Quantification of Heat Evolution During Hydration Process of Cement in Concrete

Suzuki, Yasunori; Tsuji, Yukikazu; Maekawa, Koichi; Okamura, Hajime

doi:10.2208/jscej.1990.414_155

Cited by 7 publications

(6 citation statements)

References 4 publications

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“…[60], the activation energy E i /R depends on the mineral i ∈(C 3 S, C 2 S, C 3 A, C 4 AF) and the stage of hydration. Indeed, the apparent activation energy decreases towards 21 kJ/mol during the diffusion stage of hydration [65]. It must be noticed that this activation energy is comparable to the activation energy for ion diffusion in water (18 kJ/mol) [66].Consequently, the activation energies are lower for the minerals that hydrate later :…”

Section: Acceleration Of Hydration Reactions With Temperaturementioning

confidence: 89%

Estimating the mechanical properties of hydrating blended cementitious materials: An investigation based on micromechanics

Lavergne¹,

Fraj²,

Bayane³

et al. 2018

Cement and Concrete Research

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The hydration model of Parrot & Killoh (1984) [1] has been extended to blended cements and coupled to a micromechanical scheme similar to that of Pichler & Hellmich (2011) [2] to estimate the Young modulus and the compressive strength of cementitious materials as a function of time. A finite aspect ratio of 7 is introduced to describe the shape of the hydrates and improve the estimate of the early age strength by the micromechanical scheme. Furthermore, accounting for the stress fluctuations in the cement paste partly explains the fact that the compressive strength of a concrete can be lower than that of its cement paste. Finally, the estimated physical properties are compared to numerous experimental measurements from the literature and new experimental measurements on blended cement pastes featuring significant weight fractions of limestone filler, fly ash or silica fume. It is shown that the present model slightly overestimates the dilution effect.

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Section: Acceleration Of Hydration Reactions With Temperaturementioning

confidence: 89%

Estimating the mechanical properties of hydrating blended cementitious materials: An investigation based on micromechanics

Lavergne¹,

Fraj²,

Bayane³

et al. 2018

Cement and Concrete Research

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show abstract

“…It has been shown that there is a strong correlation between compressive strength and degree of hydration. For the Cap Concrete, the heat of hydration has been measured using an adiabatic calorimeter at two starting temperatures, 23 o C and 40 o C. Using the Arrhenius function [18], the heat of hydration as a function of time may be converted into a function of degree of hydration, as shown in Appendix A. Thus, while the measured heat of hydration in an adiabatic calorimeter is over a range of temperatures, the equivalent heat of hydration variation with time at a constant temperature of 23 o C can be calculated knowing the Arrhenius parameters.…”

Section: Humidity Profile Developmentmentioning

confidence: 99%

“…Thus, the concrete temperature was not constant. The effect of temperature on the rate of heat generation per unit weight, H, at any age can be determined by the relation [18],…”

Section: Recommendations Path Forward or Future Workmentioning

confidence: 99%

Testing and Analysis of Cap Concrete Stress and Strain Due to Shrinkage, Creep, and Expansion Final Report

Guerrero¹,

Restivo²

2011

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“…where D is a constant to be determined through the minimisation of the difference of experimental data 5 and the relevant simulation values. The comparative study suggests the value of D to be about 2·0 which is adopted in this study.…”

Section: Maximum Heat Of Hydration Of Mineral Compound In Cementmentioning

confidence: 99%

“…The latter includes the models proposed by Kishi and Maekawa 3 and Swaddiwudhipong et al 4 The temperature development in early age concrete is a major concern as thermal cracks may develop in thick concrete sections if appropriate measures are not considered. Suzuki et al 5 developed a heat of hydration model capable of assessing the exothermic hydration process of cement in concrete at various temperature histories. They introduced two material functions in their numerical model: (a) the thermal activity which is closely related to the temperature factor; and (b) the reference rate of the hydration heat released by cement at a constant …”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of temperature rise of highstrength concrete incorporating silica fume and superplasticiser

Swaddiwudhipong

Zhang

2003

Advances in Cement Research

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A numerical model is proposed to predict the process of adiabatic temperature rise of high-strength concrete (HSC) incorporating silica fume (SF) and superplasticisers. On the basis of predicting the exothermic hydration process of plain concrete, the proposed numerical model takes the retardation caused by the superplasticisers and the effect caused by the SF into consideration. The verification of the proposed model is carried out with several groups of experimental data on concrete at different water to cementitious material ratios and initial temperatures. This numerical model is able to predict the adiabatic temperature history of HSC with SF and superplasticiser. The computing model requires the following relevant material parameters, namely, the mineral composition of Portland cement, the amount of SF, the dosage of superplasticiser, mix proportions and initial placing temperature of concrete. The model is useful in the prediction of heat of hydration, temperature distribution in mass concrete providing useful information on de-moulding at early ages and on controlling the potential thermal cracking.

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Quantification of Heat Evolution During Hydration Process of Cement in Concrete

Cited by 7 publications

References 4 publications

Estimating the mechanical properties of hydrating blended cementitious materials: An investigation based on micromechanics

Estimating the mechanical properties of hydrating blended cementitious materials: An investigation based on micromechanics

Testing and Analysis of Cap Concrete Stress and Strain Due to Shrinkage, Creep, and Expansion Final Report

Numerical simulation of temperature rise of highstrength concrete incorporating silica fume and superplasticiser

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