Laboratory study on permanent deformation of foamed asphalt mix incorporating reclaimed asphalt pavement materials

He, Guiping; Wong, Woon K.

doi:10.1016/j.conbuildmat.2006.05.024

Cited by 57 publications

(20 citation statements)

References 3 publications

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“…The cycles number is shown in Figure 7 at which the cycles start from the first stage to the transition point and this point is determined based on the slope of curve where the accumulated strain has same rate as well as linear with time, which is different from the primary stage. Moreover, the transition point deviated further from the initial axial strain, which negatively affect the results of stiffness dynamic creep due to the densification [33][34][35][36]. As can be observed in Figure 7, number cycles of the mixtures at the primary stage are approximately similar to each other with slight differences at the mixtures, which reinforced with fibers.…”

Section: Creep Strain Slope (Css) and Secant Creep Stiffness Modulus mentioning

confidence: 48%

Mechanistic Approach for Reducing the Thickness of Asphalt Layer Incorporating Steel Slag Aggregate

Alnadish

Aman

2018

CivileJournal

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This study aimed to evaluate the possibility of reducing the thickness of asphalt layer as a novel solution for the high density of asphalt layer incorporated with steel slag aggregate, which increase the cost of transportation. MechanisticEmpirical Pavement Design (MEPDG) approach was employed to evaluate the benefits of introducing polyvinyl alcohol fiber in terms of reducing the thickness of asphalt layer as well as the extension service life of asphalt layer. On the other hand, the correlation between creep strain slope (CSS) and secant creep stiffness modulus (SCSM) were assessed to provide a better evaluation and understanding concerning of the outputs of the dynamic creep test. The findings of this study showed that introducing polyvinyl alcohol fiber into the mixtures at the optimum content (0.5 kg/ton) have reduced the thickness of asphalt layer by approximately 10%. Additionally, polyvinyl alcohol fiber has increased the performance of the asphalt mixtures concerning of resilient modulus and dynamic creep. Furthermore, the correlation between CSS and SCSM was strong, which indicates that evaluation of permanent deformation using CSS and SCSM parameters provides better actual assessment than accumulation strain.

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Section: Creep Strain Slope (Css) and Secant Creep Stiffness Modulus mentioning

confidence: 48%

Mechanistic Approach for Reducing the Thickness of Asphalt Layer Incorporating Steel Slag Aggregate

Alnadish

Aman

2018

CivileJournal

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“…The rutting of asphalt pavements is also regarded as the main problem of flexible pavements [3]. In severe cases, permanent deformation gradually occurs through small distortions caused by repeated shear deformations under applied wheel loads; rutting or permanent deformation may be attributed to the plastic properties of an asphalt mixture under repeated loading; however, this phenomenon is unlikely related to the elastic properties of asphalt mixture [4]. Furthermore, rutting may be caused by mechanical deformation.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Permanent Deformations and Aging Conditions of Batu Pahat Soft Clay-Modified Asphalt Mixture by Using a Dynamic Creep Test

Allam

Masirin

Abdullah

et al. 2016

MATEC Web of Conferences

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Abstract. This study aimed to evaluate the permanent deformation and aging conditions of BatuPahat soft clay-modified asphalt mixture, also called BatuPahat soft clay (BPSC) particles; these particles are used in powder form as an additive to hot-mix asphalt mixture. In this experiment, five percentage compositions of BPSC (0%, 2%, 4%, 6%, and 8%) by weight of bitumen were used. A novel design was established to modify the hot-mix asphalt by using the Superpave method for each additive ratio. Several laboratory tests evaluating different properties, such as indirect tensile strength, resilient stiffness modulus, and dynamic creep, was conducted to assess the performance of the samples mixed through the Superpave method. In the resilient modulus test, fatigue and rutting resistance were reduced by the BPSC particles. The added BPSC particles increased the indirect tensile strength. Among the mixtures, 4% BPSC particles yielded the highest performance. In the dynamic creep test, 4% BPSC particles added to the unaged and short-term aged specimens also showed the highest performance. Based on these results, our conclusion is that the BPSC particles can alleviate the permanent deformation (rutting) of roads.

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“…In the chamber pressure, the tenuous foamed bitumen is forced out of the foam chamber, while in atmospheric pressure the tenuous foamed bitumen has pressure differences inside and outside where its internal pressure is much higher than its external pressure. The rapid expansion of the inner gas of the tenuous foamed bitumen forms a meta-stable foamed bitumen [3][4][5][6][7][8] . In the course of mixing, the foamed bitumen creates gas.…”

Section: Bitumen Foaming Process Descriptionmentioning

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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Laboratory study on permanent deformation of foamed asphalt mix incorporating reclaimed asphalt pavement materials

Cited by 57 publications

References 3 publications

Mechanistic Approach for Reducing the Thickness of Asphalt Layer Incorporating Steel Slag Aggregate

Mechanistic Approach for Reducing the Thickness of Asphalt Layer Incorporating Steel Slag Aggregate

Evaluation of the Permanent Deformations and Aging Conditions of Batu Pahat Soft Clay-Modified Asphalt Mixture by Using a Dynamic Creep Test

The Flow Control Method of Foamed Bitumen

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