# Civil Engineering - RCC Structures Design - Discussion

### Discussion :: RCC Structures Design - Section 1 (Q.No.25)

25.

The minimum cube strength of concrete used for a prestressed member, is

 [A]. 50 kg/cm2 [B]. 150 kg/cm2 [C]. 250 kg/cm2 [D]. 350 kg/cm2 [E]. 400 kg/cm2

Explanation:

No answer description available for this question.

 Sachin Kumar said: (Oct 22, 2014) M35 is minimum required concrete for prestressed concrete. Here 35 is in N/mm2. So convert it into kg/cm2. N/mm2 = 10 kg/cm2. So 35 N/mm2 = 350 Kg/cm2. So OPTION [D] IS CORRECT.

 Mohit said: (Jul 25, 2015) But in presented concrete min grade of concrete used is M40.

 Piyush Singh said: (Sep 3, 2015) For Post tensioning work minimum grade of concrete as specified in IS 1343 is M35, while for Pre-tension prestressed work grade of concrete specified in IS 1343 is M40. Clause 6.1 Table 1 IS 1343.

 Saksham said: (Nov 12, 2015) Answer is incorrect min grade for pretension is m-40.

 Avinash said: (Apr 29, 2016) How to calculate 350 Kg/cm2? Please explain the solution.

 Kuldeep said: (Jul 31, 2016) What minimum bread of concrete used in RCC?

 Saurav said: (Aug 24, 2016) Minimum grade for pre stressed M45 & post stressed M-35.

 Irfan Khan said: (Sep 16, 2016) Right @Saksham. The min grade of concrete for pre tension is m40.

 Sudhakar said: (Dec 8, 2016) M35 for Post-tensioned concrete. M40 for Pre-tensioned concrete.

 Suriya said: (Dec 16, 2016) Pre-tensioned and post-tension is the type of prestress beam. So, the minimum concrete grade is option D = 350 kg/cm2.

 Binosh said: (Mar 18, 2017) Prestressing losses in post-tensioned and pre-tensioned beams are respectively. A) 15% and 20% b) 20% and 15% C) 15% and 15% d) 20% and 20%. Please tell me the answer.

 Akshay said: (Apr 9, 2017) @Binosh. It is (a). In post, tension losses are less.

 Makar said: (Apr 26, 2017) This option is correct min grade 35.

 Debojyoti said: (May 5, 2017) I think E is the correct answer.

 Bhaskar Manna said: (May 18, 2017) It is not clear from the question whether the prestressed concrete is pre-tension or post-tension. If pre-tension = 40 N/mm2. Post-tension = 35 N/mm2.

 Puni said: (Sep 4, 2017) Pre-tension = 40 N/mm2. Post-tension = 30 N/mm2.

 Krishna said: (Sep 8, 2017) Minimum grade for pre-tension - M40. Minimum grade for post-tension - M35.

 Yogesh said: (Sep 23, 2017) What is maximum grade can be used?

 Paddy said: (Dec 3, 2017) Pre Tension = M40. Post Tension = M30.

 Chintan said: (Feb 25, 2018) As per new code 2012 above answer is correct.

 Farhan Beigh said: (Mar 17, 2018) Pretensioning is 40N/mm2 and post tensioning is 30N/mm2.

 Mannu said: (Apr 1, 2018) As per is code, m40 is min grade for prestress so answer should be 400.

 Chander said: (May 25, 2018) Yes, right @Sudhakar @Paddy.

 V Yafav said: (May 30, 2018) M35 exposed to the sea coast and for submerged or partially M40 uses.

 Mantu said: (Aug 6, 2018) Prestressed - minimum 35& maximum -40grade of concrete is used. So, 35N/mm^2 or 350kg/cm^2 is correct.

 Prashant said: (Aug 16, 2018) Here question is prestresses concrete not pre or pro-tension so, option 4 is right.

 Aushutosh said: (Aug 31, 2018) The Average of pre & post is taken here.

 Ashok said: (Oct 23, 2018) Pre 40 and post 30.

 Viru Kapoor said: (Nov 1, 2018) Concrete grade used for post tension M30. Pretensioning M40.

 Ratandeep said: (Jul 25, 2019) @Binosh. The answer is A.

 Tanmoy Karmakar said: (Nov 8, 2019) For Post Tension Minimum Grade M30 and For Pre Tension Minimum Grade M40. So the Answer is 300 kg/cm square.