Investigating physical and rheological properties of foamed bitumen

Martínez-Arguelles, Gilberto; Giustozzi, Filippo; Crispino, Maurizio; Flintsch, Gerardo W.

doi:10.1016/j.conbuildmat.2014.09.024

Cited by 50 publications

(22 citation statements)

References 17 publications

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“…This is achieved by investigating the foaming properties of the bitumen. Researchers have reported that the foaming process limits the ageing of the binder and the mixtures (Xiao et al 2013;Martinez-Arguelles et al 2017). In contrast, research by Nivedya et al (2013) indicated that the foamed binder at lower shear rates exhibited viscosity close to the RTFO binder.…”

Section: Introductionmentioning

confidence: 85%

Impact of low viscosity grade bitumen on foaming characteristics

Kar¹,

Swamy

Tiwari³

et al. 2018

J. S. Afr. Inst. Civ. Eng.

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The construction of highway infrastructure requires large quantities of construction materials and is an energy-intensive activity. Issues like scarcity of construction materials, increasing cost of materials, increasing cost of construction processes, and the emphasis on less polluting construction procedures have led to advancements in pavement construction practices. One such example is foamed bitumen technology. In this process, cold water is injected into a hot bitumen medium, which leads to drastic expansion of bitumen, forming a fine mist or foam. The performance of foam bitumen mixtures is influenced by the bitumen properties, as well as by the foaming process. This paper deals with research on the rheology of three different types of binders having low viscosity (in the range of 500 to 3 000 Poise at 60°C) on foaming characteristics. The water content and temperature also have significant effects on foam decay and the expansion ratio of foam. Results show that a low viscosity bitumen consumes less energy during the foam process compared to high viscosity bitumen. The conclusion drawn from this study is that the expansion ratio and half-life of foam bitumen depend on the rheology of the bitumen, as well as on the chemical composition of the bitumen. It was concluded that, with an increase in carbonyl and sulphoxide compound, the expansion ratio decreases and the half-life increases.

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Section: Introductionmentioning

confidence: 85%

Impact of low viscosity grade bitumen on foaming characteristics

Kar¹,

Swamy

Tiwari³

et al. 2018

J. S. Afr. Inst. Civ. Eng.

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“…After being numerically calculated, the pressure, density, velocity and density averages are shown in Table 2. To date, foamed bitumen is principally measured according to two main parameters: the expansion ratio (ER), which measures the increase of bitumen in volume after being sprayed, and the half-life (HL), which evaluates the durability and stability of the foamed-state before collapsing [24][25][26]. This paper takes the expansion and half-life as the Grey relation degree reference factors, using HR Yang's experimental data (Table 3) to exchange and analyze.…”

Section: Bitumen Foaming Numerical Simulation and Results Analysismentioning

confidence: 99%

Relation Degree Analysis of Controllable Factors in the Bitumen Foaming Process

Cheng¹,

Wei²,

Zhao³

2016

IJHT

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PREFACEMost highways built early in China are approaching the period of repair or replacement. Road maintenance annually generates up to 160 million tons of waste bitumen pavement material, known as reclaimed asphalt pavement, (RAP) [1]. The practice of not reusing the RAP material in a timely manner will cause significant waste. Reasonable recycling and effective use of waste pavement materials has become a very urgent task. Foamed bitumen which is an environmentally friendly luting cement, is an excellent way to solve this problem [2,3]. Foamed bitumen can be utilized in a variety of construction technologies, such as foamed bitumen recycling construction technology, foamed bitumen warm mixing technology, foamed bitumen cold mixing technology, etc. However, because of various influencing factors of bitumen foaming, controlling the bitumen foaming process is quite complicated. Thus, producing high-quality foamed bitumen is quite difficult. At present, research on bitumen foaming process controlling have mainly focused on the following areas : 1) Determining the test conditions used for obtaining the optimum asphalt foaming effect; 2) exploring the main factors influencing the behavior of bitumen foaming; 3) discussing evaluation index authenticity of foamed bitumen; 4) establishing foamed bitumen recession equation according to different types of bitumen [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. See Table 1 for references. ABSTRACTIn the bitumen foaming process, the controllable factors, especially the water consumption in foaming, heating temperature of bitumen and bitumen viscosity can directly affect the technical performance of foamed bitumen. To improve the technical performance of foamed bitumen and reveal the influence rule of the controllable factors, the bitumen foaming mechanism is analyzed and the control model of the bitumen foaming behavior is established. After numerical calculation with CFD software, relation degree analysis of experimental data and simulation data was performed by utilizing the Grey relation analysis method. The average density inside the cavity flow field is used as the reference factor of theoretical analysis. Then the influence of the controllable factors on the foamed bitumen technical performance is respectively tested. The results show that the bitumen temperature affects the technical performance most significantly, water consumption of foaming secondly, and the least influentional is bitumen viscosity.

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“…Bit B was identified as a bitumen with scarce foaming capacity (acceptable ER and very short H-L) as can be observed in Table 1. More in-depth information concerning bitumens' foaming capacity can be found elsewhere [36].…”

Section: Foamed Bitumens and The Foaming Processmentioning

confidence: 99%