Abstract
In order to investigate the influences of emulsifier types on properties of cement bitumen emulsion mortars (CBEM), anionic and cationic emulsifiers were used to prepare CBEM in this work. Influences of anionic and cationic bitumen emulsions on workability, mechanical properties, and viscoelastic property of CBEM were studied. The workability of CBEM was evaluated by fluidity and extensibility tests. The mechanical properties were assessed by compressive strength and flexural strength tests. XRD was used to analyze the phase before and after bitumen emulsion was added. The viscoelastic property was studied by a dynamic mechanical analyzer (DMA). The results show that CBEM prepared by cationic bitumen emulsion (CBE) has better workability. The mechanical properties of CBEM are negatively affected by bitumen emulsion. The impact on the compressive strength of CBEM prepared by CBE is higher. Bitumen emulsion can significantly improve the viscoelastic property of CBEM. With the increase of bitumen emulsion dosage, the loss factor of CBEM increases. The viscoelastic property at low frequency is better than that at high frequency. In contrast to CBEM prepared by CBE, CBEM prepared with anionic bitumen emulsion (ABE) possesses better viscoelastic property.
Highlights
Cement bitumen emulsion mortars (CBEM) are prepared by cement, bitumen emulsion, water, fine aggregate, and admixtures. e elasticity of bitumen materials and high strength of cement materials are combined in CBEM, which have been widely used in high-speed railway construction
After melting bitumen to the temperature of 180°C, the emulsifier was first poured into the colloid mill, and the melted bitumen with a mass of 600 g was poured into the running colloid mill and emulsified to prepare cationic bitumen emulsion (CBE) and anionic bitumen emulsion (ABE). e water-cement ratio (w/c) was 0.4, the sand-cement ratio (s/c) was 1.2, and the amount of defoaming agent was 2% of the water weight. e different bitumen emulsion content was allocated according to the cement quality of 0–50% with 5% interval
It increases to 308 mm (CBE) and 316 mm (ABE) from 240 mm, and bitumen emulsion content has no significant influence on the extensibility of the CBEM. e addition of bitumen emulsion can effectively improve the extensibility of the CBEM and the influence of the emulsifier types is not significant. e extensibility of CBEM was more than 280 mm
Summary
Cement bitumen emulsion mortars (CBEM) are prepared by cement, bitumen emulsion, water, fine aggregate, and admixtures. e elasticity of bitumen materials and high strength of cement materials are combined in CBEM, which have been widely used in high-speed railway construction. Cement bitumen emulsion mortars (CBEM) are prepared by cement, bitumen emulsion, water, fine aggregate, and admixtures. E elasticity of bitumen materials and high strength of cement materials are combined in CBEM, which have been widely used in high-speed railway construction. Pure bitumen and bitumen emulsion have different influences on the property of CBEM [5]. Studies have shown that anionic bitumen emulsion (ABE) has retarding effect on hydration of cement in CBEM [6]. It is mainly due to the demulsification process of bitumen emulsion in CBEM [8]. Another study shows that the presence of the emulsifier can accelerate the hydration of cement [9]. E demulsification process of bitumen emulsion can be studied and evaluated by ultraviolet spectroscopy [10] Another study shows that the presence of the emulsifier can accelerate the hydration of cement [9]. e demulsification process of bitumen emulsion can be studied and evaluated by ultraviolet spectroscopy [10]
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