Keywords
pull off tensile stress
aggregate
sanding
Ensayo de resistencia del enlace adhesivo
esfuerzo de tracción
agregado
pulido
How to Cite
Abstract
The study of mechanical properties of pavement materials is an essential part for their initial characterization. Therefore, the reproducibility and constant improvement of the tests involved allow to obtain faithful results, reducing the potential errors and variability that might occur during sample preparation. For this reason, this study focuses in establishing criteria and nominal values to obtain an adequate finish in the aggregate sources. This intends to reduce the standard deviation of the uniaxial tensile test, carried out by means of the bitumen bond strength test on dry conditions. The aggregates were treated by a sanding process for 60 seconds, repeating such cycles 10 times per sample. Also, abrasive bands of varying grain numbers were used. A Pull-Off Tensile Strength (POTS) of 2.39 (0.29) MPa was achieved, where the value in parentheses corresponds to the standard deviation. This value was selected due to the best conditions found in the experiment. Furthermore, a linear model obtained by a factorial design demonstrated the main effects provide up to 84 % correlation with the pneumatic stress and up to 78 % with its standard deviation, which is considered satisfactorily since the p-value defined in this research as the approval probability for the recommended conditions is 6,56·10-4, demonstrating statistical significance.
References
The American Association of State Highway and Transportation Officials (2020). Standard Method of Test for Determining Asphalt Binder Bond Strength by Means of the Binder Bond Strength (BBS) Test (AASHTO T361-16).
ASTM International (2018). Standard Test Method for Coating Flexibility of Prepainted Sheet (D4145-10). DOI: 10.1520/D4145-10R18
Cardone, F., Virgili, A., y Graziani, A. (2018). Evaluation of bonding between reclaimed asphalt aggregate and bitumen emulsion composites. Construction and Building Materials, 184, 565-574. DOI: 10.1016/j.conbuildmat.2018.07.016
Das, A., y Singh, D. (2018). Effects of Regular and Nano Sized Hydrated Lime Fillers on Fatigue and Bond Strength Behavior of Asphalt Mastic. Transportation Research Record, 2672(28), 31-41. DOI: 10.1177/0361198118759064.
Moraes, R., Velasquez, R., y Bahia, H. U. (2011). Measuring the effect of moisture on asphalt–aggregate bond with the bitumen bond strength test. Transportation Research Record 2209(1), 70-81. DOI: 10.3141/2209-09
Sarkar, M., Rahman, M., Elseifi, M., Mayeux, C., y Cooper, S. (2020). Rheological and Molecular Characterizations of Tire Rubber Modified Asphalt Emulsion. Transportation Research Record, 2674(3), 12-26. DOI: 10.1177/0361198120908871
Strategic Highway Research Program (1991). The effect of the physical and chemical characteristics of the aggregate on bonding (SHRP-A/UIR-91-507). Recuperado de: http://onlinepubs.trb.org/onlinepubs/shrp/SHRP-91-507.pdf
Tausif, M., Zaidi, S., Ahmad, N., y Jameel, M. (2020). Influence of Natural Zeolite and Paraffin Wax on Adhesion Strength Between Bitumen and Aggregate. Civil Engineering Journal, 6(4), 733-742. DOI: 10.28991/cej-2020-03091505.
Tencio, S (2019). Determinación de las mejores condiciones de preparado de muestra para las pruebas de energía superficial y adhesión neumática en agregado con análisis topológico superficial para la generación de un protocolo (Tesis de grado). Universidad de Costa Rica, San José.