Why does the modulus of elasticity of concrete reduce with time?
First, you must determine WHAT you are going to store and HOW it will react to the material the tank is made from. i.e. a water storage tank just may be made from something different than concentrated sulfuric acid. Next, you need to take into consideration the quantity to be stored which will yieldRead more
First, you must determine WHAT you are going to store and HOW it will react to the material the tank is made from. i.e. a water storage tank just may be made from something different than concentrated sulfuric acid.
Next, you need to take into consideration the quantity to be stored which will yield the weight and the pressure forces put on the floor and the sides of the tank. This will tell you how strong the tank needs to be in thickness and reinforcement structures.
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CB Sowmya
The Modulus of Elasticity reduces with time because of the effect of creep. Creep is the phenomenon that occurs in hardened concrete over time, where for constant load or stress, deformation increases. Keeping that in mind, let us look at the definition of modulus of elasticity of concrete. It is thRead more
The Modulus of Elasticity reduces with time because of the effect of creep. Creep is the phenomenon that occurs in hardened concrete over time, where for constant load or stress, deformation increases.
Keeping that in mind, let us look at the definition of modulus of elasticity of concrete. It is the slope of the initial tangent modulus of the stress-strain curve of concrete.
The above graph shows the stress-strain curve of the concrete at an early stage.
Due to creep, for a given load/stress, deformation increases, thereby strain increases. This has been explained in the following graph.
As a result, the slope of the curve reduces and becomes like this.
As the curve descends, the slope of the initial tangent modulus of the stress-strain curve of concrete reduces.
As a result, the modulus of elasticity also reduces.
Thank you!
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