Abstract
Semi-flexible pavement (SFP) is made up of a porous skeleton of asphalt mixture and cement grout. This special structure granted SFP superior strength and durability and made it a promising solution for the paving of heavy trafficked area. This paper performed in-depth study on the mechanistic behavior of SFP. Firstly, the volumetric mix design of SFP was introduced, and followed with strength, moisture susceptibility, viscoelastic behavior, fatigue life as well as rutting resistance through a series of laboratory tests. Marshall stability tests and dynamic stability tests suggested that SFP gained fair strength and rutting resistance from the curing of cement grout. Meanwhile, SFP was found not sensitive to freeze–thaw cycles through indirect tensile tests. In dynamic modulus tests, SFP exhibited significant viscoelastic behaviors. In four-point beam fatigue tests, the average fatigue lives of SFP reached 85.4 k loading repetition under 400 µε level. In Hamburg wheel tracking tests, the ultimate rutting depth of SFP was smaller than 2.5 mm. The viscoelastic behavior and rutting propagation of SFP was characterized with master curve and power function by fitting the test results. SFP was also compared with traditional asphalt mixtures in MMLS3 accelerated tests and its performance turned out to be prevailing.
Highlights
Semi-flexible pavement (SFP) is a composite structure of open-graded asphalt mixture filled with cement grout
Husain et al [14] studied the effects of aggregate gradation and concluded that air voids in asphalt matrix would positively contribute to the compressive strength of SFP
Dynamic modulus test was used to study the viscoelastic behavior by applying multi-frequency loads at different temperatures, and a sigmoidal master curve would be fitted to characterize the modulus variation under these conditions
Summary
Semi-flexible pavement (SFP) is a composite structure of open-graded asphalt mixture filled with cement grout. It was firstly proposed by French engineers in the 1960s, known as Salviacim [1]. The material design of SFP included two key elements, open-graded asphalt mixture and cement grout. Husain et al [14] studied the effects of aggregate gradation and concluded that air voids in asphalt matrix would positively contribute to the compressive strength of SFP This behavior was contrary to traditional asphalt pavements. Wang et al [17] added carboxyl latex into cement grout and used a warm-mix technique in open-graded asphalt mixture. CCyylliinnddeerr ssppeecciimmeennsswweerreepprerpeparaerdedfofrodr ydnyanmamicimc modoudluslutsesttessatsndanHdaHmabmurbguwrghewehl etrealctkriancgk.inAgs. fAors ffoourrf-opuorin-pt obienatmbefatmigufaettigesutes, tselsatbs,spsleacbimspenesciwmiethnsthweisthamtheegrsadmaetiognraadnadtiaosnphanaldt caosnptheanltt wcoenretecnotmwpearcetecodmwpitahctaedrowlleitrh. a roller
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
