Coupling statistical indentation and microscopy to evaluate micromechanical properties of materials: Application to viscoelastic behavior of irradiated mortars

Hilloulin, Benoît; Robira, Maxime; Loukili, Ahmed

doi:10.1016/j.cemconcomp.2018.09.008

Cited by 28 publications

(28 citation statements)

References 41 publications

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“…Several studies have already proven the detrimental effect of gamma radiation on OPC-based matrices, due to changes in compressive strength, changes in average pore diameter, radiation induced carbonation and the formation of microcracks [13]- [20]. However, only a few studies examining the effect of gamma radiation on IPs are published [5], [21], [22].…”

Section: Introductionmentioning

confidence: 99%

“…Si-O are thought to be sensitive for gamma irradiation due to the electronic excitations cause when a gamma ray interacts with matter [25]. Hilloulin et al [20] mentioned an increase of the cement paste creep modulus and harness and decrease of the creep characteristic time for a gamma irradiation up to 257 kGy at 8.5 Gy/h. The samples used in the previously mentioned studies had already a certain state of hardening prior to irradiation which is not the case for all barrier systems used in nuclear waste encapsulation.…”

Section: Introductionmentioning

confidence: 99%

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The effect of gamma radiation on the mechanical and microstructural properties of Fe-rich inorganic polymers

Mast

Gerardy

Pontikes

et al. 2019

Journal of Nuclear Materials

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Inorganic Polymers (IPs) are interesting alternative binder materials to Ordinary Portland Cement (OPC). They could be potentially used in applications such as nuclear safety structures and radioactive waste management since they are highly chemically and thermally resistant. However, their chemical and mechanical stability still has to be proven when irradiated at the very early age.This study investigated the effect of gamma irradiation on the mechanical and microstructural properties of IPs cured for 1 hour, 24 hours or 28 days. For that purpose, IPs were irradiated using different dose rates (1.6 Gy/h, 7.1 Gy/h, 152 Gy/h and 2 kGy/h) until different absorbed doses with a maximum of 624 kGy. The effects were evaluated by means of compressive strength tests, microstructural analysis by image analysis, porosity analysis (water absorption and MIP), thermogravimetric analysis (TGA) and infrared spectrometry. For each irradiation test, non-irradiated samples were kept as a reference at the same environmental conditions as the irradiated samples. The results were compared with similar studies on OPC-based samples.At low doses (< 5 kGy) no statistically significant change has been found. Above 5 kGy however, a significant increase in compressive strength was found for all the samples tested. An increase up to 22 % in compressive strength was observed for the samples irradiated at 2 kGy/h. Gamma radiation induced carbonation, Fe 3+ reduction and polymerization could explain the strength increase but need further investigation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The effect of gamma radiation on the mechanical and microstructural properties of Fe-rich inorganic polymers

Mast

Gerardy

Pontikes

et al. 2019

Journal of Nuclear Materials

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“…On the other hand, the measurement of in situ creep under gamma irradiation was reported to decrease the creep response of irradiated cement with respect to its control specimen . Creep was also found to be lower for gamma‐irradiated mortars at a dose of 257 kGy than that of their control samples …”

Section: Introductionmentioning

confidence: 92%

Examination of gamma‐irradiated calcium silicate hydrates. Part I: Chemical‐structural properties

et al. 2019

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The chemical‐structural properties of synthetic calcium silicate hydrate (C‐S‐H) with C/S (Ca/Si) ratios of 0.75, 1 and 1.33 were studied after gamma irradiation‐absorbed doses ranging from 0.145 to 0.784 MGy and compared with those of control specimens. The results showed that the total water content given by thermogravimetric analysis and the dimension of the basal spacing given by x‐ray diffraction were comparable for control and irradiated samples, which indicate that the interlayer water content did not change. The morphology, C/S ratios, and silicate mean chain length were also found to be unaltered by the absorbed gamma doses.

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“…Primarily, this has been conducted using the statistical property analysis technique proposed by Ulm et al [4,[17][18][19]. However, some additional techniques have also recently been applied: K-means cluster analysis [16] and machine learning [20,21]. Both of 2 Invited Paper these techniques also allow the spatial positions of the indents to be considered as an additional dimension during the analysis allowing visualizing of the clusters within the maps.…”

Section: Introductionmentioning

confidence: 99%

Influence of indentation size and spacing on statistical phase analysis via high-speed nanoindentation mapping of metal alloys

Besharatloo

Wheeler

2021

Journal of Materials Research

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The development of high-speed nanoindentation has enabled the acquisition of mechanical property maps over square millimeters of area with micron-scale resolution in reasonable amounts of time. This provides rich datasets which contain morphological and statistical data on the variation of mechanical properties in a microstructure. However, the influences of the indentation size and the deconvolution method employed on the extracted phase properties remain unclear. In this work, a range of depth/spacing increments was explored on two different materials systems, an Al-Cu eutectic alloy and a duplex stainless steel, representing an ‘easy’ and a ‘hard’ case for statistical deconvolution, respectively. A total of ~ 500,000 indentations were performed. A variety of statistical analyses were then employed and compared: the 1D analysis of Ulm et al. using 2 and 3 phases, a 2D rotated Gaussian fit, K-means clustering, and a visual comparison to 2D histograms. This revealed several different sensitivities of the deconvolution methods to various types of error in phase identification. Graphic abstract

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Coupling statistical indentation and microscopy to evaluate micromechanical properties of materials: Application to viscoelastic behavior of irradiated mortars

Cited by 28 publications

References 41 publications

The effect of gamma radiation on the mechanical and microstructural properties of Fe-rich inorganic polymers

The effect of gamma radiation on the mechanical and microstructural properties of Fe-rich inorganic polymers

Examination of gamma‐irradiated calcium silicate hydrates. Part I: Chemical‐structural properties

Influence of indentation size and spacing on statistical phase analysis via high-speed nanoindentation mapping of metal alloys

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