Title:
Will Different Crystal Forms of Al2O3 Fibers Affect the Mechanical Properties of Oil Well Cement? (Prepublished)
Author(s):
Dongjun Wang, Yu Zu, Chenkang Zhao, Hongyu Guo, Weizhong Wang，Jie Chen, Rui Jin, Xinxin Li,Chen Hu, and Chunmei Zhang
Publication:
Materials Journal
Volume:
Issue:
Appears on pages(s):
Keywords:
α-Al2O3 fibers; γ-Al2O3 fibers; hydration; mechanical properties; oil well cement
DOI:
10.14359/51750603
Date:
3/19/2026
Abstract:
The study investigates the impact of α-Al2O3 fibers and γ-Al2O3 fibers on the mechanical properties of oil well cement paste. The results show that adding 1.5% α-Al2O3 fibers to the cement paste increases compressive and tensile strength by 69.98% and 65.20%, respectively, compared to pure cement paste after 7 days of curing. The cement paste with α-Al2O3 fibers also exhibits higher compressive and tensile strength compared to the cement paste with γ-Al2O3 fibers. The study also reveals that both types of Al2O3 fibers reduce the presence of portlandite and accelerate the formation of early-age ettringite. The optimization effect of Al2O3 fibers on the pore structure of cement paste exceeds the inhibition effect on its hydration, thus improving the mechanical strength of cement paste. In addition, Al2O3 fibers improve the toughness of cement paste by means of fiber pull-out and crack bridging. The chemical characteristics of fibers play an important part in influencing the reinforcing capabilities of composites that incorporate these fibers.