Shrinkage of concrete can be classified into the following categories: 1. Plastic Shrinkage 2. Drying Shrinkage 3. Autogeneous Shrinkage 4. Carbonation Shrinkage. 1. Plastic Shrinkage: Plastic shrinkage takes place, soon after the concrete is placed in the form work, while the concrete is still in plastic stage. The cement paste at this stage un-goes a volumetric contraction. The magnitude of [...]
Shrinkage of hardened concrete is influenced by various factors in a similar manner as that of creep under drying conditions. These factors are: 1. Aggregate Content 2. Quality of Cement Paste 3. Water Content 4. Properties of Cement 5. Chemical Composition of Cement 6. Effect of High Alumina Cement 7. Entertainment of Air 8. Effect of Admixtures 9. Effect of [...]
Concrete undergoes deformation due to the applied stress. But in addition to this, volume changes due to shrinkage, and temperature variations also take place. In practice these variations are of considerable importance as these movements partly or wholly are restrained and thus they introduce stress. These volume changes affect the long term strength and durability of concrete. Though shrinkage, swelling [...]