硅烷偶联剂对集料表面改性的制备及性能表征.

The granules were surface modified with silane coupling agent to cause hydrolysis and solidification reaction with the aggregate. Based on surface energy theory, infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM), the aggregates before and after modification were characterized by direct stretching, boiling, water immersion Marshall test and freeze-thaw splitting test. The method was used to verify the aggregate performance before and after modification. The results show that the contact angle of the aggregate after the surface modification of the silane coupling agent was reduced, which changed from the original hydrophilicity to the lipophilicity. Infrared spectroscopy (FT-IR) shows that Si-O-C, Si-O-Si covalent bond and hydrogen bond were produced between the silane coupling agent and the aggregate. Scanning electron microscopy (SEM) observed that a polysiloxane coupling layer film was formed on the aggregate surface, indicating that the surface of the aggregate had been introduced into the silane coupling agent. The surface modified aggregate before and after water immersion reduced the tensile strength loss rate by 42.2% compared with the original aggregate. The adhesion grade between the aggregate and the asphalt could reach 5. The asphalt mixture residual stability increased by 11.54% and the freeze-thaw splitting strength ratio increased by 39.26%. These illustrate the successful surface modification of the aggregate by the silane coupling agent, by which the surface properties of the aggregate improved. [ABSTRACT FROM AUTHOR]