The characterisation of foamed asphalt cement using a rotational viscometer

Ryan, John; Braham, Andrew

doi:10.1080/10298436.2015.1122191

Cited by 12 publications

(4 citation statements)

References 14 publications

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“…The expert group's weight factors are calculated using Equation (19), and the different opinions are summarized. The aggregation calculation followed Equation (8) with the relaxation factor α set to 0.5 to ensure the evaluation objectivity. As an example, Table 1 details the calculations for event X20.…”

Section: Bottommost Events' Fuzzy Number Aggregationmentioning

confidence: 99%

“…Since foamed asphalt recycling technology has widespread applications, many scholars are studying foamed asphalt. These studies have focused-for example-on foamed asphalt's performance [6][7][8], the influence of foaming parameters [9][10][11], and the development of asphalt foaming equipment [12][13][14]. Nevertheless, the current studies have not evaluated the reliability of the asphalt foaming device and in China, there are few studies on the optimum foaming viscosity of asphalt in the foaming regeneration technology of asphalt.…”

Section: Introductionmentioning

confidence: 99%

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A Study of Foam Bitumen Preparation for Effective Recycling of Pavement Layers

2022

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Foamed asphalt recycling technology can effectively recover waste asphalt pavement materials and achieve the sustainable utilization of resources. This technology’s core equipment is asphalt foaming equipment. Since the asphalt foaming device’s fault data are uncertain, this work proposes a method for evaluating the device’s reliability, combining triangular intuitionistic fuzzy numbers, trapezoidal intuitionistic fuzzy numbers, and expert knowledge. Using the proposed evaluation method, the failure probability of the asphalt foaming device and the importance of the bottom event were calculated. The obtained model results were found to be consistent with the actual collected data, verifying the reliability and validity of the model. Furthermore, the asphalt viscosity is one of the key factors affecting the asphalt foaming recycling technology. In this work, the influence of different viscosities on the asphalt foaming mechanism was investigated using a theoretical analysis. Then, a computational fluid dynamics (CFD) analysis method was employed to simulate the different viscosity asphalt foaming processes, aiming to identify the most suitable one for the production of high-quality foam asphalt in the foaming asphalt viscosity range. Finally, experiments were carried out to verify the results of the analysis. The results show that the asphalt foaming device’s failure probability was around 7.512 × 10−2, and the best foaming asphalt viscosity was in the range of 0.3~0.5 Pa·s.

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Section: Bottommost Events' Fuzzy Number Aggregationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Study of Foam Bitumen Preparation for Effective Recycling of Pavement Layers

2022

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“…Viscosity is normally used to evaluate the rheological properties of asphalt. The workability of asphalt mixture has an intimate correlation with the rotational viscosity of asphalt binders at high temperature tested by a Brookfield viscometer [ 25 , 26 ]. For the foamed asphalt, however, it is hard to measure the viscosity accurately by the standard RV test due to the volume variation of asphalt and the interference of water bubbles [ 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Moisture Dissipation of Water-Foamed Asphalt and Its Influence on the Viscosity

Tang

et al. 2020

Materials

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Water-foamed asphalt is capable of improving the workability of asphalt mixture. It has been extensively used for its energy-saving and emission-reducing features. Water plays an essential part in improving the workability of water-foamed asphalt mixture. However, there is still lack in profound studies of moisture dissipation of the water-foamed asphalt over time and its influence on workability. In this study, the evolutions of residual water content and rotational viscosity of the water-foamed asphalt with time were respectively measured by the analytical balance and modified rotational viscometer (RV). The atomic force microscopy (AFM) analysis was conducted to discuss the mechanism of viscosity reduction of water-foamed asphalt. The results showed that moisture evaporation is significantly influenced by the foaming water content and ambient temperature, which results in the different stabilizing time of water-foamed asphalt. When water-foamed asphalt was stabilized, the residual water inside the asphalt was less than 0.01% relative to the asphalt mass. The AFM analysis showed that the foaming process changed the distribution of wax in the water-foamed asphalt resulting in reduction of viscosity. The viscosity reduction of asphalt is highly related to the initial foaming water content. After the foaming process, the viscosity keeps stable and is independent of moisture dissipation.

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“…Traditional measurement tools for viscosity include capillary viscometers, 5 microfluidic viscometers, 6 and rotational viscometers, 7 which cannot be applied in living cells or in vivo . In contrast, fluorescent probes have inherent superiorities including low bioluminescence damage, good biocompatibility and real-time imaging, 8 and they can achieve sensitive detection of abnormal changes of viscosity in the intracellular microenvironment.…”

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confidence: 99%