam to failure; (4) measuring strains in beams; and (5) noting any deck cracking. The results of the study indicated that the use of the UHPC led to very high strength and high durability attributable to a very low water-cementitious material ratio, low permeability, high resistance to cycles of freezing and thawing, and very tight cracks under load, all of which should provide for a much longer service life compared to the use of conventional concrete. However, because of the high cost of UHPC, more efficient shapes, design requirements, and material and construction specifications need to be developed to make UHPC practical for beams and other uses. The study recommends that UHPC be considered for use in closure pours and beams with optimized cross sections.

Designing and Building with UHPFRC

Designing and Building with UHPFRC
Author: Jacques Resplendino
Publisher: John Wiley & Sons
Total Pages: 678
Release: 2013-01-29
Genre: Technology & Engineering
ISBN: 1118587553

This book contains the proceedings of the international workshop “Designing and Building with Ultra-High Performance Fibre-Reinforced Concrete (UHPFRC): State of the Art and Development”, organized by AFGC, the French Association for Civil Engineering and French branch of fib, in Marseille (France), November 17-18, 2009. This workshop was focused on the experience of a lot of recent UHPFRC realizations. Through more than 50 papers, this book details the experience of many countries in UHPFRC construction and design, including projects from Japan, Germany, Australia, Austria, USA, Denmark, the Netherlands, Canada... and France. The projects are categorized as novel architectural solutions, new frontiers for bridges, new equipments and structural components, and extending the service life of structures. The last part presents major research results, durability and sustainability aspects, and the updated AFGC Recommendations on UHPFRC.