Since the time of ancient Rome, the newly discovered cement (opus caementitium) turned out to be a very durable construction material. However, it had one drawback – perfectly withstanding compressive loads, the cement fell apart when stretched. Only reinforcement could help to avoid this. To make the roofing sheet relatively thin, mineral fibers were used to reinforce cement products.
The most outstanding characteristics of then known fibrous minerals were those of asbestos, known for its strength and fire-resistant properties since ancient Greece. The term was created by the ancient Greeks and means “invincible, undestroyable”. Large-scale production of asbestos-cement roofing and wall boards was started by the Austrian inventor Ludwig Hatschek in 1893.
All fine, but we already know what happened to asbestos roofing all over the world and what awaits them in Great Britain. For the first time, the replacement of asbestos fiber was proposed only in 1979. Eternit AG, Switzerland, in collaboration with German, Austrian and Belgian scientists, studied more than 250 samples of different environmentally neutral fibers.
As a result of the experiments, it was decided to use synthetic fibers made from polyvinyl alcohol. In all other respects, the production process repeated the technologies described by Ludwig Hatschek at the end of the 19th century – fiber cement is a mixture of water, portland cement and synthetic fiber in different proportions, depending on the material purpose.
Fiber cement roof slates are also made using the same centuries-old technology, but the material is innovative due to the use of synthetic reinforcing fibers.