Temperature Control

Azenha, Miguel; Sfikas, Ioannis P.; Wyrzykowski, Mateusz; Kuperman, Selmo Chapira; Knoppik, Agnieszka

doi:10.1007/978-3-319-76617-1_6

Cited by 9 publications

(4 citation statements)

References 19 publications

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“…The heat of hydration, as a heat source term in the equation, is fitted by a commonly used power function heat release curve. This assumption is consistent with literature [12,27]. The innovation of this article is to introduce iterative control parameters into the substructure algorithm based on previous research.…”

Section: Verification Of Temperature Field Of Cooling Water Pipe Arra...supporting

confidence: 81%

Calculation of Mass Concrete Temperature Containing Cooling Water Pipe Based on Substructure and Iteration Algorithm

Zhang,

Su,

Song

et al. 2024

Computer Modeling in Engineering &Amp; Sciences

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Mathematical physics equations are often utilized to describe physical phenomena in various fields of science and engineering. One such equation is the Fourier equation, which is a commonly used and effective method for evaluating the effectiveness of temperature control measures for mass concrete. One important measure for temperature control in mass concrete is the use of cooling water pipes. However, the mismatch of grids between large-scale concrete models and small-scale cooling pipe models can result in a significant waste of calculation time when using the finite element method. Moreover, the temperature of the water in the cooling pipe needs to be iteratively calculated during the thermal transfer process. The substructure method can effectively solve this problem, and it has been validated by scholars. The Abaqus/Python secondary development technology provides engineers with enough flexibility to combine the substructure method with an iteration algorithm, which enables the creation of a parametric modeling calculation for cooling water pipes. This paper proposes such a method, which involves iterating the water pipe boundary and establishing the water pipe unit substructure to numerically simulate the concrete temperature field that contains a cooling water pipe. To verify the feasibility and accuracy of the proposed method, two classic numerical examples were analyzed. The results showed that this method has good applicability in cooling pipe calculations. When the value of the iteration parameter α is 0.4, the boundary temperature of the cooling water pipes can meet the accuracy requirements after 4∼5 iterations, effectively improving the computational efficiency. Overall, this approach provides a useful tool for engineers to analyze the temperature control measures accurately and efficiently for mass concrete, such as cooling water pipes, using Abaqus/Python secondary development.

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Section: Verification Of Temperature Field Of Cooling Water Pipe Arra...supporting

confidence: 81%

Calculation of Mass Concrete Temperature Containing Cooling Water Pipe Based on Substructure and Iteration Algorithm

Zhang,

Su,

Song

et al. 2024

Computer Modeling in Engineering &Amp; Sciences

View full text Add to dashboard Cite

show abstract

“…In practice, modifying the deformational and mechanical properties of the concrete with a given mix design is challenging. Therefore, the most convenient measure for lowering T z and T x is to decrease T 0 , which can be practically achieved by a wide range of temperature control measures [37]. For example, concrete mixing and casting are scheduled at night or in cool weather.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of zero-stress temperature and cracking temperature of high performance concrete at early ages

Dabarera

Dao

2022

Mater Struct

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Assessing the risk of cracking of high performance concrete induced by restrained volume changes from early ages is of considerable significance. To estimate and control such cracking risk of high performance concrete, two characteristic temperatures, namely zero-stress temperature (Tz) and cracking temperature (Tx) are crucial. In this study, the two temperatures are investigated in-depth by both theoretical analysis and experimental studies. For predicting the evolutions of Tz and Tx from early ages, rigorous yet practical models are proposed, which crucially take the visco-elastic behaviour of concrete into account. The reliability and predictive capability of the proposed models are demonstrated through a series of comparisons between the predicted and the measured results. Based on the predicted Tz and Tx profiles, practical thermal control criteria for preventing concrete from cracking caused by restrained strain are put forward. In principle, the actual temperature (T) of concrete should be kept higher than both Tz and Tx to properly maintain the stress induced by restrained strain in compression at early ages. If T becomes lower than Tz and reduces continuously, the lower the value of T, the higher the risk of cracking of concrete induced by restrained strain. As a consequence, once the value of T reaches or becomes lower than Tx, cracking is highly likely to occur. For a given actual temperature condition, lowering Tz and Tx can mitigate the risk of the cracking of concrete. Finally, effective measures for such lowering of Tz and Tx are also proposed.

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“…The pipe cooling method was implemented in 1931 for the construction of the Owyhee Dam in Oregon [3]. This technique has been used in many countries to control the temperature of large concrete masses, because it is suitable and less expensive for large concrete structures [4,5]. In recent years, with the vigorous promotion of information technology research in the construction industry, many scholars have combined pipeline cooling methods with modern information technology to study the intelligence and digitalization of concrete temperature control and crack prevention.…”

Section: Introductionmentioning

confidence: 99%

Development and Application of Intelligent Temperature Control System for Large Aqueduct

et al. 2022

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When the temperature rise and fall rates of a large-scale aqueduct with traditional water-cooling technology exceeds the standard, it is difficult to avoid the temperature change of aqueduct concrete deviating from its control curve in the process of temperature rise and fall by adjusting the water flow rate or cooling the water temperature of a water pipe only by manual experience. Aiming at such problems, an intelligent temperature control system for a large aqueduct body is developed and applied, which is composed of an information processing and decision-making module, simulation calculation module and information collection and control module, with real-time interactive information and real-time update of the temperature change control curve. The system is applied to the 1:30 Dongjia Village Aqueduct model experiment. The model experiment results show that the system can automatically adjust the water flow velocity of concrete according to the temperature variation control curve, and update the temperature variation control curve according to the changes of environmental parameters and cooling water parameters.

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Temperature Control

Cited by 9 publications

References 19 publications

Calculation of Mass Concrete Temperature Containing Cooling Water Pipe Based on Substructure and Iteration Algorithm

Calculation of Mass Concrete Temperature Containing Cooling Water Pipe Based on Substructure and Iteration Algorithm

Evaluation of zero-stress temperature and cracking temperature of high performance concrete at early ages

Development and Application of Intelligent Temperature Control System for Large Aqueduct

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