Development of compression pull-off test (CPOT) to assess bond strength of bitumen

Rahim, Abdur; Thom, Nick; Airey, Gordon

doi:10.1016/j.conbuildmat.2019.02.093

Cited by 18 publications

(3 citation statements)

References 35 publications

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“…The results showed that fibers led to an increased pull-off tensile strength of the mastics and changed the failure mode from cohesive to hybrid, implying an improvement in the cohesive strength of the mastic. Rahim, A. et al developed the compression pull-off test (CPOT) to study the cohesive and adhesive bond strength of binders [27]. They concluded that the COPT was useful for investigating the phenomenon of cavitation and fibrillary concentration in the cohesive bonds of asphalt and mastics.…”

Section: Introductionmentioning

confidence: 99%

A Study of the Bond Strength and Mechanism between Basalt Fibers and Asphalt Binders

Sun,

Kou,

et al. 2024

Applied Sciences

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The bond strength between basalt fibers and asphalt binders is an important parameter that can be used to evaluate the influence of basalt fibers on the mechanical properties of asphalt binders and asphalt mixtures. To date, however, there remains a lack of methods that can be used to assess the bond strength between basalt fibers and asphalt binders. This study employed a fiber-asphalt pull-out tester (POT). Significant upward, peak, and downward stages were observed from the relationship curves between the pull-out force (POF) and displacement, corresponding to the holding stage and reaching the maximum POF stage and the sliding or failure stage between fibers and asphalt binders. Maximum POF is recommended to calculate the bond strength between basalt fibers and asphalt binders. The types of asphalt binders suitable for basalt fibers and the appropriate fiber embedding depths for different types of asphalt binders guiding the selection of fiber length are recommended based on the influence of fiber embedding depth and asphalt binders on the fiber–asphalt bond strength. In addition, surface energy was used to calculate the bond strength as well. Surface energy was determined from contact angle measurements using the sessile drop method. Furthermore, a scanning electron microscope (SEM) was employed to examine the bond mechanism between asphalt binders and basalt fibers. These experiments showed how basalt fibers serve to reinforce asphalt mixtures by bonding with asphalt binders.

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Section: Introductionmentioning

confidence: 99%

A Study of the Bond Strength and Mechanism between Basalt Fibers and Asphalt Binders

Sun,

Kou,

et al. 2024

Applied Sciences

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“…Conventional adhesive strength tests such as the pneumatic adhesion tensile testing instrument (PATTI) and BBS have certain limitations and have been continuously improved [23]. The compression pull-off test has been developed and proven to be excellent [37]. Considering the complexity of adhesion and the diversity of test methods, the adhesion mechanism of crumb-rubber-modified asphalt needs to be further explored.…”

Section: Introductionmentioning

confidence: 99%

Investigations on Adhesion Characteristics between High-Content Rubberized Asphalt and Aggregates

et al. 2022

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The use of waste tires to prepare rubberized asphalt has been a hot trend in recent years, and the characteristics of adhesion between rubberized asphalt and aggregates are important factors affecting the performance of asphalt pavement. However, there is a lack of uniform results on the adhesion characteristics of rubberized asphalt. Therefore, crumb-rubber-modified asphalt (CRMA) with 15%, 20%, and 25% rubber contents was prepared in this work, and the basic rheological parameters and cohesive energy of the rubberized asphalt were characterized by DSR. The adhesion properties between rubberized asphalt and aggregates were characterized based on macroscopic binder bond strength (BBS), surface free energy (SFE) theory, and nanoscale atomic force microscopy (AFM) tests. The results show that crumb rubber (CR) can improve the high-temperature elastic properties of asphalt; secondly, CR can have a negative impact on the maximum tensile strength of asphalt and aggregates. CR can improve the SFE parameter of asphalt. The work of adhesion of rubberized asphalt and limestone is the highest, followed by basalt and, finally, granite. Finally, CR can cause the catanaphase in asphalt to gradually break down and become smaller, and the adhesion of rubberized asphalt can be reduced. Overall, CR can reduce the adhesion performance of asphalt, and this work provides a reference for the application of rubberized asphalt.

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“…Compared to the other methods, Gan [24] pointed out that the pull-off test method could visually reflect the true adhesion strength with the advantages of simple and easy operations. Other studies [25,26] have also shown that the pull-off test is easy to observe and it could be used to determine the failure state of the asphalt-aggregate system by recording the magnitude of the bond strength. Considering the effect of aged asphalt and aggregates in RAP, Yan et al [27] used the coating treatment to simulate the RAP aggregate state and evaluated the adhesion of fresh asphalt binder to RAP aggregate by BBS test.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Adhesion Characteristics of Virgin-Aged Composite Binder and Binder-Aggregate System

Zhan

et al. 2022

Coatings

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In recycled asphalt mixtures, the RAP binder often becomes stiff and brittle due to aging, making it difficult to achieve a complete integration with the added virgin binder, which could provide a negative impact on the long-term performance of the recycled asphalt mixtures. In an attempt to identify the influence of the integration degree on the adhesion characteristics of virgin-aged composite binder and the corresponding binder-aggregate system, a series of experiments, including the modified boiling test and pull-off test and corresponding formation methods for the binder samples with various interfusion states, were designed and carried out in the present study. The two-layered composite binder (CB), consisting of a layer of virgin binder and a layer of aged binder was fabricated for the experiments, and the testing results were analyzed and compared with those of the virgin binder (VB), the aged binder (AB), and the blended binder (BB). The thermostatic treatments with various durations were subjected to the binder samples to attribute them with various integrations, and the wetting conditioning was also imposed on them to introduce the impact of moisture erosions. The rheological properties, creep recovery capacity, and fatigue resistance of the binders were first investigated based on a dynamic shear rheometer. The adhesion characteristics and failure behaviors of the binder-aggregate system were furthermore explored with the modified boiling test and pull-off test, and the percentage of residual binder (%_residual binder), pull-off test strength (POTS), and moisture damage index (MDI) were adopted to assess or quantify their adhesion characteristics and moisture susceptibility. The results found that the rheological properties and creep recovery capacity of the CB were similar to those of the VB, and its fatigue life exhibited an increasing trend with the extension of the thermostatic-treatment duration. In contrast to the modified boiling test, the pull-off test was more effective at evaluating the integration and distinguishing the failure behaviors of the binder-aggregate system. As the thermostatic-treatment duration prolonged, the interfusion between the virgin and the aged binder was facilitated, the cohesion within the binder and the adhesion between the binder and the aggregate was also enhanced, and thus the adhesion performance and moisture-damage resistance of the system were improved.

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Development of compression pull-off test (CPOT) to assess bond strength of bitumen

Cited by 18 publications

References 35 publications

A Study of the Bond Strength and Mechanism between Basalt Fibers and Asphalt Binders

A Study of the Bond Strength and Mechanism between Basalt Fibers and Asphalt Binders

Investigations on Adhesion Characteristics between High-Content Rubberized Asphalt and Aggregates

Investigation on Adhesion Characteristics of Virgin-Aged Composite Binder and Binder-Aggregate System

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