LANXESS is deepening its engagement with next-generation concrete technologies by advancing research into the performance of iron oxide pigments across emerging construction applications, including self-compacting concrete (SCC), geopolymers and 3D-printed concrete. Through extensive investigations and long-term weathering tests, iron oxide pigments have proven their suitability for a wide range of concrete construction materials, though their use in new formulations requires a thorough understanding of construction chemistry and material interactions.

According to Oliver Fleschentraeger, Technical Service for Construction Materials, LANXESS Inorganic Pigments Business Area, the company works closely with customers, additive manufacturers and universities to support the development of new concrete technologies. This effort is backed by LANXESS’s application-engineering construction materials laboratory and a technical center for pigment applications, enabling in-depth testing of pigment properties and their impact on concrete performance.

In the case of self-compacting concrete, which is widely used for complex reinforced structures and architectural concrete surfaces, LANXESS addressed challenges related to non-homogeneous coloring. Detailed studies revealed that polycarboxylate ether (PCE) plasticizers, while essential for flowability, can negatively affect pigment distribution when used in higher quantities. Following comprehensive laboratory analysis, LANXESS experts, in collaboration with external institutes, identified ways to optimise SCC formulations to ensure uniform coloration.

The company is also researching pigment behaviour in cement-reduced systems such as geopolymers, which offer lower CO₂ emissions compared to conventional cement. Unlike alkali-activated materials, geopolymers lack charge potential, posing challenges for durable pigment fixation. LANXESS is currently working with industry and research partners to develop viable solutions.

Additionally, LANXESS is supporting colour innovation in 3D-printed concrete. In collaboration with TU Dresden, the company has validated the suitability of its iron oxide pigments, particularly red pigments produced using its proprietary Laux process, for high-resolution and DIN-compliant 3D concrete printing applications.