zielsicher Englisch, Bautechnik, Schulbuch

Read the following text and learn about concrete basics. Concrete is a composite material. Its components are cement aggregate and water. Aggregate may consist of coarse aggregate (like gravel), fine aggregate (like sand) and other admixtures according to a specification given by the structural engineer. The most common type of concrete is Portland cement concrete. We’ll have a closer look at cement later on. By mixing all the components together, a semi-liquid mass is produced that can be shaped and poured into forms. At this stage, concrete offers great flexibility and workability. When producing concrete, cement reacts chemically with water (hydration). Thus concrete sets by “getting wet!” Finally, a building material is created that has characteristics similar to stone. Most supporting building parts are made with reinforced concrete. This is concrete in which steel elements like steel bars or steel rod mats are included. By doing so it can bear heavy loads and build- ing parts can be connected. Find the English meanings of the words in the text above. Grobe Gesteinskörnung coarse aggregate Zumahlstoff admixture Feine Gesteinskörnung fine aggregate Zement cement Kies, Schotter gravel Stahlbeton reinforced concrete Summarize the text above by creating a chart. Answer the following questions. 1. Which components does concrete consist of? 2. Can you explain “hydration”? 3. Why do builders use reinforced concrete? 01 A2–B1 Word bank dome Kuppel reinforcement Bewehrung 01 composite material Verbundmaterial component Bestandteil specification Angabe, Spezifizierung structural engineer Statiker/in most common am häufigsten semi-liquid halbflüssig shape formen pour gießen workability Bearbeitbarkeit set hier: erhärten steel bar Stabstahl steel rod mats Bewährungsmatte bear tragen 02 A2–B1 03 A2–B1 Concrete Last summer, Marcus visited Rome in Italy. He was quite surprised to learn that the ancient Romans had already been heavy users of an early kind of concrete technology and had even managed to build huge concrete domes without reinforcement. Do you know a building from that period, which was made of concrete? 112 Unit 26 Nur zu Prüfzwecken – Eigentum des Verlags öbv