Hydration heat evolution and kinetics of blended cement containing steel slag at different temperatures

Han, Fuzhu; Zhang, Zengqi; Wang, Dongmin; Yan, Peiyu

doi:10.1016/j.tca.2015.02.018

Cited by 227 publications

(49 citation statements)

References 30 publications

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“…That decline was consistent with the tendency observed by Han et al [42] and Liu et al [37], who analysed the effect of blast furnace slag and basalt, respectively, on total heat. They reported that heat of hydration declined with rising replacement ratios, inasmuch as the additions studied did not act as nucleation sites that would favour the deposit and growth of hydration products.…”

Section: Total Heat Of Hydrationsupporting

confidence: 92%

New additions for eco-efficient cement design. Impact on calorimetric behaviour and comparison of test methods

et al. 2016

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The pursuit of new alternative construction materials has intensified substantially in recent years due to the economic, technical and environmental benefits deriving from their use. The study of the effect of such materials on heat of hydration is of particular importance, for any rise in that parameter may shorten the service life of concrete structures considerably. This paper describes an in-depth study of including clay-based sanitary ware (SW) and construction and demolition (CDW) waste as active additions in clinker manufacture and their effect on the total heat of hydration measured with isothermal and semi-adiabatic calorimetry. Clay-based SW waste induced a greater decline in the heat production rate, temperature rise and total heat than CDW waste. Moreover, the downslopes steepened with increasing replacement ratios. A linear relationship was observed between the values for total heat of hydration found with the two test methods. The type of waste, replacement ratio and the interaction between these two parameters had a significant impact on heat of hydration.

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Section: Total Heat Of Hydrationsupporting

confidence: 92%

New additions for eco-efficient cement design. Impact on calorimetric behaviour and comparison of test methods

et al. 2016

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“…Nowadays, an increasing amount of supplementary cementitious materials (SCMs) have been used in the preparation of cement concrete, eg, fly ash, 2-6 steel slag, [7][8][9][10][11] silica fume, 4,[12][13][14][15] and ground granulated blast furnace slag (GGBS). 13,[16][17][18][19] In addition to the chemical reaction, these mineral admixtures also have some impacts on the early hydration of cement due to their physical presence which is generally named as filler effect.…”

Section: Introductionmentioning

confidence: 99%

A new hydration kinetics model of composite cementitious materials, Part 2: Physical effect of SCMs

et al. 2020

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This paper is the second part of an overall research project that aims to model the hydration kinetics of composite cementitious materials. The new hydration kinetic model of Portland cement was constructed in the first part of this research project. The aim of this part is to characterize the physical effect of SCMs by modifying some kinetic parameters of the hydration kinetic model of cement. In this paper, the filler effect of SCMs is attributed to the “dilution effect”, “nucleation effect” and “accelerated dissolution effect”. The dilution effect is considered by introducing the actual water/cement ratio into the kinetic model. The nucleation surface area, nucleation and growth rates are modified to account for the nucleation effect and accelerated dissolution effect of fillers. The simulative fit results show that the extra contribution of SCMs due to their filler effect on hydration of cement at early ages has an upper limit: at most 20% extra nucleation surface area, 30% extra nucleation ratio and 40% extra growth ratio of calcium silicate hydrate (CSH). The new modified kinetic model and the value‐taking method of the newly introduced parameters are verified by simulative fitting to the kinetic data from reference. The apparent activation energies of the nucleation rate, growth rate, and diffusion rate are approximately 35 kJ/mol, 36 kJ/mol and 38.5 kJ/mol, which are slightly smaller than those of the pure Portland cement reported in the first part of this research project.

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“…As presented in Figure , the cross section of the 30 years' hydrated cement particle shows an obvious hydration product layer and the schematic diagram of simplified concentric model is similar to that of the Jander's model, which is a classical mass continuity‐based diffusion model. Jander's model has been applied to describe the late hydration of cement in many complete hydration models, eg the Krstulovic‐Dabic model . The mathematical expression of the Jander's model is given in Equation .

\frac{d α}{d t} = \frac{2 M_{normalP} C_{0}}{R_{0}^{2} ρ_{normalP}} \cdot D \cdot \frac{{(1 - α)}^{2 true/ 3}}{1 - {()(, 1 - α)}^{1 / 3}}

where

α

is the reaction degree and D is the diffusion coefficient.…”

Section: Introductionmentioning

confidence: 99%

“…Jander's model has been applied to describe the late hydration of cement in many complete hydration models, eg the Krstulovic-Dabic model. [24][25][26] The mathematical expression of the Jander's model is given in Equation 1. where is the reaction degree and D is the diffusion coefficient. During the derivation process of Jander's model, the diffusion coefficient (D) is supposed to be a constant.…”

Section: Introductionmentioning

confidence: 99%

A new hydration kinetics model of composite cementitious materials, part 1: Hydration kinetic model of Portland cement

et al. 2019

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This work is the first part of an overall research project that aims to model the hydration kinetics of modern composite cementitious materials. The aim of this part is to build a hydration kinetic model to characterize the hydration behavior of cement at all ages. In this paper, the nucleation and growth of CSH and the diffusion of water are described by a modified BNG model and a modified Jander's model. The kinetic parameters are obtained by simulative fitting of the model to the experimental data. The linear functions between the nucleation and growth rates and the W/C ratios are given in this paper. The apparent activation energy of the nucleation rate constant, growth rate constant, and generalized diffusion constant are approximately 36.0, 37.5, and 42.0 kJ/mol, respectively. Finally, the phase compositions of hardened cement paste are calculated according to the kinetic model and the reaction formula of cement.

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Hydration heat evolution and kinetics of blended cement containing steel slag at different temperatures

Cited by 227 publications

References 30 publications

New additions for eco-efficient cement design. Impact on calorimetric behaviour and comparison of test methods

New additions for eco-efficient cement design. Impact on calorimetric behaviour and comparison of test methods

A new hydration kinetics model of composite cementitious materials, Part 2: Physical effect of SCMs

A new hydration kinetics model of composite cementitious materials, part 1: Hydration kinetic model of Portland cement

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