Multiphase pozzolanic reaction model of low-calcium fly ash in cement systems

Wang, Tiao; Ishida, Tetsuya

doi:10.1016/j.cemconres.2019.04.015

Cited by 65 publications

(15 citation statements)

References 17 publications

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“…After adding 30% cenospheres, the compressive strength decreased by about 70% after 28 and 56 days of maturation. A similar phenomenon was described in [ 71 ]. The decrease in strength was due to the low strength of the cenosphere and the reduction in Portland cement within the mortar.…”

Section: Resultssupporting

confidence: 84%

Analysis of the Possibility of Using Cenospheres in the Production of Cement Mortars for Use in an Elevated Temperature Environment

Rutkowska

Ogrodnik

Żółtowski

et al. 2022

Sensors

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The topic of research included in this article was the evaluation of the influence of cenospheres on selected parameters of mortar cement. Samples were designed as CEM I 42.5 R Portland cement with the application of different additive amounts. In the experimental work, the consistency, compressive strength, and bending strength were tested after 28 and 56 days of maturation, and after heating temperatures of 20, 300, 500, and 700 °C. The compressive strength was tested on half beams (40 × 40 × 160 mm). Using the obtained results, the properties of the mortars were compared. The research confirmed the possibility of producing cenosphere-modified cement mortars. Cenospheres used in the preparation of cement mortar negatively affected the bending and compressive strength with increasing temperature (20, 300, 500, 700 °C) and increasing content of this additive (10, 20, 30%).

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Section: Resultssupporting

confidence: 84%

Analysis of the Possibility of Using Cenospheres in the Production of Cement Mortars for Use in an Elevated Temperature Environment

Rutkowska

Ogrodnik

Żółtowski

et al. 2022

Sensors

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show abstract

“…The different pozzolanic reaction products can be attributed to the difference in chemical composition of fly ash investigated in their studies. In this study, the chemical reactions proposed by Bentz et al [17] were used to develop a hydration model for fly ash blended cement system, because the hydration products given in [17] have specific composition and fly ash particles consisting of multiple phases that are close to the real situation [41].…”

Section: Theory Of Hydration Of Fly Ash Blended Cement Systemmentioning

confidence: 99%

Modelling of 3D microstructure and effective diffusivity of fly ash blended cement paste

Liu

Wang

Zhang

2020

Cement and Concrete Composites

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Accurate prediction of microstructural evolution and ionic diffusivity in fly ash blended cement paste is significant for practical application and durability design of blended cementitious materials. This paper presents an integrated modelling framework for simulating 3D microstructure and effective ionic diffusivity of blended cement paste with various fly ash replacement levels and w/b ratios. A voxel-based hydration model using cellular automaton-like evolution rules was developed to simulate 3D microstructural development of fly ash blended cement, based on which the effective diffusivity was simulated using a lattice Boltzmann (LB) model for diffusion considering the contributions of both capillary pores and gel pores in C-S-H gels to ionic diffusion. A series of experiments were conducted to characterise the morphology of Portland cement and fly ash, hydration process and pore structure of fly ash blended cement paste and measure the effective ionic diffusivity.The simulation results agree well with experimental data in terms of hydration heat, calcium hydroxide content, degree of hydration of fly ash, porosity, and effective diffusivity, which suggests that the developed microstructure-based LB model for diffusion can predict the ionic diffusivity of fly ash blended cement paste with high accuracy. The addition of fly ash can help reduce the ionic diffusivity of cement paste particularly after the capillary porosity depercolation occurs due to the more tortuous diffusion paths in the pozzolanic C-S-H gels.

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“…Kadela [19] showed the potential of a foamed concrete layer as the base of a pavement structure. As a typical pozzolanic material, fly ash can improve the hydration and compactness of a material's microstructure when it is used in cement-treated soil systems [20][21][22][23][24][25]. Most importantly, the expansive stress caused by the late hydration of high-sulphur fly ash can be buffered by the numerous pores in cement-treated materials.…”

Section: Introductionmentioning

confidence: 99%

Influences of High-Sulphur Fly Ash on the Properties of Lightweight Cement-Treated Materials Subjected to Sulphate Corrosion

et al. 2020

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In this study, the effects of high-sulphur fly ash on the properties of lightweight cement-treated materials (LCMs) immersed in sodium sulphate solutions were studied. The unconfined compressive strength of LCMs corroded by sulphate was tested. The microscopic properties were characterised by X-ray diffraction (XRD), electrochemical impedance spectroscopy (EIS), and scanning electron microscopy (SEM). The results show that high-sulphur fly ash has an adverse effect on the structural strength of LCMs after corrosion, but when the content of fly ash is less than 75%, the effect of fly ash on the strength is small. A small amount of high-sulphur fly ash can improve the density of the material structure; the internal pore structure of LCMs provides space for the growth of ettringite and other corrosive substances and relieves the expansion pressure. LCMs mixed with high-sulphur fly ash have a certain resistance to sodium sulphate corrosion.

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Multiphase pozzolanic reaction model of low-calcium fly ash in cement systems

Cited by 65 publications

References 17 publications

Analysis of the Possibility of Using Cenospheres in the Production of Cement Mortars for Use in an Elevated Temperature Environment

Analysis of the Possibility of Using Cenospheres in the Production of Cement Mortars for Use in an Elevated Temperature Environment

Modelling of 3D microstructure and effective diffusivity of fly ash blended cement paste

Influences of High-Sulphur Fly Ash on the Properties of Lightweight Cement-Treated Materials Subjected to Sulphate Corrosion

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