Chloride ingress in cracked concrete: a laser induced breakdown spectroscopy (LIBS) study

Šavija, Branko; Schlangen, Erik; Farias, J. Pacheco; Millar, Steven; Eichler, Thorsten; Wilsch, Gerd

doi:10.3151/jact.12.425

Cited by 37 publications

(19 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For each mixture, a specimen of 40 Â 40 Â 160 mm 3 was cast in styrofoam molds, then wrapped in bitumen/ aluminium foil and stored in laboratory conditions for more than 6 months. In addition, a thermocouple was cast inside each of the specimens in order to monitor temperature.…”

Section: Functional Testingmentioning

confidence: 99%

See 1 more Smart Citation

Development of ductile cementitious composites incorporating microencapsulated phase change materials

Šavija

Luković

Kotteman

et al. 2017

Int J Adv Eng Sci Appl Math

Self Cite

View full text Add to dashboard Cite

In the past two decades, much research has been devoted to overcoming the inherent brittleness of cementitious materials. To that end, several solutions have been proposed, mainly utilizing fibres. One of the most promising classes of materials is strain hardening cementitious composite (SHCC). It utilizes PVA fibres, and it is relatively costly compared to regular concrete, so it is commonly used only in surface layers. In this paper, a multi-functional ductile cementitious composite based on SHCC has been developed. It uses microencapsulated phase change materials (PCMs), capable of reducing temperature fluctuations in the material due to their high heat of fusion. It is shown that, although addition of microencapsulated PCMs are detrimental to compressive strength, they have very little effect on the flexural strength and deflection capacity. In the future work, mixtures with higher PCM contents will be developed in order to exploit their heat storage capability better. This material has potential to reduce temperature effects on concrete surfaces, while at the same time being extremely ductile.

show abstract

Section: Functional Testingmentioning

confidence: 99%

“…However, they are also prone to cracking [1]. Large cracks provide easy pathways for ingress of deleterious species such as water [2] and chloride [3]. This could lead to fast initiation of reinforcement corrosion [4] and end of service life [5].…”

Section: Introductionmentioning

confidence: 99%

Development of ductile cementitious composites incorporating microencapsulated phase change materials

Šavija

Luković

Kotteman

et al. 2017

Int J Adv Eng Sci Appl Math

Self Cite

View full text Add to dashboard Cite

show abstract

“…Cracking of the concrete cover is usually the first visible sign of the ongoing deterioration. It also speeds up the corrosion deterioration, as cracks enable faster ingress of chloride, carbon dioxide, and moisture [1]. Very little research has focused on nondestructive and continuous monitoring of the cracking process caused by reinforcement corrosion.…”

Section: Introductionmentioning

confidence: 99%

Cracking of SHCC due to reinforcement corrosion

Šavija¹,

Luković²,

Pacheco³

et al. 2016

Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures

Self Cite

View full text Add to dashboard Cite

Abstract. Reinforcement corrosion is the most important deterioration mechanism affecting reinforced concrete infrastructures. After corrosion starts, expansive pressures are exerted onto the surrounding concrete, causing cracking and spalling of the cover concrete. The amount of cover cracking can possibly be reduced by using strain hardening cementitious composites (SHCCs). In this work, the ability of strain hardening cementitious composite to resist cracking due to corrosion of reinforcement is studied. An accelerated corrosion experiment is performed to speed up the corrosion process. Micro-computed X-ray tomography technique (CT-scanning) was used for monitoring rust formation during accelerated corrosion of reinforcement and subsequent cover cracking. Development of cracks in SHCC specimen was compared to a reference specimen. While the SHCC specimen developed a large number of small cracks, the reference specimen exhibited extensive spalling due to corrosion. The SHCC specimen showed superior performance compared to the reference specimen due to its multiple microcracking ability. SHCC proved to be an excellent alternative to brittle cementitious materials when corrosion induced cracking of the cover is a concern.

show abstract

“…Durch Mikrorissbildungen oder Gefügestörungen kann es zu lokalen Überschreitungen des kritischen Chloridgehalts kommen. SAVIJA et al haben sich in [14] u. a. mit dieser Problematik beschäftigt und haben festgestellt, dass durch makroskopische Untersuchungsmethoden, insbesondere im Bereich von Rissen, Chloridkonzentrationen zum Teil deutlich unterschätzt werden können.…”

Section: Praktische Anwendungenunclassified

Laser Induced Breakdown Spectroscopy (LIBS) im Bauwesen – automatisierte Baustoffanalyse

Millar

Wilsch

Eichler³

et al. 2015

Beton und Stahlbetonbau

Self Cite

View full text Add to dashboard Cite

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 Phasen im Baustoff. So können beispielsweise die für die Alkali‐Kieselsäure‐Reaktion (AKR) interessanten Natriumkonzentrationen bestimmt und hinsichtlich ihrer Verteilung aufgelöst werden. Es lassen sich Natriumgehalte, welche sich in der Gesteinskörung befinden, separat von denen der Betonmatrix bestimmen. Der vorliegende Artikel befasst sich mit den Vor‐ und Nachteilen von LIBS als alternative Methode für die chemische Analyse von Baustoffen. Anhand von Beispielen aus der Praxis wird der derzeitige Stand der Technik dargestellt und ein Vergleich mit etablierten Messmethoden vorgenommen. Laser Induced Breakdown Spectroscopy (LIBS) in civil engineering – innovative analysis of building materials Compared to conventional methods the Laser Induced Breakdown Spectroscopy (LIBS) provides significant advantages for analysis of heterogeneous, mineral building materials as e.g. concrete. Besides providing the possibility to quantify element concentrations and distributions in building materials, this technique enables also to differentiate concentrations within different phases of the material. It is possible to determine sodium concentrations and distribution directly, which e.g. is important when regarding Alkali‐Silica‐Reaction (ASR). Sodium contents provided by the aggregates can be distinguished from those provided by the concrete matrix. The present article is concerned with the advantages and disadvantages of LIBS as alternative method for chemical analysis of building materials. On the basis of samples from practice the current state of the art is shown and different measurement techniques will be compared.

show abstract

Chloride ingress in cracked concrete: a laser induced breakdown spectroscopy (LIBS) study

Cited by 37 publications

References 23 publications

Development of ductile cementitious composites incorporating microencapsulated phase change materials

Development of ductile cementitious composites incorporating microencapsulated phase change materials

Cracking of SHCC due to reinforcement corrosion

Laser Induced Breakdown Spectroscopy (LIBS) im Bauwesen – automatisierte Baustoffanalyse

Contact Info

Product

Resources

About