1
GATE CE 2015 Set 1
MCQ (Single Correct Answer)
+1
-0.3
Consider the following statements for air-entrained concrete:

(i) Air-entrainment reduces the water demand for a given level of workability

(ii) Use of air-entrained concrete is required in environments where cyclic freezing and thawing is expected.

Which of the following is TRUE?
A
Both (i) and (ii) are True
B
Both (i) and (ii) are False
C
(i) is True and (ii) is False
D
(i) is False and (ii) is True
2
GATE CE 2014 Set 2
Numerical
+1
-0
The flexural tensile strength of M25 grade of concrete, in N/mm2, as per IS:456-2000 is __________.
Your input ____
3
GATE CE 2014 Set 2
MCQ (Single Correct Answer)
+1
-0.3
The target mean strength fcm for concrete mix design obtained from the characteristic strength (fck) and standard deviation $$\sigma$$, as defined in IS:456-2000, is
A
$${\mathrm f}_\mathrm{ck}\;+\;1.35\mathrm\sigma$$
B
$${\mathrm f}_\mathrm{ck}\;+\;1.45\mathrm\sigma$$
C
$${\mathrm f}_\mathrm{ck}\;+\;1.55\mathrm\sigma$$
D
$${\mathrm f}_\mathrm{ck}\;+\;1.65\mathrm\sigma$$
4
GATE CE 2014 Set 2
MCQ (Single Correct Answer)
+1
-0.3
The modulus of elasticity, E = 5000$$\sqrt{{\mathrm f}_\mathrm{ck}}$$ where fck is the characteristic compressive strength of concrete, specified in IS:456-2000 is based on
A
Tangent modulus
B
Initial tangent modulus
C
Secant modulus
D
Chord modulus
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