Modeling of autogenous volume deformation process of RCC mixed with MgO based on concrete expansion experiment

Nguyen, Van Tinh; Tong, Fu Guo; Nguyen, Van Nghia

doi:10.1016/j.conbuildmat.2019.03.226

Cited by 17 publications

(8 citation statements)

References 23 publications

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“…Increasing the curing temperature can promote the expansive behavior of MgO. As shown in Figure 7 , as the curing temperature rises, the autogenous expansion of the concrete with MgO increases, the expansive rate accelerates, and the stable age of deformation is reached earlier [ 54 , 56 , 59 , 60 , 61 , 62 , 63 ], which indicates the promoting effect of raising the temperature on the hydration of MgO. For high-reactivity MgO, raising the temperature can promote the expansive rate of concrete, but it has no significant effect on the ultimate expansion at later ages (14-30 d).…”

Section: Deformation Of Cementitious Materials With the Addition Of Mgomentioning

confidence: 99%

“…Both k 1 and k 2 are determined through regression analysis of the experimental results. As shown in Figure 10 , Van Nguyen et al [ 62 ] used a hyperbolic model by considering the combined effects of the MgO content, curing temperature, and age to predict the autogenous deformation of concrete with MgO addition. The predicted deformation results agreed with the measured ones, and the deformation of concrete at different temperatures and MgO contents could be predicted.…”

Section: Estimation Of Deformationmentioning

confidence: 99%

“… The influence of temperature on the autogenous deformation of concrete mixed with 4% MgO (reprinted with permission from Ref. [ 62 ], 2019, Elsevier). …”

Section: Figurementioning

confidence: 99%

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Deformation and Cracking Resistance of MgO-Incorporated Cementitious Material: A Review

Pan

Li³

et al. 2023

Materials

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In China, MgO-based expansive agent (MEA) has been used for concrete shrinkage compensation and cracking control for over 40 years. The expansive behavior of MEA in cementitious materials could be manipulated to some extent by adjusting the calcination process of MEA and influenced by the restraint condition of the matrix. It is key to investigate the factors related to deformation and cracking resistance so that the desired performance of MEA in certain concrete structures could be achieved. This paper reviews the influence of key parameters such as hydration reactivity, dosage, and calcination conditions of MEA, the water-to-binder ratio, supplementary cementitious material, aggregates, and curing conditions on the deformation and cracking resistivity of cement paste, mortar, and concrete with an MEA addition. The numerical simulation methods and deformation prediction models are then summarized and analyzed for more reasonable estimations.

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Section: Deformation Of Cementitious Materials With the Addition Of Mgomentioning

confidence: 99%

Section: Estimation Of Deformationmentioning

confidence: 99%

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Deformation and Cracking Resistance of MgO-Incorporated Cementitious Material: A Review

Pan

Li³

et al. 2023

Materials

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“…So far, MgO-admixed concrete has been used in more than 50 small-and medium-sized hydraulic and hydroelectric engineering projects in China to simplify the temperature control measures for dam concrete, accelerate the construction schedule, and save the project investment (Li and Yuan, 2003;Chen et al, 2011a;Yuan et al, 2012;Mo et al, 2014;Zhao 2014;Chen et al, 2017b). However, only a few experimental studies about MgO-admixed mortar and concrete in the laboratory have been done in other countries (Mehta and Pirtz, 1980;Chatterji 1995;Ali and Mullick, 1998;Vandeperre et al, 2008;Seul-Woo et al, 2014;Sherir et al, 2016;Sherir et al, 2017;Sherir et al, 2017;Gonçalves et al, 2019;Khalil and Celik, 2019;Nguyen et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Influence of Specimen Size on Autogenous Volume Deformation of Long-Aged MgO-Admixed Concrete

et al. 2021

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The transformation law of autogenous volume deformation of MgO-admixed concrete with specimen size was revealed through continuous observation on standard-size (Φ200 mm × 500 mm), medium-size (Φ250 mm × 500 mm), and large-size specimens (Φ250 mm × 600 mm) over 6 years. Besides, the pore parameters of concrete core samples obtained from autogenous volume deformation specimens in the 1st, 3rd, and 6th years of age were investigated. The results show that the autogenous volume deformation of MgO-admixed concrete increases with the increase in the MgO content or age. The expansion rate of the concrete specimen decreases after the age of 360 days, and the autogenous volume expansion deformation of the specimen tends to be stable after about 2 years. When the size of the specimen changes, the autogenous volume deformation of MgO-admixed concrete decreases with the increase of specimen size. During the age of 2–6 years, the expansion of medium- and large-size specimens is reduced by 6–10 and 15–20%, respectively, compared with the standard-size specimens under the same MgO content. With the condition of an appropriate MgO content, regardless of the size of the specimen, the pore structure of the concrete becomes better and better with the growth of age, the concrete becomes denser and denser, and the expansion caused by MgO hydration will not cause damage to concrete structures.

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“…erefore, MgO concrete has been increasingly used in small and mediumsized water conservancy and hydropower engineering in China, up to now more than 50, and its application has been extended from normal concrete dam to roller compacted concrete (RCC) dam [11][12][13][14][15][16][17][18]. However, in other countries, only a small amount of laboratory studies have been done, and there are no reports about their application in practical engineering [19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Research on Balanced Content of Magnesium Oxide in Roller Compacted Concrete

Chang-li

Chen

Zhao

et al. 2020

Advances in Materials Science and Engineering

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In order to accelerate the application of magnesium oxide (MgO) expanding admixture in roller compacted concrete (RCC), aiming at common three-grading RCC used in water conservancy and hydropower engineering, the autoclave expansion of mortar specimens and the compressive strength of the autoclaved mortar specimens were studied by means of autoclave test and compressive strength test. Results showed that the balanced MgO content in RCC, which cannot be determined by the MgO content corresponding to 0.5% autoclave expansion rate of mortar specimens or the inflection point of the curve of autoclave expansion changing with MgO content like normal concrete, should be determined by the MgO content corresponding to the inflection point of the curve that compressive strength of autoclaved mortar specimens changes with MgO content to ensure long-term safe operation of RCC dams.

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Modeling of autogenous volume deformation process of RCC mixed with MgO based on concrete expansion experiment

Cited by 17 publications

References 23 publications

Deformation and Cracking Resistance of MgO-Incorporated Cementitious Material: A Review

Deformation and Cracking Resistance of MgO-Incorporated Cementitious Material: A Review

Influence of Specimen Size on Autogenous Volume Deformation of Long-Aged MgO-Admixed Concrete

Research on Balanced Content of Magnesium Oxide in Roller Compacted Concrete

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