New experimental methods for characterizing formation and decay of foam bitumen

Hailesilassie, Biruk W.; Hugener, Martin; Bieder, Andrea; Partl, Manfred N.

doi:10.1617/s11527-015-0659-6

Cited by 11 publications

(5 citation statements)

References 18 publications

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“…Así lo han reconocido diferentes investigadores, quienes usando métodos analíticos (p. ej., la ley de Stokes) y herramientas tecnológicas, como rayos X, calorimetría de barrido diferencial, microscopios de baja potencia y principalmente cámaras de video, han medido la BSD y su variación en el tiempo, y evaluado el efecto de factores como el tipo de asfalto, la temperatura, la FWC y los aditivos sobre esta propiedad y, por consiguiente, sobre la calidad de la espuma [7,[14][15][16][17][18][19][20].…”

Section: Distribución Del Tamaño De Burbujasunclassified

“…Las conclusiones de algunos estudios muestran que a mayor temperatura aumenta el tamaño de las burbujas y que la morfología de su formación depende más del tipo de cemento asfáltico que de la temperatura [17][18], que a bajas FWC se obtienen burbujas de menor diámetro [19] y que una porción significativa de las burbujas que contribuyen a la expansión del asfalto tienen diámetros aproximados del orden de 1 mm [20]. En la figura 3, se muestra una manera de representación de las curvas de distribución de tamaño de burbujas.…”

Section: Distribución Del Tamaño De Burbujasunclassified

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Técnicas para caracterización de espumas de asfalto

Campagnoli-Martínez

Estupiñán-Escalante

Soto-Vargas

2019

Cien.Ing.Neogranadina

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En la estabilización de suelos y en el reciclaje de pavimentos, se ha considerado que larelación de expansión y la vida media defnen relativamente bien la calidad de las espumas de asfalto.Sin embargo, al aplicar la tecnología de los asfaltos espumados a la fabricación de mezclas tibias,se ha visto que estas propiedades no resultan sufcientes para caracterizar la espuma y asegurarel cubrimiento completo de los agregados por el asfalto, una adecuada trabajabilidad y facilidad decompactación de la mezcla, así como un comportamiento apropiado de la mezcla en servicio. Estehecho ha motivado estudios concluyentes en la necesidad de establecer, además de la relación deexpansión y de la vida media, la curva de colapso y la distribución de tamaños de las burbujas en unaespuma de asfalto. Varios de estos estudios también recomiendan técnicas más seguras y confablespara la medida de las propiedades de la espuma. En este artículo, se resumen las técnicas que seestán explorando en los laboratorios de la Escuela Colombiana de Ingeniería Julio Garavito para caracterizar espumas de asfalto fabricadas en planta de laboratorio WLB-10S. Tales técnicas incluyenmedidas invasivas como la varilla graduada y el ensayo de colapso de la espuma de asfalto y no invasivas como el procesamiento de imágenes y el uso sensores infrarrojos. También, para mostrar el potencial de cada técnica, se presentan algunos resultados de las medidas obtenidas con su aplicación.

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Section: Distribución Del Tamaño De Burbujasunclassified

Técnicas para caracterización de espumas de asfalto

Campagnoli-Martínez

Estupiñán-Escalante

Soto-Vargas

2019

Cien.Ing.Neogranadina

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“…increase of expansion ratio and half-life. The effects of binder chemical composition on foaming using Fourier transform infrared spectroscopy and X-Ray radiography techniques have been investigated by various authors (Namutebi et al 2011; Hailesilassie et al 2015). Lesueur et al (2004) reported that bitumen composition did not influence foaming properties much.…”

Section: Effect Of Bitumen Chemical Composition On Foam Characteristicsmentioning

confidence: 99%

“…The foaming effects on binder chemical composition using Fourier transform infrared spectroscopy and X-Ray radiography techniques have been investigated by various authors (Namutebi et al 2011; Hailesilassie et al 2015), but the effect of binder structure on foaming has not been studied yet. Figure 12 shows the sulphoxide, carbonyl, aromatics and aliphatic …”

Section: Effect Of Chemical Composition On Foaming Characteristicsmentioning

confidence: 99%

Impact of low viscosity grade bitumen on foaming characteristics

Kar¹,

Swamy

Tiwari³

et al. 2018

J. S. Afr. Inst. Civ. Eng.

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The construction of highway infrastructure requires large quantities of construction materials and is an energy-intensive activity. Issues like scarcity of construction materials, increasing cost of materials, increasing cost of construction processes, and the emphasis on less polluting construction procedures have led to advancements in pavement construction practices. One such example is foamed bitumen technology. In this process, cold water is injected into a hot bitumen medium, which leads to drastic expansion of bitumen, forming a fine mist or foam. The performance of foam bitumen mixtures is influenced by the bitumen properties, as well as by the foaming process. This paper deals with research on the rheology of three different types of binders having low viscosity (in the range of 500 to 3 000 Poise at 60°C) on foaming characteristics. The water content and temperature also have significant effects on foam decay and the expansion ratio of foam. Results show that a low viscosity bitumen consumes less energy during the foam process compared to high viscosity bitumen. The conclusion drawn from this study is that the expansion ratio and half-life of foam bitumen depend on the rheology of the bitumen, as well as on the chemical composition of the bitumen. It was concluded that, with an increase in carbonyl and sulphoxide compound, the expansion ratio decreases and the half-life increases.

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“…The principle of the WMA technique is to reduce the bitumen viscosity during mixing and compaction processes by adding appropriate additives [16]. These additives can be briefly divided into three categories: bitumen foaming, organic additives, and chemical additives [17,18]. However, there are still some disadvantages when using the chemical additives individually.…”

Section: Introductionmentioning

confidence: 99%

Effects of Composite Warm Mix Additive (CAR) on the Physical and Rheological Performance of Bitumen and the Pavement Performance of Its Concrete

Zhang

Sun

et al. 2019

Materials

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Warm mix asphalt received increasing attention in recent years, and this technology aims to increase the fluidity of bitumen in the process of mixing and construction. To characterize the physical and rheological properties of bitumen and the pavement performance of bituminous mixtures, it was modified by a composite additive Rediset. Rediset consists of both the cationic surfactants and organic additive-based rheology modifiers. Commonly used materials such as Pen 60/80 bitumen and bituminous concrete (AC-20) were selected. The results show that Rediset can improve the penetration and softening point of the bitumen, making the bitumen stiffer and harder. All Rediset-modified bituminous concretes are in the same low-temperature performance grade (PG) as the bitumen without Rediset. Although Rediset can decrease the rutting and crack resistance of Rediset-modified bituminous concrete, all the Rediset-modified bituminous concrete with less than 2% Rediset still satisfied the requirement of the maximum bending strain being higher than 2000 με, and the dynamic stability of Rediset-modified bituminous concrete with 3% Rediset was still higher than 1000 cycles/mm. The cationic surfactants in the Rediset can play the role of an anti-stripping agent and improve the adhesion between the interfaces of the aggregate and bituminous binder, which enhances the moisture resistance of Rediset-modified bituminous concrete.

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New experimental methods for characterizing formation and decay of foam bitumen

Cited by 11 publications

References 18 publications

Técnicas para caracterización de espumas de asfalto

Técnicas para caracterización de espumas de asfalto

Impact of low viscosity grade bitumen on foaming characteristics

Effects of Composite Warm Mix Additive (CAR) on the Physical and Rheological Performance of Bitumen and the Pavement Performance of Its Concrete

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