Title:
Freeze-Thaw Damage of Polypropylene Fiber-Reinforced Recycled Concrete (Prepublished)
Author(s):
Ping Xu , Han Li , Zhiwei Zhang, Chaowei Du, Tianchu Feng
Publication:
Materials Journal
Volume:
Issue:
Appears on pages(s):
Keywords:
damage modeling; freeze-thaw cycle; mechanical properties; polypropylene coarse fiber; recycled brick aggregate
DOI:
10.14359/51750602
Date:
3/19/2026
Abstract:
This study evaluated the performance of recycled brick-concrete aggregate concrete (RB-CAC) incorporating both recycled brick aggregate (RBA) and recycled concrete aggregate (RCA). It further examined the reinforcement effects of polypropylene macrofibers (PPMF) on the composite and assessed its mechanical properties and frost resistance. The results showed that incorporating 15% RBA reduced the compressive and splitting tensile strengths of concrete by less than 20%, while the peak load decreased by 28.8%. Fiber incorporation effectively mitigated compressive strength degradation and significantly enhanced tensile strength, with the optimum fiber dosage at 0.9% by volume. However, RBA incorporation reduced frost resistance, resulting in a 37.6% strength loss and a 40.6% mass loss after 100 freeze-thaw cycles. In contrast, a 0.6% fiber admixture improved frost resistance, reducing strength loss and increasing the relative dynamic elastic modulus by 26.7%. Finally, the study established a frost-resistance durability prediction model based on PPMF and RBA content.