Fracture evaluation of multi-layered precast reinforced geopolymer-concrete composite beams by incorporating acoustic emission into mechanical analysis

Ranjbar, Navid; Behnia, Arash; Chai, Hwa Kian; Alengaram, U. Johnson; Jumaat, Mohd Zamin

doi:10.1016/j.conbuildmat.2016.09.144

Cited by 34 publications

(11 citation statements)

References 22 publications

(27 reference statements)

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“…However, higher energy absorption in all the geopolymer specimens shows the more ductility of this material compare with OPC. A similar conclusion was derived by comparison of flexural performance of reinforced geopolymer and OPC concrete beams [42].…”

Section: Sem-eds Characterizationsupporting

confidence: 81%

Clayey soil stabilization using geopolymer and Portland cement

Ghadir

Ranjbar

2018

Construction and Building Materials

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275

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This study compares the mechanical performance of clayey soil stabilization using volcanic ash (VA) based geopolymer and ordinary Portland cement (OPC). The effects of curing conditions and time, alkali activator/clay and alkali activator molarity, and VA/clay ratio are determined. The compressive strength of the untreated clayey soil specimens could be increased from 0.2 to 4 MPa and 2 to 12 MPa at the OC and DC conditions, respectively, when the soil partially replaced by 15 wt% of the binders. It is observed that geopolymer treatment is more efficient at the dry conditions (DC) while the Portland cement is superb at the wet environments (OC). This difference is associated with the role of water and pH in the kinetics of geopolymerization and the Portland cement hydration. Moreover, increasing the molarity of alkali activator and alkali activator/clay improve the compressive strength of the geopolymer treated soil. Besides, the higher energy absorption in all geopolymer specimens shows the superior ductility of this material in comparison with OPC.

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Section: Sem-eds Characterizationsupporting

confidence: 81%

Clayey soil stabilization using geopolymer and Portland cement

Ghadir

Ranjbar

2018

Construction and Building Materials

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275

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“…A flecha máxima da viga A1 é 0,13 mm e da viga G1 é 0,14 mm. Esse resultado corrobora com o encontrado por RANJBAR [3], que produziu vigas de concreto com multicamadas de argamassa geopolimérica. Segundo este pesquisador, as vigas compostas com uma camada de geopolímero na zona de tração apresentaram maior deflexão do que as vigas de concreto convencional de referência, sem aumento considerável na sua capacidade portante.…”

Section: Vigas Reparadas Com Argamassa Comercial E Geopoliméricaunclassified

“…Um material alternativo para reparo de estruturas é o geopolímero, que apresenta excelente aderência ao aço e ao concreto convencional, além de elevado ganho de resistência inicial [2,3]. Os geopolímeros são materiais poliméricos inorgânicos de microestrutura entre amorfa e semicristalina, que possuem propriedades físicas, químicas e mecânicas que permitem sua utilização como material de reparo.…”

Section: Introductionunclassified

Vigas de concreto reparadas com argamassa geopolimérica

et al. 2018

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RESUMO Este trabalho avaliou a eficácia de uma argamassa geopolimérica como material para recuperação de vigas de concreto convencional, objetivando restaurar o caráter monolítico e a capacidade portante inicial da estrutura reparada. Para isso, vigas de concreto reabilitadas com argamassa geopolimérica e com argamassa de reparo comercial foram analisadas e comparadas com vigas de referência sem reparo, por meio de ensaios de resistência à tração na flexão e de resistência de aderência ao cisalhamento na flexão. Os resultados mostram que as maiores deflexões ocorreram para os corpos de prova recuperados com argamassa geopolimérica (quando comparadas às vigas de referência de concreto monolítico) sem, no entanto, haver aumento considerável na carga de ruptura, justificado pelo baixo módulo de elasticidade longitudinal do material de reparo. As vigas recuperadas com argamassa geopolimérica apresentaram comportamento de ruptura muito semelhante ao das vigas de referência, ou seja, comportaram-se monoliticamente, ao contrário das recuperadas com argamassa comercial, que apresentaram descolamento da interface substrato/reparo. Os resultados sugerem que a argamassa geopolimérica possui potencial para ser utilizada como material alternativo em reparo de vigas de concreto convencional devido, principalmente, à aderência satisfatória ao concreto do substrato, à carga de ruptura próxima à da viga monolítica de referência e à melhor qualidade em relação à argamassa comercial.

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“…The premise of AE refers to the generation of transient elastic waves during the rapid release of energy from a localized source within a material. AE is a non-destructive testing technique with several unique features including real time monitoring capability, high sensitivity, global monitoring capability, source location, sensitivity to processes or mechanisms that generates stress waves, and passive nature (utilizing energy generated by damage source omits the need for supplying external energy) [20][21][22][23]. These features allow employment of AE as an informative online assessment technique for a wide range of structures and for various purposes.…”

Section: Introductionmentioning

confidence: 99%

A novel damage index for online monitoring of RC slabs under monotonic loading by integration of process controlling into acoustic emission technique

Behnia

Chai

Mousa

et al. 2019

Mechanical Systems and Signal Processing

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This study introduces a novel structural health monitoring scheme for cementitious composite slabs with the aid of acoustic emission (AE) technique coupled with statistical process controlling (SPC) method. The adopted framework is an integrated monitoring solution that effectively relates current state (damaged) to reference state of the structure. Evaluation of the latter was made possible using autoregressive model incorporating a set of damage-sensitive feature. In order to provide a benchmark damage indicator, the collected data were processed using control chart analysis. The damage indicators for the former was similarly obtained and then compared with the benchmark to gauge the structural damage. These control charts offer a robust framework meticulously identifying inconsistency in the damage-sensitive feature imposed over the monitoring period. Linear and quadratic projections were also incorporated into SPC model to enhance identification of system transition to other damage states.

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Fracture evaluation of multi-layered precast reinforced geopolymer-concrete composite beams by incorporating acoustic emission into mechanical analysis

Cited by 34 publications

References 22 publications

Clayey soil stabilization using geopolymer and Portland cement

Clayey soil stabilization using geopolymer and Portland cement

Vigas de concreto reparadas com argamassa geopolimérica

A novel damage index for online monitoring of RC slabs under monotonic loading by integration of process controlling into acoustic emission technique

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