Rheological effects on bitumen of polyphosphoric acid (PPA) addition

Baldino, Noemi; Gabriele, Domenico; Lupi, Francesca R.; Rossi, Cesare Oliviero; Caputo, Paolino; Falvo, Thomas

doi:10.1016/j.conbuildmat.2012.11.001

Cited by 87 publications

(47 citation statements)

References 15 publications

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“…Three systems out of four, namely, neat bitumen and bitumens modified with P2KA and LCS, share a similar z variability in the narrow range 1.12-1.22, confirming the presence of interacting asphaltenes that form lightly entangled networks. On the contrary, PPA shows a slightly higher flow coordination number, especially in the range 5-10 • C/min, evidencing its network-promoting effect, according to previous investigations [39,40]. In any case, the calculated z values indicate that the coordination numbers are slightly affected by the thermal history as evidenced by the upper plot in Figure 3.…”

Section: Oscillatory Shear Experimentsmentioning

confidence: 58%

Mechanical Resilience of Modified Bitumen at Different Cooling Rates: A Rheological and Atomic Force Microscopy Investigation

et al. 2017

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Due to the wide variation in geographic and climatic conditions, the search for high-performance bituminous materials is becoming more and more urgent to increase the useful life of pavements and reduce the enormous cost of road maintenance. Extensive research has been done by testing various bitumen modifiers, although most of them are petroleum-derived additives, such as polymers, rubbers and plastic, which in turn do not prevent oxidative aging of the binder. Thus, as an alternative to the most common polymeric rheological modifiers, selected binder additives falling in the categories of organosilane (P2KA), polyphosphoric acid (PPA) and food grade phospholipids (LCS) were homogeneously mixed to a base bitumen. The goal was to analyse the micro-morphology of the bitumens (neat and modified) subjected to different cooling rates and to find the corresponding correlations in the mechanical response domain. Therefore, microstructural investigations carried out by Atomic Force Microscopy (AFM) and fundamental rheological tests based on oscillatory dynamic rheology, were used to evaluate the effect of additives on the bitumen structure and compared with pristine binder as a reference. The tested bitumen additives have been shown to elicit different mechanical behaviours by varying the cooling rate. By comparing rheological data, analysed in the framework of the "weak gel" model, and AFM images, it was found that both P2KA and PPA altered the material structure in a different manner whereas LCS revealed superior performances, acting as "mechanical buffer" in the whole explored range of cooling rates.

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Section: Oscillatory Shear Experimentsmentioning

confidence: 58%

Mechanical Resilience of Modified Bitumen at Different Cooling Rates: A Rheological and Atomic Force Microscopy Investigation

et al. 2017

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“…It can be observed that the g ⁄ of asphalt measured at temperature of 0°C is higher than corresponding g ⁄ measured at temperature of 10°C. Complex viscosity for all asphalt binders gradually decrease with the enhanced rate of loading due to the shear thinning behavior of viscoelastic asphalt [30].…”

Section: Rutting Factor (G ⁄ /Sin D) and Rutting Resistancementioning

confidence: 96%

Effect of ultraviolet aging on rheological properties of organic intercalated layered double hydroxides modified asphalt

Zhang

et al. 2015

Construction and Building Materials

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“…For example, PPA added to bitumen in a few wt. % is responsible for a stiffening effect due to several chemical mechanisms detailed in [44,47,48], which overall would promote an increase of the effective volume of asphaltenes, thus enhancing the rigidity of bitumen. The hardening effect played by PPA has also been compared to bitumen containing different commercial types of waxes [49].…”

Section: Appl Sci 2017 7 524 5 Of 10mentioning

confidence: 99%

Adhesion Promoters in Bituminous Road Materials: A Review

Rossi

Teltayev²,

Angelico

2017

Applied Sciences

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Featured Application:The adhesion between aggregate and bitumen is crucial in asphalt pavements and has a strong influence on the service time of the road. Thus, the addition of adhesion promoters is gaining importance, particularly with regard to emerging and more sustainable technologies for asphalt production, which aim to reduce the working temperature, save energy, and guarantee the safety of specialized personnel. The present work offers an overview on physical and chemical properties of most common types of adhesion promoters currently used in asphalt industry and tries to build a bridge between scientific research and technological application.Abstract: This review focuses on certain classes of organic compounds known variously in the specific literature of asphalt as adhesion promoters, antistripping agents, wetting agents, antistrips, or adhesion agents. These kinds of organic additives are currently formulated to enhance the bitumen coating of mineral aggregates and improve the workability of asphalt mixtures. In this review, the term "adhesion promoters" includes both synthetic organic compounds as well as those extracted from natural resources, mixed in trace amounts to bitumen. Their main role is to alter the interfacial energy, so that the presence of water, even in trace, does not weaken the bitumen-aggregate bond and tends to favor adhesion. The report also considers the chemical functionalities that play a predominant role in bonding, as well as the effects of surface modification of the aggregate due to the presence of adhesion promoters in pre-blended bituminous mixtures. Although bitumen is widely used in road pavement construction and the discussion is mainly addressed to the improvement of adhesion in road materials, adhesion and wetting properties can also represent a general issue in various bitumen-based industrial products.

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Rheological effects on bitumen of polyphosphoric acid (PPA) addition

Cited by 87 publications

References 15 publications

Mechanical Resilience of Modified Bitumen at Different Cooling Rates: A Rheological and Atomic Force Microscopy Investigation

Mechanical Resilience of Modified Bitumen at Different Cooling Rates: A Rheological and Atomic Force Microscopy Investigation

Effect of ultraviolet aging on rheological properties of organic intercalated layered double hydroxides modified asphalt

Adhesion Promoters in Bituminous Road Materials: A Review

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