Influence of aggregate bridging on the fatigue behavior of concrete

Simon, Keerthy M.; Kishen, J.M. Chandra

doi:10.1016/j.ijfatigue.2016.05.009

Cited by 31 publications

(9 citation statements)

References 17 publications

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“…It should be noted that the fatigue response of material is very sensitive to the flaws and defects [44,45,46]. Consequently, when compared with the mortar or concrete at the larger scale, the cement paste at the micro scale exhibits higher fatigue resistance due to less initial defects, such as the porous interfacial transition zone (ITZ) [47].…”

Section: Resultsmentioning

confidence: 99%

Static and Fatigue Tests on Cementitious Cantilever Beams Using Nanoindenter

et al. 2018

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Cement paste is the main binding component in concrete and thus its fundamental properties are of great significance for understanding the fracture behaviour as well as the ageing process of concrete. One major aim of this paper is to characterize the micromechanical properties of cement paste with the aid of a nanoindenter. Besides, this paper also presents a preliminary study on the fatigue behaviour of cement paste at the micrometer level. Miniaturized cantilever beams made of cement paste with different water/cement ratios were statically and cyclically loaded. The micromechanical properties of cement paste were determined based on the measured load-displacement curves. The evolution of fatigue damage was evaluated in terms of the residual displacement, strength, and elastic modulus. The results show that the developed test procedure in this work is able to produce reliable micromechanical properties of cement paste. In addition, little damage was observed in the cantilever beams under the applied stress level of 50% to 70% for 1000 loading cycles. This work may shed some light on studying the fatigue behaviour of concrete in a multiscale manner.

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Section: Resultsmentioning

confidence: 99%

Static and Fatigue Tests on Cementitious Cantilever Beams Using Nanoindenter

et al. 2018

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“…82 This can be attributed to the addition of FA decreasing the density of impervious pore space, which eventually enhances the concrete compressive strength. 83 An increase in compressive strength can be also because of the microstructure densification at the interfacial transition zone (ITZ). A similar study was performed by the authors and revealed that 22 for 16% replacement of sand with a WG of size 3.60 mm-200 microns.…”

Section: Compressive Strengthmentioning

confidence: 99%

“…Up to a certain amount of glass as a substitute in concrete usage, the WG filler effect takes place. 83 Any surplus addition of WG will lead to void formation. 36 T Now, in the M4 mix (FA15-WM-16-CF-2), the nature of pore filling controls prompts to M4 mix to be the optimum mixture.…”

Section: Compressive Strengthmentioning

confidence: 99%

Evaluating the influence of fly ash and waste glass on the characteristics of coconut fibers reinforced concrete

Aslam

Zaid

Althoey

et al. 2022

Structural Concrete

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The disposal of waste from coal plants and waste glass (WG) is causing significant environmental problems all around the planet. Currently, the amount of discarding of these wastes is increased. One possible option is to utilize fly ash (FA) from coal plants as a partial substitute for the cement and EG as a fractional substitute for sand in concrete, respectively. Besides, fibers can improve the strength and durability of concrete; explicitly speaking, using coconut fibers (CFs) is in trend due to their highest toughness among natural fibers making it suitable material as fiber reinforcement in concrete. This research studies the concrete behavior with 15% FA as a partial substitute of cement with 2% CFs and waste beverage glass as sand at various replacement levels (14%, 15%, 16%, 17%, 18%, 19%, and 20%). Mechanical and durability characteristics of concrete were assessed, such as compression strength, water absorption, flexural strength, density, workability, and water absorption. The current study results show that adding FA, CFs, and WG improved microstructure quality at 16% replacement of sand. The study showed that the M4 mix has enhanced the properties of concrete samples as compressive and flexural strength was improved to 47.2 and 6.2 MPa and improved apparent density by 20%. Adding more WGP than the optimal proportion (16%) led to detrimental effects on void ratio, permeability, and water absorption. Therefore, 16% of sand with WG and 15% of FA with cement can be substituted with 2% CFs to develop sustainable concrete.

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“…Bridging can be modeled implicitly in the continuum damage approach employed in this article. Such a phenomenon may be caused by aggregates as well (Simon and Chandra Kishen, 2016). Parameters such as fracture energy and nonlocal interaction are responsible to control these effects.…”

Section: Closing Remarksmentioning

confidence: 99%

Spatially random modulus and tensile strength: Contribution to variability of strain, damage, and fracture in concrete

Castillo

Nguyen

Niiranen

2021

International Journal of Damage Mechanics

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This paper explores the computational modeling of nonlocal strain, damage, and fracture in concrete, considering the isolated contribution of two random, spatially variable properties related to the fracture process: Young’s modulus (E) and tensile strength (ft). Applying a continuum damage model, heterogeneous specimens of concrete with random and spatially varying E or ft were found to produce substantial differences when contrasted with traditional homogeneous (non-random) specimens. These differences include variable and uncertain strain and damage, wandering of the failure paths, and differing (sometimes lower) peak forces, i.e. increased probabilities of failure in the heterogeneous specimens. It is found that ft variability contributes more (from 1.7 to up to 4 times more, depending on the parameter) to the overall performance variability of the concrete than E variability, which has a comparatively lower contribution. Performance is evaluated using (1) force-displacement response, (2) individual, average, and standard deviation maps of non-local strain and damage, (3) fracture paths and strain and damage values along the fractures. The modeling methodology is illustrated for two specimen geometries: a square plate with a circular hole, and an L-shaped plate. The computational results correlate well with reported experimental data of fracture in concrete specimens.

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Influence of aggregate bridging on the fatigue behavior of concrete

Cited by 31 publications

References 17 publications

Static and Fatigue Tests on Cementitious Cantilever Beams Using Nanoindenter

Static and Fatigue Tests on Cementitious Cantilever Beams Using Nanoindenter

Evaluating the influence of fly ash and waste glass on the characteristics of coconut fibers reinforced concrete

Spatially random modulus and tensile strength: Contribution to variability of strain, damage, and fracture in concrete

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