Drying shrinkage of concrete elements

Vinkler, Marek; Vítek, Jan L.

doi:10.1002/suco.201500208

Cited by 21 publications

(13 citation statements)

References 11 publications

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“…To verify the developed numerical model and software, the results obtained through the numerical analysis were compared with the experimental results from literature (Example 1) (Vinkler and Vitek, 2017a;Vinkler and Vitek, 2017b). In Example 2, reinforced concrete beams with different types of reinforcement were numerically analyzed.…”

Section: Examplesmentioning

confidence: 99%

“…The experimental research focused on the drying and shrinkage of concrete, which is used as experimental confirmation for the developed model, was conducted at the Faculty of Civil Engineering CTU in Prague (Vinkler and Vitek, 2017a;Vinkler and Vitek, 2017b).…”

Section: Examplementioning

confidence: 99%

“…Furthermore, the results obtained with the developed numerical model [with the shrinkage prediction model Fib Model Code 2010 (fib Model Code for Concrete Structures 2010, 2013)], were compared with the numerical results from Vinkler and Vitek (2017a) and Vinkler and Vitek (2017b) obtained with other models for the shrinkage strain prediction from literature: Model Code 2010, Eurocode 2, Model ACI 209-R92, Model B4 and Model B4s. Comparing the results (Figures 9-11), it can be concluded that the Fib Model Code 2010 "generally" gives better results for the shrinkage strain prediction than other models (Vinkler and Vitek, 2017a;Vinkler and Vitek, 2017b). We put the word "generally" in quotes because some of the other models are better for some periods of shrinkage, especially early periods, but it can be clearly recognized that, in finally, periods (approximately after 50 days) the Fib Model Code 2010 fits the experimental results the best.…”

Section: Ec 374mentioning

confidence: 99%

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Analysis of the concrete shrinkage effects on the real behavior of the spatial concrete and reinforced concrete structures using the thermal analogy

Džolan

Kozul

Harapin

et al. 2019

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Purpose This paper aims to present an approach for the numerical simulation of concrete shrinkage. First, some physical mechanisms of shrinkage are described and then the developed numerical model for the analysis of shrinkage of spatial three-dimensional structures using thermal analogy is presented. Results of the real behavior of structures because of concrete shrinkage using the developed numerical model are compared with the experimental and it is clearly shown that the developed numerical model is an efficient tool in predicting the time-dependent behavior of all concrete structures. Design/methodology/approach In this paper, Fib Model Code 2010 to predict shrinkage deformation of concrete is used, and it was incorporated in the three-dimensional numerical model using the thermal analogy. Mentioned three-dimensional numerical model uses the modified Rankine material law to describe concrete behavior in tension and modified Mohr-Coulomb material law to describe concrete behavior in compression. The developed three-dimensional numerical model successfully analyzes the behavior of reinforced and/or prestressed concrete structures including time-dependent deformations of concrete as well. Findings Results are shown in this paper clearly demonstrate the reliability of the developed numerical model in predicting the shrinkage strain, as well as its impact on concrete and reinforced concrete structures. The results obtained using the developed numerical model are in better agreement with the experimental results, than the results obtained using the numerical models from literature that also use the Fib Model Code 2010 to predict the shrinkage strain. So, it can be concluded that for a real simulation of concrete structures, alongside the model for predicting the shrinkage strain, the models for concrete behavior in tension and compression have a very important role. Originality/value Results of the developed three-dimensional numerical model were compared with experimental results from literature and with theoretical foundations, and it can be talked that this numerical model presents a good tool for analysis of reinforced and prestressed concrete structures including shrinkage deformation of concrete. Results obtained using the developed three-dimensional numerical model are better agreed with experimental than results of other numerical model from literature.

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Section: Examplesmentioning

confidence: 99%

Section: Examplementioning

confidence: 99%

Section: Ec 374mentioning

confidence: 99%

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Analysis of the concrete shrinkage effects on the real behavior of the spatial concrete and reinforced concrete structures using the thermal analogy

Džolan

Kozul

Harapin

et al. 2019

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“…The temperature has a significant effect on the course and intensity of hydration, more precisely on shrinkage, but also on hardened concrete it also has a significant influence on the mass expansion. (Aïtcin, 1998(Aïtcin, , 2008Aïtcin & Mindess, 2011;Collepardi, 2010;Tazawa, 1999;Vinkler & Vitek, 2017).…”

Section: Introductionmentioning

confidence: 99%

Volume changes of concrete in interaction with sliding joint

Kropáček

Čajka

Mynarcik

2019

Modern Building Materials, Structures and Techniques (MBMST)

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The paper describes volume changes of cement plain concrete and steel fiber reinforced concrete with strength class C 30/37 in interaction with sliding joints. In the research experiment was performed large-dimensional specimens, on which volume changes were measured using string strain gauges. Below the large-dimensional specimens were designed sliding joints. The specimens were placed in a controlled laboratory environment and in an outdoor environment to simulate real conditions during construction and the measurements were carried out for several months. Volume changes of the concrete were compared to each other and significant influence of the sliding joints was observed. Significant influence on the development of volume changes also has dispersed reinforcement. Another part of the article is a comparison of experimental results with calculation models that allow to calculate the final shrinkage of concrete. Comparison results of volume changes with calculation models is important for demonstrating the effect of sliding joint, as currently valid calculation models do not consider the influence of subsoil and sliding joints, and the results are different as expected. For comparison model B4 (Bazant, 2015), model from technical standard EN 1992-1-1 (CSN EN 1992-1-1, 2006), model from fib model code 2010 (FIB, 2010) and model ACI (ACI, 2008) are used. The paper describes a unique experiment dealing with the influence of sliding joint on the development of volume changes of concrete from beginning of setting and hardening of concrete under precisely defined conditions, that allow comparison with calculation models and thus points to the shortcomings of the building practice.

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“…In addition, the creep and shrinkage of PC box girder bridges exhibit obvious 3D characteristics. For shrinkage, the effective cross‐section thicknesses of different elements are inconsistent . Moreover, when the balanced cantilever casting method is used, the concrete ages of the successive segments are different.…”

Section: Introductionmentioning

confidence: 99%

Three‐dimensional nonlinear creep and shrinkage effects of a long‐span prestressed concrete box girder bridge

Yang

et al. 2018

Structural Concrete

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To analyze the impacts of creep and shrinkage effects on the behaviors of long‐span prestressed concrete box girder bridges, a new nonlinear analysis model of creep and shrinkage effects that comprehensively considered three‐dimensional (3D) characteristics and girder damage evolution was presented. A corresponding numerical analysis method was implemented into the ABAQUS user‐supplied subroutine; this method was verified by comparing the analytical results to the classical experimental results. Finally, a continuous rigid frame bridge with a main span of 220 m was taken as an engineering example, and the analysis results and in situ measured data of long‐term deflection were compared. The results show that the 3D characteristic and the nonlinear property of creep have significant impacts on the prediction of long‐term deflection.

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Drying shrinkage of concrete elements

Cited by 21 publications

References 11 publications

Analysis of the concrete shrinkage effects on the real behavior of the spatial concrete and reinforced concrete structures using the thermal analogy

Analysis of the concrete shrinkage effects on the real behavior of the spatial concrete and reinforced concrete structures using the thermal analogy

Volume changes of concrete in interaction with sliding joint

Three‐dimensional nonlinear creep and shrinkage effects of a long‐span prestressed concrete box girder bridge

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