Assessment of curing schemes for effectively controlling thermal behavior of mass concrete foundation at early ages

Han, Sangyoung

doi:10.1016/j.conbuildmat.2019.117004

Cited by 20 publications

(8 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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

View full text Add to dashboard Cite

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

show abstract

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

View full text Add to dashboard Cite

show abstract

“…Ha et al [9] developed an automatic curing system that can effectively control the temperature difference between the core and surface and reduce the possibility of cracks. Han [10] considered the layered system (i.e., layered pouring) as a curing scheme, comparing it to an insulating system and pipe cooling. Notably, the layered system significantly reduces peak temperature and maximum temperature difference, offering substantial time and cost economies, particularly when horizontal construction joints are well-handled.…”

Section: Introductionmentioning

confidence: 99%

Heat of Hydration Analysis and Temperature Field Distribution Study for Super-Long Mass Concrete

Zhang,

Liu,

Liu

et al. 2024

Coatings

View full text Add to dashboard Cite

In this study, the combination of ordinary cement concrete (OCC) and shrinkage-compensating concrete (SCC) was utilized to pour super-long mass concrete. The temperature and strain of the concrete were continuously monitored and managed actively after pouring. The investigation focused on the temporal and spatial distribution patterns of the temperature field, the temperature difference between the core and surface, and the strain evolution. Based on the constructed hydration exothermic model of layered poured concrete, the effects of the SCC, molding temperature, and surface heat transfer coefficient on the temperature field were analyzed. The results show that the temperature of super-long mass concrete rises quickly but falls slowly. SCC exhibits higher total hydration heat than OCC. The temperature field is symmetric along the length but asymmetric along the thickness due to varying efficiency of heat dissipation between the upper and lower parts of the concrete. After final setting of the concrete, the strain varies opposite to the temperature and peaks at −278 με. A few short cracks are observed on the end of the upper surface. Moreover, the numerical simulation results are in good agreement with the measured results. Increasing the molding temperature and surface wind speed increases the temperature difference between the core and surface. Conversely, increasing the thickness of the insulation layer is an effective way to curtail this difference. Thermal stress analysis is carried out and shows that lowering the molding temperature of SCC and increasing the thickness of insulation material can effectively reduce thermal stress.

show abstract

“…The results showed that the cooling effect of steel pipe was the best, but the tensile stress was the largest. Han et al [ 19 ] analyzed the original model with a thermal insulation formwork and postcooling system by the layered pouring method based on the temperature stress field of the mass concrete foundation.…”

Section: Introductionmentioning

confidence: 99%

Hydration Heat Control of Mass Concrete by Pipe Cooling Method and On-Site Monitoring-Based Influence Analysis of Temperature for a Steel Box Arch Bridge Construction

Zhang¹,

Wang

Luo

et al. 2023

Materials

View full text Add to dashboard Cite

The steel box arch bridge in this study will be subjected to various temperature effects from the construction to the operation stage, including the cement hydration heat effect and the sunshine temperature effect caused by an ambient temperature change. Therefore, it is very important to control the temperature effect of steel box arch bridges. In this study, the newly built Dafeng River Bridge is selected as the steel box arch bridge. This study aims to investigate the temperature effect including hydration heat and the sunshine temperature effect of the construction process of a rigid frame-tied steel box arch bridge. The manuscript presents that the heat dissipation performance of concrete decreases with the increase in the thickness of a mass concrete structure. The average maximum temperature values of layer No. 3 are about 1.3, 1.2, and 1.1 times the average maximum temperature value of layer No. 1 for the mass concrete of the cushion cap, main pier and arch abutment, respectively. The higher the molding temperature is, the higher the maximum temperature by the hydration heat effect is. With each 5 °C increase in the molding temperature, the maximum temperature at the core area increases by about 4~5 °C for the mass concrete. The pipe cooling method is conducive to the hydration heat control effect of mass concrete. Based on the monitored temperature change and displacement change, the influences of daily temperature change on the steel lattice beam and arch rib are analyzed. A temperature rise will cause the structure to have a certain camber in the longitudinal direction, and the longitudinal or transverse displacement caused by the sunshine temperature change is no less than the vertical displacement. Due to the symmetrical construction on both sides of the river, the arch rib deformation on both sides presents symmetrical synchronous changes. Based on 84 h of continuous temperature monitoring on-site, the changing trends of the arch back temperature and ambient temperature are consistent and their difference is small during 1:00~4:00 in the morning, which is determined as the appropriate closure time for the newly built Dafeng River Bridge.

show abstract

Assessment of curing schemes for effectively controlling thermal behavior of mass concrete foundation at early ages

Cited by 20 publications

References 10 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

Heat of Hydration Analysis and Temperature Field Distribution Study for Super-Long Mass Concrete

Hydration Heat Control of Mass Concrete by Pipe Cooling Method and On-Site Monitoring-Based Influence Analysis of Temperature for a Steel Box Arch Bridge Construction

Contact Info

Product

Resources

About