Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6426810 | Cold Regions Science and Technology | 2015 | 7 Pages |
â¢Mg-Al Clâ LDH decreases the melting ice point of water.â¢Asphalt mixture containing Mg-Al Clâ LDH has a sustainable anti-freeze property.â¢Mg-Al Clâ LDH reduces the adhesion force between ice and asphalt mixture.â¢Mg-Al Clâ LDH confines Clâ and does not pollute environment.
Mg-Al Clâ layered double hydroxide (LDH) was prepared from Mg-Al CO32Â â LDH by the calcination recovery method. Energy-dispersive spectroscopy spectra show that Clâ anions replace CO32Â â anions in the LDH structure. X-ray diffraction patterns and scanning electron microscopy images show that the intercalation spacing and platelet thickness of Mg-Al Clâ LDH are larger than those of Mg-Al CO32Â â LDH. This increase in the structural dimensions occurs partially because a larger quantity of monovalent Clâ anions than divalent CO32Â â anions is required to balance the positive charges of the LDH metal cations. The results of melting ice point (MIP) tests indicate that Mg-Al Clâ LDH is more effective than Mg-Al CO32Â â LDH in decreasing the MIP of water. Freezing points (FPs) of asphalt mixtures show that Mg-Al Clâ LDH can reduce FPs. At temperatures below the FPs of asphalt mixtures containing Mg-Al Clâ LDH, the adhesion forces between ice and asphalt mixtures show that Mg-Al Clâ LDH can facilitate ice removal. Immersion tests were conducted to investigate the effect of rain on the melting ice properties of asphalt mixtures. FPs and adhesion force for Mg-Al Clâ LDH do not change after immersion, indicating that rain should not affect the properties of melting ice of Mg-Al Clâ LDH. Conductivities of immersion liquids show that Mg-Al Clâ LDH enables Clâ anions to be retained in asphalt mixtures without adversely affecting the surrounding environment and pavement.