Mechanism for reduction in compressive properties of cementitious materials in relation to internal crack patterns due to ASR and DEF expansion

Miura, Taito; Sato, Katsuki; Fujishima, Misato; Nakamura, Hikaru; Kawabata, Yuichiro

doi:10.1016/j.cemconcomp.2022.104441

Cited by 12 publications

(6 citation statements)

References 42 publications

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“…There appears to be a minimum strength of the concrete after damage, and the value of f cc /f cm is approximately 0.3. A similar value was con rmed experimentally for concrete containing arti cial defects 41 and damage by the alkali-silica reaction (Fig. 5 in 42 ) and the radiation-induced volume expansion of concrete (Fig.…”

Section: Discussionsupporting

confidence: 81%

“…In particular, the dependence on aggregate size may be partly attributed to the effect of a thick water-lled ITZ 26 caused by bleed water 40 . The ITZ and gaps on the underside of the aggregate can be interpreted as the reduced apparent Young's modulus of a coarse aggregate (E' ca ), which rapidly reduces strength in the region of E' ca /E cm ≤ 1.0 41 . However, in the general range of a natural aggregate (E' ca /E cm > 1.0), the impact of the ITZ on f cc /f cm is limited and only slightly reduces the f cc /f cm (see Figure S5), which is consistent with the trends reported in previous studies 19 .…”

Section: Discussionmentioning

confidence: 99%

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Critical influence of aggregate types on the compressive strength of concrete

Maruyama,

Sugimoto

2024

Preprint

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Understanding the role of aggregates in the compressive strength of brittle composites is crucial for optimizing construction material usage. In this study, we employed the rigid-body-spring-network model to determine the compressive strengths of both coarse aggregate and mortar in concrete. Through uniaxial compression loading tests on concrete, considering Young’s modulus and compressive strength of the coarse aggregate as variables, we elucidated the mechanism by which the coarse aggregate’s physical properties influence concrete's compressive strength, illustrated using a straightforward diagram. When the coarse aggregate’s Young's modulus is lower than that of the mortar, the stress transfer path within the mortar bends and cracks more rapidly, significantly lowering strength. Conversely, if the coarse aggregate’s Young’s modulus exceeds that of the mortar, stress becomes concentrated in the aggregate. Considering these aspects, the compressive strength of concrete can be optimized by changing the properties of the mortar according to the properties of the aggregates.

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Section: Discussionsupporting

confidence: 81%

Section: Discussionmentioning

confidence: 99%

Critical influence of aggregate types on the compressive strength of concrete

Maruyama,

Sugimoto

2024

Preprint

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“…Larger strains formed on the axial sides of the coarse aggregates. In addition, the tensile principal strains were generated at lateral sides of the aggregate interface, as well as in the mortar with the expansion of 1.7% at 114 and 217 d. These strain distribution results were consistent with the previous studies (Joshi et al 2022;Miura et al 2022).…”

Section: Visualization Of Change In Expansion Cracks During Loading U...supporting

confidence: 91%

“…DIC processing was performed using the GOM Correlate software supported by GOM. The accuracy of the strain distribution obtained via DIC in this experiment was confirmed in a previous study Miura et al (2022). The other loading conditions were the same as those for the compressive loading without DIC.…”

Section: Digital Image Correlation (Dic)supporting

confidence: 83%

“…Consequently, the expansion cracks closed in the loading direction and widened in the lateral direction, even at a low stress level. Furthermore, Miura et al (2022) investigated the reduction mechanism of compressive properties due to debonding cracks at the interface of aggregates using model concrete reproducing DEF expansion. They indicated that when debonding cracks were generated, the elastic modulus decreased because the aggregates could not bear compressive stress.…”

Section: Introductionmentioning

confidence: 99%

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Stress-bearing Mechanism of Concrete Damaged by Delayed Ettringite Formation under Compressive Stress with Various Loading Patterns

Fujishima

Miura

Kawabata

2023

ACT

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The involvement of expansion cracks in reducing compressive properties was experimentally evaluated. Concrete specimens deteriorated by delayed ettringite formation were subjected to three loading patterns (monotonic, stepwise cyclic and sustained loadings) and digital image correlation was performed to observe the behavior of expansion cracks during compressive loading. As a result, while significantly large plastic deformation was generated in the pre-peak, the reduction in compressive properties was hardly influenced by the loading patterns. The elastic strain, obtained from the loading hysteresis, increased linearly until a maximum load was reached. Consequently, two possible stress-bearing mechanism of concrete damaged by delayed ettringite formation under compressive stress was proposed to explain the development of elastic and plastic strains and the reduction in the compressive property.

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Experimental Study on Compressive Behaviors of Concrete Exposed to Alkali-Silica Reaction Under Multidirectional Restraints

Takahashi,

Li,

et al. 2024

RILEM Bookseries

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Mechanism for reduction in compressive properties of cementitious materials in relation to internal crack patterns due to ASR and DEF expansion

Cited by 12 publications

References 42 publications

Critical influence of aggregate types on the compressive strength of concrete

Critical influence of aggregate types on the compressive strength of concrete

Stress-bearing Mechanism of Concrete Damaged by Delayed Ettringite Formation under Compressive Stress with Various Loading Patterns

Experimental Study on Compressive Behaviors of Concrete Exposed to Alkali-Silica Reaction Under Multidirectional Restraints

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