Effect of ZnAl Layered Double Hydroxide Containing 2-Hydroxy-4-n-octoxy-benzophenone on UV Aging Resistance of Asphalt

Abstract EN

UV radiation is a main factor to reduce the service life of asphalt pavement due to the UV aging of asphalt binder.

To obtain enhanced UV aging resistance, an organic UV absorber called 2-hydroxy-4-n-octoxy-benzophenone (HNOB) had been intercalated into an inorganic UV absorber called Zn/Al layered double hydroxide (LDH) to play a combined anti-UV role in asphalt binder.

Fourier transform infrared spectroscopy revealed that HNOB anions have been intercalated into the interlayer galleries of Zn/Al-LDH containing HNOB anions (Zn/Al-HNOB−-LDH).

X-ray diffraction results of Zn/Al-LDH containing C O 3 2 − anions ( Zn/Al- CO 3 2 - -LDH ) and Zn/Al- CO 3 2 - -LDH /styrene-butadiene-styrene (SBS) modified asphalt disclosed that asphalt molecules entered into LDH interlayer galleries to form an expanded phase structure.

UV-Vis absorbance patterns showed that Zn/Al-HNOB−-LDH has a better capacity of blocking UV light due to the synergetic effect of HNOB and Zn/Al-LDH.

The chemical fractions analysis, conventional physical tests, and rheological tests of SBS modified asphalt, Zn/Al- CO 3 2 - -LDH/SBS modified asphalt, and Zn/Al-HNOB−-LDH/SBS modified asphalt before and after UV aging testified that Zn/Al-HNOB−-LDH can improve the UV aging resistance of SBS modified asphalt more significantly.