Numerical Simulation of Bond Behavior for Adhesive Anchor in Steel-to-Concrete Connection Exposed to Fire

2013 ◽  
Vol 351-352 ◽  
pp. 860-864
Author(s):  
Qun Xie ◽  
Chong Ji Zhu ◽  
Hao Xue Ju
Keyword(s):  
Numerical Simulation ◽  
Tensile Strength ◽  
High Temperature ◽  
Elevated Temperature ◽  
Bond Strength ◽  
Fe Model ◽  
Bond Behavior ◽  
Anchor Length ◽  
Tensile Performance ◽  
Negative Effect

Adhesive anchor is an effective tool for a steel-to-concrete connection combined with the way of post-installed anchorage. However the bond strength of adhesive will decrease at elevated temperature which has a negative effect on anchorage behavior. In this paper a numerical analysis with 3D FE model has been carried out to investigate the tensile performance of adhesive anchor in a steel-to-concrete connection subjected to fire and the results show that high temperature have significant impact on bond strength of anchor even with the protection of fire resisting coating covering the surface of concrete base and the bond stress does not distribute along anchor length during the process of heating. The tensile strength of adhesive anchor presents a great reduction at elevated temperature compared with the strength in normal temperature.

Mechanisms, New Test Methodology and Environmentally Acceptable Inhibitors for Co-deposition of Zinc Sulfide and Calcium Carbonate Scales for High Temperature Application

2014 ◽  
Author(s):  
Christopher Tortolano ◽  
Tao Chen ◽  
Ping Chen ◽  
Harry Montgomerie ◽  
Thomas Hagen ◽  
...  
Keyword(s):  
High Temperature ◽  
Elevated Temperature ◽  
Zinc Sulfide ◽  
Test Methods ◽  
Mechanism Study ◽  
The North ◽  
Challenging Environment ◽  
Recent Developments ◽  
Negative Effect ◽  
The Difference

Abstract Zinc sulfide (ZnS) is one of the notoriously exotic scales formed in the high temperature oil fields. Its formation can potentially cause severe scale issues by itself or combined with conventional CaCO3 scale. Limited publications are available on ZnS deposition/inhibition, let alone the combined ZnS and CaCO3 scales. The mechanisms of these scale interactions are still unknown. The relatively small amount of ZnS precipitated that adheres to surfaces and its ‘soft’ scale characteristic make it difficult to test ZnS using traditional scale inhibitor evaluation test methods, especially at high temperature. A new methodology with modified dynamic loop test combining the traditional test coil and novel test filter system has been developed and allows evaluating ZnS and combined ZnS/CaCO3 at high temperature in the absence and in the presence of scale inhibitors. Co-deposition of ZnS/CaCO3 and the interference between ZnS and CaCO3 have been studied at elevated temperature. The mechanisms have been addressed by both scale prediction and laboratory tests. Findings from this study show that ZnS dramatically accelerated CaCO3 formation within the test brine and made the scaling condition extremely harsh, even with a very small amount of ZnS present. Several types of inhibitor chemistries were short listed for this study based on a previously published mechanism study to assess their ability to prevent ZnS and co-deposition of ZnS/CaCO3 at elevated temperature. Type-1 inhibitor is dispersion/nucleation, type-2 is nucleation/growth and type-3 has no inhibition function on ZnS. The test results conducted at 170°C agree well with the mechanism assumed by the previous mechanism study, and the inhibition mechanisms are reinforced. The minimum inhibitor concentration (MIC) of scale inhibitors has been evaluated for CaCO3 and co-deposition of ZnS/CaCO3 at 70°C and 170°C. The difference of MIC gives an indication of the negative effect that very small amounts of ZnS can have on the inhibition of co-deposition. The performance of environmentally acceptable inhibitors is also presented for this challenging environment. This paper presents a comprehensive study of the challenge of ZnS and co-deposition of ZnS/CaCO3 under conditions similar to that of many of the current HT/HP field developments in the North Sea and recent developments in the Gulf of Mexico.

Mechanical Properties of Mg-8Zn-4Al-xCa Extruded Magnesium Alloy Tube at Elevated Temperature

2007 ◽  
Vol 546-549 ◽  
pp. 305-310
Author(s):  
Bao Yi Yu ◽  
Yu Ying Li ◽  
Hong Wu Song ◽  
Xiao Guang Yuan ◽  
Zhen Liu
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Elevated Temperature ◽  
Magnesium Alloy ◽  
Ultimate Tensile Strength ◽  
Yield Strength ◽  
Tensile Properties ◽  
Room Temperature ◽  
Alloy Tube ◽  
Tensile Performance

Microstructures and tensile properties of Mg-8Zn-4Al-xCax=0.6wt.%, 1.0wt.%, 1.3wt.%, named as alloy 1#, 2# and 3# , respectively)extruded magnesium alloy tube were studied at room and elevated temperature. The results show that Ca can increase tensile strength of the alloy at 150 and 200°C significantly. At the temperature of 200°C, alloy 3# achieved optimal tensile properties, of which the ultimate tensile strength, the yield strength and the elongation were 165.8MPa, 108.7Mpa and 41.5% respectively. Compared with the properties of as cast ZAC8506 Magnesium alloy, it is shown that the tensile properties of alloy 3# are much higher than that of ZAC8506 at both room temperature and 150°C. Alloy 3# also gets better tensile performance than AZ91D extruded tube produced in the same way at the temperature of 200°C Mg2Al3 and Ca2Mg5Zn13 phases are found in the microstructure which should contribute to the higher performance of alloy 3# at elevated temperature

Effect of Elevated Temperature on Bond Strength of Concrete

2019 ◽  
Vol 972 ◽  
pp. 26-33
Author(s):  
Muhammad Harunur Rashid ◽  
Md. Maruf Molla ◽  
Imam Muhammad Taki
Keyword(s):  
Mechanical Properties ◽  
Elevated Temperature ◽  
Bond Strength ◽  
Elevated Temperatures ◽  
Reinforced Concrete Structure ◽  
Bond Behavior ◽  
Pull Out ◽  
Steel Bar ◽  
Residual Capacity ◽  
Water Curing

In the case of exposure of reinforced concrete structure to accidental fire, an assessment of its residual capacity is needed. Bond strength of concrete was observed under elevated temperatures (150°, 250°, 350° and 500°C) in this study. Cylindrical specimens were prepared for pull-out tests to find out the bond behavior and to observe the mechanical properties of concrete. All the specimens were 100 mm diameter and 200 mm height. The pull-out specimens contain a 10 mm steel bar at its center. The specimens were tested at 52 days age following a 28 days water curing. Samples were preheated for 3 hours at 100°C temperature and then put into the furnace for 1 hour at the target temperature. Samples were tested before preheating as controlled specimens. In case of mechanical properties and the bond strength of concrete, there were no remarkable changes due to elevated temperature up to 150°C. However, the mechanical properties and bond strength were decreased gradually after 150°C temperature. Maximum reduction of bond strength observed was 52.13% and 49.8% at 500°C for testing within 1 hour and after 24 hours of heating respectively when compared to the controlled specimens. Bond strength was found to reduce at a greater rate than compressive strength due to the elevated temperature.

Effects of Element Yttrium on the Microstructure and Mechanical Properties of as-Cast Zn-25Al-5Mg-2.5Si Alloy

2011 ◽  
Vol 311-313 ◽  
pp. 591-595
Author(s):  
Ai Li Wei ◽  
Kun Yu Zhang ◽  
Hong Xia Wang ◽  
Wei Liang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
High Temperature ◽  
Elevated Temperature ◽  
Rare Element ◽  
Microstructure And Properties ◽  
Microstructure And Mechanical Properties

In this work, the effects of rare element yttrium (Y) on the microstructure and mechanical properties of the as-cast Zn-25Al-5Mg-2.5Si alloy at room and elevated temperature (100°C and 180°C) have been investigated. The alloys were prepared by conventional melting and casting routs with different Y contents (0 wt.%,0.1 wt.%,0.4 wt.%,0.8 wt.%,1.2 wt.% and1.5 wt.%). The results showed that the addition of Y element led to the formation of Al3Y phase and Y2Zn17 phase in the microstructure and the mechanical properties of the alloys rose at first and then dropped with the Y content increasing. When Y content was 0.4 wt.%, the optimization of microstructure and properties especially the tensile strength at high temperature was obtained. The tensile strength of the alloy at 180°C could be increased by 26.4%.

scholarly journals Experimental Investigation of the Effects of Concrete Alkalinity on Tensile Properties of Preheated Structural GFRP Rebar

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Hwasung Roh ◽  
Cheolwoo Park ◽  
Do Young Moon
Keyword(s):  
Tensile Strength ◽  
Elastic Modulus ◽  
High Temperature ◽  
Tensile Failure ◽  
Combined Effects ◽  
Test Results ◽  
Maximum Difference ◽  
Reinforcing Bars ◽  
Tensile Performance ◽  
Gfrp Bar

The combined effects of preexposure to high temperature and alkalinity on the tensile performance of structural GFRP reinforcing bars are experimentally investigated. A total of 105 GFRP bar specimens are preexposed to high temperature between 120°C and 200°C and then immersed into pH of 12.6 alkaline solution for 100, 300, and 660 days. From the test results, the elastic modulus obtained at 300 immersion days is almost the same as those of 660 immersion days. For all alkali immersion days considered in the test, the preheated specimens provide slightly lower elastic modulus than the unpreheated specimens, showing only 8% maximum difference. The tensile strength decreases for all testing cases as the increase of the alkaline immersing time, regardless of the prehearing levels. The tensile strength of the preheated specimens is about 90% of the unpreheated specimen for 300 alkali immersion days. However, after 300 alkali immersion days the tensile strengths are almost identical to each other. Such results indicate that the tensile strength and elastic modulus of the structural GFRP reinforcing bars are closely related to alkali immersion days, not much related to the preheating levels. The specimens show a typical tensile failure around the preheated location.

Microstructural characterization of a rapidly solidified Al-Fe-V-Si alloy for elevated temperature applications

1988 ◽  
Vol 46 ◽  
pp. 550-551
Author(s):  
R. E. Franck ◽  
J. A. Hawk ◽  
G. J. Shiflet
Keyword(s):  
High Temperature ◽  
Elevated Temperature ◽  
Grain Growth ◽  
Volume Fraction ◽  
Microstructural Characterization ◽  
Second Phase ◽  
Microstructural Stability ◽  
Elevated Temperature Strength ◽  
Temperature Applications

Rapid solidification processing (RSP) is one method of producing high strength aluminum alloys for elevated temperature applications. Allied-Signal, Inc. has produced an Al-12.4 Fe-1.2 V-2.3 Si (composition in wt pct) alloy which possesses good microstructural stability up to 425°C. This alloy contains a high volume fraction (37 v/o) of fine nearly spherical, α-Al12(Fe, V)3Si dispersoids. The improved elevated temperature strength and stability of this alloy is due to the slower dispersoid coarsening rate of the silicide particles. Additionally, the high v/o of second phase particles should inhibit recrystallization and grain growth, and thus reduce any loss in strength due to long term, high temperature annealing.The focus of this research is to investigate microstructural changes induced by long term, high temperature static annealing heat-treatments. Annealing treatments for up to 1000 hours were carried out on this alloy at 500°C, 550°C and 600°C. Particle coarsening and/or recrystallization and grain growth would be accelerated in these temperature regimes.

UDIMET 41

Alloy Digest ◽  
1964 ◽  
Vol 13 (6) ◽  
Keyword(s):  
High Temperature ◽  
Elevated Temperature ◽  
Physical Properties ◽  
Precipitation Hardening ◽  
Base Alloy ◽  
Heat Treating ◽  
Nickel Base Alloy ◽  
Temperature Performance ◽  
Nickel Base ◽  
Corrosion And Oxidation

Abstract UDIMET 41 is a vacuum induction melted precipitation hardening nickel-base alloy having outstanding room and elevated temperature properties. It possesses excellent corrosion and oxidation resistance. It is designed for highly stressed components operating in the 1400-1700 deg F temperature range. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as creep. It also includes information on low and high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: Ni-92. Producer or source: Special Metals Inc..

MO-RE 40MA

Alloy Digest ◽  
1998 ◽  
Vol 47 (12) ◽  
Keyword(s):  
High Temperature ◽  
Elevated Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Oxidation Resistance ◽  
Creep Strength ◽  
Heat Resistant Alloy ◽  
Resistant Alloy ◽  
Heat Resistant ◽  
Temperature Performance

Abstract MO-RE 40MA is a fully austenitic heat-resistant alloy for elevated temperature applications. The alloy is microalloyed for creep strength and oxidation resistance. This datasheet provides information on composition, physical properties, and tensile properties as well as creep. It also includes information on high temperature performance. Filing Code: Ni-548. Producer or source: Duraloy Technologies Inc.

UDDEHOLM QRO 80 MICRODIZED

Alloy Digest ◽  
1987 ◽  
Vol 36 (12) ◽  
Keyword(s):  
Fracture Toughness ◽  
High Temperature ◽  
Elevated Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Tool Steel ◽  
Die Casting ◽  
Heat Treating ◽  
Temperature Performance ◽  
Improved Performance

Abstract UHB QRO 80 MICRODIZED is a chromium-molybdenum-vanadium tool steel with improved performance for tooling used at elevated temperature as in forging, extrusion and die casting. It is electro-slag refined. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: TS-486. Producer or source: Uddeholm Aktiebolag.

VASCO 9-4-20

Alloy Digest ◽  
1997 ◽  
Vol 46 (10) ◽  
Keyword(s):  
Fracture Toughness ◽  
Tensile Strength ◽  
High Temperature ◽  
Ultimate Tensile Strength ◽  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
High Tensile Strength ◽  
Temperature Performance

Abstract Vasco 9-4-20 (0.20 wt% C) is a premium quality aircraft steel that combines high tensile strength with good fracture toughness. It is a heat-treatable alloy capable of developing an ultimate tensile strength greater than 190 ksi. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on high temperature performance as well as heat treating, machining, and joining. Filing Code: SA-489. Producer or source: Vasco, An Allegheny Teledyne Company.

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