As part of its international development, EXEGY has deployed its formulations of low-carbon concrete solutions in multiple construction sites and projects all over the world. In line with the core objective of the VINCI Group to use 90% of low-carbon concretes by 2030, and already well established in France, EXEGY now focuses on its international development. As part of this expansion, we propose you a new series of articles on our worldwide projects: EXEGY Beyond.
Among the international construction sites using the EXEGY® formulations is the Sullivan 25 Mexican project, which began in February 2023. CIMESA—a subsidiary of Soletanche Bachy, itself a company of VINCI Construction—tasked with the foundations and superstructure of this 11-floor and 2-basement office tower in the heart of Mexico City, on a site of over 2,500 m², has chosen EXEGY® low-carbon concrete solutions for its foundations package, which ended in June 2024.
In a context of rising interest of the Mexican market of construction for environmental issues, this is the first time that CIMESA uses low-carbon structural concrete in in the country, thereby further exposing the country to low-carbon concrete per se, and establishing itself as a pioneer of this innovation in Latin America.
Out of the 5,995 m³ of concretes poured for the tower’s foundations, 1,157 m³ of them are formulated with EXEGY®, including 263 m³ of structural concrete: 92 m³ of diaphragm walls and 171 m³ for piles. For its binders, the low-carbon brand’s solutions have been synergically produced with CPC 40 RS limestone-filled cement and a replacement of 33% of this same cement with fly ash from the specialized supplier RODTAM. This is unprecedented in Mexico, as prior to this project, CIMESA had only used the brand’s formulations for non-structural concrete, namely mortar filling conform with EXEGY standards.
Successfully put to the test for the very foundations of the tower built on the characteristic soft clay soils of the region, EXEGY® solutions have demonstrated their quality and durability through their utilization for the fundamental structures of the tower, and a C35/45 resistance class. As for its aggressivity class, it is defined in the Mexican standard NMX-C-155-ONNCCE, and has been established notably through performance tests pertaining to chloride permeability and resistivity.
With a carbon footprint of 180 kg eq. CO2/m³, 38% less than the usual concrete (made of CPC 40 RS limestone-filled cement without replacement with fly ash), EXEGY® solutions allow a significant reduction of CO2 emissions.
Finally, the success of this operation is also explained by the collaboration between CIMESA and the local concrete supplier Moctezuma for the adapted transition to low carbon and the supply of the site in concrete.
Realized for the CCLA real estate group and its Mexican subsidiary Estrategia Urbana, the Sullivan 25 Tower is expected for delivery in 2025. A decisive turning point for EXEGY, Soletanche Bachy as well as the Americas and Oceania Division of VINCI Construction, the Sullivan 25 Tower is a visionary project contributing to the momentum of the new era of low-carbon concrete in the world.
