ALLInterview.com :: Home Page            
 Advertise your Business Here     
Browse  |   Placement Papers  |   Company  |   Code Snippets  |   Certifications  |   Visa Questions
Post Question  |   Post Answer  |   My Panel  |   Search  |   Articles  |   Topics  |   ERRORS new
   Refer this Site  Refer This Site to Your Friends  Site Map  Bookmark this Site  Set it as your HomePage  Contact Us     Login  |  Sign Up                      
info       Did you received any Funny E-Mails from your Friends and like to share with rest of our friends? Yeah!! you can post that stuff   HERE
Google
   
 
Categories  >>  Engineering  >>  Civil Engineering
 
 


 

 
 Civil Engineering interview questions  Civil Engineering Interview Questions
 Mechanical Engineering interview questions  Mechanical Engineering Interview Questions
 Electrical Engineering interview questions  Electrical Engineering Interview Questions
 Electronics Communications interview questions  Electronics Communications Interview Questions
 Chemical Engineering interview questions  Chemical Engineering Interview Questions
 Aeronautical Engineering interview questions  Aeronautical Engineering Interview Questions
 Bio Engineering interview questions  Bio Engineering Interview Questions
 Metallurgy interview questions  Metallurgy Interview Questions
 Industrial Engineering interview questions  Industrial Engineering Interview Questions
 Instrumentation interview questions  Instrumentation Interview Questions
 Automobile Engineering interview questions  Automobile Engineering Interview Questions
 Mechatronics Engineering interview questions  Mechatronics Engineering Interview Questions
 Marine Engineering interview questions  Marine Engineering Interview Questions
 Power Plant Engineering interview questions  Power Plant Engineering Interview Questions
 Engineering AllOther interview questions  Engineering AllOther Interview Questions
Question
How do we calculate the weight of aggregates, sand and 
cement M 25 design mixfor 1 cum
 Question Submitted By :: Laxma Reddy
I also faced this Question!!     Rank Answer Posted By  
 
  Re: How do we calculate the weight of aggregates, sand and cement M 25 design mixfor 1 cum
Answer
# 1
. REQUIREMENTS
a) Specified minimum strength = 20 N/Sq mm

b) Durability requirements
i) Exposure Moderate
ii) Minimum Cement Content = 300 Kgs/cum

c) Cement
(Refer Table No. 5 of IS:456-2000)
i) Make Chetak (Birla)
ii) Type OPC
iii) Grade 43

d) Workability
i) compacting factor = 0.7

e) Degree of quality control Good

2. TEST DATA FOR MATERIALS SUPPLIED
a) CEMENT
i) Specific gravity = 3.05
ii) Avg. comp. strength 7 days = 46.5 more than 33.0 OK
28 days = 55.0 more than 43.0 OK

b) COARSE AGGREGATE
i) 20mm Graded
Type Crushed stone aggregate
Specific gravity = 2.68
Water absorption = 1.46
Free (surface) moisture = 0



c) FINE AGGREGATE (Coarse sand)
i) Type Natural (Ghaggar)
Specific gravity = 2.6
Water absorption = 0.5
Free (surface) moisture = 1.4



3. TARGET MEAN STRENGTH (TMS)
a) Statistical constant K = 1.65
b) Standard deviation S = 4.6
Thus, TMS = 27.59 N/Sqmm

4. SELECTION OF W/C RATIO
a) As required for TMS = 0.5
b) As required for ‘Moderate’ Exposure = 0.55
Assume W/c ratio of 0.5

5. DETERMINATION OF WATER & SAND CONTENT
For W/C = 0.6
C.F. = 0.8
Max. Agg. Size of 20 mm
a) Water content = 186 Kg/cum
b) Sand as percentage of total aggregate by absolute
volume = 35 %

Thus,
Net water content = 180.42 Kg/cum
Net sand percentage = 33 %



6. DETERMINATION OF CEMENT CONTENT
W/c ratio = 0.5
Water content = 180.42 Kg/cum
Thus, Cement content = 360.84 Kg/cum Adequate for moderate
exposure Say 360 Kg/cum

7. DETERMINATION OF COARSE AND FINE AGGREGATE CONTENT
Assume entrapped air as 2 %
Thus,
0.98 cum = [180.42+360/3.05 + {1/0.33}*{fa/2.6}]/1000
& 0.98 cum = [180.42+360/3.05 + {1/0.67}*{Ca/2.68}]/1000
Hence,
fa = 584 Kg/cum
Ca = 1223.8 Kg/cum

The final mix proportions of M-20 grade of concrete become:-



Note: 1 The above recommended mix design must be verified,
by actual cube tests.
2 The mix design is based on the quality and grading of
the materials actually supplied, by the client.
Any variation in quality and gradation will result in
changes in the mix design
 
Is This Answer Correct ?    1 Yes 1 No
Sjtbehera
[Hari Machines]
 

 
 
 
Other Civil Engineering Interview Questions
 
  Question Asked @ Answers
 
MEAN OF M25 CONCRETE L&T4
I heard Thump rule about beam depth is 1" per 1' length. Is this correct? If not please tell me the thump rule.Thanks.  2
how do you estimate the # of bags of cement, sand & gravel.. if only given the volume of the project..  3
whats the field test of cement,aggregate and water  6
9*9 1:4:8 ratio using how to calculate the material for 40mm aggregate ,cement &sand please tell me answer  4
how lap length is increased with increase of Grade of steel?  1
how to calculate the lap bar for bor culvert ?  1
state and explain in Water absorption of brick  11
what is the standard mix proportion of m60 grade?  2
6mm dia rod legth 1feet  3
which I.S. code shown wastage in structural steel  1
which size of box use of cement,sand,aggregate to use the m 20 concrete. i know the quantity of material cement 400 kg or 8 beg ,662 kg sand and 1200 kg aggregate. i can use only 1 beg cement so pls give me answer . thx in advance HCC3
 
For more Civil Engineering Interview Questions Click Here 
 
 
 
 
 


   
Copyright Policy  |  Terms of Service  |  Help  |  Site Map 1  |  Articles  |  Site Map  |   Site Map  |  Contact Us interview questions urls   External Links 
   
Copyright © 2012  ALLInterview.com.  All Rights Reserved.

ALLInterview.com   ::  Forum9.com   ::  KalAajKal.com