A two-stage model for the prediction of mechanical properties of cement paste

Krishnya, Siventhirarajah; Yoda, Yuya; Elakneswaran, Yogarajah

doi:10.1016/j.cemconcomp.2020.103853

Cited by 27 publications

(3 citation statements)

References 49 publications

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“…Concrete's compressive strength is regarded as the foremost significant mechanical characteristic, typically ascertained subsequent to a curing period of 28 days [49]- [51].…”

Section: Model Optimizationmentioning

confidence: 99%

Performance of high strength concrete containing locust bean pod ash as cement replacement

Isa,

Johari,

Anum

et al. 2023

Res. Eng. Struct. Mat.

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“…Concrete's compressive strength is regarded as the foremost significant mechanical characteristic, typically ascertained subsequent to a curing period of 28 days [49]- [51].…”

Section: Model Optimizationmentioning

confidence: 99%

Performance of high strength concrete containing locust bean pod ash as cement replacement

Isa,

Johari,

Anum

et al. 2023

Res. Eng. Struct. Mat.

View full text Add to dashboard Cite

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“…The widely used and freely available geochemical software PHREEQC has been shown by the authors of [1] to be capable of predicting the hydration behaviour of Portland cement over time using an appropriate thermodynamic database and the molar reaction equations for the four main clinker phases alite (Ca 3 SiO 5 , C 3 S), belite (Ca 2 SiO 4 , C 2 S), aluminate (Ca 3 Al 2 O 6 , C 3 A) and aluminoferrite (Ca 4 Al 2 Fe 3 O 10 , C 4 AF). PHREEQC employs the law of mass action equations to perform complex geochemical simulations, allowing for the inclusion of kinetics and rates, details of which can be found in the literature [2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Employing Discrete Solid Phases to Represent C-S-H Solid Solutions in the Cemdata07 Thermodynamic Database to Model Cement Hydration Using the PHREEQC Geochemical Software

2022

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This paper presents a cement hydration model over time using the cemdata07 thermodynamic database and a series of derived discrete solid phases (DSPs) to represent calcium silicate hydrate (C-S-H) as a binary solid solution with two end-members. C-S-H in cement is amorphous and poorly crystalline with a range of molar Ca/Si ratios from 0.6 to 1.7. It displays strongly incongruent dissolution behaviour, where the release of calcium into solution is several orders of magnitude greater than silicon. It is, therefore, important that any cement hydration model provides a credible account of this behaviour. C-S-H has been described in the cemdata07 thermodynamic database as a number of solid solutions using different end-members with differing levels of complexity. While solid solutions can be included in most modern geochemical software programs, they often lead to a significant increase in computation time. This paper presents how an incongruent solid solution between two C-S-H end-members may be represented as a number of DSPs to model cement hydration over time using the PHREEQC geochemical software. By using DSPs rather than modelling C-S-H as a nonideal solid solution, this gives the user full control of the input for the model, reducing the computational demand and analysis time with no loss in accuracy in predicting stable-phase assemblages and their associated pore chemistry over time.

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“…Mainly, the formation of the structure of high-strength material is determined by the packing density of new formations [35,36]. The microstructure can be regulated by the usage of modifiers of different origins and dispersion degrees.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ultrafine Additives on the Morphology of Cement Hydration Products

et al. 2021

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The present research is focused on the investigation of the influence of ultrafine additives on the structure formation of hardened cement paste and the establishment of the mechanisms of the morphological transformations, which determine the properties of hydrated products. In the course of the research, the modification of ordinary Portland cement was performed by the suspension of multi-walled carbon nanotubes (MWCNTs), carbon black (CB) paste, and silica fume (SF). Scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) microanalysis, X-ray diffraction (XRD) analysis, thermal analysis, and Fourier-transform infrared (FTIR) spectroscopy were used to study cement hydration products. The morphology of hardened cement paste depends on the chemical reactivity of additives, their geometry, and their genesis. The action mechanism of the inert carbon-based additives and pozzolanic silica fume were considered. The cement hydration products formed in the process of modification by both types of ultrafine additives are described. In the case of the modification of cement paste by inert MWCNTs and CB paste, the formation of cement hydration products on their surface without strong adhesion was observed, whereas in the case of the addition of SF separately and together with MWCNTs, the strong adhesion of additives and cement hydration products was noted.

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A two-stage model for the prediction of mechanical properties of cement paste

Cited by 27 publications

References 49 publications

Performance of high strength concrete containing locust bean pod ash as cement replacement

Performance of high strength concrete containing locust bean pod ash as cement replacement

Employing Discrete Solid Phases to Represent C-S-H Solid Solutions in the Cemdata07 Thermodynamic Database to Model Cement Hydration Using the PHREEQC Geochemical Software

Effect of Ultrafine Additives on the Morphology of Cement Hydration Products

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