Additive manufacturing is transforming the construction industry. It enables designers to produce building components directly from digital models with greater precision and less waste. Recent research shows that 3D printed polylactic acid (PLA) could replace traditional steel reinforcement in concrete, offering a more sustainable solution.

Biobased Reinforcement For Low-Impact Construction

PLA comes from renewable sources such as corn starch and sugarcane. Its production uses less energy and generates fewer emissions than steel or fossil-based plastics. The material is also lightweight and naturally resistant to corrosion, which improves durability over time.

Design Freedom Through 3D Printing

Researchers used fused deposition modelling (FDM) to produce different reinforcement types. They created both bar and plate elements, including straight and wavy shapes. Unlike steel, 3D printing allows complex geometries that can improve performance.

The team tested 14 concrete beams with different PLA configurations. The results show that shape plays a key role. Wavy and textured profiles improved the bond between PLA and concrete. This led to better crack control and stronger post-cracking behaviour.

This approach shows how geometry can enhance performance. Designers can optimise structures through form instead of relying only on material strength.

Plates Deliver Stronger Performance

PLA plates performed better than traditional bar-shaped reinforcement. Beams with plates carried about twice the load of bar-only systems. They also absorbed up to five times more energy. In the best cases, PLA-reinforced beams reached nearly 80% of the strength of steel-reinforced concrete. Some plate systems also showed similar ductility, which is important for structural safety.

These findings suggest that new reinforcement designs can improve polymer-based systems. Additive manufacturing makes these designs possible.

Towards Circular And Customised Structures

PLA still has limitations. The layer-by-layer printing process can create weak points in the material. However, the study confirms its potential as a non-corroding and more sustainable alternative to steel.

3D printing also enables customisation and local production. This reduces material waste and shortens supply chains. As a result, it supports circular construction strategies. Biobased polymers such as PLA could play an important role in future building systems. They allow designers to create efficient, adaptable, and lower-impact structures.

Source: Elsevier
Photo: sferrario1968