Evaluation of heat of hydration, temperature evolution and thermal cracking risk in high-strength concrete at early ages

Do, Tu Anh; Hoang, Tuyet Thi; Bui-Tien, Thanh; Hoang, Hai Viet; Duc, Tuan; Nguyen, Phan Anh

doi:10.1016/j.csite.2020.100658

Cited by 37 publications

(10 citation statements)

References 13 publications

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“…From a mesoscopic viewpoint, the widely accepted model to describe cement hydration is the Arrhenius hydration model, which is based on chemical reaction kinetics and strictly compliant with the laws of thermodynamics. The model has been extensively validated through numerous experiments [3][4][5]. Numerous scholars have developed concrete calculation models incorporating hydration heat and validated them with measured data.…”

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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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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“…In thin sections and slender structures, the heat generated is rapidly dissipated through the adjacent surfaces. In larger structures with thick sections, the heat generated in the core is not dissipated quickly enough, and a temperature differential develops between the core and the surface zones (Do et al, 2020;Li et al, 2020). This temperature differential, caused by the heat of hydration, is the predominant factor contributing to the potential for early-age thermal cracking in concrete structures Graham, 2009, 2003).…”

Section: Hydration Temperaturementioning

confidence: 99%

Self-Healing of Tensile and Shrinkage Cracks in Engineered Cementitious Composite Liquid Containing Structures

Hooshmand Nejad

2023

Preprint

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<p>In this research, the self-healing of shrinkage and direct tension cracks in engineered cementitious composites (ECC) panels was investigated. The water leakage and self-healing of ECC elements subjected to direct tension cracking were studied under the coupled effect of sustained loading and pressurized water. The experimental program included normal concrete (NC) and ECC panels with different supplementary cementitious materials (SCM), comprising fly ash Class-F, fly ash Class-C and granulated blast furnace slag. A test setup was designed to simulate the leakage in liquid containing structures (LCS). Each panel was subjected to direct tensile loading to induce full depth cracks, and then the leakage test was carried out under sustained load and different water pressures. To consider the effect of ECC composition on the self-healing of panels exposed to loading and pressurized water, the leakage rate was continuously studied until complete sealing. Additionally, a detailed microstructural analysis was completed on full depth drilled cores, in which the samples were taken from three layers of the healed cracks in order to investigate the influence of pressurized water on the self-healing products. The results of this study highlight the advantages of using ECC in LCS and confirm a considerable effect of water pressure and SCM type on the self-healing capability of ECC. In the second phase of this research, the cracking behavior of ECC under shrinkage and temperature strains was investigated. A test setup was designed to restrain the panels against the deformation. The experimental program considered the cracking and self-healing behavior of ECC and NC panels representing a segment of LCS in the field. These panels were monitored for seven months under various environmental conditions. Following the casting, the drying shrinkage strains, hydration and ambient temperature variation, as well as cracking profiles were monitored. Also, the self-healing capability of ECC cracks was investigated under randomly natural climate exposure. The results showed that, ECC prepared with slag and fly ash-F developed higher shrinkage, causing earlier cracking generation than NC. However, in contrast to NC in which the crack widths continue to develop over time, ECCs have the potential to self-heal under harsh field conditions.</p>

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“…The expansion and shrinkage caused by the thermal changes can strongly influence the stress distribution of the mass concrete structures (Huang et al, 2018;Do et al, 2020). According to Zhu's research (Zhu, 2013), the exponential function is adopted to calculate the hydration heat.…”

Section: The Hydration Heat Analysismentioning

confidence: 99%

Mechanical Behavior of the Novel Gradient Concrete Tower of a Cable-Stayed Bridge

et al. 2021

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In this paper, the novel gradient concrete is innovatively applied to the bridge towers of Chizhou Yangtze River Bridge to solve the cracking and insufficient durability problems of concrete towers. Fiber-reinforced concrete is used in the outer functional area of the bridge tower, to significantly improve its crack resistance during construction and service. Moreover, the integrated design of anti-cracking and mechanical properties of tower materials is achieved. To study the performance of the novel functional gradient concrete (FGC) tower, the mechanical properties of the FGC tower material are tested, and the overall finite element stress is analyzed. Based on the material properties, the mechanical behavior of the cable-stayed bridge tower is studied. The temperature and stress of the FGC tower during the generation of the hydration heat are compared with that of the ordinary concrete tower. The crack resistance of the FGC tower is analyzed by the finite element method. The results show that the FGC tower has good mechanical properties and durability for the cable-stayed bridge towers.

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Evaluation of heat of hydration, temperature evolution and thermal cracking risk in high-strength concrete at early ages

Cited by 37 publications

References 13 publications

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

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

Self-Healing of Tensile and Shrinkage Cracks in Engineered Cementitious Composite Liquid Containing Structures

Mechanical Behavior of the Novel Gradient Concrete Tower of a Cable-Stayed Bridge

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