Early-age strength and long-term performance of asphalt emulsion cold recycled mixes with various cement contents

Yan, Jinhai; Leng, Zhen; Li, Feng; Zhu, Hehua; Bao, Shihui

doi:10.1016/j.conbuildmat.2017.01.114

Cited by 64 publications

(27 citation statements)

References 15 publications

(14 reference statements)

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“…Hence not only the regenerating components refreshing the aged binder is important, but the penetrative properties in the aged binder should be a point guaranteed [36]. Therefore, WCO was used as the regenerating components supplier, while emulsifier and penetrants were added to enhance the diffusivity and permeability [37,38]. First, a colloid mill (MIDE, Jiaxing, China) was used to prepare emulsified asphalt.…”

Section: Preparation Of Rejuvenators and Samplesmentioning

confidence: 99%

Diffusion Mechanism of Rejuvenator and Its Effects on the Physical and Rheological Performance of Aged Asphalt Binder

et al. 2019

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Using rejuvenator to improve the asphalt pavement service state has become an increasing concern in recent years. This study mainly focuses on the diffusion analysis between rejuvenator and aged asphalt, and further rheological influences by addition of rejuvenators. First, two rejuvenators, oil rejuvenator (OR) and penetrative rejuvenator (PR), were prepared in the laboratory. Afterward, the diffused performance of rejuvenators was investigated by viscosity, contact angle, and three self-designed feasible test indexes, which were sinking time test, softening rate test, and gravitational collapsing test. Beside the comparison in physical properties tests of aged and rejuvenated asphalt, their rheological performances were also evaluated by dynamic shear rheometer (DSR) and bending beam rheometer (BBR) respectively. The results indicated that three proposed indexes can comparatively analyze the diffusion rate of different rejuvenators on aged asphalt effectively. Furthermore, all adopted test indexes signaled that PR has a faster diffusion rate and better penetrative efficiency. Comparatively, exceeding rejuvenator dosage would increase the rutting possibility. Nevertheless, 2.5 wt% addition dosage for both OR and PR into aged asphalt can promote appropriate improvement in physical properties and crack resistance. The study would supply a significant reference for penetrative rejuvenator preparation and its diffusing evaluation.

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Section: Preparation Of Rejuvenators and Samplesmentioning

confidence: 99%

Diffusion Mechanism of Rejuvenator and Its Effects on the Physical and Rheological Performance of Aged Asphalt Binder

et al. 2019

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“…Normally, mechanical properties of CRME increase with the increase of curing time and cement content [25]. However, CRME could have a more brittle behavior under low temperature conditions when the content of cement surpasses a specific limit [26]. The fatigue behavior of CRME with cement has been evaluated based on an indirect tensile fatigue test.…”

Section: Introductionmentioning

confidence: 99%

Performance and Microstructure of Cold Recycled Mixes Using Asphalt Emulsion with Different Contents of Cement

Yang

Qian

2019

Materials

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Cold recycled mixes using asphalt emulsion (CRME) is an economical and environmentally-friendly technology for asphalt pavement maintenance and rehabilitation. In order to determine the optimum range of cement contents, the complex interaction between cement and asphalt emulsion and the effects of cement on performance of CRME were investigated with different contents of cement. The microstructure and chemical composition of the fracture surface of CRME with different contents of cement were analyzed in this paper as well. Results show that the high-temperature stability and moisture susceptibility of CRME increased with the contents of cement increasing. The low-temperature crack resistance ability gradually increased when the content of cement is increased from 0% to 1.5%. However, it gradually decreased when the content of cement is increased from 1.5% to 4%. Cold recycled mixes had better low-temperature cracking resistance when the contents of cement were in the range from 1% to 2%. The results of microstructure and energy spectrum analysis show that the composite structure is formed by hydration products and asphalt emulsion. The study will be significant to better know the effects of cement and promote the development of CRME.

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“…Effects of additives on the mechanical performance in recycled mixtures with bitumen emulsion can be found in [8]. Active fillers including cement and lime are the commonly used additives instead of conventional stone fillers [9,10]. Furthermore, polymer modified bitumen emulsion is another effective solution, which can provide many advantages including enhanced setting, higher early strength, improved cohesion and better adhesion [11,12].…”

Section: Introductionmentioning

confidence: 99%

Influence of Different Modifiers on Bonding Strength and Rheological Performance of Bitumen Emulsion

Pan

Liang

et al. 2019

Materials

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Styrene butadiene rubber latex (SBR), waterborne epoxy adhesive (WE) and colloidal silica sol (SiO2) were used to prepare modified bitumen emulsion for cold mix asphalt. The modification effects of the individual modifiers and the combination of these modifiers were investigated by using bonding strength and dynamic shear rheological property. Test results showed that the modifier dosage helped to balance the performance of modified bitumen emulsion by improving its bonding strength without compromising its rheological properties. The critical dosage at which the peak bonding strength occurred was 4%, 12% and 4% for SBR, WE and SiO2 respectively. Improved rheological performance on the master curves was well distinguished, in particular, by increased complex modulus and reduced phase angle at the low frequency region. Abrupt changes, especially on phase angle occurred when the modifier dosage was beyond 12%. The measured ratio between bonding strength and complex shear modulus could vary ranging from 10−2 to 102. Highly-modified bitumen emulsion with good adhesion, rheology and compatibility can be prepared by using the combination of SBR, WE and SiO2. It is important to carefully select the type and dosage of modifier for a particular combination to optimize the performance of modified bitumen emulsion.

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Early-age strength and long-term performance of asphalt emulsion cold recycled mixes with various cement contents

Cited by 64 publications

References 15 publications

Diffusion Mechanism of Rejuvenator and Its Effects on the Physical and Rheological Performance of Aged Asphalt Binder

Diffusion Mechanism of Rejuvenator and Its Effects on the Physical and Rheological Performance of Aged Asphalt Binder

Performance and Microstructure of Cold Recycled Mixes Using Asphalt Emulsion with Different Contents of Cement

Influence of Different Modifiers on Bonding Strength and Rheological Performance of Bitumen Emulsion

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