The principal reason for the destruction of the Fort de Loncin was that the ammunition magazines had been placed too close to the surface, and had never been upgraded since their construction to deal with improved artillery.
Problems with concrete construction also became apparent, as techniques for concrete mixing, placement and construction were still being learned.
In particular, a lack of nighttime illumination required that construction be stopped at the end of each day, and a poor understanding of the bonding properties of concrete caused weak points between daily pours of concrete, causing layers of concrete to separate under stress of bombardment or explosion.

These faults were cured with the reconstruction of other forts, the use of reinforced concrete, and with the construction of four new forts facing the German frontier to the east of Liége.
The largest of these was Fort Eben-Emael, which would play a significant role at the beginning of the Second World War.
The principal reason for the destruction of the Fort de Loncin was that the ammunition magazines had been placed too close to the surface, and had never been upgraded since their construction to deal with improved artillery. Problems with concrete construction also became apparent, as techniques for concrete mixing, placement and construction were still being learned. In particular, a lack of nighttime illumination required that construction be stopped at the end of each day, and a poor understanding of the bonding properties of concrete caused weak points between daily pours of concrete, causing layers of concrete to separate under stress of bombardment or explosion. 
These faults were cured with the reconstruction of other forts, the use of reinforced concrete, and with the construction of four new forts facing the German frontier to the east of Liége. The largest of these was Fort Eben-Emael, which would play a significant role at the beginning of the Second World War.
Fort de Loncin