scholarly journals Pull-Out Strength and Bond Behavior of Prestressing Strands in Prestressed Self-Consolidating Concrete

Materials ◽  
2014 ◽  
Vol 7 (10) ◽  
pp. 6930-6946 ◽  
Author(s):  
Wu-Jian Long ◽  
Kamal Khayat ◽  
Guillaume Lemieux ◽  
Soo-Duck Hwang ◽  
Feng Xing
Keyword(s):  
Self Consolidating Concrete ◽  
Bond Behavior ◽  
Pull Out ◽  
Prestressing Strands ◽  
Pull Out Strength

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.

scholarly journals The effect of tissue culture on suture holding strength and degradation in canine tendon

2009 ◽  
Vol 34 (5) ◽  
pp. 643-650 ◽  
Author(s):  
H. OMAE ◽  
C. ZHAO ◽  
Y.-L. SUN ◽  
M. E. ZOBITZ ◽  
S. L. MORAN ◽  
...  
Keyword(s):  
Tissue Culture ◽  
Tensile Load ◽  
Flexor Digitorum Profundus ◽  
Tendon Suture ◽  
Pull Out ◽  
Culture Model ◽  
Static Tensile ◽  
Tissue Culture Model ◽  
Flexor Digitorum ◽  
Pull Out Strength

The purpose of this study was to assess tendon metabolism and suture pull-out strength after simple tendon suture in a tissue culture model. One hundred and twelve flexor digitorum profundus tendons from 28 dogs were cultured for 7, 14, or 21 days with or without a static tensile load. In both groups increased levels of matrix metalloproteinase (MMP) mRNA was noted. Suture pull-out strength did not decrease during tissue culture. While the presence of a static load had no effect on the pull-out strength, it did affect MMP mRNA expression. This tissue culture model could be useful in studying the effect of factors on the tendon-suture interface.

Size Effect on the Bond Behavior of Grouted Reinforcing Bars Embedded in Light-weight Concrete

2021 ◽  
Author(s):  
Aamer Abbas ◽  
◽  
Yaqoob Yaqoob ◽  
Ola Hussein ◽  
Ibrahim Al-Ani ◽  
...  
Keyword(s):  
Bond Strength ◽  
Concrete Specimen ◽  
Light Weight ◽  
Reinforcing Bars ◽  
Conventional Concrete ◽  
Bond Behavior ◽  
Pull Out ◽  
Specimen Width ◽  
Light Weight Concrete ◽  
The Relationship

This study presents experimentally the bond behavior of light-weight concrete specimens with grouted reinforcing bars in comparison with conventional concrete specimens. A total of (9) pull-out specimens were studied; (3) specimens of conventional concrete, (3) specimens of light-weight concrete, and other (3) specimens of grouted light-weight concrete. Two variables are adopted in this investigation: specimen width and type of concrete (conventional concrete, light-weight concrete and grouted light-weight concrete). The study contains a discussion of the general behavior of the specimens in addition to the study of the ultimate bond capacity, maximum bond stresses and the relationship between the stress and the slip for different pull-out specimens. Results show that bond strength is highest for the largest specimen size (bond strength of grouted light-weight concrete specimen with specimen width 400 mm is higher than that of the specimen with (200 mm) width by about (13.13%)). Also, bond strength is highest for the grouted light-weight concrete specimen (bond strength of grouted light-weight concrete specimen is higher than conventional concrete specimen by (11.11%)).

scholarly journals PULL-OUT STRENGTH OF STEEL RODS BONDED INTO MENGKULANG (TARRIETIA JAVANICA) GLULAM AT FIVE DIFFERENT ANGLES TO THE GRAIN

2018 ◽  
Vol 30 (1) ◽  
pp. 67-74
Author(s):  
Mohamad WNN ◽  
Suliman NH ◽  
Kamarudin MK ◽  
Mohd-Amin N ◽  
Hassan R
Keyword(s):  
Pull Out ◽  
Pull Out Strength

Effect of Reduced Bond of Prestressed Strands

2016 ◽  
Vol 249 ◽  
pp. 296-300
Author(s):  
Jan L. Vítek ◽  
David Čítek
Keyword(s):  
Protective Coatings ◽  
Experimental Program ◽  
Winter Period ◽  
Bending Tests ◽  
Pull Out ◽  
Prestressing Strands ◽  
Post Tensioned

Bond of prestressing strands may be reduced by using protective coatings against corrosion during winter period, when early grouting of ducts may be impossible. It was not verified if the reduced bond has an influence on the performance of the post-tensioned structures. The experimental program was prepared, which investigated the bond of prestressing strands without protection and with two types of protective coatings. The program had two parts, laboratory pull-out tests and bending tests of large post-tensioned beams. The paper presents the results of this experimental program.

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