Fractal–fracture analysis and characterization of impact-fractured surfaces in different types of concrete using digital image analysis and 3D nanomap laser profilometery

Erdem, Savaş; Blankson, Marva Angela

doi:10.1016/j.conbuildmat.2012.11.013

Cited by 58 publications

(31 citation statements)

References 18 publications

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“…Erdem and Blankson [41] quantitatively determined the fractal character and texture of fracture surfaces investigated their influence on the fracture-related properties in different types of concrete having different interfacial bonding properties and coarse aggregate characteristics. They produced various conclusions on the interfacial zone, texture and aggregate characteristics of the concrete.…”

Section: Studies In the Recent Pastmentioning

confidence: 99%

A Review on Studies of Fracture Parameters of Self-compacting Concrete

Rama

Sivakumar

Vasan

et al. 2015

Advances in Structural Engineering

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In the recent past, the use of self-compacting concrete (SSC) as a primary structural material in complex structures such as tall buildings, submerged structures, bridges, dams, liquid and gas containment structure has increased enormously. Proper understanding of the structural behavior of SCC is absolutely necessary in designing complex concrete structures. Due to the presence of microcracks and other inherent flaws, the strength of the concrete structure decreases. Engineering fracture mechanics can deliver the methodology to compensate the inadequacies of conventional design concepts. It might be expected that SCC would exhibit more brittle behavior than normal/conventional concrete. The improved pore structure and better densification of matrix have great influence on the fracture characteristics of SCC. It is widely agreed that the strength, elastic modulus and fracture resistance of SCC decreases slightly with increased paste content. Increasing the volume of paste tends to make SCC brittle. Due to the quasi-brittle nature of concrete; various computational fracture models have been developed to study the crack characterizing parameters in concrete structures, such as fictitious crack model, crack band model, two parameter fracture model, size effect model, smeared crack model, cohesive crack band model and effective crack model. Compared to conventional vibrated concrete, self-compacting concrete often has a higher susceptibility to crack due to different mixture design, material properties and construction practices. Many studies have addressed the SCC fracture properties using different computational models. As mentioned above, all these studies are purely computational and there is no support or evidence from the experiments. This paper deals with presenting the various models as well as experimental investigations that have already been conducted by some of the researchers to study the exposure of self-compacting concrete to crack.

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Section: Studies In the Recent Pastmentioning

confidence: 99%

A Review on Studies of Fracture Parameters of Self-compacting Concrete

Rama

Sivakumar

Vasan

et al. 2015

Advances in Structural Engineering

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“…2) wraz z oprogramowaniem analitycznym Talymap, do szybkiego bezstykowego pomiaru topografii powierzchni 3D oraz programu komputerowego FRAKTAL_Wymiar2D 3 . Zastosowanie profilometrów laserowych do analizy morfologii powierzchni betonów jest coraz częstsze [17,18].…”

Section: Zakres I Metodyka Badańunclassified

Fractal description of cement concretes fracture surface

Konkol

Prokopski

2014

JCEEA

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W artykule zaprezentowano podejście do określania wymiaru fraktalnego linii profilowej wydzielonej z powierzchni przełomu betonu z uwzględnieniem w analizie takich składników struktury, jak: ziarno kruszywa grubego oraz stwardniały zaczyn cementowy. W przypadku zarówno zaczynu cementowego, jak i ziaren kruszywa grubego analizie fraktalnej poddano dwa warianty. Dla ziaren kruszywa obliczono wymiar fraktalny D w przypadku przełomu poziarnowego oraz w przypadku przejścia pęknięcia na wskroś ziarna. Zaczyn cementowy poddano natomiast analizie w przypadku przełomu powstałego przez sam zaczyn cementowy oraz w przypadku powierzchni przełomu powstałej na skutek oddzielenia się kruszywa od matrycy cementowej (odcisk w zaczynie po przełomie poziarnowym). Badania fraktalne przeprowadzono na powierzchniach przełomu betonów dwiema metodami: pudełkową (D BC ) i obwiedni morfologicznej (D m ). Wykazano, że znaczący wpływ na wartość obu wymiarów fraktalnych D BC i D m mają ziarna kruszywa grubego bez względu na charakter pęknięcia. Stwierdzono, że największy wymiar fraktalny mają pęknięcia przechodzące przez ziarna kruszywa grubego, występujące zarówno w przypadku pęknięć poziarnowych ziaren kruszywa, jak i pęknięć ziaren kruszywa na wskroś. W obu wariantach uzyskano wartości wymiaru fraktalnego obiema metodami o około 11 % większe, aniżeli wartości wymiaru fraktalnego otrzymane w przypadku przejścia pęknięcia przez matrycę cementową. Na podstawie uzyskanych wyników stwierdzono, że wymiar fraktalny D linii profilowej może być określany jako wartość średnioważona, uwzględniająca udział różnych typów pęknięć znajdujących się na linii profilowej.Słowa kluczowe: beton, powierzchnia przełomu, wymiar fraktalny, analiza powierzchni, profilometr laserowy.

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“…More specifically, the first layer of adhesive that contacts the CFRP strip plays an important role in developing strong bond. Subsequently, a dense and uniform adhesive layer can effectively improve development of strength in strengthening systems [13]. However, a bond area with an adhesive layer that containing many defects will increasingly degrade and lose load capacity [12].…”

Section: Three-dimensional Laser Profilometery Analysesmentioning

confidence: 99%

“…The analyses results were then used to explain the utilization of the CFRP strips [10,11]. Some researchers refered to the importance of the nature of the CFRP strip-adhesive bond and described the bond as an effective factor in both of decreasing and/or increasing the overall strength and durability of strengthening systems [12,13]. More specifically, the first layer of adhesive that contacts the CFRP strip plays an important role in developing strong bond.…”

Section: Three-dimensional Laser Profilometery Analysesmentioning

confidence: 99%

Assessing the Contribution of the CFRP Strip of Bearing the Applied Load Using Near-Surface Mounted Strengthening Technique with Innovative High-Strength Self-Compacting Cementitious Adhesive (IHSSC-CA)

2018

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Efficient transfer of load between concrete substrate and fibre reinforced polymer (FRP) by the bonding agent is the key factor in any FRP strengthening system. An innovative high-strength self-compacting non-polymer cementitious adhesive (IHSSC-CA) was recently developed by the authors and has been used in a number of studies. Graphene oxide and cementitious materials are used to synthesise the new adhesive. The successful implementation of IHSSC-CA significantly increases carbon FRP (CFRP) strip utilization and the load-bearing capacity of the near-surface mounted (NSM) CFRP strengthening system. A number of tests were used to inspect the interfacial zone in the bonding area of NSM CFRP strips, including physical examination, pore structure analysis, and three-dimensional laser profilometery analysis. It was deduced from the physical inspection of NSM CFRP specimens made with IHSSC-CA that a smooth surface for load transfer was found in the CFRP strip without stress concentrations in some local regions. A smooth surface of the adhesive layer is very important for preventing localized brittle failure in the concrete. The pore structure analysis also confirmed that IHSSC-CA has better composite action between NSM CFRP strips and concrete substrate than other adhesives, resulting in the NSM CFRP specimens made with IHSSC-CA sustaining a greater load. Finally, the results of three-dimensional laser profilometery revealed a greater degree of roughness and less deformation on the surface of the CFRP strip when IHSSC-CA was used compared to other adhesives.

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Fractal–fracture analysis and characterization of impact-fractured surfaces in different types of concrete using digital image analysis and 3D nanomap laser profilometery

Cited by 58 publications

References 18 publications

A Review on Studies of Fracture Parameters of Self-compacting Concrete

A Review on Studies of Fracture Parameters of Self-compacting Concrete

Fractal description of cement concretes fracture surface

Assessing the Contribution of the CFRP Strip of Bearing the Applied Load Using Near-Surface Mounted Strengthening Technique with Innovative High-Strength Self-Compacting Cementitious Adhesive (IHSSC-CA)

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