Home › B.Tech Civil › civilengineering › Strength of Concrete › Per §7.2 ('Age of Concrete'), in the Accelerated…
Per §7.2 ('Age of Concrete'), in the Accelerated Curing Test the cast and moist-cured cubes are then placed in a tank where they are exposed to boiling water for approximately:
A{'text': '10 minutes', 'label': 'A'}
B{'text': '1 hour', 'label': 'B'}
C{'text': '3 hours', 'label': 'C'}
D{'text': '24 hours', 'label': 'D'}
Answer & Solution
Correct answer: C. {'text': '3 hours', 'label': 'C'}
1. §7.2 reads: 'Concrete… is cast in conventional manner… and kept for 24 hours in moist environment… The tank is closed and heating system is switched on. Boiling temperature is achieved in 30 minutes followed by 3 hrs boiling and subsequent cooling in 30 minutes.'
2. The calibration curve between accelerated strength and 28-day strength is given by IS 9013.
_Source: IGNOU ET-522 Block-2 Unit-7 Strength of Concrete, §7.2, p. 49_
Related questions
Per §7.6.4, the three types of shrinkage recognised in hardened-concrete deformation are:Per §7.6.3, the physical mechanism most often cited for creep deformation in concrete is:Per §7.6.3, if the creep deformation at 1 year is taken as unity, the source quotes the rePer §7.6.3, creep of concrete is best defined as the:Per §7.6.2, the modulus of elasticity of concrete typically scales approximately as which Per §7.6.1, the dynamic modulus of elasticity of concrete determined by ultrasonic-pulse /Per §7.6.1, for practical design, concrete may reasonably be treated as a linear-elastic mPer §7.6.1, in the standard determination of the Modulus of Elasticity the cylindrical con