Effect of Thermal Parameters on Hydration Heat Temperature and Thermal Stress of Mass Concrete

Zhao, Yuqin; Li, Gaosheng; Fan, Cheng; Pang, Wentai; Wang, Yongtao

doi:10.1155/2021/5541181

Cited by 11 publications

(6 citation statements)

References 31 publications

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“…In this field, the research team has carried out innovative researches in many aspects, such as rapid automatic dam modeling, substitution of the curtain of drainage holes by seeping layers for analysis on seepage field, model for simulating the real behaviors of transverse joints, efficient parallel algorithm for solving equations, method to determinate real parameters and criteria of concrete, etc., and formed the whole-process simulation & analysis method of concrete dam and SAPTIS simulation calculation program, which laid a foundation for studying the real working behaviors of concrete dams. It can display the spatiotemporal state and distribution of temperature and stress in various forms [16]. As shown in figure 2 for a typical expression of results.…”

Section: Whole-process and Whole-dam Simulation And Analysis Methodsmentioning

confidence: 99%

Research on Key Technology of Temperature Control in the Whole Process of RCC Dam Construction

Jiang¹,

Zhang

Yan³

et al. 2022

Advances in Transdisciplinary Engineering

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In recent years, China’s hydropower station projects are mainly concentrated in the southwest region. These huge projects are facing the tight construction period and complex construction conditions, especially strong wind, dry and hot, single-point rainstorm, low early-stage strength and remarkable later-stage temperature rise of roller-compacted concrete (RCC) dam, it is very difficult to control temperature and prevent concrete dam from cracking. Based on the development status of intelligent temperature control for concrete dam, we innovatively carried out a study on the intelligent whole-process temperature control during the construction of RCC dam in combination with the actual situations of projects in the southwest region and the current research progresses; proposes the overall framework, roadmap and various research issues; puts forward a method to obtain the real crack-resistance properties through combining TSTM with simulation calculation; and realizes the coupling regulation with intelligent temperature control through creating feedback-simulation cloud platform; finally, the dynamic whole-process intelligent feedback control can be realized for concrete dam from raw materials to mixing, transportation, pouring, temperature monitoring, cooling water supply, protection and maintenance, so as to guarantee the construction quality of RCC dam under complex and serve conditions.

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Section: Whole-process and Whole-dam Simulation And Analysis Methodsmentioning

confidence: 99%

Research on Key Technology of Temperature Control in the Whole Process of RCC Dam Construction

Jiang¹,

Zhang

Yan³

et al. 2022

Advances in Transdisciplinary Engineering

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“…Finally, these predictions were compared with the real-time monitoring results of the bridge foundation. Zhao et al [20] conducted numerical tests on hydration heat parameters and found that increasing the thermal conductivity of concrete and reducing the specific heat and temperature rise coefficient could reduce the maximum temperature of concrete. However, other thermal parameters showed no significant effect on the maximum temperature.…”

Section: Cmes 2024mentioning

confidence: 99%

Calculation of Mass Concrete Temperature and Creep Stress under the Influence of Local Air Heat Transfer

Zhang,

Su,

Chen

et al. 2024

CMES

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Temperature-induced cracking during the construction of mass concrete is a significant concern. Numerical simulations of concrete temperature have primarily assumed that the concrete is placed in an open environment. The problem of heat transfer between the air and concrete has been simplified to the concrete's heat dissipation boundary. However, in the case of tubular concrete structures, where air inlet and outlet are relatively limited, the internal air temperature does not dissipate promptly to the external environment as it rises. To accurately simulate the temperature and creep stress in tubular concrete structures with enclosed air spaces during construction, we establish an air-concrete coupled heat transfer model according to the principles of conjugate heat transfer, and the accuracy of the model is verified through experiments. Furthermore, we conduct a case study to analyze the impact of airflow within the ship lock corridor on concrete temperature and creep stress. The results demonstrate that enhancing airflow within the corridor can significantly reduce the maximum concrete temperature. Compared with cases in which airflow within the corridor is neglected, the maximum concrete temperature and maximum tensile stress can be reduced by 12.5°C and 0.7 MPa, respectively, under a wind speed of 4 m/s. The results of the traditional calculation method are relatively close to those obtained at a wind speed of 1 m/s. However, the temperature reduction process in the traditional method is faster, and the method yields greater tensile stress values for the corridor location. KEYWORDSConjugate heat transfer; temperature field; mass concrete; creep stress 1 IntroductionCurrently, the global annual volume of poured concrete exceeds 200,000 tons [1]. Various factors contribute to the susceptibility of mass concrete to cracking during construction, which directly reduces the bearing capacity, durability, and waterproofing of structures. Generally, the factors influencing concrete crack formation can be categorized into two groups: internal and external. Regarding internal factors, temperature stress is the primary cause of crack formation. The temperature difference

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“…To mitigate this, researchers have explored various materials. These include the use of the pipe cooling method (Zhang et al 2023), low heat cement (Jadhav 2021), microcapsules sustain release (MSR) as a sustained-release type hydration heat inhibitor (Jia et al 2021), reducing the amount of cement, selecting coarse aggregates with larger particle sizes and high thermal expansion coefficients (Zhao et al 2021), and using ground granulated blast furnace slag (GGBS) (Yalçınkaya et al 2021) to reduce the heat of hydration.…”

Section: Introductionmentioning

confidence: 99%

“…The heat of hydration is influenced by the type of mix and the size of the concrete. Some researchers have studied autogenous shrinkage for mass concrete (Kim et al 2009), and dams (Zhao et al 2021;Kim 2010), but not many have studied it for full-scale beam. There is a close relationship between heat of hydration and autogenous shrinkage at an early age, especially between HHV (hydration heating rate) and ASV (autogenous shrinkage rate).…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of Hydration Heat to Autogenous Shrinkage in Full-Scale High-Performance Concrete Beams

2023

CER

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High-performance concrete is more susceptible to cracking at an early age. During hydration, various forces come into play, including heat generated by hydration, forces driving the growth of hydration products, and forces contributing to the reduction of pore number and size. Heat hydration is one of the things highlighted as the cause. The investigation of full-scale beam hydration heat aims to address the challenge of producing crackfree HPC. This research was carried out experimentally on full-scale prestressed beams measuring 2006003000 (mm) with a compressive strength (fc') of 60 MPa. Shrinkage and temperature in the concrete were measured using vibrating wire-embedded strain gauges. Four gauges were installed at 1030 mm from each end, and another four were placed in the middle of the beam. After casting, the beam were immediately covered with burlap sacks to keep them consistently moist. Strain and temperature observations were recorded every 15 minutes starting immediately after casting. Eight autogenous shrinkage phenomena were identified in full-scale beams. Phenomena 1 and 6 showed no sensitivity to hydration heat release. Phenomenon 1 occurred within the first 3 hours, during which the surrounding temperature still influenced the concrete temperature. Phenomenon 6 took place at 20.5-20.7 hours, indicating a sudden jump in autogenous shrinkage not accompanied by heat of hydration. The critical period, from age 9.5 to 16 hours, sees the highest values of temperature and shrinkage in the concrete. At this time the beams can be given special treatment. A growth sketch of the hydration product has been proposed.

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Effect of Thermal Parameters on Hydration Heat Temperature and Thermal Stress of Mass Concrete

Cited by 11 publications

References 31 publications

Research on Key Technology of Temperature Control in the Whole Process of RCC Dam Construction

Research on Key Technology of Temperature Control in the Whole Process of RCC Dam Construction

Calculation of Mass Concrete Temperature and Creep Stress under the Influence of Local Air Heat Transfer

Sensitivity of Hydration Heat to Autogenous Shrinkage in Full-Scale High-Performance Concrete Beams

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