0
Add your answer:
Earn +20 pts
What is the difference between concrete grade C35 and C35A?
The main difference between concrete grade C35 and C35A lies in their composition. C35 concrete is a standard concrete mix with a minimum strength of 35 megapascals (MPa), while C35A concrete is a special mix that includes air-entraining agents to improve workability and durability. The inclusion of air-entraining agents in C35A helps to increase the concrete's resistance to freeze-thaw cycles and reduce the risk of cracking. Overall, C35A is more suitable for applications where improved durability and workability are required.
What is the strength of concrete after 28 days?
The compressive strength of M25 concrete at 7 days will be between 6-7.5 N/mm2 .
What are the differences between cement mortar and concrete?
Cement mortar is a mixture of cement, fine aggregate and water.Concrete is a mixture of cement, fine aggregate, coarse aggregate and water.Generally, concrete have higher strength than cement mortar.
What is correlation between strength of mortar to strength of concrete?
mortar are mixing by sand & cement and concrete is mixing by cement, sand & stone
What is the difference between fc and fcu in concrete?
f ′c: concrete compressive strength at 28 days (compression is negative) fcu: concrete crushing strength (compression is negative)
Meaning of hydration in concrete?
Hydration in concrete refers to the chemical reaction between water and cement which causes the mixture to harden and gain strength. This process is crucial for the development of the concrete's properties and durability. Proper hydration is necessary to ensure the concrete reaches its desired strength and durability.
Will happen to the strength of the concrete if impurities such as clay and silt occur in the sand?
The impurities like clay and silt in sand can reduce the strength of concrete by weakening the bond between the cement and aggregates. This can lead to an increase in voids in the concrete mixture, reducing its structural integrity and overall durability. It is important to use clean and well-graded sand to maintain the desired strength of the concrete.
What is the relation between tensile strength and compression strength in concrete?
tensile strength is approximately between .08 to .15 of compression strength in concrete
What is the differences between C30 Concrete and C40?
The number relates to the compressive strength of a cube of concrete when tested (i.e. 30 N/mm2 or 40N/mm2) The higher the number the greater the strength of the concrete. The choice of concrete grade is usually made at the design stage for the strucutre and effects the overall strength and resistance of the strucutre to decay. You would use a higher strength concrete in a more exposed environment. It is important to use the concrete grade specified for the proposed strucutre.
What is hydration of concrete?
Hydration of concrete is a chemical reaction that occurs between cement and water, resulting in the formation of bonds between cement particles and aggregates. This process is essential for the concrete to harden and develop its strength and durability over time. Proper hydration is crucial for achieving desired concrete properties and ensuring long-term performance.
What is the Equivalent cube strength of concrete over cylinder strength of concrete Any conversion between cube and cylinder strengths?
Cylindrical strength = 85% of Cube strength.
What is the strength of concrete after 28 days?
The compressive strength of M25 concrete at 7 days will be between 6-7.5 N/mm2 .
What are the differences between cement mortar and concrete?
Cement mortar is a mixture of cement, fine aggregate and water.Concrete is a mixture of cement, fine aggregate, coarse aggregate and water.Generally, concrete have higher strength than cement mortar.
What is correlation between strength of mortar to strength of concrete?
mortar are mixing by sand & cement and concrete is mixing by cement, sand & stone
What is the difference between fc and fcu in concrete?
f ′c: concrete compressive strength at 28 days (compression is negative) fcu: concrete crushing strength (compression is negative)
What is the effect of sugar in concrete?
Adding sugar to concrete can help to improve workability and slow down the setting time. However, it can also reduce the strength and durability of the concrete in the long run due to potential issues with carbonation and decreased bonding between cement particles. Overall, it is not recommended to use sugar as an additive in concrete unless in specific situations where these effects are desired.
Is epoxy required in rebar connections?
No, epoxy is not required in rebar connections. However, epoxy can be used to enhance the bond between the rebar and concrete in critical applications where higher strength and durability are needed.
