Civil Engineering - Structural Design Specifications - Discussion
Discussion Forum : Structural Design Specifications - Section 1 (Q.No. 28)
28.
The maximum compressive strength on 15 cm cubes of M 20 grade concrete at 7 days, should be a minimum of
Discussion:
13 comments Page 1 of 2.
Suresh said:
4 years ago
For 3 days = 30 percent,
For 7 days = 67.7 percent,
For 14 days = 90 percent,
For 28 days = 99 percent,
So, the answer is 13.5 min.
For 7 days = 67.7 percent,
For 14 days = 90 percent,
For 28 days = 99 percent,
So, the answer is 13.5 min.
(5)
Emad nayef said:
5 years ago
The maximum compressive strength on 15 cm cubes of M 20 grade concrete at 7 days must be min 13.5, so the nearest answer is 15 (C).
(2)
Ankit oza said:
6 years ago
In case of M20,
7th-day strength shall be:
20 * 0.65 = 13 N/Sqmm.
7th-day strength shall be:
20 * 0.65 = 13 N/Sqmm.
(1)
Barish Raut said:
10 years ago
The answer seems to be wrong. Concrete achieves 65% strength in 7 days. Characteristic compressive strength of M20 Grade Concrete is 20N/mm2. So 65% of 20 = 13N/mm2.
ANBARASAN said:
9 years ago
Which is correct? @Barish Raut.
PRABHU said:
8 years ago
The Answer should be 15.
Chhaya said:
8 years ago
According to me, the Concrete achieve 66.666% strength So the answer is 13.24.
Roy said:
8 years ago
Yes, for M15 grade, it is 10 n/mm^2.
Chandrakant said:
7 years ago
67% is 70% approx.
Hence 14N/mm2 answer should be 15.
Hence 14N/mm2 answer should be 15.
Manohar said:
7 years ago
According to me, the answer is 13.
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