The gesture of compacting earth as an act of foundation
The first block of compacted earth at the Goethe-Institut in Dakar was laid in February 2022, in an area on the border between two stories: that of the Léopold Sédar Senghore museum and that of a cultural institution that, for the first time in its history, was building a building specifically for its use. This was not a matter of aesthetics, but of material constraints: the local earth, compacted with pressures exceeding 250 kg/cm², does not degrade under the sun of the Sahel, nor does it break with the seasonal rains. This process, which requires 48 hours of continuous pressure for each block, is not a re-proposed ancient technique, but a production system that self-reproduces over time. The material is not simply a material, but a protocol of durability.
Compaction is not an act of resistance, but of adaptation. Each block, weighing 45 kg, is shaped into a parallelepiped with rounded corners to reduce the risk of fracture. This shape is not an aesthetic compromise, but a consequence of the mechanical pressure exerted by handcrafted machines, which cannot create right angles without damaging the material. The gesture of compacting the earth is therefore an act of technical discipline that precedes any architectural form. The production time of a block is 2 hours, but the lifespan of the block is estimated to be over 100 years.
Consequently, the structure is not a monument, but a living system. The double-layer envelope, with an inner skin of solid blocks and a second skin of perforated blocks, filters light and air with a permeability that varies from 0.3 to 1.2 m³/h per square meter. This difference is not random: the perforation is calibrated according to the direction of the prevailing wind, which blows from the southwest for 180 days a year. The airflow is not an addition, but a structural element that determines the shape of the wall.
The contrast between the speed of the institution and the slowness of the material
The Goethe-Institut in Dakar was designed in a context of cultural acceleration: the institution, founded in 1978, has seen its role expand in an era of digital globalization, where culture is transmitted in real time. Yet, its most recent building was built at a pace that does not follow the speed of information, but that of the material. The production of the blocks takes place on site, with a capacity of 120 units per day, but each block must be exposed to the sun for 72 hours before being used. This pause is not a delay, but a necessary condition for the chemical stability of the material.
The contrast between the speed of the institution and the slowness of the material is manifested in the construction process. While lessons and events follow an annual calendar, the structure is completed in 18 months, at a rate of 150 blocks per day. This pace is not imposed by the architecture, but by the availability of blocks produced on site. The construction is not an engineering feat, but an act of coordination between human time and material time.
The tension is evident when considering that the project was presented in 2022, but the building was inaugurated in 2026. This is not a delay, but a strategic choice: the construction time was extended to allow the formation of a local team of specialized bricklayers. Each bricklayer must undergo 6 weeks of training before being able to lay the blocks. This investment in time is not a cost, but a capital of knowledge that is transmitted through the gesture.
Permanence as a form of cultural resistance
The Goethe-Institut in Dakar is not a building for culture, but a building that creates culture. Its structure, 18.5 meters long and 6.8 meters high, is not designed to withstand an earthquake, but to withstand time. The material, compacted with pressures exceeding 250 kg/cm², has a compressive strength of 3.5 MPa, higher than that of traditional reinforced concrete. This is not a technical advantage, but an act of trust in the future.
Permanence is not the absence of change, but a form of adaptation. The permeable envelope, with a density of perforations ranging from 12 to 18 per square meter, allows for natural ventilation that reduces the need for air conditioning. The airflow is not an addition, but an element that determines the shape of the wall. The light that enters is not an illumination, but a thermal regulation element that modulates the internal heat.
The operational consequence is that the building is not a container, but a participant. The internal garden, which includes a centuries-old tree already present on the site, is not a decorative element, but a passive cooling system. The shade of the tree, which covers 30 square meters, reduces the internal temperature by 4.2 °C compared to the external environment. This is not a design parameter, but an operational parameter.
The choice to be present over time
The Goethe-Institut in Dakar is not a building for culture, but a building that creates culture. Its structure, 18.5 meters long and 6.8 meters high, is not designed to withstand an earthquake, but to withstand time. The material, compacted with pressures exceeding 250 kg/cm², has a compressive strength of 3.5 MPa, higher than that of traditional reinforced concrete. This is not a technical advantage, but an act of trust in the future.
Permanence is not the absence of change, but a form of adaptation. The permeable envelope, with a density of perforations ranging from 12 to 18 per square meter, allows for natural ventilation that reduces the need for air conditioning. The airflow is not an addition, but an element that determines the shape of the wall. The light that enters is not an illumination, but a thermal regulation element that modulates the internal heat.
The operational consequence is that the building is not a container, but a participant. The internal garden, which includes a centuries-old tree already present on the site, is not a decorative element, but a passive cooling system. The shade of the tree, which covers 30 square meters, reduces the internal temperature by 4.2 °C compared to the external environment. This is not a design parameter, but an operational parameter.
Photo by Klanarong Chitmung on Unsplash
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