Concrete Technology Questions

• Cement used for normal concrete construction, is obtained by burning a mixture of
• Permissible compressive strength of M 200 concrete grade is
• The 28 days cube strength of mass concrete using aggregates of maximum size 5 cm for gravity dams should be
• Strength of concrete with passage of time
• Setting time of cement increases by adding
• A flaky aggregate is said to be elongated if its length is
• Higher workability of concrete is required if the structure is
• If P, Y and Z are the weights of cement, fine aggregates and coarse aggregates respetively and W/C is the water cement ratio, the minimum quantity of water to be added to first batch, is obtained by the equation
• Expansion joints are provided if the length of concrete structures exceeds
• According to IS : 382-1963, a good aggregate should be
• An aggregate which passes through 25 mm I.S. sieve and is retained on 20 mm sieve, is said to be flaky if its least dimension is less than
• Vicat apparatus is used for
• If fineness modulus of sand is 2.5, it is graded as
• For the construction of the retaining structures, the type of concrete mix to be used, is
• Pozzolanic properties exist in
• If aggregates completely pass through a sieve of size 75 mm and are retained on a sieve of size 60 mm, the particular aggregate will be flaky if its minimum dimension is less than
• Workability improved by adding
• The dimensions of a 35 litre forma for measuring aggregates by volume, are :
• For the construction of thin R.C.C. structures, the type of cement to be avoided, is
• Pick up the correct statement from the following: