Experiences and analysis of the construction process of mass foundation slabs aimed at reducing the risk of early age cracks

Smolana, Aneta; Klemczak, Barbara; Azenha, Miguel; Schlicke, Dirk

doi:10.1016/j.jobe.2021.102947

Cited by 16 publications

(8 citation statements)

References 33 publications

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“…Modeling guidelines considering geometric aspects have been outlined by the RILEM TC 287-CCS in [59]. Further analyses and recommendations regarding subsoil considerations can be found in [55,108,109].…”

Section: Coefficients In Thermal Analysismentioning

confidence: 99%

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Modeling of Heat and Mass Transfer in Cement-Based Materials during Cement Hydration—A Review

Klemczak,

Smolana,

Jędrzejewska

2024

Energies

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Cement-based materials encompass a broad spectrum of construction materials that utilize cement as the primary binding agent. Among these materials, concrete stands out as the most commonly employed. The cement, which is the principal constituent of these materials, undergoes a hydration reaction with water, playing a crucial role in the formation of the hardened composite. However, the exothermic nature of this reaction leads to significant temperature rise within the concrete elements, particularly during the early stages of hardening and in structures of substantial thickness. This temperature rise underscores the critical importance of predictive modeling in this domain. This paper presents a review of modeling approaches designed to predict temperature and accompanying moisture fields during concrete hardening, examining different levels of modeling accuracy and essential input parameters. While modern commercial finite element method (FEM) software programs are available for simulating thermal and moisture fields in concrete, they are accompanied by inherent limitations that engineers must know. The authors further evaluate effective commercial software tools tailored for predicting these effects, intending to provide construction engineers and stakeholders with guidance on managing temperature and moisture impacts in early-age concrete.

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Section: Coefficients In Thermal Analysismentioning

confidence: 99%

“…Furthermore, a discussion on the available DIANA software options can be found in [140]. Examples of applications of mass concrete slabs are provided in [55,108].…”

Section: Diana Feamentioning

confidence: 99%

Modeling of Heat and Mass Transfer in Cement-Based Materials during Cement Hydration—A Review

Klemczak,

Smolana,

Jędrzejewska

2024

Energies

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“… The geometry of the ¼ of the analysed structure: ( a ) dimensions, ( b ) the FE model [ 32 , 33 , 34 , 42 ]. …”

Section: Figurementioning

confidence: 99%

“… Validation of the FE model: ( a ) temperature development, ( b ) stress development [ 32 , 33 , 34 , 42 ]. …”

Section: Figurementioning

confidence: 99%

Thermo-Mechanical Analysis of Mass Concrete Foundation Slabs at Early Age—Essential Aspects and Experiences from the FE Modelling

et al. 2022

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In this paper, the focus is placed on essential aspects of finite element modelling of thermo-mechanical behaviour of massive foundation slabs at early ages. Basic decision-making issues are discussed in this work: the potential need to explicitly consider the casting process in the modelling, the necessary size of the underlying soil to be modelled and the size of the FE mesh, and the need of considering daily changes of the environmental temperature and the temperature distribution over the depth of the soil. Next, the contribution of shrinkage to early age stresses, the role of the reinforcement, and the type of mechanical model are investigated. Comparative analyses aiming to investigate the most important aspects of the FE model and some possible simplifications with negligible effect on the results are made on the example of a massive foundation slab. Finally, the results are summarized with recommendations for creating the FE models of massive slabs at early ages.

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“…When controlling temperature differentials within concrete, factors such as the arrangement of cooling systems, ambient temperature, and pouring temperature need to be considered for their effects on the internal temperature field of concrete [24]. Smolana and others [25,26] discussed some analytical and numerical methods for assessing early-age cracking risks, predicting temperature field, and implementing appropriate protective measures, which contribute to the normal use and durability of concrete structures. Zhang [27] and others demonstrated, through a combination of theoretical, empirical, and numerical simulations, that lowering ambient temperature, reducing the initial temperature of poured concrete, increasing cooling water temperature, or enhancing cooling water flow rate can effectively accelerate concrete cooling and reduce temperature differentials between the interior and exterior of concrete.…”

Section: Introductionmentioning

confidence: 99%

Relationship between Ambient Temperature and Reasonable Heat Dissipation Coefficient of Mass Concrete Pouring Blocks

Zhang,

Zhao

et al. 2024

Materials

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In engineering practice, similar surface insulation measures are typically applied to different parts of mass concrete surfaces. However, this can lead to cracking at the edges of the concrete surface or the wastage of insulation materials. In comparison to flat surfaces, the edges of mass concrete structures dissipate heat more rapidly, leading to more pronounced stress concentration phenomena. Therefore, reinforced insulation measures are necessary. To reduce energy consumption and enhance overall insulation effectiveness, it is essential to study the specific insulation requirements of both the flat surfaces and edges of concrete separately and implement targeted surface insulation measures. Taking the bridge abutment planned for pouring in Nanjing City as the research object, this study established a finite element model to explore the effects of different ambient temperatures and different surface heat dissipation coefficients on the early-age temperature and stress fields of different parts of the abutment’s surface. Based on simulation results, reasonable heat dissipation coefficients that meet the requirements for crack prevention on both the structure’s plane and edges under different ambient temperatures were obtained. The results indicate that under the same conditions, the reasonable heat dissipation coefficient at the edges was smaller than that on the flat surfaces, indicating the need for stronger insulation measures at the edges. Finally, mathematical models correlating ambient temperature with reasonable heat dissipation coefficients for the structure’s plane and edges at these temperatures were established, with high data correlation and determination coefficients (R2) of 0.95 and 0.92. The mathematical models were validated, and the results from finite element calculations were found to be consistent with those from the mathematical models, validating the accuracy of the mathematical models. The conclusions drawn can provide references for the insulation of similar engineering concrete planes and edges.

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Experiences and analysis of the construction process of mass foundation slabs aimed at reducing the risk of early age cracks

Cited by 16 publications

References 33 publications

Modeling of Heat and Mass Transfer in Cement-Based Materials during Cement Hydration—A Review

Modeling of Heat and Mass Transfer in Cement-Based Materials during Cement Hydration—A Review

Thermo-Mechanical Analysis of Mass Concrete Foundation Slabs at Early Age—Essential Aspects and Experiences from the FE Modelling

Relationship between Ambient Temperature and Reasonable Heat Dissipation Coefficient of Mass Concrete Pouring Blocks

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