What is creep in bridge?
Creep affects the setting of bearings and the size of sliding plates or laminated bear- ing pads, it affects the size and setting of expansion joints, and it affects the amount of girder shortening due to pre- stress and the corresponding loss of pre- stress, thereby also affecting the sec- ondary moments in a …
What is shrinkage and creep?
In shrinkage, the loss is due to difference in the relative humidity of concrete and the environment, in creep it is due to sustained applied stress. Second, the strain-time curves of both the phenomenon are very similar. The factors that effect creep also effects shrinkage.
Why shrinkage and creep treated together?
After unloading, creep recovery takes place, but it is partial, because of aging. In practice, creep during drying is inseparable from shrinkage. The rate of creep increases with the rate of change of pore humidity (i.e., relative vapor pressure in the pores).
What are the factors affecting creep and shrinkage?
The factors that affect creep of concrete are similar to the factors affecting shrinkage, which are as following:
- Water-cement Ratio: The rate of creep is increased with increasing water cement ratio.
- Humidity: It is influenced by humidity and drying condition of the atmosphere.
- Age Of Concrete:
- Aggregate:
- Admixtures:
What is shrinkage deformation?
Autogenous deformation is quite early shrinkage of concrete caused by loss of water from capillary pores due to the hydration (without the environmental loss of water). It tends to increase at lower values of water-to-cement (W/C) ratio or at a higher cement contents.
What is shrinkage strain?
The shrinkage represents a time dependent deformation which reduces the volume of concrete, without the impact of external forces.
What are the types of shrinkage?
Types of Shrinkage in Concrete Plastic Shrinkage. Drying Shrinkage. Autogenous Shrinkage. Carbonation Shrinkage.
What are three factors that affect creep?
The amount of creep that the concrete undergoes is dependent upon 1) the magnitude of the sustained loading, 2) the age and strength of the concrete when the stress is applied, and 3) the total amount of time that the concrete is stressed.
What are the factors of creep defect?
The magnitude of creep is dependent upon the magnitude of the applied stress, the age and strength of the concrete, properties of aggregates and cementitious materials, amount of cement paste, size and shape of concrete specimen, volume to surface ratio, amount of steel reinforcement, curing conditions, and …
What is creep in structure?
In more practical terms, creep is the increased strain or deformation of a structural element under a constant load. Depending on the construction material, structural design, and service conditions, creep can result in significant displacements in a structure.
What is creep in reinforced concrete?
Concrete creep is defined as: deformation of structure under sustained load. Basically as long term pressure or stress on concrete can make it change shape. This deformation usually occurs in the direction the force is being applied. Like a concrete column getting more compressed, or a beam bending.
What are the two types of shrinkage?
ADVERTISEMENTS: Shrinkage of concrete can be classified into the following categories: 1. Plastic Shrinkage 2. Drying Shrinkage 3.