Release Time:2019-03-12  Hits:

Indexed by: Journal Article

Date of Publication: 2017-08-30

Journal: CONSTRUCTION AND BUILDING MATERIALS

Included Journals: Scopus、EI、SCIE

Volume: 147

Page Number: 566-575

ISSN: 0950-0618

Key Words: Cement asphalt emulsion paste; Rheological properties; Emulsifier; Emulsion type

Abstract: Cement asphalt emulsion (CA) composites are very promising materials suitable for many applications. The rheological properties of CA paste, which can reflect the workability of CA paste and the stability and demulsifying behavior of asphalt emulsion, have attracted much attention. However, the rheological properties of CA paste with different charge types of emulsion (i.e. cationic and anionic) as well as the influencing mechanisms are not clearly understood. In this paper, the rheological properties of CA paste with cationic and anionic emulsion were studied, and the potential influencing factors were analyzed, i.e. pH value, emulsifier, and the adsorption behavior between asphalt droplets and solid particles. Results indicate that the apparent viscosity of CA paste at high shear rate is mainly related to emulsifier type. However, emulsifier type and pH value are not the primary factors of the yield stress of CA paste. The yield stress of CA paste is closely related to emulsion charge types. CA paste with cationic emulsion has a higher yield stress than CA paste with anionic emulsion. This is because that the cationic asphalt droplets has a much stronger adsorbing ability on solid particles surface compared with anionic asphalt droplets. (C) 2017 Elsevier Ltd. All rights reserved.