Role of porosity on the stiffness and stability of (001) surface of the nanogranular C–S–H gel

Sekkal, W.; Zaoui, A.; Benzerzour, M.; Abriak, N.‐E.

doi:10.1016/j.cemconres.2016.04.014

Cited by 31 publications

(8 citation statements)

References 61 publications

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“…After 3d curing, C-S-H gel with dense structure and fewer pores were formed, which were wrapped with cement clinker; After 7d curing, a large number of ettringite crystals were formed, indicating that the admixture can promote cement hydration reaction, and AFt crystals were generated with expansion effect. The C-S-H gel and AFt were densely and uniformly cross-bonded together, thereby increasing the strength of the material (Li 2018b;Termkhajornkit et al 2015;Sekkal et al 2016).…”

Section: Microscopic Characterization Of Sealing Materialsmentioning

confidence: 99%

WITHDRAWN: Strength Analysis and Ratio Optimization of New Sealing Materials With Response Surface Method

Xue

Guo

et al. 2020

Preprint

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The influence of the interaction among water-cement ratio, content of expansion agent, water reducing agent, and retarder on the compressive strength of new sealing material was studied. The Design-Expert software was used to design experiments, establish a quadratic polynomial regression model, draw response surface, and optimize parameters. The microstructure morphology of the sample is explored by scanning electron microscope (Hereinafter referred to as SEM). The research results show that the interaction between water-cement ratio and expansion agent content is the most crucial factor affecting the compressive strength of the new sealing material. Under the optimal condition of 0.4% water reducing agent, 0.04% retarder, 0.8 water-cement ratio, and 8% expansion agent, the compressive strength of the sealing material cured for 3 d and 7 d is 39.247 MPa and 41.044 MPa, with the maximum absolute error of 1.71% and 2.81%, which proves the high accuracy of the model. The main hydration products of the new sealing material are ettringite and C-S-H gel, interlacing each other to form a dense structure, which contributes to the high strength of the new sealing material.

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Section: Microscopic Characterization Of Sealing Materialsmentioning

confidence: 99%

WITHDRAWN: Strength Analysis and Ratio Optimization of New Sealing Materials With Response Surface Method

Xue

Guo

et al. 2020

Preprint

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“…There are ranges of values for the elastic properties of C-S-H inner and outer products, depending on their porosity. In the present study, the average values reported in Table 4 are adopted, in accordance with the recent study carried out by Sekkal et al [32]. Note that the elastic properties of the unreacted cement were previously given in Table 2.…”

Section: Beam Elementsmentioning

confidence: 70%

Microstructure-Based Prediction of the Elastic Behaviour of Hydrating Cement Pastes

Mazaheripour

Faria

et al. 2018

Applied Sciences

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The development of the elastic properties of a hardening cement paste results from the microstructural evolution due to cement hydration. The elastic behaviour of cement paste can be predicted by a combination of the hydration model and micromechanical analysis, which originates from a microstructural representative volume where the elastic behaviour of different hydrating cement products can be recognised. In this paper, the formation of the microstructural volume is simulated with the computational code HYMOSTRUC3D for cement hydration. The obtained microstructure is an input for a micromechanical modelling. A 3D regular lattice model is proposed to predict the elastic modulus of the microstructure, considering a water-to-cement (w/c) ratio within the range [0.30-0.50]. In addition, the Finite Element Method (FEM) is used to compare and validate the results from the lattice model. Predictions from these two modelling approaches are then compared to the experimental results provided by the EMM-ARM (Elasticity Modulus Measurement through Ambient Response Method) testing technique, the latter allowing measurement of the elastic modulus of hydrating cement pastes. Finally, the above-referred numerical models are used to evaluate the influence of the following features: the particle size distribution of the cement grains, the microstructure discretisation refinement and the elastic modulus of the C-S-H cement hydration product.

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“…According to the above formulas, the main product of the chemical reaction is calcium silicate hydrate (

) [ 37 , 38 , 39 ]. In the complex production process, C-S-H generated by hydration reaction can account for 60–70% of the total number of hydration products [ 40 ]. However, C-S-H is a porous material with a pore radius of 0.5~1 nm, which is composed of multiple C-S-H slices and 18% nanoporosity [ 41 ].…”

Section: Resultsmentioning

confidence: 99%

Correlation Analysis between Microscopic Pore Parameters and Macroscopic Mechanical Properties of Rock-like Materials from the Perspective of Water-Cement Ratio and Sand-Cement Ratio

2022

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To explore the effects of water-cement ratio and sand-cement ratio on micro-pore structure characteristics and macroscopic mechanical properties and thus improve the understanding of rock-like materials, the mechanical test and detection of micro-pore structure combining NMR and SEM were carried out. The effects of WCR and SCR on different porosity parameters and mechanical properties were discussed. The correlation and internal relationship between mechanical properties and parameters of different porosities and fractal dimensions were analyzed. Experimental results showed that the different porosity parameters and fractal dimensions increased with the increase in WCR. 1.0 (SCR) was the turning point of different porosity parameters and fractal dimensions. When the SCR was less than 1.0, the porosity parameters and fractal dimension gradually decreased, while when the SCR was greater than 1.0, the porosity parameters and fractal dimension gradually increased. Microscopic porosity parameters and fractal dimension played an important role in the influence of experimental factors on mechanical properties. Different porosity parameters and fractal dimensions were negatively correlated with mechanical properties. Compressive strength and different porosity parameters conformed to a good exponential relationship, while the fitting relationship between tensile strength and mechanical properties was not obvious. This study can provide a reference for the follow-up study of rock-like materials.

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Role of porosity on the stiffness and stability of (001) surface of the nanogranular C–S–H gel

Cited by 31 publications

References 61 publications

WITHDRAWN: Strength Analysis and Ratio Optimization of New Sealing Materials With Response Surface Method

WITHDRAWN: Strength Analysis and Ratio Optimization of New Sealing Materials With Response Surface Method

Microstructure-Based Prediction of the Elastic Behaviour of Hydrating Cement Pastes

Correlation Analysis between Microscopic Pore Parameters and Macroscopic Mechanical Properties of Rock-like Materials from the Perspective of Water-Cement Ratio and Sand-Cement Ratio

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