scholarly journals Stress Development and Crack Monitoring of Massive Concrete Walls with Embedded Air-cooling Pipes

2021 ◽  
Vol 19 (9) ◽  
pp. 999-1015
Author(s):  
Suduo Xue ◽  
Yan Geng ◽  
Xiongyan Li ◽  
Jinguang Li ◽  
Yanjie Song
Keyword(s):  
Air Cooling ◽  
Concrete Walls ◽  
Stress Development ◽  
Massive Concrete ◽  
Crack Monitoring ◽  
Cooling Pipes

scholarly journals Improving Heat Exchange Performance of Massive Concrete Using Annular Finned Cooling Pipes

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Lemu Zhou ◽  
Fangyuan Zhou ◽  
Hanbin Ge
Keyword(s):  
Concrete Block ◽  
Finite Element Models ◽  
Mass Concrete ◽  
Pipe System ◽  
Massive Concrete ◽  
Exchange Performance ◽  
Cooling Pipe ◽  
Cooling Pipes ◽  
Method Analysis ◽  
Peak Value

Cracks will be generated due to high internal temperature of the massive concrete. Postcooling method is widely employed as a standard cooling technique to decrease the temperature of the poured mass concrete. In this paper, an annular finned cooling pipe which can increase the heat transfer area between the flowing water and its surrounding concrete is proposed to enhance the cooling effect of the postcooling method. Analysis of the interior temperature variation and distribution of the concrete block cooled by the annular finned cooling pipe system and the traditional cooling pipe system was conducted through the finite element models. It is found that, for the concrete block using the proposed annular finned cooling pipe system, the peak value of the interior temperature can be further lowered. Compared with the traditional cooling pipe, the highest temperature of concrete with an annular finned cooling pipe appears earlier than that with the traditional cooling pipe.

The Design of Cooling Water Pipe and Cooling Analysis in Mass Concrete

2011 ◽  
Vol 255-260 ◽  
pp. 3510-3513
Author(s):  
Pan Wu Li ◽  
Qian Qian Si
Keyword(s):  
Heat Transfer Performance ◽  
Cooling Water ◽  
Mass Concrete ◽  
Water Cooling ◽  
Water Pipe ◽  
External Temperature ◽  
Concrete Cracking ◽  
Massive Concrete ◽  
Water Pipe Cooling ◽  
Cooling Pipes

Inconstruction process of mass concrete is apt to form excessive temperature stress and cause mass concrete cracking, because of its high inner temperature, big internal and external temperature difference. In order to prevent their cracking, in mass concrete of the internal Settings with cooling water pipe cooling is one of the commonly used massive concrete construction method. This paper presents a massive concrete design of cooling water cooling and calculation theory, based on the cooling pipes in concrete heat transfer performance, through the cooling water pipe and concrete heat exchange principle.

Cracking analysis of massive concrete walls with cracking control techniques

2012 ◽  
Vol 31 ◽  
pp. 12-21 ◽  
Author(s):  
Feng Lin ◽  
Xiaobin Song ◽  
Xianglin Gu ◽  
Bin Peng ◽  
Lianping Yang
Keyword(s):  
Concrete Walls ◽  
Control Techniques ◽  
Massive Concrete ◽  
Cracking Control

scholarly journals Study of the aerodynamic regime of the cooling system of the foundations of buildings on the filling soil in the conditions of the Far North

2018 ◽  
Vol 245 ◽  
pp. 10005 ◽  
Author(s):  
Victor Ivanov ◽  
Anastasiya Ivanova
Keyword(s):  
Cooling System ◽  
Engineering Calculation ◽  
Heat Fluxes ◽  
Frozen Soil ◽  
Air Cooling ◽  
Far North ◽  
Permafrost Soils ◽  
Air Cooling System ◽  
Air Channels ◽  
Cooling Pipes

During construction in the Far North, due to the preservation of permafrost soils, the buildings are arranged on piles and foundations on the bedding soil. In the foundations of buildings for a smaller impact on the ground and prevention from defrosting of the soil, air cooling systems with cooling pipes are provided. Seasonal and daily variations in the temperature of the outside air and intensity of solar radiation cause fluctuations in the temperature regime of the upper layers of the soil. As a result of transformation of natural soils into technogenic, its physical properties change significantly when exposed to negative temperatures. Freezing of the soil thawed out over the summer and its further cooling is achieved by passing cold air in the winter through the air channels. The cooling system must provide the position of the upper surface of the frozen soil state under the building, as adopted by the project. This paper discusses the aerodynamic mode of the air cooling system for foundations on bedding in permafrost soils during the construction of various buildings and structures while preserving the base soils in a frozen state and using natural cold of the outside air, which will improve the reliability of permafrost bases. An engineering method has been developed for calculating the heat fluxes of soil and pipeline laid in thickness. A technique for engineering calculation of change in the thermal regime depending on the parameters of the outside air is given, which will make it possible to usefully use the energy of the cold enclosed in the ground to warm the outside air.

Influence of Heat Treatments on Microstructures in an Fe-Co-V Alloy

1974 ◽  
Vol 32 ◽  
pp. 512-513
Author(s):  
S. Mahajan ◽  
M. R. Pinnel ◽  
J. E. Bennett
Keyword(s):  
Single Phase ◽  
Alloy Composition ◽  
Supersaturated Solid Solution ◽  
Cell Formation ◽  
Heat Treatments ◽  
Air Cooling ◽  
Iced Brine ◽  
Transmission Electron ◽  
The Matrix ◽  
Bcc Structure

The microstructural changes in an Fe-Co-V alloy (composition by wt.%: 2.97 V, 48.70 Co, 47.34 Fe and balance impurities, such as C, P and Ni) resulting from different heat treatments have been evaluated by optical metallography and transmission electron microscopy. Results indicate that, on air cooling or quenching into iced-brine from the high temperature single phase ϒ (fcc) field, vanadium can be retained in a supersaturated solid solution (α2) which has bcc structure. For the range of cooling rates employed, a portion of the material appears to undergo the γ-α2 transformation massively and the remainder martensitically. Figure 1 shows dislocation topology in a region that may have transformed martensitically. Dislocations are homogeneously distributed throughout the matrix, and there is no evidence for cell formation. The majority of the dislocations project along the projections of <111> vectors onto the (111) plane, implying that they are predominantly of screw character.

Crystallographic Differences of Metastable NI2MO in a NI-MO-AL Superalloy

1980 ◽  
Vol 38 ◽  
pp. 158-159
Author(s):  
Michael M. Kersker ◽  
E. A. Aigeltinger ◽  
J. J. IIren
Keyword(s):  
Mechanical Properties ◽  
Air Cooling ◽  
Solution Treated ◽  
Heat Treated ◽  
Metastable Compounds ◽  
Rapidly Solidified

Ni-rich alloys based on approximate ternary composition Ni-8Mo-15A1 (at%) are presently under investigation in an attempt to study the contribution, if any, of the profusion of Mo-rich NixMo metastable compounds that these alloys contain to their excellent mechanical properties. One of the alloys containing metastable NixMo precipitates is RSR 197 of composition Ni-8.96Mo-15.06A1-1.98Ta-.015Yt. The alloy was prepared at Pratt and Whitney Government Products Division, West Palm Beach, Florida, from rapidly solidified powder. The powder was canned under inert conditions and extruded as rod at 1315°C. The as-extruded rod, after air cooling, was solution treated at 1315°C for two hours, air cooled, and heat treated for one hour at 815°C, followed again by air cooling.

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