Fatigue characterization of binder with aging in two length scales: sand asphalt mortar and parallel plate binder film

Kommidi, Santosh Reddy; Kim, Yong-Rak; Rezende, Lilian Ribeiro de

doi:10.1016/j.conbuildmat.2019.117588

Cited by 20 publications

(9 citation statements)

References 30 publications

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“…Although time sweep testing can simulate the fatigue process more directly than LAS, it requires more testing time and many specimens because of the testing variability, which is a general aspect of fatigue testing. As presented in the study, the modified LAS testing of SAM was repeatable, with a very low coefficient of variation (3.5%) compared with time sweep testing (coefficient of variation of 5%–30%) ( 38 ). The previous study concluded that SAM is sensitive to capturing fatigue cracking, particularly under the influence of aging, and can be considered an appropriate solid phase to evaluate the properties and fatigue damage characteristics of binders and mastics under various conditions; several further investigations were also recommended.…”

mentioning

confidence: 71%

“…SAM is a mixture of uniformly graded sand particles and an asphalt binder (or mastic) added to the standard sand at a certain percentage by weight. SAM specimens were fabricated by mixing an unaged polymer modified binder (PG 64-34) with the same Ottawa sand that was used in previous studies (32)(33)(34)(35)(36)(37)(38)(39).…”

Section: Methodsmentioning

confidence: 99%

“…Development of a proper testing method requires both SAM specimen fabrication and determination of the testing procedure. An initial method used by Kim et al was revisited in a recent study to improve the compaction efficiency and enable the SAM specimen to be densified evenly from both ends to increase testing repeatability (32)(33)(34)(35)(36)(37)(38). The authors examined the modified linear amplitude sweep (LAS) testing method instead of the initial method based on time sweep testing.…”

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confidence: 99%

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Strain Sweep Fatigue Testing of Sand Asphalt Mortar to Investigate the Effects of Sample Geometry, Binder Film Thickness, and Testing Temperature

Rezende

Kommidi

Kim

et al. 2021

Transportation Research Record: Journal of the Transportation R

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This study evaluated the viscoelastic fatigue behavior of binder using strain sweep fatigue testing of cylindrical sand asphalt mortar (SAM) samples. The SAM samples can represent the realistic film thickness (such as 10–70 μm thick) of the binder in mixtures, while testing repeatability-efficiency can still be met as a result of the use of a standard sand as a load carrier between binder films. A proper testing protocol is still under development, and one of the unknowns in the field is a set of testing conditions that can provide repeatable and case-sensitive test results. Toward that end, SAM samples with different dosages of binder in three geometries were tested at varying temperatures in this study. A PG 64-34 binder was used, and a strain sweep test using a dynamic shear rheometer was conducted to compare the test results from the different cases. Four parameters resulting from the SAM testing were examined: two accounting for material linear viscoelastic behavior and two accounting for fatigue damage characteristics. The parameters were incorporated with statistical analyses to quantitatively evaluate data variability and sensitivity influenced by the binder film thickness, SAM specimen geometry, and testing temperature. The coefficient of variation was less than 20% for all the cases, which indicated the validity of the SAM method attempted in this study. Results also indicated that fatigue behavior was independent of the SAM geometries used in this study, while binder film thickness and testing temperature significantly affected test results.

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confidence: 71%

Section: Methodsmentioning

confidence: 99%

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confidence: 99%

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Strain Sweep Fatigue Testing of Sand Asphalt Mortar to Investigate the Effects of Sample Geometry, Binder Film Thickness, and Testing Temperature

Rezende

Kommidi

Kim

et al. 2021

Transportation Research Record: Journal of the Transportation R

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“…The method developed by Kommidi and Kim (2019) was used to compact the FAMs. In the first stage of this method, the fine aggregates (200 g) and the asphalt binder are taken to the oven and heated at the mixing temperature (148 °C) for 30 minutes.…”

Section: Fine Aggregate Matrices (Fams)mentioning

confidence: 99%

Rejeito de minério de ferro como agregado mineral fino em misturas asfálticas

Oliveira

Faxina

2021

TRANSPORTES

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A crescente produção mineral gera volumes gradativamente maiores de resíduos sólidos, motivando a realização de estudos que viabilizem o aproveitamento desses resíduos em outras áreas. O objetivo deste trabalho é avaliar a utilização do rejeito de flotação do minério de ferro, que se assemelha a uma areia fina, como material constituinte de misturas asfálticas. Foram produzidas misturas asfálticas completas (MAC) e matrizes de agregados finos (MAF) empregando agregados de gnaisse e rejeito de minério de ferro. A MAC foi avaliada por meio da resistência à tração e dano por umidade induzida. As MAFs foram submetidas a ensaios de fadiga no reômetro de cisalhamento dinâmico, gerando modelos de fadiga das amostras com e sem condicionamento à umidade. A melhor adesividade do ligante asfáltico ao rejeito proporcionou maior resistência à tração na MAC e maior vida de fadiga à MAF condicionada, além de reduzir a suscetibilidade à umidade nas duas escalas.

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“…Naturally, selfcompacted samples are limited to smaller max aggregate size, typically between 0.5 mm and 1 mm. On the other hand, compacted samples are either drilled out of compacted cylindrical tablets [24] or compacted in metal moulds [25]. Those samples are also known as Fine Aggregate Matrix (FAM).…”

mentioning

confidence: 99%