Assessing temperature reduction potential of various additives on binder and asphalt mix level for mastic asphalt

Hofko, Bernhard; Dimitrov, M; Hospodka, Markus

doi:10.1201/b18538-73

Cited by 3 publications

(2 citation statements)

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“…A realistic share of waxes was observed to be up to 2-4% of the bitumen. Amid wax (AW) was found to have favorable behavior as MA additive (Hofko et al 2015).…”

Section: Characteristics Of Mastic Asphalt and Modificationsmentioning

confidence: 99%

Evaluation of Environmental Performance and Life Cycle Costs of Construction Materials: The Case of Alternative Mastic Asphalt Mixes

Schwab¹,

Rechberger²,

Hofko³

2016

Sustainable Construction Materials and Technologies (SCMT)

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A procedure for environmental and economic evaluation of construction materials is presented. The selection of appropriate construction materials depends on their technical suitability in particular engineered infrastructures, but also on environmental and economic considerations. The latter can be evaluated in a freely available software, combining principles of Material Flow Analysis (MFA), Life Cycle Energy Analysis (LCEA) and Life Cycle Costing (LCC). With the proposed procedure, different construction options can be compared and an optimal option can be selected. The evaluation procedure is illustrated in a case of mastic asphalt (MA) road surface layers. The production temperature of MA can be reduced my material modifications (application of additives and varying aggregate geometries). Temperature reduction induces changes in material demand, energy demand and costs on various stages of the life cycle. A reference MA is compared to two modified, temperature-reduced mixes with similar mechanical characteristics. The results indicate that the application of a binder additive is controversial and that the complete or partial substitution of crushed aggregates by round aggregates is promising. In either case, reduction of mixing temperature results in reduction of particulate emissions and decreased energy demand. The presented evaluation procedure helps to identify cost-effective, energy-saving and low-emission MA options.

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“…A realistic share of waxes was observed to be up to 2-4% of the bitumen. Amid wax (AW) was found to have favorable behavior as MA additive (Hofko et al 2015).…”

Section: Characteristics Of Mastic Asphalt and Modificationsmentioning

confidence: 99%

Evaluation of Environmental Performance and Life Cycle Costs of Construction Materials: The Case of Alternative Mastic Asphalt Mixes

Schwab¹,

Rechberger²,

Hofko³

2016

Sustainable Construction Materials and Technologies (SCMT)

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“…Rough and tough aggregates provide better polishing resistance. Therefore, the polishing characteristics of aggregates should be evaluated with laboratory tests before choosing them for pavement wearing courses (Bessa et al 2014;Hofko et al 2012). Natural aggregates have different physical and mechanical characteristics due to their formation processes.…”

Section: Introductionmentioning

confidence: 99%

Site Assessment of Surface Texture and Skid Resistance by Varying the Grit Parameters of an SMA

Gökalp

Saltan

et al. 2022

J. Transp. Eng., Part B: Pavements

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For the safe operation of vehicles, pavement should provide adequate skid resistance, which can be achieved by using high polishing-resistant aggregate in wearing courses. However, supplying high-quality aggregate is not always feasible due to high transportation costs. For this reason, a method called gritting was adapted to meet the Highway Technical Specification (HTS) of Turkey in 2013. According to the method, for certain parts of the country, the wearing course can be constructed with local aggregates that have minimum polished stone value (PSV) of 40 (PSV ≥ 40), but, in this case, the surface must be covered with a high polishing-resistant aggregate (PSV ≥ 50), after the rollers' first pass. The objective of this study was to improve the present gritting method by investigating the effect of grit parameters on pavement performance under real traffic conditions. In this regard, during its construction, the wearing course of O-51 Highway was gritted with different aggregate types (slags and natural), sizes (1-3; 1-5 mm), spreading amount (1.5; 2; 2.5 kg=m 2 ), and spreading time (before and after the first pass of a roller) on eight test sections. Then, the macrotexture and skid resistance performance of these sections were evaluated under real traffic and environmental conditions for longer than 4 years. Changes in surface texture and skid resistance with respect to traffic were determined for each section. The results showed that higher skid resistance values were obtained at the sections gritted with metallurgical slags. Additionally, the sections gritted with 1-5 mm aggregates had better skid resistance than those gritted with 1-3 mm, while the change in mean texture depths were not very significant.

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Technological and environmental performance of temperature-reduced mastic asphalt mixtures

Hofko

Dimitrov

Schwab

et al. 2016

Road Materials and Pavement Design

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Assessing temperature reduction potential of various additives on binder and asphalt mix level for mastic asphalt

Cited by 3 publications

References 0 publications

Evaluation of Environmental Performance and Life Cycle Costs of Construction Materials: The Case of Alternative Mastic Asphalt Mixes

Evaluation of Environmental Performance and Life Cycle Costs of Construction Materials: The Case of Alternative Mastic Asphalt Mixes

Site Assessment of Surface Texture and Skid Resistance by Varying the Grit Parameters of an SMA

Technological and environmental performance of temperature-reduced mastic asphalt mixtures

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