Effects of moisture on strength and permanent deformation of foamed asphalt mix incorporating RAP materials

He, Guiping; Wong, Woon K.

doi:10.1016/j.conbuildmat.2006.06.033

Cited by 53 publications

(17 citation statements)

References 4 publications

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“…Mobil Oil Australia bought the patent rights for bitumen foaming from Csanyi in 1968 and modified his technique by replacing steam with cold water, which marked a beginning for an increased interest in application of CMA [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

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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: Introductionmentioning

confidence: 99%

“…Foamed bitumen is a hot bituminous binder that has been temporarily converted from a liquid state into a foam state by the addition of a small percentage of water and pressurized air [2].…”

Section: Introductionmentioning

confidence: 99%

Application of synthetic wax for improvement of foamed bitumen parameters

Iwański

Chomicz-Kowalska

Maciejewski

2015

Construction and Building Materials

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“…CSS can be used to characterise susceptibility of mixtures to permanent deformation under repeated loads (He and Wong 2008). When CSS is larger, the mixture is less resistant to permanent deformation.…”

Section: Dynamic Creep Testmentioning

confidence: 99%

Comparative evaluation of hot-mix asphalt design methods

Ahmad

Rahman

Hainin

et al. 2012

International Journal of Pavement Engineering

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This study was done to evaluate superior performing asphalt pavements (Superpave) mixture design using local materials in Malaysia. Comparison was also done with the conventional Marshall method-designed mixture conforming to the specifications of the Malaysia Public Works Department (PWD). The experimental plan consisted of a matrix involving one granite aggregate source, two different aggregate gradation and two different asphalt binder types. Local granite aggregates being produced presently were found to conform to the consensus and source aggregate properties criteria of the Superpave mixture design system. Mixture volumetric properties showed that Superpave-designed mixture uses less asphalt binder than the PWD Marshall mixture. Rutting and moisture susceptibility tests showed that Superpave-designed mixtures are more resistant to rutting and moisture damage compared with the PWD mixture. Mixture characterisation tests showed that Superpave mixtures have higher stiffness than the PWD mixture. These indicate that Superpave-designed mixtures are superior to the PWD Marshall-designed mixture.

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“…In road machinery, there are two main bitumen flow methods [13][14][15][16][17].The first, according to the set value of bitumen, it weighs with a load cell, and then makes a onetime injection of the weighed bitumen, which is often used to measure and control bitumen by forcible intermittent mixing stations [9]. The second is by changing the frequency of frequency converters to adjust the bitumen pump driving motor speed, allowing the bitumen flow to be controlled.…”

Section: The Introduction Of Bitumen Flow Control Methodsmentioning

confidence: 99%

“…Cheng Haiying analyzed the design rule of bitumen foaming cores based on bitumen foaming natures [1,6]. Ruckel used the bitumen foaming testing machine to study the most appropriate test conditions for bitumen foaming [6][7][8][9][10]. However, there is still not any relevant reference about the flow control method of foamed bitumen.…”

Section: Introductionmentioning

confidence: 99%

The Flow Control Method of Foamed Bitumen

Cheng¹,

Hu²,

Chen³

2015

IJHT

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Being advantageous for saving energy, protecting the environment and being economical, the foamed bitumen can be widely used in large sized road repairing projects. However, being meta-stable may make it hard to control and measure the flow of foamed bitumen during the foaming process. In order to achieve a stable flow rate of foamed bitumen, this paper proposes that an indirect method should be adopted to control the flow rate of foamed bitumen. Based on the conical annular gap flow adjustment theory, it converts the traditional bitumen sprayer and designs a new flow control method of bitumen, which has been proved by the bitumen flow control test. It can effectively improve the flow control stability of bitumen. The outlet pressure method is used to control the foaming water flow, which has been verified. The method is able to control the foaming water flow in a stable manner. According to what has been researched, setting up the engineering flow control equation of bitumen and foam may prove that when its fitting degree may be over 0.99 and its probability more than 0.05, the control equation is effective.

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Effects of moisture on strength and permanent deformation of foamed asphalt mix incorporating RAP materials

Cited by 53 publications

References 4 publications

Application of synthetic wax for improvement of foamed bitumen parameters

Application of synthetic wax for improvement of foamed bitumen parameters

Comparative evaluation of hot-mix asphalt design methods

The Flow Control Method of Foamed Bitumen

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