Creep and Shrinkage Behaviour of Disintegrated and Non-Disintegrated Cement Mortar

Gailitis, Rihards; Figiela, Beata; Abelkalns, Kalvis; Sprince, Andina; Šahmenko, Genādijs; Choińska, Marta; Guigou, Martin Duarte

doi:10.3390/ma14247510

Cited by 4 publications

(3 citation statements)

References 27 publications

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“…For concrete materials, shrinkage refers to the concrete volume reduction in the hardening process of cement, and creep refers to the phenomenon that the strain of concrete increases with time under constant stress. Both creep and shrinkage are the inherent time-variance characteristics of the material itself [ 1 ], which is an important content of concrete structure design and calculation, having significant impacts on the performance of concrete structural components and systems. Creep and shrinkage affect stress distribution, widespread cracking, and excessive deformation, most of which have adverse effects on the long-term properties, usability, and durability of concrete building structures [ 2 , 3 , 4 , 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Statistical Evaluation of CEB-FIP 2010 Model for Concrete Creep and Shrinkage

et al. 2023

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An extensive experimental database consisting of 2838 shrinkage data points and 3598 creep data points is used to evaluate the accuracy of the newly proposed CEB-FIP 2010 model in predicting the creep and shrinkage of concrete structures. To study the applicability of the model for high-strength concrete in general environments, the database was developed by only retaining the test data of concrete components with the average compressive strength greater than 30 MPa and the relative humidity in the test environment less than 95%. On this basis, combined with the B3 and CEB variation coefficient methods, the paper mainly adopts the residual method to assess the accuracy of the CEB-FIP 2010 model and compare it with the previous model, CEB-FIP 1990. The influences of several properties, such as the compressive strength, the age of concrete, the relative humidity, and the component size on the prediction accuracy of these two models are further studied. The results show that for the CEB-FIP 2010 model within the time interval of 0–9000 days, 52% and 48% of the shrinkage strain residuals of the total specimens are located in the negative and positive regions, respectively, while the positive and negative regions of the CEB-FIP 1990 model account for 73% and 27%, demonstrating the CEB-FIP 2010 model has better performance in predicting shrinkage strain than the CEB-FIP 1990 model, whereas the two models have comparable accuracy in predicting creep compliance. The CEB-FIP 2010 model is more reliable for considering the effects of compressive strength, relative humidity, and age at loading on shrinkage and creep than for considering the effect of member size.

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Section: Introductionmentioning

confidence: 99%

Statistical Evaluation of CEB-FIP 2010 Model for Concrete Creep and Shrinkage

et al. 2023

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“…A review of the literature shows that the development of effective unified computational algorithms for solving physically nonlinear problems of the dynamics of short-term and long-term deformation of shells and plates made of composite materials is an urgent problem today [ 30 , 31 ].…”

Section: Introductionmentioning

confidence: 99%

Creep of Concrete in Shell Structures: Nonlinear Theory

Mussabayev,

Nuguzhinov,

Nemova

et al. 2023

Materials

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The creep of concrete is one of the main problems threatening concrete structural development and the stability and safety of structures. However, the nonlinear theory is the key to solving the problem of taking into account the physical and mechanical properties of concrete creep in shell structures. To create such a theory, the original shell is replaced by a continuous equivalent elastic shell. To determine the stress–strain state of the structure, the equations of nonlinear creep and crack growth are derived, and a deformation model of the section is created. The behavior of the structure at all stages of the life cycle is investigated by solving the solving systems of differential equations of equilibrium, motion, and perturbation of the equivalent shell. The values of the ratios of dependence of long-term and short-term critical loads on deformations, forces, cracks, etc., are given. The accuracy of the solution of the developed nonlinear theory is compared with the linear theory of concrete creep as well as experimental data. The results show that, according to the linear theory, for the values for the short term and long term, up to 56% and up to 39% of critical loads are overestimated, respectively. The creep process in practical engineering can be effectively controlled by the results of the proposed theory.

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“…One way to recycle hydrated cement is to mechanically process it by grinding it into smaller particles, breaking down the hydrated conglomerate and revealing the unhydrated portion of the cement [25][26][27]. Unhydrated cement will hydrate as expected, and the hydrated cement particles will act as crystallization centers [28,29].…”

Section: Introductionmentioning

confidence: 99%

Recycling of Cement–Wood Board Production Waste into a Low-Strength Cementitious Binder

2022

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Cement is a widely used building material, with more than 4.4 billion metric tons produced in 2021. Unfortunately, the excessive use of cement raises several environmental issues, one of which is the massive amounts of CO2e produced as a by-product. Using recycled materials in the concrete mix is widely employed to solve this problem. A method for minimizing the use of natural cement by substituting it with secondary cementitious material that consists of wood–cement board manufacturing waste has been studied in this paper. The cement in the waste stream was reactivated by a mechanical treatment method—the use of a planetary mill, allowing it to regain its cementitious properties and be used as a binder. Physical and mineralogical analysis of the binder material was performed using X-ray diffraction (XRD), thermogravimetry/differential thermal analysis (TG/DTA) and Brunauer–Emmett–Teller analysis; granulometry and compressive strength tests were also carried out. The results show that the grinding process did not significantly change the mineralogical composition and the specific surface area; it did, however, affect the compressive strength of the samples prepared by using the reactivated binding material; also, the addition of plasticizer to the mix increased compressive strength by 2.5 times. Samples were cured in high-humidity conditions. The optimal water-to-binder (W/B) ratio was found to be 0.7 because of the wood particles that absorb water in their structure. Compressive strength increased as the grinding time increased.

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Creep and Shrinkage Behaviour of Disintegrated and Non-Disintegrated Cement Mortar

Cited by 4 publications

References 27 publications

Statistical Evaluation of CEB-FIP 2010 Model for Concrete Creep and Shrinkage

Statistical Evaluation of CEB-FIP 2010 Model for Concrete Creep and Shrinkage

Creep of Concrete in Shell Structures: Nonlinear Theory

Recycling of Cement–Wood Board Production Waste into a Low-Strength Cementitious Binder

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