Optimization of Temperature‐Control Measures for Concrete Structures: A Case Study of the Sluice Project

Huang, Yaoying

doi:10.1155/2018/4823130

Cited by 6 publications

(8 citation statements)

References 14 publications

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“…It can be seen from the concrete heat conduction equation 4that the temperature change of a specified concrete is related to time and internal heat production, that is to say, for equation 4FORMATION OF TEMPERATURE CRACKS OF CONCRETE IN HIGH-RISE BUILDINGS... which is used for describing the temperature variation of a specified concrete, it has two unknowns numbers, t and in Q . There are innumerable solutions satisfying equation 4from the mathematical point of view, but the special value solution is needed in practical application; hence it is necessary to add initial and boundary conditions [9] to equation (4).…”

Section: Principle Of Heat Conductionmentioning

confidence: 99%

“…Therefore, measures need to be taken to prevent it. Huang [4] regarded the prevention of pier concrete cracks as a multifactor system optimization problem and studied the optimization method of pier concrete temperature control measures using uniform design method and neural network model. He found that pier concrete should adopt inner tube cooling and adopt reasonable surface insulation measures and low concrete pouring temperature.…”

Section: Introductionmentioning

confidence: 99%

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Formation of Temperature Cracks of Concrete in High-Rise Buildings and the Corresponding Measures

2019

Archives of Civil Engineering

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A lot of heat will generate in mass concrete after pouring to form temperature cracks, which will reduce structural stiffness. This paper briefly introduces the principle of solid heat conduction and the cause of temperature crack formation and then used COMSOL software to simulate and analyze the mass concrete. The results showed that the simulation model had enough reliability to analyze the temperature change; the internal and external temperature of concrete rose first and then decreased; the formation of temperature crack was related to the internal and external temperature difference; the internal and external temperature difference was inversely proportional to the heat conductivity coefficient of concrete and directly proportional to the pouring temperature. Then, according to the analysis results, two measures were put forward to prevent temperature cracks in mass concrete: selecting concrete materials with high thermal conductivity, i.e., selecting coarse aggregate and fine aggregate with larger heat conductivity coefficient and reducing concrete pouring temperature, i.e., selecting cement with lower hydration heat, paying attention to temperature reduction in the process of concrete stirring, and reducing the amount of cement.

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Section: Principle Of Heat Conductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Formation of Temperature Cracks of Concrete in High-Rise Buildings and the Corresponding Measures

2019

Archives of Civil Engineering

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“…Such models usually include temperature component, hydraulic component, and aging component. Experiments demonstrate that temperature is crucial to control concrete deformation [2,3] and that variations in temperature are an important factor in determining the opening and closing of concrete cracks [4]. e temperature component is thus considerably sensitive to the temperature variations [1].…”

Section: Introductionmentioning

confidence: 99%

Improved Hybrid Model for Predicting Concrete Crack Openings Based on Chaos Theory

Huang

et al. 2022

Mathematical Problems in Engineering

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Conventional statistical models provide inaccurate predictions of concrete crack openings because they do not consider the nonlinear temperature response and the residual characteristics of concrete. To address this problem, this study introduces a nonlinear temperature factor and develops an improved statistical model of crack openings. The chaotic characteristics of residual time series of the improved statistical model are analyzed based on chaos theory and phase-space reconstruction theory. These theories are integrated with back-propagation (BP) artificial neural networks and genetic algorithms (GAs) to establish a GA-BP neural network model for predicting residuals. Finally, a hybrid model is developed for predicting the concrete crack opening behavior. The predictions of the conventional statistical model, the statistical model considering nonlinear temperature component, and the hybrid model are compared using the case study on the crack openings of a regulating sluice. The results show that the proposed hybrid model in this study for predicting concrete crack openings is significantly more accurate than the conventional statistical model and the statistical model considering nonlinear temperature component.

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“…For small water conservancy projects, it is difficult to use temperature control measures such as aggregate precooling and ice mixing to control the temperature of concrete pouring due to economic factors. For thin-walled and massive concrete structures such as hydraulic tunnel linings, aqueducts, and small sluice floors, due to the large temperature gradient inside the structure and the constraints of the foundation or surrounding rocks, large thermal stresses will be generated [10,11]. e thickness of the structure is thin, so it is not easy to lay cooling water pipes, and the cost of measures to limit the cracks in the steel bar is high [12].…”

Section: Introductionmentioning

confidence: 99%

Effect of Hydration Heat Inhibitor on Thermal Stress of Hydraulic Structures with Different Thicknesses

Shen

et al. 2020

Advances in Civil Engineering

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Concrete hydration heat inhibitor can inhibit the early hydration reaction of concrete and reduce the initial heat release of concrete. However, there is no in-depth research on the effect of hydration heat inhibitor on hydraulic structures with different thicknesses and constraints. In this paper, numerical simulation is used to study the change of temperature and stress field after adding hydration heat inhibitor by establishing the finite element models of tunnel lining, sluice, and gravity dam. The results show that the effect of the hydration heat inhibitors on reducing the temperature peak is inversely proportional to the thickness of the structure. A formula is put forward to evaluate their relation in this paper. When the thickness of the structure is about 6 m, there is no peak cutting effect. For the stress field, hydration heat inhibitor can greatly reduce the thermal stress of the thin-walled structure and make the structure meet the temperature control requirements; for the medium wall thickness structure, it can reduce the internal tensile stress about 50% and the surface tensile stress about 20%, and other temperature control measures are still needed to ensure that the surface tensile stress of the structure meets the requirements; for hydraulic structures with large volume and thickness, the application effect of the inhibitor has limitations, which can reduce the internal tensile stress about 30%, but the tensile stress in the surface area will increase about 7% due to the increase of the internal and external temperature difference; therefore, other temperature control measures such as arranging cooling water pipe, strengthening surface insulation, and so on are needed to ensure that temperature cracks do not occur. This paper provides references and suggestions for the research and engineering application of hydration heat inhibitor.

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Optimization of Temperature‐Control Measures for Concrete Structures: A Case Study of the Sluice Project

Cited by 6 publications

References 14 publications

Formation of Temperature Cracks of Concrete in High-Rise Buildings and the Corresponding Measures

Formation of Temperature Cracks of Concrete in High-Rise Buildings and the Corresponding Measures

Improved Hybrid Model for Predicting Concrete Crack Openings Based on Chaos Theory

Effect of Hydration Heat Inhibitor on Thermal Stress of Hydraulic Structures with Different Thicknesses

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