Effect of Natural Wollastonite Microfibers on Early-Age Behavior of UHPC

摘要: In this study, the effect of incorporating wollastonite microfibers in ultrahigh performance concrete (UHPC) on its early-age properties was investigated. Wollastonite were added at 0, 4, 8, and 12% as partial volume replacement for cement. Results show that UHPC mixtures are highly affected by microfiber content aspect ratio. Increasing resulted a compressive strength comparable to or higher than control mixture without microfibers. reduced shrinkage strains increased cracking resistance compared mixture. However, no significant improvement flexural behavior achieved with addition because sudden rupture within matrix. can act an internal restraint shrinkage, reinforcing microstructure microcrack level, leading enhancement engineering Partially replacing cement natural leads reduction factor, which represents economic environmental benefits.