Enhanced Model and Simulation of Hydration Process of Blast Furnace Slag in Blended Cement

Luan, Yunbo; Ishida, Tetsuya; Nawa, Toyoharu; Sagawa, Takahiro

doi:10.3151/jact.10.1

Cited by 48 publications

(16 citation statements)

References 23 publications

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“…However, this degradation mechanism has not fully clarified yet. This lack of knowledge in restraint cracking behavior of BFS concrete is contrary to visible progress in fundamental study in hydration process of BFS cement (e.g., Luan and Ishida 2013;Luan et al 2012).…”

Section: Introductionmentioning

confidence: 65%

Quantitative Evaluation of Crack Resistance Mechanism of Blast Furnace Slag Blended Cement Concrete via Restrained Shrinkage Stress Analysis

Kanda

Momose

Imamoto

et al. 2015

ACT

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Application of blast-furnace slag blended cement is an important option to reduce carbon dioxide emission peculiar to concrete materials in construction, and concrete structures using the blended cement concrete (hereafter denoted as BFS concrete) is in great demand. However, shrinkage cracking resistance of BFS concrete decreases at high temperatures. In this study, mechanisms of the reduction of cracking resistance at high temperatures were investigated aiming at the control of shrinkage cracking of BFS concrete as the final goal. Constitutive material properties necessary for restrained shrinkage stress analysis were derived through experiments including such as restrained cracking test under a temperature of 30, 20 and 10°C, free shrinkage test, and compressive creep test. On the basis of the constitutive material properties obtained with the above tests, applicability of existing restrained shrinkage stress analysis to BSF concrete was examined. Analytical results indicate that the stress analysis was found to reproduce the cracking behavior at an ambient temperature from 10 to 20°C. However, at an ambient temperature of 30°C, the analysis overestimates restrained shrinkage stress, which is considered due to underestimating creep effects. This underestimation may occur due to surface micro-cracks eminently generated on surface.

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Section: Introductionmentioning

confidence: 65%

Quantitative Evaluation of Crack Resistance Mechanism of Blast Furnace Slag Blended Cement Concrete via Restrained Shrinkage Stress Analysis

Kanda

Momose

Imamoto

et al. 2015

ACT

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“…As studied, the hydration products of cement blended with slag are essentially similar to those of plain cement, i.e., calcite silicate hydrate (CSH) and calcium hydroxide (CH) (Richardson 2008;Luan et al 2012). The hydration of slag also goes through three stages: the nucleation period during which product growth is accelerating, the phase boundary controlled stage and the diffusion-controlled stage.…”

Section: Numerical Simulation Of Itz In Blended Cementitious Compositesmentioning

confidence: 91%

Assessment of Structural Feature and Ionic Diffusivity of ITZ in Blended Cementitious Composites

Gao

Schutter

et al. 2016

ACT

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In this paper, we present a study about the assessment of structural feature and ionic diffusivity of interfacial transition zone (ITZ) in blended cementitious composites, which are made of Portland cement, blast furnace slag and limestone filler. In particular, three mortar series are examined with respect to varying replacement levels of supplementary cementitious materials (SCMs), curing age and water-to-binder (w/b) ratio. Based on the techniques of experimental measurement and numerical simulation, i.e., the backscattered electron (BSE) image analysis and the HYMOSTRUC model, the structural features of ITZ in designed mortars are elaborated in a quantitative manner. Thereafter, a lattice Boltzmann method based computer modeling of ionic diffusion in the ITZ is performed to predict the ionic diffusivity. Results indicate that the ITZ differs much from bulk paste, which is of significant importance in blended cementitious composites. The structural feature and the ionic diffusivity of ITZ are prominently affected by various casting factors, such as replacement levels of SCMs, curing age and w/b ratio.

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“…The manufacture and curing of the test specimen that the experiment was conducted in the examination room of the plant maintained environment of 22±2 ℃ [9].…”

Section: A Compressive Strength Test Resultsmentioning

confidence: 99%

Study on the Durability of Concrete Lining by Using Early-Strength Agent

Yokoyama¹,

Uno²,

Hashimoto³

et al. 2017

IJET

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Abstract-The purpose of this study is to verify the effect of the new concept of admixture (early strength agent). Its admixture was developed to achieve rapid construction. Original use of the admixture is to improve the productivity of a concrete secondary product. However, since lining concrete to carry out the demolding a relatively small strength, the authors were judged to be able to exploit the characteristics of the admixture. Then, pursuing the possibility of realizing the shortening of the construction period, is applied to the tunnel construction by NATM, it was measured such as compression strength and air permeability coefficient as the physical properties of the hardened concrete. In this paper, we describe the results of a study regarding the possibility of improving the durability in addition to the improvement of productivity. As the result shows, it is possible for the concrete made with accelerator to get greater durability than the normal combination concrete after it was demold because concrete mixed accelerator showed large enough compressive strength.[1].

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Enhanced Model and Simulation of Hydration Process of Blast Furnace Slag in Blended Cement

Cited by 48 publications

References 23 publications

Quantitative Evaluation of Crack Resistance Mechanism of Blast Furnace Slag Blended Cement Concrete via Restrained Shrinkage Stress Analysis

Quantitative Evaluation of Crack Resistance Mechanism of Blast Furnace Slag Blended Cement Concrete via Restrained Shrinkage Stress Analysis

Assessment of Structural Feature and Ionic Diffusivity of ITZ in Blended Cementitious Composites

Study on the Durability of Concrete Lining by Using Early-Strength Agent

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