Papers by Author: Xiang Li Kong

Abstract: Nano calcium carbonate/polymer composite coatings were prepared and their anti-icing property was investigated. The anti-icing capability of the composites depends not only on their superhydrophobicity but also on the surface morphology. The result opens up possibilities for rational design of anti-icing coatings by tuning surface textures in multiple scales and provides a comprehensive framework for optimazing nanoparticle/polymer composite for a wide range of applications.

Abstract: To provide the valuable references for pavement materials applied in various climatic zones, a series of asphalts paving mixtures including common asphalt mixture, SBS modified asphalt mixture and nano-montmorillonite (NMMT)/SBS composite modified asphalt mixture were designed. Marshall tests were carried out to evaluate the effect of different modifiers on the property of these asphalt paving mixtures. Compared with the other two mixtures, NMMT/SBS composite modified asphalt shows fine mechanical performance and moisture susceptibility. These results indicate that NMMT/SBS as a composite modifier can result in excellent properties for asphalt paving mixture.

Abstract: Nano-montmorillonite (Nano-MMT)/SBS composite modified asphalts were prepared by melt blending, the aging property of which was detected by rolling thin film oven test (RTFOT) method. The microstructure of Nano-MMT/SBS modified asphalts was characterized by X-ray diffraction (XRD). The results demonstrated that nano-composite structures formed by the intercalation effect of SBS and asphalt into the MMT lamellae, which led to improvement in terms of toughness, strength, and thermal stability. In comparison with SBS modified asphalt, Nano-MMT impact on the properties of the modified asphalt appeared as a decreasing penetration, an increasing softening point, and a decreasing ductility. The anti-deformation ability under high temperature of Nano-MMT/SBS modified asphalt improved significantly. The softening point of the Nano-MMT/SBS modified asphalt decreased after aging, in contrast with that of the base asphalt, which could be attributed to the different rheological properties between the Nano-MMT/SBS modified asphalt and the base asphalt. Compared with that of SBS modified asphalt, the anti-aging property of Nano-MMT/SBS modified asphalt improved dramatically. This indicated that the lamellar structure of montomorillonite in modified asphalt could prevent oxygen from diffusing and permeating in matrix and the thermo-oxidative aging of base asphalt and SBS weakens.

Abstract: Microscale flyash/SBS composite modified asphalts (CMA) were prepared by melt blending. Rolling thin film oven test (RTFOT) was employed to study the anti-aging property. Both flyash and SBS disperse homogeneously in the base asphalt, which lead to an improvement in terms of toughness, strength, and thermal stability. Moreover, microscale flyash plays a significant role in the CMA. The effect of flyash on the properties of SBS modified asphalt appears as a decreasing penetration, an increasing softening point, and a decreasing ductility. The anti-deformation ability under high temperature of the CMA improved significantly. In comparison with that of the base asphalt, the softening point of the CMA decreases after aging, which maybe attribute to the different rheological properties between the CMA and the base asphalt. Compared to that of SBS modified asphalt, the anti-aging property of CMA improved significantly. This demonstrates that the microstructure of flyash can prevent oxygen from diffusing and permeating.