A new slab system with precast concrete lattice-reinforced joists began to be developed in Germany in the mid-20th century, using brick blocks as filler, and a cement and sand topping. This new system was introduced in Brazil in the 1940s. The ever-changing requirements of modern architecture, and the growing need for efficiency in civil engineering,…

Pre-cast concrete blocks are made from cement, sand, and gravel, and they tend to get stronger over time, thus make them a great choice for building. Concrete has been used in construction since the late 1800s. It was first used in South Africa when the first reinforced concrete, coal-washing plant was constructed in Vereeniging in…