---
title: "3D printed PLA reinforcement reaches 80% of steel’s strength in construction beams"
url: https://www.voxelmatters.com/3d-printed-pla-reinforcement-reaches-80-of-steels-strength-in-construction-beams/
date: 2026-06-09
modified: 2026-06-09
lang: en
author: "Joseph Caron-Dawe"
description: "A research team at the University of Sharjah tested 30 small-scale cement mortar beams reinforced with 3D printed polylactic acid (PLA) profiles, and found that surface geometry was the dominant..."
categories:
  - "Advanced Polymers"
  - "AM Research"
  - "Construction 3D Printing"
tags:
  - "future"
image: https://www.voxelmatters.com/wp-content/uploads/2026/06/3D-printed-PLA-reinforced-construction-beams-01-640x427.jpg
word_count: 401
---

# 3D printed PLA reinforcement reaches 80% of steel’s strength in construction beams

[A research team at the University of Sharjah](https://www.voxelmatters.com/cybe-construction-3d-print-houses-sharjah-uae/) tested 30 small-scale cement mortar beams reinforced with 3D printed polylactic acid (PLA) profiles, and found that surface geometry was the dominant factor in structural performance. 

The study, [published in the journal *Construction and Building Materials*](https://www.sciencedirect.com/science/article/abs/pii/S0950061825048111?via%3Dihub), compared round bars against flat plates and straight profiles against wavy, serrated, and triangular variants. The best-performing configuration — a triangular wavy PLA plate — reached nearly 80% of the bending strength of a conventionally steel-reinforced beam and matched its ductility, flexing under load rather than fracturing.

The work was led by Dr. Muhammad Talha Junaid, Associate Professor in the Department of Civil and Environmental Engineering at the University of Sharjah. Beams were tested in a three-point bending configuration using an FDM printer to produce the reinforcement profiles. Flat plates outperformed round bars by a substantial margin, and were able to handle roughly twice the peak load and absorb approximately five times more energy before failure. That was despite being produced from identical material.

[The mechanism behind the performance gap came down to bond behavior](https://www.voxelmatters.com/construction-grade-structural-beams-3d-printed-by-mit-team-using-recycled-plastic/). The serrated shapes acted like teeth, locking into the concrete to prevent slipping, while the plain profiles offered little mechanical interlock with the surrounding matrix. That left the reinforcement free to slip when loads were applied.

[![3D printed PLA reinforcement reaches 80% of steel's strength in construction beams](https://www.voxelmatters.com/wp-content/uploads/2026/06/3D-printed-PLA-reinforced-construction-beams-02-640x427.jpg)](https://www.voxelmatters.com/wp-content/uploads/2026/06/3D-printed-PLA-reinforced-construction-beams-02.jpg)

AI-generated image

## The corrosion case for polymer reinforcement

The research delved into a common structural problem, whereby steel rebar begins corroding once moisture and chloride ions penetrate the concrete matrix — a process that causes the steel to expand, crack the surrounding concrete, and ultimately compromise structural integrity. The effect is most pronounced in marine environments, coastal construction, and infrastructure exposed to road de-icing salts.

Non-metallic reinforcement alternatives, including glass-fiber and carbon-fiber reinforced polymer bars, are already in commercial use in corrosion-prone applications, but carry a significant cost premium over steel. PLA is among the most widely available and least expensive FDM materials, and the Sharjah team's approach of printing custom profiles to order — rather than rolling standardized bar stock — positions it differently from existing fiber-composite products.

The study reframed the design problem from material selection to profile optimization. The construction sector has been moving toward AM-based production methods to reduce material waste and enable on-demand fabrication of complex geometries, and printable structural reinforcement fits that trajectory directly. Questions do still remain around long-term creep, thermal performance, and sustained tensile loading.