A multiscale prediction model and simulation for autogenous shrinkage deformation of early-age cementitious materials

Zhao, Haitao; Liu, Jiaping; Yin, Xinlong; Wang, Yi; Huang, Donghui

doi:10.1016/j.conbuildmat.2019.04.225

Cited by 20 publications

(5 citation statements)

References 28 publications

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“…Since the model defaults to the zero time as the starting value, the calculated value of the model should be compared with the test results after demould to verify the applicability of the model. According to the self-consistent method, the shrinkage strain caused by the internal tensile stress

is shown in Equation (9) [ 61 , 62 ]:

where

is the saturation coefficient;

is the pore stress;

is the bulk modulus of elasticity, GPa;

is the bulk modulus of elasticity without pores, 44 GPa. The bulk modulus of elasticity is shown in Equation (10) [ 63 ]:

where E is the elastic modulus;

is the Poisson’s ratio, 0.2.…”

Section: Discussionmentioning

confidence: 99%

Section: Relationship Between Shrinkage and Relative Humidity Of Steamentioning

confidence: 99%

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Volume Deformation of Steam-Cured Concrete with Slag during and after Steam Curing

Han

et al. 2021

Materials

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In order to better predict the development of shrinkage deformation of steam-cured concrete mixed with slag, a deformation-temperature-humidity integrated model test, a hydration heat test, and an elastic modulus test were performed. The effects of the steam-curing process and the content of slag on shrinkage deformation, hydration degree and elastic modulus of concrete were studied. The results indicate that during the steam-curing process, the concrete has an “expansion-shrinkage” pattern. After the steam curing, the deformation of concrete is dominated by drying shrinkage. After the addition of slag, the shrinkage deformation of steam-cured concrete is increased. The autogenous shrinkage increases by 0.5–12%, and the total shrinkage increases by 1.5–8% at 60 days. At the same time, slag reduces the hydration degree of steam-cured concrete and modulus of elasticity. A prediction model for the hydration degree of steam-cured concrete is established, which can be used to calculate the degree of hydration at any curing age. Based on the capillary tension generated by the capillary pores in concrete, an integrated model of autogenous shrinkage and total shrinkage is established with the relative humidity directly related to the water loss in the concrete as the driving parameter. Whether the shrinkage deformation is caused by hydration reaction or the external environment, this model can better predict the shrinkage deformation of steam-cured concrete.

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is shown in Equation (9) [ 61 , 62 ]:

where

is the saturation coefficient;

is the pore stress;

is the bulk modulus of elasticity, GPa;

is the bulk modulus of elasticity without pores, 44 GPa. The bulk modulus of elasticity is shown in Equation (10) [ 63 ]:

where E is the elastic modulus;

is the Poisson’s ratio, 0.2.…”

Section: Discussionmentioning

confidence: 99%

Section: Relationship Between Shrinkage and Relative Humidity Of Steamentioning

confidence: 99%

Volume Deformation of Steam-Cured Concrete with Slag during and after Steam Curing

Han

et al. 2021

Materials

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show abstract

“…This model was further developed by Koenders (1997) and Ye (2003). Subsequent studies have confirmed that HYMOSTRUC has advantages in simulating cement hydration (Ye et al, 2003;Zhao et al, 2019).…”

Section: Cement Hydration and Hymostruc Modelmentioning

confidence: 98%

Numerical Simulation on Cement Hydration and Microstructure Development in Repair-Substrate Interface

Lan

Zhou

et al. 2022

Front. Mater.

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One of the key parameters for the performance of concrete repairs is the quality of the interface between the repair material and concrete substrate, which is determined by cement hydration and microstructure development. The moisture exchange between the repair material and concrete substrate plays an important role in the cement hydration and porosity of cementitious repair materials. To better understand the influence of moisture exchange on the hydration of cementitious repair materials, this paper presents a numerical simulation of cement hydration and microstructure development of repair materials, considering moisture exchange. The simulation results reveal that the moisture exchange between the repair material and concrete substrate results in a water content change in two parts. Before the repair material setting, the water absorption of an unsaturated concrete substrate causes a reduction in the w/c ratio in the repair material, decreasing the hydration rate of the repair material. After the repair material setting, the water migrates from the concrete substrate to the repair material to provide additional water to accelerate the hydration of unhydrated cement in the repair material.

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“…Compared with ordinary concrete, high-strength concrete has a lower water-binder ratio (typically ≤ 0.4) due to the addition of high-efficiency water-reducing agents [ 3 , 4 , 5 ]. When the water-binder ratio of concrete is less than 0.40 [ 6 ], autogenous shrinkage accounts for a greater proportion of the total shrinkage, which is an important factor causing concrete cracking [ 7 , 8 , 9 , 10 ]. The study of autogenous shrinkage in high-strength concrete needs more attention as it shortens the service life of concrete structures.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Water-Binder Ratio on the Autogenous Shrinkage of C50 Mass Concrete Mixed with MgO Expansion Agent

et al. 2023

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The high adiabatic temperature rise and low heat dissipation rate of mass concrete will promote rapid hydration of the cementitious material and rapid consumption of water from the concrete pores, which may significantly accelerate the development of concrete autogenous shrinkage. In this study, the effect of the water-binder ratio on the autogenous shrinkage of C50 concrete mixed with MgO expansion agent (MEA) was explained with respect to mechanical properties, pore structure, degree of hydration, and micromorphology of the concrete based on a variable temperature curing chamber. The results show that the high temperature rise within the mass concrete accelerates the development of early (14 d) autogenous shrinkage of the concrete, and that the smaller the water-binder ratio, the greater the autogenous shrinkage of the concrete. With the addition of 8 wt% MEA, the autogenous shrinkage of concrete can be effectively compensated. The larger the water-binder ratio, the higher the degree of MgO hydration, and in terms of the compensation effect of autogenous shrinkage, the best performance is achieved at a water-binder ratio of 0.36. This study provides a data reference for the determination of the water-binder ratio in similar projects with MEA.

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A multiscale prediction model and simulation for autogenous shrinkage deformation of early-age cementitious materials

Cited by 20 publications

References 28 publications

Volume Deformation of Steam-Cured Concrete with Slag during and after Steam Curing

Volume Deformation of Steam-Cured Concrete with Slag during and after Steam Curing

Numerical Simulation on Cement Hydration and Microstructure Development in Repair-Substrate Interface

Effect of the Water-Binder Ratio on the Autogenous Shrinkage of C50 Mass Concrete Mixed with MgO Expansion Agent

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