Comparison of methods for measuring zero shear viscosity in asphalts

Morea, Francisco; Agnusdei, J O; Zerbino, Raúl Luis

doi:10.1617/s11527-009-9506-y

Cited by 75 publications

(42 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Since then, this has been a controversial matter of debate, as some authors [30,31] have claimed others parameters (like zero-shear-viscosity, ZSV) to be more adequate in predicting the resistance of bitumen to permanent deformation at high in-service temperatures. Nevertheless, if compared to the time-consuming method of the ZSV determination at several temperatures, the testing procedure presented in Figure 4 for MDI-CO modified binders stands for an easier way to establish a comparative analysis on the degree of improvement attained.…”

Section: In-service Performance Of the Modified Bitumensmentioning

confidence: 99%

Processing of bitumens modified by a bio-oil-derived polyurethane

Cuadri¹,

García‐Morales²,

Navarro³

et al. 2014

Fuel

View full text Add to dashboard Cite

Castor oil (CO) functionalized by isocyanate groups (-NCO) is proposed as a novel bio-based reactive polyurethane (PU) for bitumen modification. This work presents a comparative analysis conducted on blends of bitumen and 2 wt.% of a PU prepolymer prepared by NCO-functionalization of castor oil. Four preparation procedures were evaluated, which resulted from the combination of two processing times (1h or 24h, at 90ºC) followed by two different post-treatments (water addition or ambient curing for up to 6 months). It was found that the degree of modification attained after posttreatment depends on the previous processing conditions. Thus, short processing times are required if the binder is further subjected to ambient curing. Instead, the success of the water-addition modification falls on a previous long processing step. As revealed by rheological tests, ambient curing was seen to be by far a more efficient way of modification if compared to direct addition of water, and makes clear that the resulting binder evolves towards a better performance when in service. In that sense, Thin Layer Chromatography tests, Modulated DSC and AFM images demonstrated a more complex microstructure characterized by the presence of a larger content of molecules with higher polarity, size and molecular weight.

show abstract

Section: In-service Performance Of the Modified Bitumensmentioning

confidence: 99%

Processing of bitumens modified by a bio-oil-derived polyurethane

Cuadri¹,

García‐Morales²,

Navarro³

et al. 2014

Fuel

View full text Add to dashboard Cite

show abstract

“…(10) [9,13]. Higher ZSV value indicates asphalt binder with better rut resistant property and vice versa.…”

Section: Zero Shear Viscosity (Zsv)mentioning

confidence: 99%

“…The G*/sinδ showed satisfactory results for unmodified binders [6][7][8]. However, this parameter showed unconvincing trend for polymer modified binders due to its inability to capture delayed elastic recovery [6,[9][10][11][12][13][14]. Thus, applicability of G*/sinδ parameter for modified binders needs to be investigated thoroughly.…”

Section: Introductionmentioning

confidence: 99%

“…The ZSV indicates asphalt binder's viscosity corresponds to zero shear rate, i.e., approximately at very low shear rate [11,13,19]. Good correlation has been observed between the ZSV parameter and rutting of mixture containing different binders including polymer modified binders [4,13,[19][20][21]. Measurement of ZSV test takes significant time to capture steady state of a binder.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Comparison of different rheological parameters for rutting susceptibility of SBS + WMA modified binders

Singh

Kataware

2016

Innov. Infrastruct. Solut.

View full text Add to dashboard Cite

show abstract

“…This parameter was established by the Strategic Highway Research Program (SHRP) [20] in order to determine the binder's average seven-day maximum pavement design temperature (according to AASHTO M320, and by application of AASHTO T315). In our case, the actual aim was to present the results in such a way that the rutting resistance of the different samples at high in-service temperatures can be quantitatively compared [21].…”

Section: Rheological Behaviourmentioning

confidence: 99%

Valorization of phosphogypsum waste as asphaltic bitumen modifier

Cuadri

Navarro

García‐Morales

et al. 2014

Journal of Hazardous Materials

116

View full text Add to dashboard Cite

The accumulation of phosphogypsum wastes from the fertilizer industries, which remain in regulated stacks occupying considerable land resources, is causing significant environment problems worldwide. In that sense, the scientific community is being pressured to find alternative ways for their disposal. In this research, we propose a novel application for phosphogypsum wastes, as a modifier of bitumen for flexible road pavements. Viscous flow tests carried out on bitumen modified with a phosphogypsum waste and doped with sulfuric acid demonstrated an extraordinary increase in viscosity, at 60 ºC, when compared to a counterpart sample which had been modified with gypsum, the main component of phosphogypsum. Similarly, a significant improvement in the viscoelastic response of the resulting material at high temperatures was also found. FTIR (Fourier transform infrared spectroscopy) scans provided evidences of the existence of chemical reactions involving phosphorus, as revealed by a new absorption band from 1060 to 1180 cm -1 , related to C−O−P vibrations. This result points at phosphorus contained in the phosphogypsum impurities to be the actual "modifying" substance. Furthermore, no C-O-P band was observed in the absence of sulfuric acid, which seems to be the "promoting" agent of this type of bond.

show abstract

Comparison of methods for measuring zero shear viscosity in asphalts

Cited by 75 publications

References 8 publications

Processing of bitumens modified by a bio-oil-derived polyurethane

Processing of bitumens modified by a bio-oil-derived polyurethane

Comparison of different rheological parameters for rutting susceptibility of SBS + WMA modified binders

Valorization of phosphogypsum waste as asphaltic bitumen modifier

Contact Info

Product

Resources

About