Commissioned by property developer Candor, main contractor Cordeel Temse began constructing two new hotels in Diegem in 2021: U-Flats and Trinity. All concrete elements were produced by the subsidiary C-Concrete. Aalborg White cement CEMI52.5R-SR and CEMI52.5R (SWC white cement produced at Cementir's Sinai plant),were used for the white concrete. Binst Architects designed both buildings, which showcase their connection through white concrete façade elements.

Project Information:

Completion Year: 2024

Developer: Candor

Architect: Binst Architects

Contractor: Cordeel Temse

Precast concrete cladding: C-Concrete

White Cement: Aalborg White® CEM I 52,5 R-SR 5 & CEMI52,5R

U-Flats and Trinity


The western building, Trinity, is a nine-storey structure with a distinctive grid façade. The deep window edges and detailed relief enhance the grid's rigidity. Staggered windows on each floor add vibrancy to the façade. Trinity features 208 hotel rooms on the upper floors, with supporting functions like a restaurant on the ground floor.

The eastern building, U-Flats, is a seven-storey aparthotel with 160 rooms for short- and medium-term stays. It includes additional amenities like a gym and guest laundry to accommodate longer stays. Robert Osinga, project architect at Binst Architects, notes: "Trinity's design emphasizes verticality, whereas U-Flats highlights horizontality with dark, horizontal lines. The façade, alternating between glass and concrete panels, features a relief that resembles a gracefully draped voile. The use of white concrete creates a fresh, contemporary look that stands out in the area."


 The three-pronged volume of Trinity.


U-Flats highlights horizontality with dark, horizontal lines 


Nikolas Schack, Quality & Concrete Supervisor at C-Concrete, stated: "We utilized sandwich concrete panels that were prefabricated for on-site installation. These panels included a structural inner wall made of grey concrete, an insulation layer, and an outer wall of white concrete. This method significantly sped up the construction process but resulted in some elements weighing up to 20 tonnes. The white Aalborg White cement ensured a durable, aesthetic appearance but required meticulous care to avoid contamination during production and storage. The unique shapes of certain panels, featuring large window openings and a profiled finish on the outer walls, added complexity to the project. The profiled panels also provided the advantage of better and faster rainwater drainage. For both hotels, we processed a total of 950 concrete elements, using 750 m³ of white concrete."


Staggered window openings and flat façade panels in white concrete. 

U Flats

Façade panels in white profiled concrete. 


Cementir Group has committed to address the pressing challenges of sustainability and environmental issues over the past few years. They have introduced a new CO2 reduced white cement D-Carb® CEM II/A-LL 52.5R. This cement guarantees a 15% reduction in CO2 compared to Aalborg White CEM I 52.5R. D-Carb® is the first white cement in the market to match a lower-carbon footprint with high performance at early ages. It is available in European markets before being launched globally.  

The first batch of D-Carb has been delivered to the C-Concrete plant. “At C-Concrete, we tested the Aalborg White cement CEM II/A-LL 52.5R and found that the processability is good, it has a nice warm white color, and it is perfect for durable construction. So far, everything is running smoothly. We are still in the testing phase and look forward to assessing the compressive strength both after 1 day and 28 days,” commented Nikolas Schack, Quality & Concrete Supervisor at C-Concrete.


Philip Doutreligne Sculpture

Reporter of Beton&Staalbouw

Binst Architects

BINST ARCHITECTS stands for the best of almost 50 years of experience and expertise, supported by a modern and dynamic approach that focuses on the powerful evolution of the construction medium and innovative cooperation models. As ‘architects of tomorrow’, we aim to focus on innovative working methods, optimized housing and reinforced infrastructure that is more than contemporary.

With a broad interest, a multidisciplinary portfolio and a strong mix in terms of scale and budget for our assignments, we provide efficient, expert guidance and supervision of all your construction plans based on an implemented all-round approach with our distinctive, wide-ranging signature.

As architects, our daily task is to increase awareness of urban ideas and architecture in a broad sense, as the future tools par excellence with regard to housing, working and the cultural life of the future, in short, as a medium for modern society. The things around us are becoming increasingly intertwined, and the experiential element is key! BINST ARCHITECTS wishes to contribute to this experiential level from the outset, and therefore in the project definition, and to express it in dialogue with our clients, all building parties involved, the City and its residents.

BINST ARCHITECTS strives for architecture that daily embodies ‘abstract expressionism’, characterized by a healthy balance between intelligent restraint and controlled expression! In short, ‘positive architecture’, originating from smart plans in line with the market to current, controlled urban architecture and relevant iconic landmarks that are unique.

We write Architecture and Ambition with a capital letter because of our continuous efforts and our concern related to presenting our projects in an ambitious, professional and realistic manner. As a multidisciplinary firm, we represent a broad spectrum that brings us closer to the essence and function of a first-class firm offering many possibilities and an artistic presence.