Prediction of Elastic Modulus of Cement-Based Materials Based on Power’s Volume Model

Wu, Lei; Yan, Bing; Lei, Bin

doi:10.4028/www.scientific.net/amm.253-255.474

Cited by 3 publications

(3 citation statements)

References 6 publications

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“…Based on the X-CT-hydration–deterioration model, the compositions and volume fractions of microphases in cement-based material under sulfate attack were quantitatively predicted [ 42 ]. The elastic parameters of microphases in cement were obtained through a large number of nanoindentation experiments [ 29 , 43 , 44 , 45 , 46 , 47 ]. Then, through the SC method, the elastic parameters of cement paste were calculated with volume fractions and the elastic parameters of microphases [ 29 ].…”

Section: Evaluation Of the Elastic Modulus Of Corroded Mortar By Homo...mentioning

confidence: 99%

Experimental–Computational Investigation of the Elastic Modulus of Mortar under Sulfate Attack

Guan,

Zhang,

Gao

et al. 2023

Materials

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External sulfate attack is an important factor causing a decrease in the mechanical properties of cement-based materials. In this paper, a computational prediction model of elastic modulus, considering the characteristics of sulfate corrosion from outside to inside and the influence of the interface transition zone (ITZ), was established to predict the elastic modulus of mortar under the external sulfate attack. Firstly, the backscattered electron (BSE) images of mortar and the algorithm of image threshold segmenting were used to determine a reasonable thickness of corroded ITZ. Secondly, the nanoindentation test was adopted to acquire the microscopic elastic parameters of phases (sand, cement, and ITZ) in corroded mortar. Moreover, the mortar mix proportion and Lu and Torquato’s model were adopted to calculate the volume fractions of phases. Finally, a computational prediction model of elastic modulus of mortar under sulfate attack was proposed with homogenization methods. The results indicate that the thickness of corroded ITZ is 20 mm, and the error values of elastic modulus between the theoretical prediction results and the experimental results are within 8%, indicating that the macroscopic elastic modulus of corroded mortar can be precisely predicted by the computational prediction model of elastic modulus.

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Section: Evaluation Of the Elastic Modulus Of Corroded Mortar By Homo...mentioning

confidence: 99%

Experimental–Computational Investigation of the Elastic Modulus of Mortar under Sulfate Attack

Guan,

Zhang,

Gao

et al. 2023

Materials

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“…Due to the increase demand of using ECC in composite structures it becomes very important to study different methods of NDT that can be used for structural health monitoring [ 45 ]. MOE and MOR are the two impotant mechanical properities that affect the structural behaviour of not just CBMs [ 46 , 47 , 48 ], but also common structural materials like flakeboard [ 49 ] and woods [ 50 ]. Nevertheless, to the best knowledge of the authors, there is no research on the mNDI methods in monitoring ECC concrete, in particular, the MOE and MOR, and no exploration into their relationship.…”

Section: Introductionmentioning

confidence: 99%

Microwave Non-Destructive Inspection and Prediction of Modulus of Rupture and Modulus of Elasticity of Engineered Cementitious Composites (ECCs) Using Dual-Frequency Correlation

Chung

Zhang

et al. 2017

Sensors

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This research article presents dual-frequency correlation models for predicting the growth of elasticity and flexural strength of engineered cementitious composites (ECCs) using microwave nondestructive inspection technique. Parallel measurements of microwave properties and mechanical properties of ECC specimens were firstly undertaken in the sense of cross-disciplinary experiments. Regression models were developed via means of nonlinear regression to the measured data. The purpose of the study is: (i) to monitor the flexural strength and elasticity growth; and (ii) to predict their mature values under the influence of different initial water contents, via microwave effective conductance at early ages. It has been demonstrated that both the modulus of rupture (MOR) and modulus of elasticity (MOE) can be accurately modeled and correlated by microwave conductance using exponential functions. The moduli developed as a function of conductance whereas the regression coefficient exhibited a linear relation with water-to-binder ratio. These findings have highlighted the effectiveness of the microwave non-destructive technique in inspecting the variation of liquid phase morphology of ECCs. The dual-frequency correlation can be used for structural health monitoring, which is not only for prediction but also provides a means of verification.

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“…Macroscopic properties of cement-based materials mainly depends on the compositions and their structural characteristics at their micro-level, inquiring into the pore structure evolution of hardening cement paste from the micro perspective is one of the research focus at home and abroad in recent years [1]. The hardening cement paste is generally composed of unhydrated cement particles, C-S-H gel, portlandite and capillary holes, and its microstructure changed due to the chemical composition of cement, water-cement ratio and admixture.…”

Section: Introductionmentioning

confidence: 99%

Nanopore in C-S-H Gel Stability Analysis of Hardened Cement Pastes

Fang

2015

KEM

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Based on capillary tension, surface free energy and elasticity theory, a collapse model of nanopore in C-S-H gel was created in hardened cement pastes. The stability of pore was analyzed by Gibbs free energy theory. The results show that, the capillary is more stable while the capillary is grater and rounder in the case of the aperture changing in the nanometer scope. When the aperture is changing in the scope of micrometer, the collapse possibility of the capillary is tiny. If the capillary size is fixed, the capillary is more stable while the elastic modulus of hydrated products is higher.

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Prediction of Elastic Modulus of Cement-Based Materials Based on Power’s Volume Model

Cited by 3 publications

References 6 publications

Experimental–Computational Investigation of the Elastic Modulus of Mortar under Sulfate Attack

Experimental–Computational Investigation of the Elastic Modulus of Mortar under Sulfate Attack

Microwave Non-Destructive Inspection and Prediction of Modulus of Rupture and Modulus of Elasticity of Engineered Cementitious Composites (ECCs) Using Dual-Frequency Correlation

Nanopore in C-S-H Gel Stability Analysis of Hardened Cement Pastes

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