Heightening Design and Construction of the Reinforcement Concrete Chimney in Heated State

2011 ◽  
Vol 243-249 ◽  
pp. 5610-5613 ◽  
Author(s):  
Hong Bin Liu ◽  
Meng Li
Keyword(s):  
Reinforced Concrete ◽  
High Temperature ◽  
Normal Condition ◽  
Temperature State ◽  
Structural Measures ◽  
Reinforced Concrete Chimney ◽  
Heated State ◽  
Design And Construction

This paper introduced a project of reinforced concrete chimney with a height of 90 meters, which does not stop construction at nearly 200 degree Celsius, increased the height of the chimney with 10 meters. Reasonable structural measures were promoted to ensure the normal pouring of concrete chimneys. Compared with the normal condition, this measure is economical, low investment, feasible, etc. It provides far-reaching significance that increasing the height of the reinforced concrete chimney at the high temperature state.

Development of Laminar Plasma Shielded HF-ERW Process: Advanced Welding Process of HF-ERW 3

2012 ◽  
Author(s):  
Hideki Hamatani ◽  
Funinori Watanabe ◽  
Nobuo Mizuhashi ◽  
Sunao Takeuchi ◽  
Yoshiaki Hirota ◽  
...  
Keyword(s):  
High Temperature ◽  
Welding Process ◽  
Air Entrainment ◽  
Plasma Jets ◽  
Control Technique ◽  
Monitoring Methods ◽  
Line Pipe ◽  
Temperature State ◽  
Weld Area ◽  
Cold Gas

High frequency - electric resistance welded (HF-ERW) pipe has been successfully used for many years for a number of applications. The benefits of HF-ERW pipe are considerable, including a higher dimensional tolerance and lower prices than seamless pipe and UO pipe. The conventional weld seam produced by HF-ERW, however, often has a relatively low toughness. We have developed an automatic heat input control technique based on ERW phenomena that relies on optical and electrical monitoring methods and has been shown to result in a significant improvement in the toughness. Shielding of the weld area must also be considered as a key factor in the formation of a sound weld. It has been shown that an inert cold gas (e.g., at room temperature) shielding technique is effective for maintaining a stable low oxygen state in the weld area that inhibits the formation of penetrator, a pancake oxide inclusions. Compared to the cold gas shielding technique, high temperature gas shielding, due to its higher kinetic viscosity coefficient, should make it easier to sustain a higher laminar flow, thus leading to a rather low air entrainment in the shielding gas. In addition, plasma is a much higher temperature state (∼6000 K), and the dissociated gases can react with the entrained oxygen; plasma jets should, therefore, enhance the overall shielding effects. Moreover, oxides on the strip edges can be expected to melt and/or be reduced by the high temperature plasma jets. Nippon Steel has developed a plasma torch that can generate a long and wide laminar argon – nitrogen – (hydrogen) jet. This paper describes the results obtained from our investigation of the effects of a plasma jet shield on the weld area of high strength line pipe with a yield strength grade of X65. Preliminary attempts in applying this novel shielding technique has been found, as expected, to demonstrate extremely low numbers of weld defects and a good low temperature toughness of the HF-ERW seam.

Experimental Research on Bond Strength between Rebar and Concrete after High Temperature

2011 ◽  
Vol 71-78 ◽  
pp. 1057-1061 ◽  
Author(s):  
Ke Fang Yin ◽  
Yang Han ◽  
Yi Liu
Keyword(s):  
Reinforced Concrete ◽  
High Temperature ◽  
Bond Strength ◽  
Experimental Research ◽  
Bonding Strength ◽  
Different Temperatures ◽  
Ultimate Bond Strength

With the centrally pulling-out test, the bond strength of reinforced concrete is measured with different temperatures and different cooling ways after high temperature; and the ultimate bond strength and slip of reinforced and concrete under different conditions are analyzed. The results show that the bonding strength declines gradually with the increase of temperature, and the ultimate slippage also decreases gradually.

Temperature Field Analysis of Steel Reinforced Concrete Column in Fire

2013 ◽  
Vol 351-352 ◽  
pp. 615-618 ◽  
Author(s):  
Jian Hua Chen ◽  
Chao Ma ◽  
Jian Hua Li ◽  
Qin Qian
Keyword(s):  
Temperature Field ◽  
Reinforced Concrete ◽  
High Temperature ◽  
Field Analysis ◽  
Concrete Column ◽  
Distribution Law ◽  
Reinforced Concrete Column ◽  
Element Analysis ◽  
Steel Reinforced Concrete ◽  
Nice Agreement

In order to analyze the mechanical properties of the remaining carrying capacity of steel reinforced concrete columns after exposure to fire, full preparations must be needed. In this paper, the numerical simulation of the temperature field of steel reinforced concrete column section was being adopted the finite element analysis software MSC.MARC to analyze. Temperature distribution law of the column cross-section in the case of uneven fire was obtained. There has a nice agreement between calculation and original test data which created the conditions for high temperature and high temperature performance analysis for SRC columns

Future applications in Carbon reinforced concrete (CRC)

2018 ◽  
Author(s):  
Matthias Rolf Tietze ◽  
Frank Schladitz ◽  
Manfred Curbach ◽  
Alexander Kahnt ◽  
Robert Zobel
Keyword(s):  
Reinforced Concrete ◽  
High Temperature ◽  
Value Chain ◽  
Manufacturing Industry ◽  
Information Modeling ◽  
Sustainable Building ◽  
Economic Production ◽  
Building Information ◽  
Development Goals ◽  
Mineral Coatings

<p>The world of construction becomes smarter. New building processes, such as building information modeling (BIM), automated manufacturing (Industry 4.0) and sustainable building are an integral part of today’s industry. Also, new material combinations, like carbon reinforced concrete, capture more and more construction applications. The number of practical examples of carbon reinforced concrete has increased. However, this is only the beginning, as the development goals have not been reached yet. After the first approved systems, further questions arise, including high-temperature-resistant reinforcement, economic production processes and the vision of an integral planned, automatically produced, and sustainable smart building. In this vision, the embedded carbon reinforcement is part of the infrastructure that enables smart-home applications and pushes the research ahead. For example, pre-pregs of carbon reinforced concrete are being developed, based on well-known carbon fiber reinforced plastic (CFRP) applications. The curing process can be controlled and brought to an end at the construction side, days, or even weeks after the pre-fab production has taken place. Automated robots are capable of placing the carbon yarn in the pre-fabricated formwork. So, the typical manufacturing (value) chain is becoming outdated, as the usual rebar or grid manufacturing is omitted</p><p>– these are also part of the current developments. Also, mineral coatings for the high-temperature- resistant reinforcement are also under development, and it is showing promising results. Another niche industry revolves around multifunctional pre-cast components with integrated heating and energy storage and load-bearing functions, which are already cheaper than the classic separated components. We lead the C³ carbon concrete composite R &amp; D project and have an overview of the latest forward- looking and visionary development approaches in carbon reinforced concrete.</p>

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