Decay properties of the foamed bitumens

He, Guiping; Wong, Woon K.

doi:10.1016/j.conbuildmat.2005.06.027

Cited by 50 publications

(31 citation statements)

References 2 publications

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“…Bissada [11] and Abel [12] also observed that soft grades of bitumen (with lower viscosities) have better foaming properties, higher expansion ratio and longer half-life (HL) than the hard grades (with higher viscosities), which in turn ensure better dispersion and proper coating of the mineral material. Different behavior in respect to decay parameters of two penetration grades (PG) of bitumen (PG 60, PG 100) was reported by He and Wong [13]. Under the same test conditions (bitumen temperature, air pressure, and water content), higher values of expansion ratio (ER) were obtained for harder binders.…”

Section: Tested Materialsmentioning

confidence: 63%

Application of synthetic wax for improvement of foamed bitumen parameters

Iwański

Chomicz-Kowalska

Maciejewski

2015

Construction and Building Materials

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h i g h l i g h t sWe evaluated a foamed 50/70 pen bitumen modified with Fischer-Tropsch wax. The additive reduced the dynamic viscosity of the binder above 100°C. The foam expansion ratio increased linearly with additive dosage. The foam half-life increased linearly with additive dosage. The foam index increased with the increase of FT wax concentration. a b s t r a c tThe aim of the research was to evaluate the properties of foamed bitumen, produced from a FischerTropsch synthetic wax modified 50/70 penetration grade bitumen for use as a binder in road construction layers. The binders were subjected to conventional tests (including penetration, softening point, Fraass breaking point and dynamic viscosity) as well as bitumen-foam-specific testing (including expansion ratio, half-life and foam index at different foaming water contents). Optimum amounts of foaming water and Fischer-Tropsch wax were identified and the binders were classified as relevant for different low-energy bitumen mix production techniques.

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Section: Tested Materialsmentioning

confidence: 63%

Application of synthetic wax for improvement of foamed bitumen parameters

Iwański

Chomicz-Kowalska

Maciejewski

2015

Construction and Building Materials

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“…Foamed bitumen produced using lower viscosity (soft grades) bitumen have higher values of expansion ratio and half-life than those produced using higher viscosity (hard grades) bitumen (Abel & Hines 1979;Raffaelli 2004). However, He and Wong (2006) reported that the bitumen with higher viscosity gave higher maximum expansion ratio compared to those given by lower viscosity bitumen at the same bitumen temperature, air pressure and water content levels. In the case of halflife values, a reverse trend was observed.…”

Section: Effect Of Bitumen Viscosity On Foam Characteristicsmentioning

confidence: 98%

“…Foamed bitumen with a higher expansion ratio and longer half-life has better dispersion through granular materials, resulting in greater strength improvement (Wahhab et al 2012). With increasing water content and temperature, the expansion ratio is expected to increase with a simultaneous decrease in the half-life (Bowering & Martin 1976;Brennen et al 1983;He & Wong 2006). This can be attributed to more water availability, and subsequent steam generation.…”

Section: Factors Affecting Foamed Bitumen Characteristicsmentioning

confidence: 99%

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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“…Both low energy consumption and environmental side-effect-free paving technologies, which involve the mixing of mineral aggregates with a bitumen emulsion or foamed bitumen, have emerged over the last decades. Cold in-place recycling, which has become an economical and sustainable paving practice, has been extensively used in the rehabilitation of pavements in many countries throughout the world (He and Wong 2006;Jenkins et al 2000). Emulsification and foaming are competitive technologies in the asphalt pavement industry.…”

Section: Bitumen Foaming and Future Trendsmentioning

confidence: 99%