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ФГБОУ ВПО «Самарский государственный технический университет»Архитектурно-строительный институтФакультет промышленного и гражданского строительстваCONCRETE COMPONENTSВыполнилаСтудентка группы П-52Александра ВостриковаПреподавательдоц. Гриднева Н.А. Самара, 2016 Concrete consists of cement, water and aggregates mixed together in the right amounts. Concrete is manufactured from components that are for the most part available locally and requires few raw materials, such as steel, that are in limited, finite supply. There is now available a wide range of cements and a considerable choice of aggregates both natural and artificial. Natural cement is made from nodules consisting of lime, clay, oxides of iron. Since the original production of Portland cement about 200 years ago, there has been a steady and gradual change in the material resulting from improved methods of manufacture and testing. Today there is available a wide range of cements which have been developed to give particular properties, such as durability, resistance to chemical attacks, favourable working properties and low loss of strength on storage. We know Ordinary Portland Cement, Rapid Hardening Portland Cement, Low-Heat Portland Cement, High Alumina Cement. Aggregates can differ in their properties, they can play an active role, and their characteristics often control the behavior of concrete. The types of aggregates used for concrete include fine and coarse, lightweight and heavyweight, natural and artificial.Concrete aggregate production Fine and coarse aggregates make up the bulk of a concrete mixture. Sand, natural gravel, and crushed stone are used mainly for this purpose. Recycled aggregates (from construction, demolition, and excavation waste) are increasingly used as partial replacements for natural aggregates, while a number of manufactured aggregates, including air-cooled blast furnace slag and bottom ash are also permitted.Coarse aggregate for concrete By selection of the type of aggregate, concrete can be made, concrete can be made with a wide range in weight from lightweight as low as 25 lb/ft to heavyweight up to about 350 lb/ft.Concrete made with lightweight aggregate Natural aggregates are natural sands and crushed rock sands. The aggregates of an artificial type are those from crushed brick and from blast furnace slag.Recycled crushed bricks Thank You for Your Attention!
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