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Introduction to Concrete


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It Basically tells about the major topics related to Concrete.

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Introduction to Concrete

  2. 2. • Is a mixture of cement , water, aggregates , and in some cases, admixtures. • The cement and water form a paste that hardens and bonds the aggregates together. • It can be placed or molded into virtually any shape and reproduce any surface texture.
  3. 3. • Cement • Aggregate- sand, gravel, crushed rocks • Water • Admixtures- when necessary
  4. 4. • Cement is a binder, a substance used in constructions that sets and hardens and can bind other materials together
  5. 5. • Aggregates occupy 60-70 % of the volume of concrete. • Sand, gravel and crushed stone are the primary aggregates used. • All aggregates must be essentially free of silt and organic matter.
  6. 6. • Good water is essential for quality concrete. • It should be good enough to drink, free of organic matter and excessive chemicals or minerals. • The strength and other properties of concrete are highly dependent on the amount of water and the water-cement ratio.
  7. 7. • Admixtures are ingredients other than cement, water, and aggregates. • Admixtures are added to the concrete mixtures immediately before or during mixing.
  8. 8. • Are used to slow the rate of concrete hardening. • They are useful for concrete that is placed during hot weather.
  9. 9. • Are used to increase the rate of concrete hardening. • They are useful for concrete that is placed during cold weather.
  10. 10. • With proper materials and techniques, concrete can withstand many acids , fertilizers, water, fire, and abrasion. • Concrete can be finished to produce surface ranging from glass-smooth to coarsely textured, and it can be colored with pigments or paints.
  11. 11. • Concrete has substantial strength in compression, but it week in tension. • Most structural uses, such as beams, slats, and manure tank lids, involve reinforced concrete, which depends on concrete’s strength in compression and steel’s strength in tension.