Recent progress of using carbon fiber in reinforcing cement-based composite and their enlightenment for oil-well cement future

The incorporation of fibers represents a crucial technique for improving the mechanical properties and other relevant characteristics of cement-based composites (CBC), including concrete, cement mortar, and oil-well cement. Especially, carbon fiber (CF) has a great potential for reinforcing oil-well cement due to its high strength, modulus, stiffness, high temperature, corrosion and fatigue resistance as well as chemical stability. There is a huge amount of waste CFs all over the world which show better performance in cement industry, while their reuse will realize waste recovery (good environment impact) and greatly reduce cost. This review paper presents the recent progress of using CF in enhancing mechanical properties of CBC. We put high emphasis on the CF surface modification for reinforcing bond strength at the cement/CF interface. Comprehensive discussion with respect to effects of CF and modified CF on CBC properties is performed. The key properties of CBC examined in this study encompass mechanical characteristics (compressive strength, flexural strength, and tensile strength), dimensional stability (shrinkage behavior), durability indicators (water absorption and permeability), and fracture-related properties (toughness, crack resistance, and impact performance). Thus, suggestions are given for the future study and application of CF in oil-well cement.