By Alexander, Mark Mindess, Sidney
Bringing jointly in a single quantity the most recent learn and knowledge, this ebook presents a detailed consultant to the choice and use of aggregates in concrete. After an advent defining the aim and function of aggregates in concrete, the authors current an outline of combination resources and creation options, via an in depth research in their actual, mechanical and chemical houses. this data is then utilized to using aggregates in either plastic and hardened concretes, and within the total combine layout. exact aggregates and their functions are mentioned intimately, as are the present major requirements, criteria and exams.
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Extra info for Aggregates in Concrete (Modern concrete technology series 13)
Rock types for concrete aggregates Gneiss Hornfels Marble Quartzite (Metaquartzite) Schist, Slate, and Phyllite (preferably not used as concrete aggregates) Distinguishing characteristics and features Metamorphic rocks formed under both high temperature and pressure show massive internal structures and equigranular texture, often resulting in great strength and toughness, for example quartzite and hornfels. Metamorphosed igneous rocks: properties are not usually greatly improved by metamorphism.
Hard rock quarries As sources of granular deposits become depleted, particularly adjacent to areas of high demand such as urban centres, other sources of aggregates must be found. One source is recycled materials, dealt with in Chapter 7. Another is hard rock which is quarried and crushed. In some countries or regions, these materials are the only reasonable source of quality aggregates for concrete and have been used for many decades (Grieve, 2001). 7. It is possible to produce both coarse and fine aggregates from hard rock quarries.
In this sense weathering can be thought of as a process that produces concrete aggregates, sands in particular. Sands tend to be dominated by quartz, with feldspar, mica, and iron oxide as less abundant phases. Quartz is a hard, chemically stable mineral and is a desirable component of concrete sand. Feldspars are less stable and may experience decomposition resulting in the formation of clay minerals. Some sands may contain minerals of high relative density such as garnet, zircon, rutile and ilmenite which 26 Natural aggregate sources and production do not usually affect the behaviour of sand in concrete, provided they are present only in small amounts.