Abstract
Cement asphalt emulsion mixture (CAEM) presents low early-age strength and poor flowability, which limits its application range at a certain degree. In this paper, CAEM with high early-age strength and flowability was proposed. The flowability, compressive strength, flexural strength of CAEM at different periods and 28d elastic modulus of CAEM were investigated. In addition, evolution of composition and microstructure of CAEM was analyzed by X-ray diffraction (XRD), scanning electronic microscope (SEM), and mercury intrusion porosimetry (MIP). The results indicated that the compressive strength of CAEM can be enhanced quickly in several hours. It could achieve 17-24MPa at 6h and almost reached 79%-90% of the 28d compressive strength. SEM and XRD analysis found that the hydration products in CAEM at different periods were obviously different. The hydration products of 2h filled the micro pores of the mixture. After 28d, the hydration products were connected to each other, resulting in a denser structure. The results of MIP analysis showed that the pore cumulative volume of CAEM was similar for 2h and 28d samples. These results testified that CAEM had high early-age strength.
Highlights
Cement asphalt emulsion mixture (CAEM) is an organic-inorganic composite material formed by the combination of hydration of cement and demulsification of emulsified asphalt
The high early-age strength and flowability of CAEM were studied in this paper, and evolution of microstructure of CAEM was analyzed by X-ray diffraction (XRD), scanning electronic microscope (SEM), and mercury intrusion porosimetry (MIP) to reveal the hardening mechanism of CAEM
Based on the experimental results, the following conclusions can be drawn: (1) The flowability of fresh CAEM is strongly affect by both asphalt to cement ratio (A/C) ratio and water to cement ratio (W/C) ratio
Summary
Cement asphalt emulsion mixture (CAEM) is an organic-inorganic composite material formed by the combination of hydration of cement and demulsification of emulsified asphalt. CAEM has been widely used in road maintenance and rehabilitation due to the combined merits of the high mechanical properties of cement materials and the flexibility of asphalt materials, low environmental impact, and cost effectiveness (Zhong and Chen, 2002; Lu et al, 2009; Qiang et al, 2011; Doyle et al, 2013; Tian et al, 2013; Tyler et al, 2014; Ling et al, 2016; Ouyang et al, 2020). There will be secondary damage occurred on the repair site when it is exposed to the adverse weather such as rainfall or freezing and thawing.
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