Performance Evaluation of the Polyurethane-Based Composites Prepared with Recycled Polymer Concrete Aggregate

Area of Science:

• Materials Science
• Civil Engineering
• Polymer Science

Background:

• Limited research exists on recycled polymer concrete aggregate compared to recycled cement concrete aggregate.
• Recycled polymer concrete aggregate presents unique challenges due to surface material interactions.

Purpose of the Study:

• To investigate the mechanical and durability performance of polyurethane composites utilizing recycled polymer concrete aggregate.
• To address the strength reduction caused by remolded aggregate and enhance composite properties.

Main Methods:

• Collected and prepared remolded polyurethane-stabilized Pisha sandstone as recycled aggregate.
• Fabricated polyurethane-based composites with and without ethylene-vinyl acetate (EVA) modification.
• Conducted unconfined and triaxial compressive tests to evaluate mechanical strength.
• Performed freeze-thaw and wet-dry cycle tests to assess durability.

Main Results:

• The use of remolded Pisha sandstone aggregate initially reduced composite compressive strength due to poor bonding.
• Incorporation of EVA significantly enhanced both unconfined and triaxial compressive strength.
• EVA modification improved the composites' resistance to freeze-thaw and wet-dry degradation.

Conclusions:

• EVA addition effectively compensates for strength loss in polyurethane composites with recycled aggregate.
• EVA enhances the bond between the polyurethane matrix and the remolded sandstone aggregate.
• The developed material shows potential for sustainable construction applications through improved mechanical and durability performance.