Addis Abeba University, School of Civil and Environmental Engineering
Cotem MSC Program: Concrete Construction
Questionary
CONCRETE BATCHING, MIXING TRANSPORTING AND HANDLING
Name of Organization _________________________________________________
Construction Type Residential Building Commercial
Real Estate Governmental Project
Road construction Airport/Runway
Others (Specify) ________________________________
Town of the construction site_____________________ Special name of the site location________________
Project size (Describe) _______________________________________________________________
Project Amount in ETB (Estimate) __________________
Q1. What method do you use for batching of concrete aggregates?
1) By traditional box size 2) self-loading of batching with truck mixer
3) Loading Equipment (Loader, excavator) 4) electronic batching system
Q2. If the batching is with hand or equipment, how do you control the accuracy of exact quantity as per the
concrete mix design?
2) Labours or operators are in charge 2) quality control personnel in charge
3) Random control of the batching quantity system in place 4) Other methods
Q3. How do you mix concrete for the construction?
1) Hand mixing with shovel 2) Stationery concrete mixer
3) Batching and truck mixer 4) Concrete batching and mixing Plant
Q4. For batching and mixing concrete, what parameters are used?
1) Conventional 1:2:3 ratio of Cement :sand: aggregate
2) Cement, fine and coarse aggregate and water amount
3) Cement, fine and coarse aggregate, water amount and Slump
4) Cement, fine and coarse aggregate, water amount, Cement type and Slump
This questioner is purely for Academic purpose and its confidentiality is guaranteed
Addis Abeba University, School of Civil and Environmental Engineering
Cotem MSC Program: Concrete Construction
Questionary
1) Cement, course and fine aggregate proportion, water amount, slump,
Q5. Do you use or ever used a ready mix concrete(RMC)?
1) We use always 2) sometimes during peak requirement as a compliment
3)Never used
Q6. If you have used a ready mix concrete as replied in Q5, how did you rate the quality of concrete with
respect to concrete compressive test result, consistency, time of delivery, cost etc?
1) Is perfect and It is of exact quality from the mix design
2) Satisfactory
3) Fair with constant deviation from the mix design
4) Poor in quality, consistency and time of delivery
Q7. If you have used Ready mix concrete, how do you find the cost of the Ready mix concrete with
relative to on site mixing?
1) Very economical 2) fair
3)Costly 4)cost not properly
Q8. Do you adjust the water that is used for concrete mixing depending on the natural moisture content of
aggregate?
1) No we don’t adjust , it is fixed unit
2) Yes we adjust the water according to the moisture content of the aggregates
Q9. Do you use Admixtures for concrete, if you don’t use skip this question. If you use, please specify the
type
1) Plasticizer 2) super plasticized 3) Accelerator
4) Water reducing 5) retarder 6) other (Specify)___________________
Q10. What is the maximum Volume of concrete you casted in a single day in m3 unit
1) 5-10, 2) 10-50
2) 50-100 4)more than 100m3 5) have no recorded data
This questioner is purely for Academic purpose and its confidentiality is guaranteed
Addis Abeba University, School of Civil and Environmental Engineering
Cotem MSC Program: Concrete Construction
Questionary
Q11. How much concrete is produced in a single mixing batch?
1) Less than 1m3 2) 1-2 m3
3)2-4m3 4) more than 4 m3
Q12. For how long is a single batch mixed
1) Less than 1min 2) 1-3 min
3) 3-6 min 4) more than 6 minute
Q13. Do you run slump test or vibe test for your concrete?
1. Yes we use 2. no we don’t use
Q14. If your answer in Q13 is yes, how frequently
1) For every concrete mixed batch 2) once for every 2 to 3 batch
3)Once for a daily production output 4) randomly
Q15. As per the response on Q13, how do you maintain concrete consistence if the slump is above or
below the specified
1 Adjust by adding water if slump is lower or cement slurry if slump is higher
2. Use the concrete with whatever the slump is and correct in the next batch
3. Reject the concrete of the batch and mix a new one
Q16. How is the concrete transported horizontally to the casting place?
1) By manpower (Labour) 2) wheel barrow or similar hand machine
3)With loading Machine 4) truck mixer concrete pump
Q15. How is the concrete transported vertically to the casting place?
1) By manpower (Labour) 2) with hoisting wrench and/or tower crane
3)With loading Machine 4) truck mixer and concrete pump
Q16. What is the average time you record from start of concrete mixing to transportation, casting and
finishing?
1) Less than 30 min. 2) 30-60min
3)60-90min 4)90-120min 5) mostly 120min and above
This questioner is purely for Academic purpose and its confidentiality is guaranteed
Addis Abeba University, School of Civil and Environmental Engineering
Cotem MSC Program: Concrete Construction
Questionary
Q17. During transportation how do you control water loss from the concrete, how do you compensate for
water loss
1) Cover concrete with canvas to avoid water loss
2) Shorten transportation distance
3) Use favorable time of the day to reduce water loss
4) Not a concern, we cast the concrete direct from the mixing site.
Q18. Describe in general your evaluation on your construction site the method of concrete batching,
mixing transporting and handling.
-------------------------------------------------------------------------------------------------------------------------
Signature of the volunteer filling the questionary _________________________
In the capacity of __________________________________
This questioner is purely for Academic purpose and its confidentiality is guaranteed
Addis Abeba University, School of Civil and Environmental Engineering
Cotem MSC Program: Concrete Construction
Questionary
Photograph Attachment with description
This questioner is purely for Academic purpose and its confidentiality is guaranteed
