An experimental study on mechanical, shrinkage and creep properties of early-age concrete affected by clay content on coarse aggregate

Zhou, Yuqi; Du, He; Liu, Yuhang; Liu, Jiankun; Liang, Siming

doi:10.1016/j.cscm.2022.e01135

Cited by 5 publications

(3 citation statements)

References 29 publications

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“…In recent years, many researchers have begun to systematically study the concrete creep and shrinkage phenomena. A large number of experimental results have been statistically analyzed combined with numerical methods and computer optimization, and several mathematical prediction models have been proposed and improved [ 8 ]. Some researchers have applied the existing creep and shrinkage experimental technology to study the mechanisms, parameter influence law, and other aspects of concrete materials used in a specific structure or environment and established a corresponding creep and shrinkage calculation model.…”

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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“…Mud content in sand adversely affects the strength of concrete [29]. Under normal conditions, the concrete slump decreases with the increase in mud content of aggregates [17,28,30,31], which will cause difficulties in the field construction of concrete. In addition, the variation in the properties of mortar and concrete depends on the chemical composition and mineral composition of the mud in the sand [16,32].…”

Section: Introductionmentioning

confidence: 99%

“…The sand-cement mixture with mud cannot be considered a simple mixture but a system in which the mud is combined with the hydrated cement through a secondary reaction. The exchange in cations and flocculation effects occur and the mud is still in a stable state when the mixture is in a freshly mixed state [31][32][33][34]. During the hardening of the cement mixture, the cement undergoes a hydration reaction to produce calcium silicate hydrate, calcium hydroxide, and hydrated aluminate, and the soluble alkali released during the hydration of calcium hydroxide and cement makes the pore solution strongly alkaline, triggering the erosion of the mud, leading to the decomposition of amorphous alumina and silica, which then combine with the calcium ions produced by the hydration reaction of the cement to produce secondary cementitious materials.…”

Section: Introductionmentioning

confidence: 99%

Effects of Mud Content on the Setting Time and Mechanical Properties of Alkali-Activated Slag Mortar

Chen²,

Jia

et al. 2023

Materials

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High mud content in the sand has a negative impact on cement mortar but there is little research on Alkali-activated slag (AAS) mortar. In order to explore the impacts of mud content in the sand on the performance of AAS mortar, this paper used sand that contains silt, clay, and a mixture of silt and clay; tested the setting time of AAS with different mud contents of 0%, 2%, 4%, 6%, 8%, and 10%; and measured the unconfined compressive strength and beam flexural strength of 3 d, 7 d, and 28 d AAS mortar specimens. The microstructure of AAS mortar with different kinds of mud was observed by scanning electron microscope (SEM), the elemental composition of the hydration product was tested by energy dispersive spectroscopy (EDS), and the AAS interaction mechanism with different kinds of mud was analyzed. The main conclusions are: the higher the mud content in the sand, the shorter the initial setting time and the longer the final setting time of AAS, mainly because the mud in the sand affects the hydration process; mud content above 4% causes a rapid decrease in the compressive and flexural strengths of AAS mortar, mainly because the mud affects the hydration process and hinders the bonding of the hydration product with the sand. When there is no mud in the sand, the main hydration product of AAS is dense calcium-alumina-silicate-hydrate (C-A-S-H) gel. When the sand contains silt, the hydration product of AAS is loose C-A-S-H gel. When the sand contains clay, the hydration products of AAS contain C-A-S-H gel and a small amount of sodium-aluminum-silicate-hydrate (N-A-S-H), and needle-like crystals. Loose gel and crystals have a negative effect on the AAS mortar strength.

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Self-healing concrete: A scientometric analysis-based review of the research development and scientific mapping

Amin

Khan

et al. 2022

Case Studies in Construction Materials

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An experimental study on mechanical, shrinkage and creep properties of early-age concrete affected by clay content on coarse aggregate

Cited by 5 publications

References 29 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

Effects of Mud Content on the Setting Time and Mechanical Properties of Alkali-Activated Slag Mortar

Self-healing concrete: A scientometric analysis-based review of the research development and scientific mapping

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