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orianapolito: hola papito Alejandro Salgado: hi oriana orianapolito: how are you? Alejandro Salgado: I'm fine and you? orianapolito: good thank you. So, what are you going to talk to me about? Alejandro Salgado: I am going to talk to you about concrete, how about you? orianapolito: I am going to tell you a little bit about stones Alejandro Salgado: Ok, I am going to start Alejandro Salgado: Concrete is a construction material composed of cemen,as well as other cementitious materials such as fly ash and slag cement, aggregate,water, and chemical admixtures. The word concrete comes from the Latin word "concretus" Alejandro Salgado: cement* orianapolito: Wow, that's very interesting, I didn't know. What else? Alejandro Salgado: Well Oriana, many ancient civilizations used different forms of concrete using dried mud, straw, and other materials. Concrete may have been poured to build the Great Pyramids about 5,000 years ago and Romans constructions also Alejandro Salgado: I also now about the composition of concrete, which has cement, water, mineral admixtures and blended cements Alejandro Salgado: The concrete is strong, not elastic, and has a very low coefficient of thermal expansion orianapolito: Do you know about the types of concrete? Alejandro Salgado: Yes, I know. There are two types of concrete. Mix design, which is made for a specific situation or construction and regular concrete, which is the common type of it orianapolito: Well Alejandro, now I think I know enough about it. Are you ready to hear about stones? Alejandro Salgado: Yes. Tell me all about it! orianapolito: As you and everyone should know, stones are also known as rocks. There are lots and lots of it and they are very easy to find in nature, that's why they are so common in construction. orianapolito: Stones have a lot of purposes. Thet can be used for decoration and construction orianapolito: They are hard, the have durability, and they can be shaped, but they are also very heavy, that's why they are sometimes a pain in the neck. Alejandro Salgado: And why do you think stones are used for construction? orianapolito: I think because they are very hard and they can adapt to a lot of situations. When they are combined with other materials they make a rigid structure that has durability, and they can also be used for decorative purposes. They are very flexible Alejandro Salgado: Thank you Oriana for all the information! It was a pleasure to hear about it Alejandro Salgado: Bye bye!! orianapolito: Bye bye Alejandro, talk to you soon!