Investigation of the Bond Behavior of UHPC

2014 ◽  
Vol 617 ◽  
pp. 225-228 ◽  
Author(s):  
David Čítek ◽  
Petr Huňka ◽  
Stanislav Řeháček ◽  
Jiří Kolísko
Keyword(s):  
Experimental Research ◽  
High Performance ◽  
High Performance Concrete ◽  
Anchorage Length ◽  
Bond Behavior ◽  
Ordinary Concrete ◽  
Pull Out ◽  
Prestressed Girders ◽  
Average Shear ◽  
Prestressing Strands

Ultra High Performance Concrete - UHPC has become increasingly used. Its outstanding features are generally known. It is a fact that the bond of the reinfocement in UHPC is better than that in ordinary concrete, but this bond needs to be quantified .The aim of the experimental research was to determine the average bond stress between prestressing strands and different types of UHPC and to show very significant increase in the average shear stress in bond with UHPC compared to ordinary concrete. In order to determine the bond capacity, an experimental research was carried out. Experimental details of the models in real structures – parts of prestressed girders made from UHPC, were tested in the laboratory and the results were compared with specimens prepared according to standard. The influence of different material properties and different anchorage length of prestressing strands to bond behavior of UHPC was examined in pull out tests. Test results of bond test led to the conclusion that the application of UHPC can significantly reduce the anchorage length of reinforcement compared with the ordinary concrete.

Assessment of Bond Behavior of UHPC and Prestressing Strands

2014 ◽  
Vol 1000 ◽  
pp. 247-250 ◽  
Author(s):  
David Čítek ◽  
Jan L. Vítek ◽  
Jiří Kolísko ◽  
Petr Huňka ◽  
Stanislav Řeháček
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Tensile Force ◽  
Bond Stress ◽  
Bond Behavior ◽  
Ordinary Concrete ◽  
Pull Out ◽  
High Durability ◽  
Prestressing Strands ◽  
Average Bond

Ultra High Performance Concrete - UHPC is a relatively new type of composite material with outstanding features (high compressive strength, high tensile strength and high durability). Also the bond strength between steel reinforcement and UHPC is better than that in ordinary concrete. This fact needs to be quantified, because no standard prescribes the bond behavior of UHPC and design of UHPC in general. The main aim of the experimental research was to determine the average bond stress between prestressing strands and different types of UHPC. The second aim was to show very significant increase of the average shear stress in bond of UHPC compared to that of ordinary concrete. In order to determine the bond capacity, two types of experimental specimens – parts of prestressed girders and specimens prepared according to standard, were tested in the laboratory. The specimens were prepared for pull out test, in which the prestressing strand is pulled out from the cube or part of girder made from UHPC. The tensile force in strand and slip of the end of reinforcement were measured and then the average bond stress was examined. The influence of different material properties and different anchorage lengths of prestressing strands to bond behavior of UHPC was examined and results were compared to these phenomena of ordinary concrete. The results of bond test led to the conclusion that the application of UHPC can significantly reduce the anchorage length of reinforcement compared with that in ordinary concrete.

Testing of Bond Behavior of UHPC

2014 ◽  
Vol 1054 ◽  
pp. 95-98 ◽  
Author(s):  
David Čítek ◽  
Petr Huňka ◽  
Stanislav Řeháček ◽  
Tomáš Mandlík ◽  
Jiří Kolísko
Keyword(s):  
Material Properties ◽  
High Performance ◽  
High Performance Concrete ◽  
Bond Stress ◽  
Ultra High Performance Concrete ◽  
Bond Behaviour ◽  
Bond Behavior ◽  
Ordinary Concrete ◽  
Pull Out ◽  
Different Types

Outstanding features of UHPC - Ultra High Performance Concrete are generally known. It has become increasingly used worldwide. For a better understanding of the material some features like the bond of reinforcement and UHPC has to be quantified. Research is focused on determination the bond stress between two types of the reinforcement (prestressing strands and bars) and different types of UHPC. Main goal of the research is to show significant increase in the shear stress in bond of UHPC compared to ordinary concrete. For evaluation of the bond stress the pull-out test were carried out. Specimens were prepared according to standard and tested in the laboratory. The influence of different material properties and different anchorage length of reinforcement to bond behaviour was examined.

Study on the transfer and anchorage length of steel strand in ultra high performance concrete material

2020 ◽  
Vol 10 (2) ◽  
pp. 153-164
Author(s):  
Hui Zheng ◽  
Dongdong Zhou ◽  
Xinfeng Yin ◽  
Lei Wang
Keyword(s):  
Bond Strength ◽  
High Performance ◽  
Failure Modes ◽  
High Performance Concrete ◽  
Protective Layer ◽  
Experimental Results ◽  
Ultra High Performance Concrete ◽  
Anchorage Length ◽  
Pull Out ◽  
Steel Strand

Ultra-high-performance concrete (UHPC) material, a new type of cement-based composite material, is usually employed in the bridge engineering. The transfer and anchorage length of steel strand in UHPC material is different from that in ordinary concrete; nevertheless, few design standards are found that how to anchor the transfer and anchoring length of steel strand in UHPC material under normal curing. Through central pull-out test under the different conditions of protective layer thickness and embedded length, the load-slip curves, failure modes, and bond strength of 36 UHPC material specimens under normal curing were studied. The experimental results showed that the ultimate bond stress between UHPC material and steel strand under natural curing conditions is 7.01∼11.68 MPa. When the compressive strength of cube was 157 MPa; the bond strength under natural curing was smaller than that under thermal curing; when the thickness of the protective layer of steel strand with a diameter of 15.2 mm is greater than 30 mm, it had a little influence on bond strength. The regression analysis of the test results based on the experimental results proves that the recommended formulas for the design of transfer length and anchorage length of steel strand in UHPC material were in great agreement with the results of published studies.

Bond behavior of micro steel fibers embedded in ultra‐high performance concrete subjected to monotonic and cyclic loading

2019 ◽  
Vol 20 (4) ◽  
pp. 1243-1253 ◽  
Author(s):  
Jan‐Paul Lanwer ◽  
Vincent Oettel ◽  
Martin Empelmann ◽  
Svenja Höper ◽  
Ursula Kowalsky ◽  
...  
Keyword(s):  
Cyclic Loading ◽  
High Performance ◽  
High Performance Concrete ◽  
Steel Fibers ◽  
Ultra High Performance Concrete ◽  
Bond Behavior

Cost optimization of concrete bridge infrastructure

2003 ◽  
Vol 30 (5) ◽  
pp. 841-849 ◽  
Author(s):  
Mostafa A Hassanain ◽  
Robert E Loov
Keyword(s):  
Life Cycle ◽  
Life Cycle Cost ◽  
High Performance ◽  
High Performance Concrete ◽  
Cost Optimization ◽  
Concrete Bridges ◽  
Concrete Bridge ◽  
Analysis And Design ◽  
Prestressed Girders ◽  
Advanced Analysis

Recent surveys have indicated that between 30% and 40% of all bridges in North America are in various states of deterioration. Funding is limited owing to the existence of other deficient components of the transportation infrastructure. It is clear, therefore, that the return on the available funding needs to be maximized. This paper presents a review of publications on cost optimization of concrete bridge components and systems and then continues with a review of the state-of-the-art in life-cycle cost (LCC) analysis and design of concrete bridges. The main objective of the paper is to encourage bridge engineers to move towards the increased use of advanced analysis and design optimization methods.Key words: bridge, concrete, cost, high-performance concrete, infrastructure, life-cycle cost, optimization, prestressed girders, reliability.

Study on the Effect of Bond-Anchoring Factor on Bond Behavior between Deformed Bar and Shale Ceramic Concrete

2011 ◽  
Vol 403-408 ◽  
pp. 444-448
Author(s):  
Wei Jun Yang ◽  
Jie Yu ◽  
Yan Wang
Keyword(s):  
Experimental Data ◽  
Reinforced Concrete ◽  
Comparative Analysis ◽  
Anchorage Length ◽  
Bond Behavior ◽  
Pull Out ◽  
Practical Project ◽  
Deformed Bar

In this paper, the effect of bond-anchoring factor on bond behavior between deformed bar and shale ceramic concrete was analyzed by four groups of pull-out tests with different anchorage length. And three reinforced concrete pull-out tests used for comparative analysis were prepared at the same time. We obtained a series of experimental data and based on these data .A more accurate formula was summed up. This formula has a high value in guiding the practical project to choose the anchorage length.

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