On Effect of Superplasticizers and Mineral Additives on Creep Factor of Hardened Cement Paste and Concrete

Nesvetaev, Grigory; Korchagin, I.V.; Lopatina, Y.Y.

doi:10.4028/www.scientific.net/ssp.265.109

Cited by 11 publications

(13 citation statements)

References 4 publications

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“…To assess the effect of SP, MA, cement properties and mix proportion of concrete on the shrinkage of concrete, the model [26] for determination of the modulus of elasticity and the coefficient of creep of concrete can be used:…”

Section: Discussionmentioning

confidence: 99%

On effect of superplasticizers and mineral additives on shrinkage of hardened cement paste and concrete

2018

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A model describing the variation in autogenous shrinkage and drying shrinkage of portland cement concrete, depending on the volume of aggregates and the shrinkage of hardened cement paste, is presented. The equation to calculate shrinkage of concrete as a function of the volume of aggregates and shrinkage of a hardened cement paste was proposed. Formulas are proposed that describe the change in the shrinkage of hardened cement paste as a function of water/cement. The results of studies of the effect of superplasticizers and mineral additives on the autogenous shrinkage and the drying shrinkage of hardened cement paste are presented. Concretes made with superplasticizer and mineral additive may have the potential lower the value of drying shrinkage. The shrinkage value can be lowered from 30% till 70%. Concretes containing superplasticizers and mineral additives can potentially have the autogenous shrinkage reduced to 75%, or increased to 180%.

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Section: Discussionmentioning

confidence: 99%

On effect of superplasticizers and mineral additives on shrinkage of hardened cement paste and concrete

2018

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“…As is known, the SP can influence the hydration process of cement, including tensile [1][2][3][4][5], especially in the early stages, which may be accompanied by a change in the quantitative composition of ions in the pore fluid, which may change the kinetics of gassing.…”

Section: The Main Partmentioning

confidence: 99%

Coefficients for Calculation of Deformation-Strength Characteristic of Concrete for Injection with Two-Stage Expansion

Nesvetaev

Koryanova

Zhilnikova

2018

SSP

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Strength of concrete is a function of several variables, such as: water / cement ratio, portland cement activity, filler quality, etc., adjusting which you can achieve the required strength. However, the introduction of the concrete admixtures, changing holding conditions of the samples, the volume restriction can affect the strength of the due to exposure impacts both the kinetics of hydration processes and on the structure formation of cement paste. The article presents the results of investigation the influence of the amount of gas-forming admixture, the presence, type and amount of superplasticizer, the ratio sand / cement, aggregate size and water-cement ratio on gassing and expansion of the mixture in the first stage and propose coefficient of effectiveness of gassing and of expansion. The authors proposed a formula to describe the dependence of the relative deformations of expansion of the concentration of aggregate. In order to assess the conditions in which there is a mixture, it is proposed to use the indicator - coefficient of congestion of expansion, to account for the influence of hardening conditions on the strength of the concrete - coefficient hardening conditions. The authors proposed to consider the impact of prescription and technological factors by introducing system of correction coefficients.

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“…It is also possible that the structural relationship between drying shrinkage of the RPC and the water-reducing properties of stone powder and superplasticizers exists due to the characteristics change of the modified cement matrix pore solution [16,17].…”

Section: Introductionmentioning

confidence: 99%

The influence of stone powder origin and superplasticizer type in the drying shrinkage of RPC

Korotkikh,

Kapustin,

Panikin

2023

E3S Web Conf.

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In the presented study, the combined effect of stone powder from mineral rocks (basic and acidic) and superplasticizers (naphthaleneand polycarboxylate-based) on drying shrinkage processes and moisture loss in Reactive Powder Concrete (RPC) is considered. Due to the peculiarities of the RPC structure, the moisture shrinkage is not restrained by the coarse skeleton and is completely determined by the characteristics of a hardening cement matrix modified with mineral additives. The paper shows that the balance of forces of internal interaction in the solid and liquid phases during the formation of the cement matrix is greatly influenced by stone powder and its origin. It has been established that the shrinkage of the RPCs with NF-based Polyplast SP-1 is higher than with PCB-based Glenium Ace 30. It was also found that shrinkage processes in RPC containing stone powder from granite and quartz sand do not always correspond to the internal moisture loss rate. Perhaps, due to the high strength of the RPC with stone powder from the listed rocks, a resistance to volumetric change increases during moisture loss, which in turn leads to a decrease in shrinkage deformations.

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On Effect of Superplasticizers and Mineral Additives on Creep Factor of Hardened Cement Paste and Concrete

Cited by 11 publications

References 4 publications

On effect of superplasticizers and mineral additives on shrinkage of hardened cement paste and concrete

On effect of superplasticizers and mineral additives on shrinkage of hardened cement paste and concrete

Coefficients for Calculation of Deformation-Strength Characteristic of Concrete for Injection with Two-Stage Expansion

The influence of stone powder origin and superplasticizer type in the drying shrinkage of RPC

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