Surfactants And Interfacial Phenomena

https://arpi.unipi.it/bitstream/11568/798598/2/polacco%20798598.pdf

A review of the fundamentals of polymer-modified asphalts: Asphalt/polymer interactions and principles of compatibility

Morphology, rheology, and physical properties of polymer-modified asphalt binders

Molecular dynamics study of oxidative aging effect on asphalt binder properties

http://eprints.um.edu.my/8811/1/Investigation_of_the_possibility_of_using_waste_cooking_oil_as_a_rejuvenating_agent_for_aged_bitumen.pdf

Investigation of the possibility of using waste cooking oil as a rejuvenating agent for aged bitumen

Bitumen aging increases the risk of pavement cracking. A good understanding of this phenomenon is crucial for designing long-lasting pavements. In this context, this paper presents a review of the relevant literature on neat bitumen aging. A broad set of indexes often used to estimate the aging level and end-of-life criteria of bitumen are analyzed and discussed.

A Literature Review of Bitumen Aging: From Laboratory Procedures to Field Evaluation

Transportation is undergoing a radical transformation toward a novel way of thinking about road pavement: a sustainable, multifunctional infrastructure able to satisfy mobility needs, ensuring high safety standards, low carbon impact, automated detection through smart sensors, and resilience against natural and anthropogenic hazards. In this scenario, the road could also play a role for energy harvesting, thanks to the exploitation of solar radiation. The latter can be directly converted into electricity by solar cells placed under a semitransparent layer, or it can be harvested through a calorific flowing fluid. The aim of this paper is to introduce the concept of “hybrid road,” which is able to exploit both approaches. The innovative pavement is a multilayered structure composed by a semitransparent top layer made of glass aggregates bonded together thanks to a semitransparent resin, an electrical layer containing the solar cells, a porous asphalt layer for the circulation of the calorific fluid, and finally, a base waterproof layer. The hybrid road can generate electricity, contrast the heat-island effect, exploit the harvested energy to run a heat pump for heating purposes, or facilitate road deicing during winter. The present paper details experimental data obtained through energetic tests performed with a laboratory-size prototype of the hybrid road. The results show that the prototype is able to harvest around 55.2 W through the heat-transfer fluid. Furthermore, the heat exchange between water and asphalt has a cooling effect on the entire prototype. 

/pdf/thermal-behavior-of-a-novel-solar-hybrid-road-for-energy-259kwdyz.pdf

Thermal Behavior of a Novel Solar Hybrid Road for Energy Harvesting

BioRePavation: innovation in bio-recycling of old asphalt pavements: towards safe cost effective renewable pavement

This paper presents a comparison between two methods to determine low temperature crack performance for asphalt bind- ers: 1) the Bending Beam Rheometer (BBR), which is a rheology-based method, and 2) alternative fracture mechanics-based criteria obtained using a three points bending test (TPBT). The theoretical relation between them was analyzed and tests were simulated using the theory of linear viscoelasticity. Complex modulus data were used to determine Prony series representing materials' mechanical be- havior. Eight different asphalt binders and the materials resulting from their aging process in laboratory were tested. The determination coefficient (R 2 ) between the simulated BBR limit temperatures and the experimental ones was between 0.82 and 0.92. For the TPBT the fracture toughness was determined and a deformation intensity factor was proposed. The fracture criteria could differentiate binder performance. The ranking obtained for the two methods was compared. The rheology-based and the fracture mechanics-based criteria rank asphalt binders differently.

/pdf/low-temperature-specifications-for-asphalt-binders-tests-and-4ovqj7nrf1.pdf

Low temperature specifications for asphalt binders: tests and simulation

Cracking in asphalt mixes is highly influenced by binder properties. Current specifications for low temperature cracking resistance are based on empirical tests or tests involving linear viscoelasticity. Although these standard characteristics may work for conventional binders, they cannot be applied on all asphalts. Using the three points bending test (TPBT) on pre-notched asphalt beams appears to be a solution in that context. This paper presents a comparison between low temperature properties, obtained from Bending Beam Rheometer (BBR), complex modulus, TPBT and Fraass tests. Eight asphalt binders and the resulting ones from aging process were studied. The results showed that BBR and complex modulus give similar information about low temperature binder?s linear viscoelasticity (strongly correlated limiting temperatures obtained using both methods). Fracture and linear viscoelastic properties rank asphalt binders differently, although they may present some correlation. Intermediate coefficients of determination between limiting temperatures obtained using both criteria lead to the conclusion that linear viscoelasticity aspects are not the only variables controlling cracking behaviour. Indeed, they play an important role in crack initiation and growth increasing or decreasing stresses, but they do not determine fracture properties. Other phenomena linked to the microstructure behaviour under high strain are involved in the cracking process.

Emmanuel Chailleux

Papers

A Literature Review of Bitumen Aging: From Laboratory Procedures to Field Evaluation

Thermal Behavior of a Novel Solar Hybrid Road for Energy Harvesting

BioRePavation: innovation in bio-recycling of old asphalt pavements: towards safe cost effective renewable pavement

Low temperature specifications for asphalt binders: tests and simulation

Relationships between low temperatureproperties of asphalt binders