Mechanical properties of cement paste curing at different isothermal conditions

Gnyrya, A. I.; Abzaev, Yu. A.; Korobkov, S. V.; Gauss, K.

doi:10.1088/1755-1315/193/1/012010

Cited by 8 publications

(3 citation statements)

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“…Of certain interest is agreement between the experimental data and VCCTL modelling of the cement strength properties. We compare the values of the yield stress [12] obtained at 20, 40, 50 and 70 о С, depending on the curing time and predicted values of Young's modulus at a 0.4 water-cement ratio.…”

Section: Resultsmentioning

confidence: 99%

The temperature effect on portland cement strength

et al. 2019

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The paper presents the results of predictive modelling of the curing mechanism of the type CEM I 42.5B Portland cement using the VCCTL tool. The cement curing is studied during 28 days within the 0–99 оС temperature range. It is shown that the degree of Portland cement hydration is ~0.55 at 10 оС, and with the temperature increase the hydration process substantially intensifies. The hydration degree of 0.75 is achieved after 50 hours at a temperature over 90 оС. The VCCTL modelling is used to determine the quantitative content of the initial minerals and the main reaction products calcium silicate hydrate comprising C-S-H and portlandite (CH). Their total amount significantly grows during the indicated time period. In Portland cement, the amount of clinker minerals decreases, whereas the fraction of hydrated cement comprising C-S-H and CH achieves 0.70 of the solid phase and pore space. The temperature has a great effect on these processes. The pore space reduces with the increasing time and temperature. It is found that the effective elastic moduli of Portland cement rapidly grow during 400 hours and achieve the following values: 16.79 MPa for the bulk modulus, 8.90 MPa for the shear modulus and 22.69 MPa for Young’s modulus. The equivalence of the VCCTL modelling of cement curing is examined by a search for the correlation between the experimental values of the yield stress at 20, 40, 50 and 70 оС and Young’s modulus. With a high degree of reliability, this correlation matches the cubic function which is in agreement with the literature data.

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Section: Resultsmentioning

confidence: 99%

The temperature effect on portland cement strength

et al. 2019

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“…The yield stress of Portland cement was used as its strength property, and its values were averaged over three points. These experiments constituted a part of our previous research [10,11].…”

Section: Methodsmentioning

confidence: 99%

In-situ curing mechanism of Portland cement

et al. 2019

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The paper presents the results of predictive modelling of the curing mechanism of the type CEM I 42.5B Portland cement using the VCCTL tool. The curing lasts during 28 days at 20 оС and the water-cement (W/C) ratio of 0.26, 0.30, 0.35 and 0.40. It is shown that the degree of Portland cement hydration is ~0.70 after 28-day curing. The growth in the W/C ratio significantly intensifies the hydration rate and the dissolution of clinker minerals. The amount of the main hydration products calcium silicate hydrate (C-S-H) and portlandite considerably increases with the W/C ratio. In Portland cement, the fraction of hydrated cement achieves 0.60 of the solid phase and the pore space. It is found that the effective elastic moduli rapidly increase during 400 hours, and then monotonely lower down to 16.79 GPa for the bulk modulus, 8.90 GPa for the shear modulus and 22.69 GPa for Young’s modulus. Relatively high values of the effective elastic moduli are explained by the higher content of the clinker phases and, probably, the higher degree of C-S-H crystallinity. The dependence between the yield stress and Young’s modulus is in good agreement with the VCCTL microstructural model of Portland cement curing.

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“…Решение связанной задачи расчетов прочностных характеристик и термических напряжений в программном комплексе Elcut Pro показало, что в стержне в исследуемом интервале температур и времени твердения термические напряжения Мизеса оказываются незначительными по сравнению с экспериментальными значениями предела текучести. На существенный вклад в распределение напряжений вдоль стержня оказывает влияние тепломассоперенос [2,3], связанный с перераспределением влаги вдоль стержня и, как следствие, химическая усадка пескоцементов, зависящая от температуры и водоцементного отношения. В работе обсуждаются различные механизмы накопления прочности пескоцементов, связанные с температурным перераспределением влаги в условиях градиентов температур.…”

Section: томский государственный архитектурно-строительный университеunclassified

MODELIROVANIE TVERDENIYa PESKOTsEMENTOV V USLOVIYaKh GRADIENTOV TEMPERATUR

2020

Mezhdunarodnaya Konferentsiya "Fizicheskaya Mezomekhanika. Materialy S Mnogourovnevoy Ierarkhicheski Organizovannoy Strukturoy

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Mechanical properties of cement paste curing at different isothermal conditions

Cited by 8 publications

References 1 publication

The temperature effect on portland cement strength

The temperature effect on portland cement strength

In-situ curing mechanism of Portland cement

MODELIROVANIE TVERDENIYa PESKOTsEMENTOV V USLOVIYaKh GRADIENTOV TEMPERATUR

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