What Properties of GRC Can Acrylic Emulsion Improve as a Cement Modifier?

As a cement modifier, acrylic emulsion (acrylate emulsion) significantly enhances the four core properties of GRC: toughness, bond strength, impermeability, and durability. Qinglong Group's 28 years of applied research show that adding 8-12% acrylic emulsion (by weight of cementitious materials) increases the fracture energy of GRC from a baseline of 2-4 kJ/m² to 8-15 kJ/m², a 3-4 fold improvement; bond strength to the substrate increases by more than 50%; water absorption drops below 4%; and frost resistance reaches F300 or above. In the Shenzhen Yirui Biotechnology Building project, we combined acrylic emulsion with silica fume to increase the impact resistance of 12mm-thick ultra-thin GRC cladding panels by 5 times, while greatly improving construction workability. During cement hydration, acrylic emulsion forms polymer films that interweave with the cement paste, creating an organic-inorganic composite structure and achieving a qualitative leap in material performance.

Toughness Improvement Is Most Significant

Once formed into films, acrylic emulsion exhibits high elasticity, effectively bridging micro-cracks and transforming GRC from a brittle material into a quasi-ductile material. Failure occurs through multiple cracking rather than sudden fracture, with crack widths controlled below 0.1mm, greatly improving safety in use. After acrylic emulsion is added to Qinglong GRC, falling ball impact tests show no fragment spalling on the back of specimens, with only a micro-cracked zone forming on the front face.

Comprehensive Improvement in Bond Performance

Acrylic emulsion greatly increases the bond strength between GRC and various substrates (concrete, steel, old GRC), raising it from 0.5-1.0 MPa for ordinary mortar to 1.5-2.5 MPa. This greatly improves the bonding effect of GRC repair mortar. During maintenance of the Wuhan Han Show Theatre, we used acrylic emulsion-modified mortar for local repairs, achieving a bond strength of 2.0 MPa and seamless integration with the original components.

Simultaneous Improvement in Impermeability and Durability

Polymer films block capillary pores, reducing water absorption by more than 50% and lowering the chloride ion diffusion coefficient by an order of magnitude. Meanwhile, the flexibility of acrylic emulsion effectively relieves thermal stress and reduces shrinkage cracks. In Hainan's high-temperature, high-humidity environment, the service life of acrylic emulsion-modified GRC is expected to extend by more than 50%.

Markedly Optimized Construction Performance

The air-entraining effect and lubricating action of acrylic emulsion improve the water retention of the mix, enhance cohesion, and extend workable time. It is particularly suitable for vertical surface casting and complex shape construction. Qinglong Group precisely controls the dosage and mixing process to fully realize the advantages of acrylic emulsion while avoiding excessive air entrainment.

Acrylic emulsion modification is an important advance in GRC technology. Qinglong Group has mastered the blending technologies for various polymers, providing customers with GRC products of superior performance and broader applicability.