Abstract
Cement-emulsified asphalt mixture (CEAM), a kind of cold mix asphalt mixture, has the advantages of energy conservation and emission reduction as well as easy construction. However, the performance of CEAM is not as good as hot mixed asphalt mixtures. Hence, in this study, two different fibers were adopted as the reinforcing phase to improve the comprehensive properties of CEAM. The results indicated that the addition proportion and curing time were crucial to fiber-reinforced cement-emulsified asphalt mixture (FRCEAM). The compressive strengths, water stability, and raveling resistances of FRCEAM preparations with polyester or brucite fibers (FRCEAM-PF and -BF, respectively) were enhanced significantly. FRCEAM-PF had the maximum flexural tensile strength and strain, which meant that its low-temperature performance was the best compared to FRCEAM-PF and CEAM. However, the contribution of PF to CEAM high-temperature stability was greater than that of BF. Fiber addition to CEAM not only enhanced the cycles of fatigue loading but also reduced sensitivity to changes in stress level. Furthermore, FRCEAM-BF durability was slightly better than that of FRCEAM-PF. SEM analysis indicated that fibers provided bridging and meshing effects. Although PF and BF showed different enhancement effects, both mixtures met the requirements for hot mixed asphalt mixtures.
Highlights
Cement-emulsified asphalt mixture (CEAM) has become a hot research topic under the subject of green transport because of its advantages in energy conservation and emission reduction, as well as easy construction [1,2,3]
The Marshall stability (MS) of CEAM and fiberreinforced cement-emulsified asphalt mixture (FRCEAM) showed that compared with CEAM, the MS of FRCEAM-PF and -brucite fibers (BF) increased by 22.6 and 32.4% at 7 d and increased by 32.8 and 44.9% at 28 d, respectively (Figure 1)
When the curing age increased from 7 to 28 d, the MS of CEAM, FRCEAM-PF, and FRCEAM-BF increased by 19.8, 29.8, and 31.1%, respectively. This showed that the increased range of MS of the two modified FRCEAM samples was significantly greater than that of CEAM with increased curing
Summary
Cement-emulsified asphalt mixture (CEAM) has become a hot research topic under the subject of green transport because of its advantages in energy conservation and emission reduction, as well as easy construction [1,2,3]. Mechanical properties, including indirect tensile strength (ITS), indirect tensile stiffness modulus, creep stiffness, and durability in term of water sensitivity of cement-emulsified asphalt mixture have been investigated [7,8,9,10]. Road performance, such as wheel-tracking and fatigue performance, have been studied [11,12,13]. Wang et al [16] have proposed and tried to resolve adhesion decline and road performance decreases of cement-emulsified asphalt mixture in the process of application. Here, modified emulsified asphalt was examined, with fiber additives adopted as the reinforcing phase, and mechanical and road performance of fiber reinforcement on cement-emulsified asphalt mixtures was comparatively examined
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