What Properties Harden Concrete should and should not have / Properties of Concrete at Harden State
In the 👉 Previous article we have learned the properties of fresh concrete, now we will know about the properties that harden concrete should and should not have.
After the final setting of concrete and sufficient curing of the concrete should achieve some specific properties to sustain the structure. Some of the properties that harden concrete should have are listed below –
- Comprehensive Strength :
Concrete at the Harden state must achieve minimum compressive strength to resist the stress coming on it and resist the heavy loads of the structure. Concrete is designed to achieve some strength category Like M15, M20, M25, M30 etc. (MX) where M stands for Mix and ‘X’ means compressive strength of concrete after 28 days of curing. In any case, the strength of Concrete should not be less than 15.5 N/mm2
2. Durability :
The Harden Concrete must be durable enough to resist the effects of harsh environmental like rain, forest action also wear and tear. The property of fresh concrete that has the most impact over Durability of concrete is water cement ration.
3. Impermeability :
Impermeability of concrete that property which makes the concrete water resistance i.e. resist the entry of water into the concrete and structure. Sometimes a water tightness criteria of concrete is enhanced with suitable admixture mixed with concrete.
Now let’s talk about the Properties of Harden concrete that it should not have –
- Shrinkage and Creep :
When fresh concrete undergoes the hardening process it has a tendency of reduction in its volume this results in shrinkage. Shrinkage is generally observed with the shrinkage crack which leads to the less bonding, less strength and finally failure of the structure.
The process of drying (like no curing) and high water-cement ration is the main reasons for shrinkage.
Creep is the deformation of the hardened concrete when it is subjected to continuous strain or by its own weight. Creep is a time dependence i.e. when concrete is undergone strain for a considerable period of time. Creep is observed by a deep crack in the concrete. Loading condition is generally responsible for creep.
2. Thermal Shrinkage :
Like every material concrete also expand in volume when it is subjected to heat, but harden concrete is not an elastic material so when it undergoes in the heat it cracks itself, also known as thermal shrinkage. The hardened concrete should have a minimum thermal expansion to resist fire and heat.
In the 👉 Previous article we have learned the properties of fresh concrete, now we will know about the properties that harden concrete should and should not have.
After the final setting of concrete and sufficient curing of the concrete should achieve some specific properties to sustain the structure. Some of the properties that harden concrete should have are listed below –
- Comprehensive Strength :
Concrete at the Harden state must achieve minimum compressive strength to resist the stress coming on it and resist the heavy loads of the structure. Concrete is designed to achieve some strength category Like M15, M20, M25, M30 etc. (MX) where M stands for Mix and ‘X’ means compressive strength of concrete after 28 days of curing. In any case, the strength of Concrete should not be less than 15.5 N/mm2
2. Durability :
The Harden Concrete must be durable enough to resist the effects of harsh environmental like rain, forest action also wear and tear. The property of fresh concrete that has the most impact over Durability of concrete is water cement ration.
3. Impermeability :
Impermeability of concrete that property which makes the concrete water resistance i.e. resist the entry of water into the concrete and structure. Sometimes a water tightness criteria of concrete is enhanced with suitable admixture mixed with concrete.
Now let’s talk about the Properties of Harden concrete that it should not have –
- Shrinkage and Creep :
When fresh concrete undergoes the hardening process it has a tendency of reduction in its volume this results in shrinkage. Shrinkage is generally observed with the shrinkage crack which leads to the less bonding, less strength and finally failure of the structure.
The process of drying (like no curing) and high water-cement ration is the main reasons for shrinkage.
Creep is the deformation of the hardened concrete when it is subjected to continuous strain or by its own weight. Creep is a time dependence i.e. when concrete is undergone strain for a considerable period of time. Creep is observed by a deep crack in the concrete. Loading condition is generally responsible for creep.
2. Thermal Shrinkage :
Like every material concrete also expand in volume when it is subjected to heat, but harden concrete is not an elastic material so when it undergoes in the heat it cracks itself, also known as thermal shrinkage. The hardened concrete should have a minimum thermal expansion to resist fire and heat.
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