PAM-Modified Alkali-Activated Cementitious Material

Significantly improved toughness

Polyacrylamide reduces porosity and prevents crack propagation through filling, bridging, and film-forming, significantly improving the toughness of slag/fly ash-based alkali-activated cementitious materials.

Ze, Yu · Wang, Baomin · Tianru, Li · Wang, Wanli

Construction and Building Materials 2024

Specifications

Optimal PAM dosage

{'zh': '6', 'en': '6'} ‰

Advantages

Low cost and simple processing

PAM is a low-cost water-soluble polymer that can be added directly during mixing without changing existing equipment, making it more economical than fiber toughening.

Fills pores and prevents cracks

PAM provides filling, bridging, and film-forming properties that minimize substrate porosity and prevent crack propagation, reducing stress concentration and enhancing toughness.

Extends silicate chains for intrinsic toughness

PAM's long molecular chains can extend the chain structure of silicate tetrahedra, increasing the length of cross-linked and non-cross-linked chains, thereby improving the flexibility of the gel phase and overall toughness.

Applications

• Toughening of alkali-activated cementitious materials：Directly improves toughness of alkali-activated materials, reducing cracking risk.
• Modification of cement-based materials：Used as a modifier for cement-based materials to enhance toughness and durability.
• Eco-friendly construction materials：Utilizes industrial by-products and an eco-friendly polymer, promoting sustainable construction materials.
• High-performance cementitious materials：Enhances mechanical performance and toughness to meet requirements of high-performance cementitious materials.