scholarly journals XFEM for Thermal Crack of Massive Concrete

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Guowei Liu ◽  
Yu Hu ◽  
Qingbin Li ◽  
Zheng Zuo
Keyword(s):  
Cooling System ◽  
Concrete Structures ◽  
Thermal Cracking ◽  
Pipe System ◽  
Degree Of Hydration ◽  
Thermal Cracks ◽  
Massive Concrete ◽  
Cooling Pipe ◽  
Equivalent Equation ◽  
Viscoelastic Constitutive Model

Thermal cracking of massive concrete structures occurs as a result of stresses caused by hydration in real environment conditions. The extended finite element method that combines thermal fields and creep is used in this study to analyze the thermal cracking of massive concrete structures. The temperature field is accurately simulated through an equivalent equation of heat conduction that considers the effect of a cooling pipe system. The time-dependent creep behavior of massive concrete is determined by the viscoelastic constitutive model with Prony series. Based on the degree of hydration, we consider the main properties related to cracking evolving with time. Numerical simulations of a real massive concrete structure are conducted. Results show that the developed method is efficient for numerical calculations of thermal cracks on massive concrete. Further analyses indicate that a cooling system and appropriate heat preservation measures can efficiently prevent the occurrence of thermal cracks.

Prevention of crack formation in massive concrete at an early age by cooling pipe system

2019 ◽  
Vol 20 (8) ◽  
pp. 1101-1107 ◽  
Author(s):  
Trong-Chuc Nguyen ◽  
Trong-Phuoc Huynh ◽  
Van-Lam Tang
Keyword(s):  
Crack Formation ◽  
Early Age ◽  
Pipe System ◽  
Massive Concrete ◽  
Cooling Pipe

Thermal Cracking Resistance in Massive Concrete Structures in the Winter Building Period

2015 ◽  
Vol 725-726 ◽  
pp. 431-441 ◽  
Author(s):  
Kirill Semenov ◽  
Yuri Barabanshchikov
Keyword(s):  
Concrete Structures ◽  
Thermal Cracking ◽  
Electric Heating ◽  
Winter Period ◽  
Temperature Influence ◽  
Technological Parameters ◽  
Cracking Resistance ◽  
Massive Concrete ◽  
Calculation Results ◽  
Concrete Hardening

The article deals with issues of the thermal cracking resistance in massive concrete and reinforced concrete structures during the building period. The paper lists the calculation results of the NPP reactor foundation mat thermal stressed state and thermal cracking resistance. The research also considers the concrete hardening temperature influence on its thermo-physical and deformation characteristics. The deformation criterion is used to calculate the concrete thermal cracking resistance. In addition, the paper focuses on the assignment of safe concrete pouring technological parameters in the winter period. Furthermore, the article estimates the necessity of the structure peripheral electric heating during the building period.

scholarly journals Building a nomogram to predict maximum temperature in mass concrete at an early age

2021 ◽  
Vol 263 ◽  
pp. 01008
Author(s):  
Trong - Chuc Nguyen ◽  
Van - Quang Nguyen ◽  
Nikolay Aniskin ◽  
Ba - Thang Phung ◽  
Quoc - Long Hoang
Keyword(s):  
Initial Temperature ◽  
Concrete Structures ◽  
Temperature History ◽  
Maximum Temperature ◽  
Early Age ◽  
Mass Concrete ◽  
The Finite Element Method ◽  
Thermal Cracks ◽  
Massive Concrete ◽  
Main Factor

During the construction of massive concrete structures, the main factor that affects the structure is temperature. The resulting temperature is the result of hydration of the cement and some other factors, which leads to the formation of thermal cracks at an early age. So, the prediction of temperature history in massive concrete structures has been a very important problem. In this study, with the help of numerical methods, a temperature nomogram was built to quickly determine the maximum temperature in concrete structures with different parameters such as size, cement content, and the initial temperature of the concrete mixture. The obtained temperature nomogram has been compared with the results of the finite element method and the model experiment gives reliable results. It can be used to predict maximum temperature in mass concrete structures to prevent the formation of thermal cracks.

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.

scholarly journals Control of Thermal Cracking by Pipe-Cooling System in Concrete Structures.

2000 ◽  
pp. 147-163
Author(s):  
Toshiaki MIZOBUCH ◽  
Yasuyuki FUTATSUKA ◽  
Yoshinori MURAO
Keyword(s):  
Cooling System ◽  
Concrete Structures ◽  
Thermal Cracking
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