Factors influencing rheological properties of fresh cement asphalt emulsion paste: Fid-Bau Portal

Factors influencing rheological properties of fresh cement asphalt emulsion paste

Tan, Yiqiu / Ouyang, Jian / Li, Yunliang

Highlights • The factor of the rheological properties of fresh CA paste was studied. • Viscosity modifying agent greatly improves the yield stress of CA paste. • Asphalt emulsion stability affects the growth rate of plastic viscosity of CA paste. • Superplasticizer reduces the yield stress of CA paste and its growth rate.

Abstract As a grouting material, the flow ability and uniformity of fresh cement asphalt emulsion mortar (hereinafter abbreviated as CA mortar) are governed by its rheological properties. The rheological properties of fresh cement asphalt paste were investigated, in which influencing factors, such as type of asphalt emulsion, superplasticizer dosage, and water to cement ratio, were discussed. Results indicate that CA paste with plain asphalt emulsion has too low yield stress to resist segregation, while it has good yield stress when employing asphalt emulsion modified by viscosity modifying agent. Superplasticizer can reduce the initial yield stress and plastic viscosity, however, its water-reducing effect is not obvious for the water-reducing effect of emulsifier in asphalt emulsion. The stability of asphalt emulsion affects the growth rate of plastic viscosity of CA paste, and superplasticizer dosage affects the growth rate of yield stress, which both affects the retention ability of good fluidity. Therefore, a well stable asphalt emulsion modified with viscosity modifying agent, and high superplasticizer dosage (1% recommended in here) are preferred to produce CA mortar.