What Is Alkali-Resistant Glass Fibre and How Does It Improve Composite Materials?

Technical Introduction

Alkali-resistant (AR) glass fibre is a type of glass fibre specially engineered to withstand the corrosive effects of alkaline environments. Traditional glass fibres can degrade rapidly when exposed to alkaline substances such as cement or concrete alkalis, leading to loss of mechanical strength and durability. AR glass fibres are produced by incorporating additives like zirconium dioxide (ZrO₂) into the glass composition, significantly enhancing their resistance to alkali attack. These fibres are widely used as reinforcement materials in concrete, composites, and construction applications where long-term durability is critical.

Applications

• Concrete Reinforcement: Used in fiber-reinforced concrete (FRC) and sprayed concrete to improve tensile strength, reduce cracking, and extend service life.

• Construction Industry: Enhances durability in bridges, tunnels, precast concrete, and repair mortars.

• Composites: Reinforces polymer composites for automotive, aerospace, and marine applications requiring alkali resistance.

• Textiles: Used in fabrics for insulation and protective gear exposed to alkaline conditions.

• Water Treatment: Utilized in filters and membranes exposed to harsh alkaline environments.

Advantages

• Superior Alkali Resistance: Maintains structural integrity in highly alkaline environments like concrete.

• High Tensile Strength: Provides excellent mechanical reinforcement to composites and concrete.

• Durability: Resists corrosion, ensuring long-term performance and reduced maintenance.

• Lightweight: Improves strength without adding significant weight.

• Versatility: Compatible with various resin matrices and cementitious materials.

Specifications (Typical Parameters)

FAQ

Q1: Why is alkali resistance important for glass fibres?
A: Standard glass fibres degrade quickly in alkaline environments, such as concrete, causing loss of strength. Alkali resistance ensures durability and longevity.

Q2: How is AR glass fibre different from regular glass fibre?
A: AR glass fibre contains zirconia additives that protect it from alkali attack, unlike regular E-glass fibres.

Q3: Can AR glass fibre be used in all types of concrete?
A: Yes, especially beneficial in high-alkali environments like Portland cement-based concretes.

Q4: What forms are AR glass fibres available in?
A: Commonly available as chopped strands, continuous rovings, mats, or woven fabrics.

Q5: Does AR glass fibre improve concrete crack resistance?
A: Yes, it significantly enhances tensile strength and controls shrinkage cracks.