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Concrete grades are classifications that indicate the strength of the concrete mix used in construction.
Concrete grades are denoted by the letter 'M' followed by a number, such as M20, M30, etc.
The number after 'M' represents the compressive strength of concrete in N/mm^2 after 28 days of curing.
Higher grade numbers indicate higher strength concrete, suitable for different types of construction projects.
For example, M2...
Concrete strength typically reaches about 70-80% of its final strength after 7 days.
Concrete strength gain after 7 days is usually around 70-80% of its final strength
Factors such as mix design, curing conditions, and type of cement can affect the rate of strength gain
For example, high early strength concrete may reach higher percentages of its final strength after 7 days compared to normal concrete
Non destructive testing of concrete is a method used to evaluate the properties of concrete without causing damage.
Methods include ultrasonic testing, rebound hammer, and ground penetrating radar.
These tests help assess the strength, durability, and quality of concrete structures.
Non destructive testing is essential for ensuring the safety and longevity of buildings and infrastructure.
Examples of non destructive testin...
Transportation of concrete involves mixing, loading, and delivering the concrete to the construction site.
Concrete is mixed at a batching plant using cement, sand, gravel, and water.
The mixed concrete is then loaded into transit mixers or concrete trucks for transportation.
Transit mixers rotate to prevent the concrete from setting during transportation.
Concrete pumps can also be used to transport concrete to hard-to-re
Admixtures are used in ready mixed concrete to improve workability, durability, and strength.
Admixtures help in reducing water content while maintaining workability.
They enhance the durability of concrete by reducing permeability and increasing resistance to chemicals.
Admixtures can also accelerate or retard the setting time of concrete.
Examples of admixtures include water reducers, accelerators, retarders, and air-ent
I applied via Walk-in and was interviewed in Jun 2022. There were 2 interview rounds.
I applied via Approached by Company and was interviewed in May 2022. There were 4 interview rounds.
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I applied via Naukri.com and was interviewed in Apr 2022. There were 2 interview rounds.
posted on 14 Oct 2023
I applied via Naukri.com and was interviewed in Sep 2023. There were 3 interview rounds.
Some concrete tests include slump test, compressive strength test, and water absorption test.
Slump test measures the consistency and workability of fresh concrete.
Compressive strength test determines the strength of hardened concrete.
Water absorption test assesses the porosity of concrete.
Ultrasonic pulse velocity test measures the quality of concrete by assessing its homogeneity and detecting defects.
Rebound hammer te...
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I applied via Naukri.com and was interviewed in Mar 2022. There was 1 interview round.
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