Application of Electron Backscatter Diffraction to evaluate the ASR risk of concrete aggregates

Rößler, Christiane; Möser, B.; Giebson, Colin; Ludwig, Horst‐Michael

doi:10.1016/j.cemconres.2017.02.015

Cited by 14 publications

(13 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…CI is defined as a measure of how reliable the EBSD indexing method is above a set tolerance value (usually 0.1) 37 . To obtain high‐quality EBSD indices, the baseline parameters should be at least six bands to index and a CI greater than 0.1 should be attained, respectively 25 . For further accuracy, we ensured that an image quality (IQ) of

\ge 2500

and a fit of

\le

\mathrm{2^\circ }

were obtained as seen in Figure 3.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Therefore, XRD is insufficient for the comprehensive characterization of a deleterious mineral like pyrrhotite in concrete aggregates. By contrast, electron backscatter diffraction (EBSD) provides high spatial and angular resolutions of

\mathrm{20\,nm}

and

\mathrm{0.5^\circ }

, respectively, and can be automated to obtain reliable statistical representation of the materials 22–26 . Moreover, an EBSD detector can be installed in common scanning electron microscopes and applied in conjunction with the EDS detector as illustrated in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

“…In previous studies, EBSD was applied to study the expansion‐induced cracking caused by alkali silica reactions (ASR) 25,26 . ASR and ISA are currently the two main causes for the expansion of concrete structures 3 .…”

Section: Introductionmentioning

confidence: 99%

“…ASR is predominant in concrete with aggregates containing amorphous silica, while ISA is more prevalent in concrete with aggregates containing iron sulfides like pyrrhotite and pyrite. In a recent study, EBSD was utilized to characterize aggregates that were at risk for ASR by measuring quartz grain boundaries and crystallographic misorientation 25 . It was demonstrated that in a high pH environment like concrete, the dissolution of deformed quartz occurs not only at high angle grain boundaries but also at subgrain boundaries and Dauphiné twin boundaries.…”

Section: Introductionmentioning

confidence: 99%

“…EBSD is one of the few techniques that makes it possible to recognize and quantify easy‐to‐miss features such as Dauphiné twin boundaries. It therefore allows the identification of aggregates that are at risk for ASR which may otherwise be missed by standard tests 25,30 . However, while ASR has been well studied, 2,9,10,25 there is no known application of EBSD to understand the specific role of pyrrhotite in ISA.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Preparation of concrete specimen for internal sulfate attack analysis using electron backscatter diffraction

Uwanyuze

Enright

Zhang

et al. 2022

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

Concrete cores were obtained from houses in eastern Connecticut, USA, that had varying degrees of crumbling foundations and wall cracking. Electron backscatter diffraction (EBSD) was used simultaneously with energy dispersive X‐ray spectroscopy to investigate the degradation of these samples. This combination allowed the precise correlation of elemental composition with mineral crystallography phase mapping. EBSD examination showed the presence of pyrrhotite, pyrite, and marcasite phases in some of the samples, whereas internal sulfate attack (ISA) is triggered by the release of sulfates through the oxidation of such iron sulfides. Secondary expansion products from ISA are associated with foundation cracking, wall bulging, and drastically decreased structural stability. The main contribution of this study is therefore an automated procedure for preparation of concrete samples and analysis of aggregates using EBSD.

show abstract

\ge 2500

and a fit of

\le

\mathrm{2^\circ }

were obtained as seen in Figure 3.…”

Section: Experimental Methodsmentioning

confidence: 99%

\mathrm{20\,nm}

and

\mathrm{0.5^\circ }

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Preparation of concrete specimen for internal sulfate attack analysis using electron backscatter diffraction

Uwanyuze

Enright

Zhang

et al. 2022

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

show abstract

Characterisation of cement‐based materials by 2D and 3D analytical SEM

Rößler,

Kleiner,

Matthes

et al. 2023

ce papers

View full text Add to dashboard Cite

The demands on modern building materials are constantly increasing. Innovative solutions produce a multitude of binders and concretes that often have a very complex, multiscale heterogeneous composition. Multi‐scale imaging of structural characteristics is still a challenge but will provide basic understanding of essential material properties.Over centuries scanning electron microscopy (SEM) has been applied to characterize unhydrated and hydrated cements as well as concretes. Continuous development of microscopes soft‐ and hardware steadily gives new insights into the materials microstructure. Here we give an overview of current characterisation possibilities such as high‐resolution chemical‐crystallographic analysis in the SEM using energy dispersive X‐ray spectroscopy (EDX) in combination with electron backscatter diffraction (EBSD), 3D imaging in the SEM using focused ion beam (FIB) serial sectioning and image reconstruction, cryo‐FIB‐SEM as well as high resolution imaging on argon broad ion beam (BIB) sectioned surfaces.

show abstract

Characterization of the Nano- and Microscale Deterioration Mechanism of the Alkali–Silica Reaction in Concrete Using Neutron and X-ray Scattering Techniques: A Review

Nsiah-Baafi¹,

Tapas²,

Vessalas

et al. 2023

Lecture Notes in Civil Engineering

View full text Add to dashboard Cite

Alkali–silica reaction (ASR) is one of the most recognized chemical reactions that lead to the deterioration and premature failure of concrete. The severity of ASR is largely dependent on the expansive nature of the reaction product (ASR gel). As such, it is important to expound the developed knowledge on the formation, structure, composition, and swelling mechanism of ASR gel, to provide a greater understanding of ASR deterioration and to facilitate the development of more reliable prediction and mitigation methods. We present a summary of existing methods for assessing ASR and the state-of-the-art techniques that use neutron and X-ray scattering methods to characterize the nano- and microstructural properties of concrete and elucidate the potential transport dynamics of reactants that determine the mechanism and extent of ASR.

show abstract

Application of Electron Backscatter Diffraction to evaluate the ASR risk of concrete aggregates

Cited by 14 publications

References 42 publications

Preparation of concrete specimen for internal sulfate attack analysis using electron backscatter diffraction

Preparation of concrete specimen for internal sulfate attack analysis using electron backscatter diffraction

Characterisation of cement‐based materials by 2D and 3D analytical SEM

Characterization of the Nano- and Microscale Deterioration Mechanism of the Alkali–Silica Reaction in Concrete Using Neutron and X-ray Scattering Techniques: A Review

Contact Info

Product

Resources

About