Editors:
Ippei Maruyama, Ryoma Kitagaki, Atsushi Teramoto, Go Igarashi, Yuya Suda.

The concrete sector—traditionally a major consumer of natural resources—urgently needs to transition toward a circular economy, maximize the effective utilization of industrial by-products, and substantially reduce CO₂ emissions.
Within this framework, mineralization technologies utilizing gaseous or atmospheric CO₂ are increasingly recognized for their versatility—whether in facilitating component separation in waste materials, imparting reactivity, or enabling permanent carbon sequestration. As a result, extensive technological development is progressing rapidly worldwide.
The 1st RILEM International Conference on Mineral Carbonation for Cement and Concrete (supported by RILEM TC MCP: Accelerated Mineral Carbonation for the production of construction materials) was successfully held on April 16–17, 2024, in Aachen, Germany. The inaugural event highlighted state-of-the-art technologies while clarifying underlying scientific and engineering challenges and future perspectives. The second conference was held on 28-30 September 2026, at the University of Tokyo, with support from the Japan Concrete Institute.
Over 180 participants from a wide range of countries contributed to the diverse topics discussed at the conference.
After the 2nd MC3 conference, JACT provides the opportunity to consolidate the research related to mineralization techniques. It is not strictly limited to the technology itself; all the topics discussed in the MC3 are the target of this special issue:

Editors:
Barbara Lothenbach, Andreas Jenni, John Provis, Ellina Bernard.

The 7th International Workshop: Mechanisms and Modelling of Waste/Cement Interactions was held June 22-24, 2026, at Bern, Switzerland. The workshop “Mechanisms and Modelling of Waste/Cement Interactions” focuses on the understanding and modelling of the processes responsible for the stabilization of hazardous and radioactive wastes in cementitious systems, and on the use of mineral wastes as cementitious (raw) materials. Like the very successful earlier meetings in this series of workshops (Meiringen, 2005; Le Croisic, 2008; Ghent, 2013; Murten, 2016; Karlsruhe, 2019; Prague, 2023), the 7th workshop on Mechanisms and Modelling of Waste/Cement Interactions brought together world-leading and junior scientists from the different branches of the research community. :