Warm Mix Asphalt—A German Case Study

Renken, P; Büchler, Stephan; Falchetto, Augusto Cannone; Wang, Di; Wistuba, Michael P.

doi:10.12783/aapt2018/33821

Cited by 15 publications

(18 citation statements)

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“…20 The second additive was a fatty acid amide (FAA) wax that was produced by Clariant, Germany. 21 These waxes were manufactured synthetically by reacting amines with fatty acids. The third one was a polyethylene (PE) wax produced by the Korea Institute of Construction Technology (KICT), which was an organic additive of a wax-based composition including a crystal controller and synthetic materials.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

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Determining the Sustainable Component of Wax-Based Warm Mix Additives for Improving the Cracking Resistance of Asphalt Binders

Zhang

Ding

et al. 2021

ACS Sustainable Chem. Eng.

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The cracking resistance performance of an asphalt binder is a significant factor affecting the durability of asphalt pavements, and wax-based warm mix additives are devoted to improving the crack resistance of asphalt pavements. However, different components of wax-based warm mix additives (Fischer–Tropsch (F–T)-, fatty acid amide (FAA)-, polyethylene (PE)-, and linear aliphatic hydrocarbon (LAH)-based waxes) have different effects on the cracking resistance performance of the asphalt binder. Therefore, the optimum component of additives was determined by the combination of a microscopic method and a macroscopic test. The average carbon numbers of four additives were determined by a high-temperature gas chromatography (HTGC) test. The multiple stress creep recovery (MSCR), double-edge-notched tension (DENT), and extended bending beam rheological (ExBBR) tests were used to characterize the macroscopic performance of a modified asphalt binder. The F–T wax with long-chain molecules improved the high-temperature performance and lowered the degree of acceleration of thermoreversible aging. The FAA, PE, and LAH waxes with short-chain molecules enhanced the ductile fracture resistance performance. Therefore, the average carbon number as the optimum component of wax-based additives was recommended as C40 to C60.

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Section: ■ Materials and Methodsmentioning

confidence: 99%

“…The first one was a paraffin and long-chain aliphatic hydrocarbon Fischer–Tropsch (F–T) wax that was produced by the Fischer–Tropsch (F–T) process . The second additive was a fatty acid amide (FAA) wax that was produced by Clariant, Germany . These waxes were manufactured synthetically by reacting amines with fatty acids.…”

Section: Methodsmentioning

confidence: 99%

Determining the Sustainable Component of Wax-Based Warm Mix Additives for Improving the Cracking Resistance of Asphalt Binders

Zhang

Ding

et al. 2021

ACS Sustainable Chem. Eng.

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“…The second additive was an FAA wax that was a fatty acid amide wax from the manufacturer Clariant, Germany. These waxes were manufactured synthetically by reacting amines with fatty acids . The third one was a mixture of polyethylene (PE) wax and modified palm (MP) wax produced by the Korea Institute of Construction Technology (KICT) that was an organic additive of a wax-based composition including a crystal controller and synthetic materials .…”

Section: Methodsmentioning

confidence: 99%

Chemical Modification of Waxes to Improve the Compatibility with Asphalt Binders

Zhang

Ding

et al. 2022

ACS Sustainable Chem. Eng.

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Existing wax-based warm mix additives have poor compatibility with asphalt binders, which results in premature wax precipitation and cracking of the asphalt pavement. However, there are few studies on improving the compatibility between the waxes and asphalt. In this study, the wax precipitation temperature (WPT) was recommended as a new suitable evaluation index of the compatibility according to the consistency of changing laws between the solubility parameter distance deduced from Hansen solubility parameter (HSP) experiments and WPT, and a new component of wax-based warm mix additives with better compatibility was also introduced by maleation of the natural waxes. On this basis, the low-temperature cracking resistance of maleated natural waxes was systematically compared with that of unmodified natural waxes and commercial wax-based warm mix additives through dynamic mechanical analysis (DMA), extended bending beam rheometer (Ex-BBR), and double edge notched tension (DENT) tests. The results show that the reactant temperature has the greatest influence on the grafting effect, and the maleated natural waxes with better compatibility can reduce the viscosity, WPT, physical hardening rate, and grade loss and also improve the ductile resistance compared with the unmodified natural waxes and commercial wax-based warm mix additives. The maleation of waxes is a promising method for improving the compatibility of the waxes and asphalt.

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“…The most common additives to produce WMA have been different types of waxes (e.g. amide and Fischer-Tropsch, among others) and viscosity enhancer minerals (like zeolite) (Renken et al, 2018;Topal et al, 2014). Techniques like foamed bitumen also allow a construction at lower temperatures.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the use of a novel chemical bitumen additive with reclaimed asphalt and at lower mix production and construction temperatures: a case study

Gómez

Oeser

2021

Road Materials and Pavement Design

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New regulations on bitumen fumes and aerosols, along with increasing traffic and climatic loads on highways, demand innovative construction materials. In this investigation, a novel isocyanate-based bitumen additive was used to pave 0.5 km of an asphalt binder layer with 50% reclaimed asphalt at 20-30°C below hot mix asphalt (HMA) temperatures, in Germany. During construction, bitumen fumes and aerosols were measured for both reference and modified asphalt mixtures. The reference mixture was paved using a similar mixture but with standard polymer modified bitumen, at standard HMA temperatures. For the investigation, a bitumen 70/100 was modified with 2.0% by wt with this novel isocyanate-based additive in an in-line procedure directly at an asphalt mixing plant without affecting production times. Bitumen and asphalt tests were conducted in the laboratory, on asphalt gathered from the construction site. Due to the temperature reduction, the emissions could be considerably reduced, while maintaining comparable asphalt performance..

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Warm Mix Asphalt—A German Case Study

Cited by 15 publications

References 0 publications

Determining the Sustainable Component of Wax-Based Warm Mix Additives for Improving the Cracking Resistance of Asphalt Binders

Determining the Sustainable Component of Wax-Based Warm Mix Additives for Improving the Cracking Resistance of Asphalt Binders

Chemical Modification of Waxes to Improve the Compatibility with Asphalt Binders

Investigation on the use of a novel chemical bitumen additive with reclaimed asphalt and at lower mix production and construction temperatures: a case study

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