World’s first carbon-negative cement

July 01, 2026

Dutch materials innovator Paebbl has introduced Rebond 300, a groundbreaking supplementary cementitious material (SCM) that combines carbon removal with concrete production. The company describes it as the world’s first carbon-negative construction material, offering builders a practical way to lower emissions while permanently storing carbon within infrastructure.

Unlike conventional cement, Rebond 300 is designed to replace up to 30% of Portland cement in standard concrete mixes. This allows manufacturers to significantly reduce the carbon footprint of concrete without changing existing production methods or investing in new equipment.

A carbon-negative material with verified climate benefits

Rebond 300 has received an Environmental Product Declaration (EPD) confirming a carbon footprint of -149 kilograms of CO₂ per tonne of material. Rather than simply reducing emissions, the product actively removes carbon dioxide from the atmosphere and locks it into a stable mineral form for geological timescales.

The latest formulation delivers a dramatic leap in environmental performance, achieving roughly ten times greater carbon efficiency than Paebbl’s first-generation technology.

Accelerated mineralization turns CO₂ into stone

The technology behind Rebond 300 is based on accelerated mineralization, a process inspired by natural geology. In nature, minerals slowly react with atmospheric carbon dioxide to form stone over thousands of years. Paebbl recreates and speeds up this reaction inside a controlled industrial process.

The result is a light-colored mineral powder that permanently binds captured CO₂. Once incorporated into concrete, the carbon remains safely stored throughout the lifetime of the structure, effectively transforming buildings into long-term carbon reservoirs.

According to Paebbl, Rebond 300 goes beyond reducing embodied emissions by actively removing carbon from the atmosphere and integrating it into the built environment.

Easy integration into existing concrete production

One of Rebond 300’s biggest advantages is its compatibility with current construction practices. The material can be blended into conventional concrete recipes and processed using existing ready-mix plants and precast manufacturing facilities.

Because no specialized machinery or workflow changes are required, construction companies can adopt the material without major operational disruption.

At standard replacement levels, Paebbl says Rebond 300 can reduce the total embodied carbon of concrete structures by up to 40%, helping developers, contractors, and manufacturers advance their decarbonization and Scope 3 emissions goals.

Every project built with the material effectively becomes a permanent carbon storage system, capturing and retaining CO₂ within its structural components.

A bright finish without compromising design

Many low-carbon cement alternatives suffer from poor aesthetics, often producing darker concrete that limits their use in visible architectural applications.

Rebond 300 addresses this challenge with a near-white finish and a fine mineral texture, making it suitable for exposed concrete surfaces, façades, public infrastructure, and premium architectural designs where appearance matters just as much as structural performance.

Industry validation through real-world projects

Despite growing demand for sustainable construction materials, the building industry remains highly regulated and cautious about adopting new technologies.

To demonstrate reliability, Paebbl has partnered with major European construction companies, including Holcim and Heijmans, to validate Rebond 300 in commercial applications.

One of the first large-scale demonstrations involved a 420-square-meter industrial floor slab at a retail logistics facility in Germany. The project reportedly met all required strength specifications while incorporating the carbon-negative material into the concrete mix.

Could carbon-storing concrete transform construction?

Scaling production remains the next major challenge for Paebbl. If manufacturing capacity expands successfully, Rebond 300 could reshape the role of concrete in the global transition toward net-zero emissions.

Traditional cement manufacturing generates significant process emissions that cannot be eliminated simply by switching to renewable energy. By lowering production temperatures and permanently mineralizing carbon dioxide inside construction materials, Rebond 300 offers a promising pathway for reducing one of the world's hardest-to-abate sources of industrial emissions.

As cities continue to expand, carbon-negative materials like Rebond 300 could transform buildings, roads, and infrastructure into long-term carbon storage assets while maintaining the performance and durability required by modern construction.