Steven Millar

Steven Millar
CORR-LESS Isecke & Eichler Consulting GmbH & Co. KG

Doctor of Engineering

About

19
Publications
1,933
Reads
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169
Citations
Citations since 2016
11 Research Items
167 Citations
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2016201720182019202020212022010203040
2016201720182019202020212022010203040
2016201720182019202020212022010203040
Additional affiliations
January 2014 - March 2020
CORR-LESS Isecke & Eichler Consulting GmbH & Co. KG
Position
  • Project Manager
October 2013 - December 2019
Bundesanstalt für Materialforschung und -prüfung
Position
  • Researcher
Description
  • Chemical analysis of building materials using LIBS
Education
November 2016 - February 2020
Technische Universität Berlin
Field of study
  • Civil Engineering
October 2011 - October 2013
Hochschule für Technik und Wirtschaft Berlin
Field of study
  • Civil Engineering
October 2007 - April 2011
Hochschule für Technik und Wirtschaft Berlin
Field of study
  • Civil Engineering

Publications

Publications (19)
Article
The composition of concrete determines its resistance to various degradation mechanisms such as ingress of ions, carbonation or reinforcement corrosion. Knowledge of the composition of the hardened concrete is therefore helpful to assess the remaining service life of an existing structure or evaluate the damage observed during inspections. For exam...
Thesis
Die chemische Analytik von Beton gehört zu den grundlegenden Untersuchungen bei der Zustandserfassung von Stahl- und Spannbetonbauwerken. Insbesondere die Quantifizierung des Chloridgehalts in Abhängigkeit der Bauteiltiefe stellt, neben weiteren Einflussparametern, einen wichtigen Indikator für die Korrosionsgefährdung des eingebetteten Stahls dar....
Conference Paper
Die chemische Analyse von Beton gehört bei der Ermittlung des Ist-Zustandes von Stahl- und Spannbetonbauwerken zu den grundlegenden Untersuchungen bei der Zustandserfassung. Der tiefenabhängige Chloridgehalt sowie der Karbonatisierungsfortschritt müssen bei der Bewertung des Ist-Zustandes, beim Instandsetzungsbedarf und ggf. bei der Planung eines e...
Article
The presented work discusses the accuracy of Laser Induced Breakdown Spectroscopy (LIBS) in determining the total chloride content in cement pastes. LIBS as an emission spectroscopy method is used to detect simultaneously several elements present in cement-based materials. By scanning surfaces the variability in the spatial distribution of elements...
Article
de In den letzten Jahren sind im deutschen Bundesautobahnnetz vermehrt AKR‐Schäden an Betonfahrbahndecken aufgetreten. Ursächlich hierfür ist die Verwendung alkaliempfindlicher Gesteinskörnung. Dies führt bei gleichzeitiger Anwesenheit von Wasser infolge der Exposition der Fahrbahndecke und des alkalischen Milieus durch den Einsatz alkalireicher Po...
Article
The determination of chloride is still one of the main tasks for the evaluation of reinforced concrete structures. The corrosion of the reinforcement induced by the penetrating chlorides is the dominant damage process affecting the lifetime of concrete structures. In the recent years different research groups demonstrated that LIBS can be a fast an...
Presentation
Die Instandsetzung von Stahlbetonbauwerken, die durch chloridinduzierte Korrosion gefährdet oder bereits geschädigt sind, hat in den letzten Jahrzehnten weltweit an Bedeutung gewonnen. Der kathodische Korrosionsschutz (KKS) bildet in diesem Fall eine zuverlässige und oftmals kostengünstige Methode zur Instandsetzung. Das grundsätzliche Ziel des ka...
Article
For the damage assessment of reinforced concrete structures the quantified ingress profiles of harmful species like chlorides, sulfates and alkali need to be determined. In order to provide on-site analysis of concrete a fast and reliable method is necessary. Low transition probabilities as well as the high ionization energies for chlorine and sulf...
Article
Laser-induced Breakdown Spectroscopy (LIBS) is capable of providing spatially resolved element maps in regard to the chemical composition of the sample. The evaluation of heterogeneous materials is often a challenging task, especially in the case of phase boundaries. In order to determine information about a certain phase of a material, the need fo...
Conference Paper
Full-text available
The Laser Induced Breakdown Spectroscopy (LIBS) for the investigation of element distributions and ion transportation in building materials (especially for concrete) is established at BAM. The method is a combination of laser ablation and optical emission spectroscopy. With its translation stage (lab-system) or scanner system (mobile system) the el...
Conference Paper
Laser-induced breakdown spectroscopy (LIBS) is a combination of plasma generation on the sample surface by a high power laser pulse and optical emission spectroscopy (OES). It is a direct measurement method without an extensive sample preparation. Concrete is a multi phase system. With LIBS it is possible to distinguish the different phases and bas...
Article
Die Laser induzierte Breakdown Spektroskopie (LIBS) bietet für die Analyse heterogener, mineralischer Baustoffe, wie z. B. Beton, deutliche Vorteile gegenüber konventionellen Methoden. Sie ermöglicht neben der Quantifizierung von Elementgehalten und ‐verteilungen im Baustoff auch die Differenzierung von Elementkonzentrationen innerhalb einzelner Ph...
Article
Full-text available
Cracks are always present in reinforced concrete structures. In the presented research, influence of mechanical cracks on chloride ingress is studied. A compact reinforced concrete specimen was designed, mimicking the cracking behaviour of beam elements. Cracks of different widths were induced by means of mechanical loading. These cracked specimens...
Conference Paper
The laser induced breakdown spectroscopy (LIBS) is a combination of laser ablation and optical emission spectroscopy. Due to the possibility of direct measurements on the sample surface and a minimum of required sample preparation investigations of building materials can be conducted quite fast. In combination with a scanning technique (translation...
Article
Full-text available
Laser Induced Breakdown Spectroscopy (LIBS) is a combination of laser ablation, plasma formation and optical emission spectroscopy. The possibility of direct measurements on the sample surface, the minimum of necessary sample preparation and the automated setup allows for fast investigations of building materials. In combination with a scanning tec...
Conference Paper
Full-text available
Cracks are always present in reinforced concrete structures. It is a goal of the current research to study the influence of mechanical cracks on chloride ingress. A compact reinforced concrete specimen was designed, mimicking the cracking behaviour of beam elements. Cracks of different widths were induced by means of mechanical loading. These crack...

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