1. It ist not really good, but it is cheap.
2. It is called good in compression, because it is much worse in tension.
1. It ist not really good, but it is cheap.
2. It is called good in compression, because it is much worse in tension.
Concrete is a complex composite material and the properties depends on various parameters. The atomic structure of Calcium Silicate Hydrate (product obtained by adding cement and water) and aggregates (coarse and fine) play a vital role in the compressive and tensile behaviour of concrete.
When cement added with water becomes good binding material, cement consists of calcium and aluminium silicates with lose bonding property when it react with hydrogen in water and natural silicates in sand and gravel give high bonding, in other words ' cement in powdered state has open cycle bonding so it is not rigid when it react with hydrogen and silicates it forms a closed cycle bonding, these bonding provides the concrete high compression strength.
Concrete is good at compressing, because it is much worse in tension.
In Concrete, aggregates are glued together by cement Paste (cement + water). If compressive load is applied, transfer of load from one aggregate to another takes place through Inter facial Transition Zone (ITZ), for which strength required is minimum. If tensile load is applied, ITZ should be strong enough to hold the aggregates together. (Ref to attachment)
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