Modelling of Coupled Shrinkage and Creep in Multiphase Formulations for Hardening Concrete

Gamnitzer, Peter; Brugger, Andreas; Drexel, Martin; Hofstetter, Günter

doi:10.3390/ma12111745

Cited by 9 publications

(3 citation statements)

References 37 publications

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“…This study has several limitations, such as collecting data on concrete compositions of water, cement, and aggregate contents, as well as the water-cement ratio obtained from primary data. These data referred to Gamnitzer et al (2019), where the experimental concrete compressive strength value was used to determine the bridge existing data. There are fin stiffeners on the box girder web, hence, the stiffeners cannot be modeled because the software uses frame elements.…”

Section: Methodsmentioning

confidence: 99%

Effect Of Creep On The Long-Term Deflection Of Box Girder Balanced Cantilever Bridge Structure Using B3 Model and CEB 2010

Purba

Supriyadi²,

Suhendro³

2022

jcef

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Creep significantly affects the long-term deflection of the prestressed concrete bridge structure. Some models often used in predicting creep do not consider the water-cement ratio. The water-cement ratio is a factor in the magnitude of creep. If the water-cement ratio is excessive, the creep will also be significant. B3 Model uses the water-cement ratio in predicting creep in prestressed concrete bridge structures and has provided good accuracy with measured deflection data. This study compares B3 Model with Model CEB 2010 to predict the effect of creep on the long-term deflection. The author modeled the bridge structure using Midas Civil 2022 v1.2 software by utilizing the construction stages analysis facility to idealize the balanced cantilever and the effect of creep on the long-term deflection. Envelope displacement of bridge B3 Model is more significant than CEB 2010. The prediction deflection of the B3 Model in 100 years of service life of the bridge is -16.34 cm, while CEB 2010 is -11.90 cm. Creep affects total deflection by 84% to 88%. Creep affects the deflection significant because, in the construction process, each box girder segment is stressed and loaded at the age of 3 days. At the age of 3 days, the elastic modulus of the concrete is still not entirely, and the cement paste on the concrete is still in the hydration process. The results showed a significant difference between B3 Model and CEB 2010. B3 Model predicts that the long-term deflection of the bridge until the end of the bridge's service life is 44% to 49% greater than the CEB 2010 model. Prediction of total deflection until the end of 100 years of bridge service life does not exceed the limit determined by SNI and CEB codes.

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Section: Methodsmentioning

confidence: 99%

Effect Of Creep On The Long-Term Deflection Of Box Girder Balanced Cantilever Bridge Structure Using B3 Model and CEB 2010

Purba

Supriyadi²,

Suhendro³

2022

jcef

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“…Considering the deformation of any material under load, rheology consists of three fundamental types of deformation: elastic, plastic, and viscous. These types can appear as elastic-plastic or visco-elastic [ 14 , 17 ]. The idealized deformations which are used to build up real behavior are elastic, viscous, or plastic and are represented by a spring, a dashpot, and a friction element, respectively [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Fly Ash on the Tensile Creep Prediction of High-Strength Concrete at Early Ages

Yao

Huang

et al. 2023

Materials

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In this study, the tensile creep (TC) of high-strength concrete (HSC) containing 30 wt% fly ash was measured at early ages to investigate the applicability of creep prediction models for concrete containing FA, and to provide ideas to study the prediction model of concrete creep containing other SCMs in the future. The TC values obtained from the experiment were compared with the predicted values of six TC models. Then the accuracy of different models was evaluated by the ratio of predicted values to experimental values. Finally, the applicability of these models to the TC of HSC with fly ash was discussed at an early age. By comparison, it was found that when the loading age was 1d, 2d, and 3d, the ZC model (ZC are the initials for the word “Self-developed” in Chinese), which is a rheology-based model for TC, proposed by Yang.Y et al. agreed with the experimental values. The predicted values of the other five models deviated significantly from the tested ones. When the loading age was 5d and 7d, the calculated results of the ACI 2009R model were more accurate. Compared with the other five models, the time dependency of the paste with fly ash was considered in the ZC model, and parameter q of the ZC model was introduced in order to characterize the influence of fly ash on the paste at early ages. Therefore, this paper demonstrated both theoretically and experimentally that the ZC model can better predict the early-age TC of HSC with fly ash.

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“…However, many factors affect shrinkage and creep that result in the change law of shrinkage and creep being complex, time-varying, and random [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ]. Many scholars have performed long-term theoretical and experimental research on concrete shrinkage and creep and proposed prediction models of concrete shrinkage and creep, considering different influencing factors [ 11 , 12 , 13 , 14 ]. To date, no theory has been developed that can completely and accurately explain or predict the shrinkage and creep characteristics of concrete.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Analysis and Experimental Verification of the Stress and Strain of Axially Compressed Steel-Reinforced Concrete Columns under Long-Term Loads

Han

Wang

et al. 2022

Materials

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The objective of this study is to provide a theoretical method to accurately calculate the stress and strain of steel-reinforced concrete (SRC) columns under long-term axial compression. First, considering the cross-sectional stress redistribution and the influence of each stress increment in the process, the theoretical formula of stress and strain under long-term loading was deduced. Then, the stress and strain calculation program of SRC columns under long-term axial compression was programmed by using object-oriented Visual C++ language. Finally, an experimental study on the long-term deformation performance of SRC axial compression columns was performed to validate the accuracy of the proposed theoretical method. By comparing the calculated results with the experimental results, the influence of steel bars on the long-term stress and strain of SRC columns under axial compression was analyzed and the corresponding long-term stress–strain variation law was studied. Results show that the changing trend of the long-term strain of plain concrete (PC) and SRC with loading time is basically the same, increasing rapidly in the first 270 days and gradually tending to be stable beyond 270 days. After 750 days, the maximum difference in the total strain between the PC columns and SRC columns reaches 26.60%, and the steel bars have a strong influence on the long-term strain of the concrete columns. The errors between the measured values of the two SRC columns, and the calculated results are 2.96% and 5.78%, respectively. Therefore, the derived stress–strain calculation formula and calculation program of SRC columns under long-term loads are accurate and reliable. When the loading time is 750 days, the tensile stress increment of 1.92 MPa and a compressive stress increment of 168.26 MPa are produced in concrete and steel bars. The long-term stress of concrete columns is markedly influenced by steel bars. In the first three years, the stress and strain of the concrete and steel bars develop rapidly and then gradually slow down.

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Modelling of Coupled Shrinkage and Creep in Multiphase Formulations for Hardening Concrete

Cited by 9 publications

References 37 publications

Effect Of Creep On The Long-Term Deflection Of Box Girder Balanced Cantilever Bridge Structure Using B3 Model and CEB 2010

Effect Of Creep On The Long-Term Deflection Of Box Girder Balanced Cantilever Bridge Structure Using B3 Model and CEB 2010

The Influence of Fly Ash on the Tensile Creep Prediction of High-Strength Concrete at Early Ages

Theoretical Analysis and Experimental Verification of the Stress and Strain of Axially Compressed Steel-Reinforced Concrete Columns under Long-Term Loads

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