Early-age residual stress and stress relaxation of high-performance concrete containing fly ash

Shen, Dejian; Liu, Kaiqi; Ji, Yong; Shi, Huafeng; Zhang, Jinyang

doi:10.1680/jmacr.16.00216

Cited by 24 publications

(6 citation statements)

References 47 publications

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“…Considering the form of the error function, the error function does not exhibit an original function and cannot be solved by the classical Newton-Leibniz formula, but only an approximate calculation can be performed. Currently, commonly utilized computational methods include the complex trapezoidal product method [10,48] and the hyperbolic tangent function approximation method [49]. Herein, the results obtained from the hyperbolic tangent function approximation calculation method are utilized to approximate the error function; subsequently, Equation ( 28) can be expressed as follows:…”

Section: Theoretical Modelingmentioning

confidence: 99%

Moisture Diffusion Coefficient of Concrete under Different Conditions

Zhou,

Li,

et al. 2023

Buildings

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Humidity change in concrete is the leading cause of concrete shrinkage. Moreover, the moisture diffusion coefficient of concrete is an essential parameter for assessing and predicting the internal moisture content of concrete. However, there is a lack of theoretical construction and experimental studies on the effect of different conditions, especially different constraints, on the moisture diffusion coefficient of concrete. Therefore, the internal humidity, pore structure parameters, and basic mechanical properties of concrete under different strength grades C30, C40, C50, and C60 (C stands for concrete and numbers indicate the strength class of the concrete), curing environments (dry and sealed curing conditions), and constraints were tested in this study. In addition, a calculation model of concrete’s internal humidity and humidity diffusion coefficient was established. The research findings show that the internal humidity of concrete decreased with age due to hydration and drying. External humidity had a significant effect on the moisture change of concrete, and the lower the external humidity, the larger the humidity diffusion coefficient and the faster the internal humidity of concrete decreases. Reinforcement (confinement) changes the pore structure parameters of the concrete, which in turn affects the transport of moisture within the concrete. The higher the reinforcement rate, the larger the pore structure parameters of the concrete, the larger the humidity diffusion coefficient, and the faster the concrete humidity decreases. The method proposed in the study can accurately predict the internal humidity of concrete using the humidity diffusion coefficient. The research results are a reference for preventing concrete shrinkage and cracking in construction.

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Section: Theoretical Modelingmentioning

confidence: 99%

Moisture Diffusion Coefficient of Concrete under Different Conditions

Zhou,

Li,

et al. 2023

Buildings

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“…Nevertheless, indirect impact, including the impact of temperature on the large-volume concrete as well as the creep and auto-shrinkage of concrete, has gradually played an important role in causing the cracking of concrete [ 1 ]. Research suggests that more than 80% of the concrete structural cracks have been resulted from the indirect impact, among which the impact of shrinkage is the most significant [ 2 , 3 ].…”

Section: Introductionmentioning

confidence: 99%

Concrete Elastic Modulus Experimental Research Based on Theory of Capillary Tension

Zhou

et al. 2022

Materials

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The risk of cracking in the early stage is a critical indicator of the performance of concrete structures. Concrete cracked when the tensile stresses caused by deformation under restraint conditions exceeded its tensile strength. This research aims at an accurate prediction of shrinkage cracking of concrete under constraints. Based on the theory of capillary tension under the concrete shrinkage mechanism, the method to test and compute the elastic modulus of a micro-matrix around the capillary, Et, was derived. Shrinkage and porosity determination tests were conducted to obtain the shrinkage values and confining stresses of concrete at different strength grades, different ages and under different restraint conditions, accordingly. Meanwhile, the proposed method of this research was used to obtain Et. The restraint stress given by Et was compared with the experimental result under the corresponding time. The results suggested a positive correlation between the elastic modulus of a micro-matrix around the capillary, Et, precomputed by the theory, and the static elastic modulus, Ec, and that the ratio between the two gradually decreased with the passage of time, which ranged from 2.8 to 3.1.

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“…High-strength concrete has higher strength and durability than conventional concrete due to its low water-to-cement ratio, denser internal structure, and low permeability [1]. However, autogenous shrinkage may take place when the water-to-cement ratio is below the critical level, resulting in cracking and reduction of the structure's serviceability [2][3][4][5]. Hence, internal curing has been employed to prevent autogenous shrinkage in high-strength concrete by replacing a percentage of normal-weight aggregates with lightweightweight aggregates [6,7], superabsorbent polymer (SAP), or other expansive materials [8,9].…”

Section: Introductionmentioning

confidence: 99%

Effect of Internal Curing with Superabsorbent Polymers on Bond Behavior of High‐Strength Concrete

Xiao

Wang

Jiang

et al. 2020

Advances in Materials Science and Engineering

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High-strength concrete (HSC) is widely used in engineering due to its high strength and durability. However, because of its low water-to-cement ratio, external curing water hardly enters the dense internal structure of HSC so that high self-desiccation shrinkage often takes place. As a result, superabsorbent polymers (SAP) are added as an internal curing material to effectively reduce the shrinkage of high-performance concrete. Meanwhile, the bond performance between reinforcing steel and SAP HSC concrete remains unknown. In this paper, the bond performance of HSC mixed with SAP is studied by pull-out tests, and the results were obtained as follows: (1) the bond strength of HSC mixed with SAP increased first and then decreased with the increase of SAP content; (2) the slip at ultimate bond strength of HSC with SAP decreased with the increase of compressive strength; (3) a prediction model of the stress-slip relationship between steel rebars and HSC was established.

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Early-age residual stress and stress relaxation of high-performance concrete containing fly ash

Cited by 24 publications

References 47 publications

Moisture Diffusion Coefficient of Concrete under Different Conditions

Moisture Diffusion Coefficient of Concrete under Different Conditions

Concrete Elastic Modulus Experimental Research Based on Theory of Capillary Tension

Effect of Internal Curing with Superabsorbent Polymers on Bond Behavior of High‐Strength Concrete

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