🚧How to calculate the volume of sand , aggregate and cement in 1m^3 of concrete? Take c-20 concrete
Answer
Example c-20 mix design (1:2:3) if we are given 1 m^3 concrete
First we add up 1+2+3=6
Means 1 cement
2 sand
3 aggregate
To calculate the the volume of sand
1 * 2/6= 2/6 m^3 =0.33m^3
To calculate the volume of aggregate (gravel)
1 * 3/6 = 0.5m^3
To calculate the volume of cement
1 * 1/6 = 0.167m^3
To calculate cement in piece
1 bag of cement is 0.036m^3 so divide the quantity of cement with a bag of cement
Bag of cement = 0.167 / 0.036 = 4.6
So we use 5 bag of cement
@engineer03
Answer
Example c-20 mix design (1:2:3) if we are given 1 m^3 concrete
First we add up 1+2+3=6
Means 1 cement
2 sand
3 aggregate
To calculate the the volume of sand
1 * 2/6= 2/6 m^3 =0.33m^3
To calculate the volume of aggregate (gravel)
1 * 3/6 = 0.5m^3
To calculate the volume of cement
1 * 1/6 = 0.167m^3
To calculate cement in piece
1 bag of cement is 0.036m^3 so divide the quantity of cement with a bag of cement
Bag of cement = 0.167 / 0.036 = 4.6
So we use 5 bag of cement
@engineer03
#0year-experience
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Address: – Nefas silk Lafto Sub-City around Lebu Square in front of Samuel Building.
DMC Construction PLC
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@engineer03 @engineer03
JUNIOR SITE ENGINEER 3 APPLICATIONS
Address: Nefas silk Lafto Sub-City around Lebu Square in front of Samuel Building.
Full Time September 20, 2020 - October 3, 2020
JOB REQUIREMENT
Qualification: B.Sc. in Civil Engineering or in related filed
Relevant Experience: 1 years and above in road Construction
no.4
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HOW TO APPLY
Interested and qualified applicants who fulfill the above requirements are invited to submit their application and relevant documents to DMC CONSTRUCTION PLC Head Office in person or Send through our Postal
Address within 10 Working days.
Address: – Nefas silk Lafto Sub-City around Lebu Square in front of Samuel Building.
DMC Construction PLC
Human Resource & Administration Department P.O.Box 3647
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Interested and qualified applicants are invited to submit
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area at Haile Michael Admasu Building 2 floor infront of
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👉Construction engineering Questions with Answers Part 1
.
Q1. What is the Unit Weight of concrete?
A:- The unit weight of concrete depends on the type of aggregates and amount of voids. As per IS : 456-200 Unit weight of PCC is 24KN/m3 and RCC
is 25KN/m3
Q2. What is the unit weight of Steel?
A. The unit weight of Steel is 78.5KN/m3
Q3. What are the Nominal Concrete Mix proportions
for different grades:
A. Important: C-15 - 1:2:4 and C-5 - 1:4:8,C-20 and C-25 - 1:2:3,
(Cement:Sand:aggregate)
Q4. What is ductility?
A. Ductility is the Ability to deform under tensile
stress.
Q5. How to find the weight of steel bar used in
reinforcement?
A. Weight of Bar in kg/m = Dsquare/162.2 D- Dia
of bar in mm
Q6. What’s the difference between one-way slab
and two-way slab?
A. One way slab: Ratio of Longer Span / Shorter
span > 2 Two way slab: Ratio of Longer span/ shorter span <= 2
Q7. What is flat slab?
A. The slab which is supported on columns (Flab slab don’t have beams)
Q8. What do you mean by One storeyed, Two
storeyed building?
A. The building which has two floors is called two
storeyed building.
Q9. What’s the height of each floor?
A. 3m
Q10. What’s the length of rise and tread in Stair
case?
A. Rise – 150mm to 200mm, Tread – 250mm to 300mm
Q11. What’s the slope of Staircase?
A. As per IS 456, the slope or pitch of stair should
be between 25 degrees to 40 degrees.
Q12. What do you mean by the moment of inertia?
A. A quantity expressing a body’s tendency to resist
angular acceleration, which is the sum of the
products of the mass of each particle in the body
with the square of its distance from the axis of
rotation.
Q13. What is a crank length in the slab?
A. The crank length in Slab is 0.42 D. Where D is
Depth of Slab- Top cover – Bottom Cover.
Q14. What are the types of a slump?
A. True Slump: The concrete mass after the test when slumps evenly all around without disintegration is called the true slump.
*Shear Slump: When one-half of the concrete mass
slide down the other is called the shear slump. This type of slump is obtained in a lean concrete mix.
*Collapse Slump: When the sample is collapsed due to adding excessive water, it is known as collapse slump.
*Zero Slump: For very stiff or dry mixes it does not
show any changes of the slump after removing the
slump cone.
Q15. What is honeycomb in concrete? How is it
formed? How to eradicate honey comb in concrete?
A. Learn about Honeycomb concrete –
Q16. What is grouting?
A. Grout is a fluid form of concrete which is used
to fill the voids.
Q17. What is allowable moisture content in Fine
aggregate for the concrete mix?
A. We won’t use the aggregate if its moisture
content is more than 5%.
Q18. What do you mean by segregation?
A. Segregation is a separation of cement, sand from aggregate. This is caused due to Water
cement ratio and when concrete is poured about
more than 1.5m
Q19. What is Seepage?
A. Slow percolation of water through soil is called
Seepage.
Q20. What is the Compressive Strength of brick?
A. Second class brick-70kg/cm2
First class brick-105kg/cm2 Fire brick-125kg/cm2
Q21. How do you check the quality of cement on
the site?
A. 1. Date of Mfg: Cement strength decreases with
its age.
2. Color: Colour should be grey with light greenish
shade and it should be uniform. Color gives an
indication of excess lime or clay.
3. Float test: A good cement won’t float if you
throw a cement in water.
4. When you put your hand in cement bag you
should feel cool.
Q22. 1BHK full form : 1 Bedroom, 1 Hall, 1kitchen
Q23. What are the Different types of Slabs?
A. There are 16+ different types of slabs –
Q24. What is Initial & final setting time of concrete?
A. Intial Setting time : 30mins, Final setting time : 10hrs
Q25. What is durability?
A. Ability to withstand under pressure is called
Durability.
Q26. What are the concrete tests?
A. Slump test, Compressive strength test, water permeability test, Water absorption test
🚩ይቀጥላል ...
.
Q1. What is the Unit Weight of concrete?
A:- The unit weight of concrete depends on the type of aggregates and amount of voids. As per IS : 456-200 Unit weight of PCC is 24KN/m3 and RCC
is 25KN/m3
Q2. What is the unit weight of Steel?
A. The unit weight of Steel is 78.5KN/m3
Q3. What are the Nominal Concrete Mix proportions
for different grades:
A. Important: C-15 - 1:2:4 and C-5 - 1:4:8,C-20 and C-25 - 1:2:3,
(Cement:Sand:aggregate)
Q4. What is ductility?
A. Ductility is the Ability to deform under tensile
stress.
Q5. How to find the weight of steel bar used in
reinforcement?
A. Weight of Bar in kg/m = Dsquare/162.2 D- Dia
of bar in mm
Q6. What’s the difference between one-way slab
and two-way slab?
A. One way slab: Ratio of Longer Span / Shorter
span > 2 Two way slab: Ratio of Longer span/ shorter span <= 2
Q7. What is flat slab?
A. The slab which is supported on columns (Flab slab don’t have beams)
Q8. What do you mean by One storeyed, Two
storeyed building?
A. The building which has two floors is called two
storeyed building.
Q9. What’s the height of each floor?
A. 3m
Q10. What’s the length of rise and tread in Stair
case?
A. Rise – 150mm to 200mm, Tread – 250mm to 300mm
Q11. What’s the slope of Staircase?
A. As per IS 456, the slope or pitch of stair should
be between 25 degrees to 40 degrees.
Q12. What do you mean by the moment of inertia?
A. A quantity expressing a body’s tendency to resist
angular acceleration, which is the sum of the
products of the mass of each particle in the body
with the square of its distance from the axis of
rotation.
Q13. What is a crank length in the slab?
A. The crank length in Slab is 0.42 D. Where D is
Depth of Slab- Top cover – Bottom Cover.
Q14. What are the types of a slump?
A. True Slump: The concrete mass after the test when slumps evenly all around without disintegration is called the true slump.
*Shear Slump: When one-half of the concrete mass
slide down the other is called the shear slump. This type of slump is obtained in a lean concrete mix.
*Collapse Slump: When the sample is collapsed due to adding excessive water, it is known as collapse slump.
*Zero Slump: For very stiff or dry mixes it does not
show any changes of the slump after removing the
slump cone.
Q15. What is honeycomb in concrete? How is it
formed? How to eradicate honey comb in concrete?
A. Learn about Honeycomb concrete –
Q16. What is grouting?
A. Grout is a fluid form of concrete which is used
to fill the voids.
Q17. What is allowable moisture content in Fine
aggregate for the concrete mix?
A. We won’t use the aggregate if its moisture
content is more than 5%.
Q18. What do you mean by segregation?
A. Segregation is a separation of cement, sand from aggregate. This is caused due to Water
cement ratio and when concrete is poured about
more than 1.5m
Q19. What is Seepage?
A. Slow percolation of water through soil is called
Seepage.
Q20. What is the Compressive Strength of brick?
A. Second class brick-70kg/cm2
First class brick-105kg/cm2 Fire brick-125kg/cm2
Q21. How do you check the quality of cement on
the site?
A. 1. Date of Mfg: Cement strength decreases with
its age.
2. Color: Colour should be grey with light greenish
shade and it should be uniform. Color gives an
indication of excess lime or clay.
3. Float test: A good cement won’t float if you
throw a cement in water.
4. When you put your hand in cement bag you
should feel cool.
Q22. 1BHK full form : 1 Bedroom, 1 Hall, 1kitchen
Q23. What are the Different types of Slabs?
A. There are 16+ different types of slabs –
Q24. What is Initial & final setting time of concrete?
A. Intial Setting time : 30mins, Final setting time : 10hrs
Q25. What is durability?
A. Ability to withstand under pressure is called
Durability.
Q26. What are the concrete tests?
A. Slump test, Compressive strength test, water permeability test, Water absorption test
🚩ይቀጥላል ...
👉part 2 ከ ቅድም የቀጠለ
.
Q27. What is bleeding in concrete?
A. Bleeding is one form of segregation, where water
comes out to the surface of the concrete, being
lowest specific gravity among all.
Q28. What is the name of the machine to get
compression test?
A. Universal testing machine (UTM)
Q29. When we go for Pile foundation?
A. Pile foundation is adopted when the Soil bearing capacity is less than 24KN/M3
Q30. What is the function of stirrups in the column?
A. Stirrups are provided to handle the shear force
and to hold the rebars (main bars)
CLEAR COVER TO MAIN REINFORCEMENT:
1. FOOTINGS : 50 mm
2. RAFT FOUNDATION TOP : 50 mm
3. RAFT FOUNDATION BOTTOM/SIDES : 75 mm
4. STRAP BEAM : 50 mm
5. GRADE SLAB : 20 mm
6. COLUMN : 40 mm
7. SHEAR WALL : 25 mm
8. BEAMS : 25 mm
9. SLABS : 15 mm
10. FLAT SLAB : 20 mm
11. STAIRCASE : 15 mm
12. RET. WALL : 20/ 25 mm on earth
13. WATER RETAINING STRUCTURES : 20/30 mm
.
WEIGHT OF ROD PER METER LENGTH:
DIA WEIGHT PER METER
6mm = 0.222Kg
8mm = 0.395 Kg
10mm = 0.616 Kg
12mm = 0.888 Kg
16mm = 1.578 Kg
20mm = 2.466 Kg
25mm = 3.853 Kg
32mm = 6.313 Kg
40mm = 9.865 Kg
1bag cement-50kg
1feet-0.3048m
1m-3.28ft
1sq.m-10.76sq.f t
1cu.m-35.28cu.ft
STANDARD CONVERSION FACTORS
INCH = 25.4 MILLIMETRE
FOOT = 0.3048 METRE
YARD = 0.9144 METRE
MILE = 1.6093 KILOMETER
ACRE = 0.4047 HECTARE
POUND = 0.4536 KILOGRAM
DEGREE FARENHEIT X 5/9 – 32 = DEGREE
CELSIUS
MILLIMETRE= 0.0394 INCH
METRE = 3.2808FOOT
METRE = 1.0936YARD
.
UNIT WEIGHT:
01. Concrete 25 kN/m3
02. Brick 19 kN/m3
03. Steel 7850 Kg/m3
04. Water 1000 Lt/m3
05. Cement 1440 Kg/m3
06. 1Gallon 3.78 Litres
07. Link 8" = 200mm
08. 1 Hectare 2.471 acr(10000m2)
09. 1 Acr 4046.82m2 = 100 cent
.
Q27. What is bleeding in concrete?
A. Bleeding is one form of segregation, where water
comes out to the surface of the concrete, being
lowest specific gravity among all.
Q28. What is the name of the machine to get
compression test?
A. Universal testing machine (UTM)
Q29. When we go for Pile foundation?
A. Pile foundation is adopted when the Soil bearing capacity is less than 24KN/M3
Q30. What is the function of stirrups in the column?
A. Stirrups are provided to handle the shear force
and to hold the rebars (main bars)
CLEAR COVER TO MAIN REINFORCEMENT:
1. FOOTINGS : 50 mm
2. RAFT FOUNDATION TOP : 50 mm
3. RAFT FOUNDATION BOTTOM/SIDES : 75 mm
4. STRAP BEAM : 50 mm
5. GRADE SLAB : 20 mm
6. COLUMN : 40 mm
7. SHEAR WALL : 25 mm
8. BEAMS : 25 mm
9. SLABS : 15 mm
10. FLAT SLAB : 20 mm
11. STAIRCASE : 15 mm
12. RET. WALL : 20/ 25 mm on earth
13. WATER RETAINING STRUCTURES : 20/30 mm
.
WEIGHT OF ROD PER METER LENGTH:
DIA WEIGHT PER METER
6mm = 0.222Kg
8mm = 0.395 Kg
10mm = 0.616 Kg
12mm = 0.888 Kg
16mm = 1.578 Kg
20mm = 2.466 Kg
25mm = 3.853 Kg
32mm = 6.313 Kg
40mm = 9.865 Kg
1bag cement-50kg
1feet-0.3048m
1m-3.28ft
1sq.m-10.76sq.f t
1cu.m-35.28cu.ft
STANDARD CONVERSION FACTORS
INCH = 25.4 MILLIMETRE
FOOT = 0.3048 METRE
YARD = 0.9144 METRE
MILE = 1.6093 KILOMETER
ACRE = 0.4047 HECTARE
POUND = 0.4536 KILOGRAM
DEGREE FARENHEIT X 5/9 – 32 = DEGREE
CELSIUS
MILLIMETRE= 0.0394 INCH
METRE = 3.2808FOOT
METRE = 1.0936YARD
.
UNIT WEIGHT:
01. Concrete 25 kN/m3
02. Brick 19 kN/m3
03. Steel 7850 Kg/m3
04. Water 1000 Lt/m3
05. Cement 1440 Kg/m3
06. 1Gallon 3.78 Litres
07. Link 8" = 200mm
08. 1 Hectare 2.471 acr(10000m2)
09. 1 Acr 4046.82m2 = 100 cent
👉የአርማታ ብረት በሜትር ምን ያህል ይመዝናል?
.
⏩ለኮንስትራክሽን ግብዐት የምንጠቀማቸው የአርማታ ብረት በቅርፃቸው በሁለት ይከፈላሉ
1. ልሙጥ ብረት(Mild Steel or plain rebar)
2. ባለ ክርክር/አርማታ ብረት(Deformed steel rebar)
➡በጥንካሬ ደረጃ ደግሞ በስፋት Grade 60 እና Grade 40
በመባል ይለያሉ ይህም ውጥረታዊ ሀይል/tensile strength/ በመቌቌም አቅማቸው ነው።
*Grade 40=275.79MPa yield strength ሲኖረው
*Grade 60=413.68MPa yield strength ይኖረዋል።
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@engineer03 @engineer03
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#CivilEngineersWork
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⏩ለኮንስትራክሽን ግብዐት የምንጠቀማቸው የአርማታ ብረት በቅርፃቸው በሁለት ይከፈላሉ
1. ልሙጥ ብረት(Mild Steel or plain rebar)
2. ባለ ክርክር/አርማታ ብረት(Deformed steel rebar)
➡በጥንካሬ ደረጃ ደግሞ በስፋት Grade 60 እና Grade 40
በመባል ይለያሉ ይህም ውጥረታዊ ሀይል/tensile strength/ በመቌቌም አቅማቸው ነው።
*Grade 40=275.79MPa yield strength ሲኖረው
*Grade 60=413.68MPa yield strength ይኖረዋል።
Share አድርጉልን
@engineer03 @engineer03
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#CivilEngineersWork
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Civil engineer's work
Civil engineer's work, Addis Ababa, Ethiopia. 12,793 likes · 4 talking about this. �Construction document
�software class
let's Safe & Develop the construction Industry!
#share for anthers and...
�software class
let's Safe & Develop the construction Industry!
#share for anthers and...
▪️ Function of stirrups in the column -
🚧Stirrups are provided to handle the shear force and to hold the rebars in position.
#share
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🚧Stirrups are provided to handle the shear force and to hold the rebars in position.
#share
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🔹Important concept -
▪️ Column - It is the vertical member subjected to axial compression.
▪️ Classification of columns on the basis of shape -
1.Square section
2. Rectangular section
3. Circular section
4. L- section
5. T - section
Join 👉 @engineer03 to know more about Civil Engineering.
@engineer03
▪️ Column - It is the vertical member subjected to axial compression.
▪️ Classification of columns on the basis of shape -
1.Square section
2. Rectangular section
3. Circular section
4. L- section
5. T - section
Join 👉 @engineer03 to know more about Civil Engineering.
@engineer03
The soil improvement techniques are,
• Surface Compaction.
• Drainage Methods.
• Vibration Methods.
• Precompression and consolidation.
• Grouting and Injection.
• Chemical Stabilisation.
• Soil Reinforcement.
• Geo textiles and Geo membranes.
#share
Join 👉 https://t.me/engineer03 to know more about Civil Engineering.
Facebook address:-
https://Facebook.com/Civil.Eng.works
#CivilEngineersWork
• Surface Compaction.
• Drainage Methods.
• Vibration Methods.
• Precompression and consolidation.
• Grouting and Injection.
• Chemical Stabilisation.
• Soil Reinforcement.
• Geo textiles and Geo membranes.
#share
Join 👉 https://t.me/engineer03 to know more about Civil Engineering.
Facebook address:-
https://Facebook.com/Civil.Eng.works
#CivilEngineersWork
👉 PRE-STRESSED CONCRETE (PSC) VS REINFORCED CONCRETE (RC)
.
➡️ፕሪ እስትረስድ ኮንክሪት👇
▶️ኮንክሪቱ ላይ ሎድ ከመጫኑ በፊት Axial Compressive Stress አፕላይ ይደረግባቸል።
⏺ለምሳሌ አንድን ቢም ከጎንና ከጎን Compressive ፎርስ ስናደርግበት የ ‹‹ በ ›› ፊደል አይነት ቅርፅ ይኖረዋል (ሲጋነን) ኢሄ የታጠፈው ቢም እላዩ ላይ ሎድ ሲጫንበት ቢሙ ወደ ነበረበት ቦታው ይመለሳል።
🚩እንደዛ ነው pre-stressed ኮንክሪቶች act የሚያደርጉት
🚧PSC Vs RC
➡️1 RC beam ላይ ለዲዛይን assume ስናደርግ ኮንክሪቱ ምንም አይነት tensile stress አይሸከምም - tensile እስትረሱን የሚሸከመው ፌሮው ነው ብለን ነው ሌላው assumption ፌሮው ቴንሽኑን ይሸከማል ብንልም የፌሮውን አቅም fully utilize አናደርገውም ወይም ደሞ ሙሉ ለሙሉ አንጠቀምበትም የዚህም ምክንያቱ ኮንክሪቱ ቴንሽን ዞን ውስጥ የሚከሰተውን Crack width ለመገደብ ወይም limit ለማድረግ ነው።
⏹ከላይ በተገለፁት ሁለት ምክንያቶች ማለትም የኮንክሪቱንም የፌሮውንም አቅም ሙሉ ለሙሉ ባለመጠቀማችን የተነሳ ለትልልቅ ሎዶች RC ከ PSC አንፃር ኢኮኖሚካል አይደለም።
⏹የዚህም ምክንያቱ የ RCን አቅም ሙሉ ለሙሉ ስለማንጠቀምበት ነው በተጨማሪም RC ላይ ትልልቅ Grade ያላቸው ኮንክሪትና ፌሮ መጠቀማችን ብዙም ዋጋ የለውም ከ RC ድክመት ለመዳን Pre-Stressed ኮንክሪቶች ተፈጠሩ ከRC በተሻለ መልኩ የኮንክሪቱንና የብረቱን እስትሬንግዝ ይጠቀማሉና።
🚧Methods of Prestressing
➡️1) Pre tensioning👇
⏺ቢሙን ካስት ማድረጊያ mold እናዘጋጃለን።
⏺ሞልድ ውስጥም PSC ኬብሎች ወይም tendon
እናስቀምጣለን
⏺እነዚህ ኬብሎችም ላይ Tensile ፎርስ apply እናደርጋለን
⏺አፕላይ እንደተደረገ ኮንክሪቱን ሞልድ ውስጥ አስገብተን ኮንክሪቱን ካስት እናደርጋለን
⏺ኮንክሪቱ ሲደርቅ ፎርሶቹን remove እናደርጋለን ቢሙም ዝግጁ ሆነ ማለት ነው::
➡️2) Post tensioning👇
⏺እዚህ ላይ ኮንክሪቱ ከደረቀ በኋላ ነው Compressive force አፕላይ የምናደርገው
⏺Apply የሚደረጉት ፎርሶች ኮንክሪቱ ላይ compressive stress ሲፈጥሩ ብረቱ ላይ ደሞ tensile stress ይፈጥራሉ ማለት ነው::
#Structure
#Concretetechnology
👉 PRE-STRESSED CONCRETE (PSC) VS REINFORCED CONCRETE (RC)
.
➡️ፕሪ እስትረስድ ኮንክሪት👇
▶️ኮንክሪቱ ላይ ሎድ ከመጫኑ በፊት Axial Compressive Stress አፕላይ ይደረግባቸል።
⏺ለምሳሌ አንድን ቢም ከጎንና ከጎን Compressive ፎርስ ስናደርግበት የ ‹‹ በ ›› ፊደል አይነት ቅርፅ ይኖረዋል (ሲጋነን) ኢሄ የታጠፈው ቢም እላዩ ላይ ሎድ ሲጫንበት ቢሙ ወደ ነበረበት ቦታው ይመለሳል።
🚩እንደዛ ነው pre-stressed ኮንክሪቶች act የሚያደርጉት
🚧PSC Vs RC
➡️1 RC beam ላይ ለዲዛይን assume ስናደርግ ኮንክሪቱ ምንም አይነት tensile stress አይሸከምም - tensile እስትረሱን የሚሸከመው ፌሮው ነው ብለን ነው ሌላው assumption ፌሮው ቴንሽኑን ይሸከማል ብንልም የፌሮውን አቅም fully utilize አናደርገውም ወይም ደሞ ሙሉ ለሙሉ አንጠቀምበትም የዚህም ምክንያቱ ኮንክሪቱ ቴንሽን ዞን ውስጥ የሚከሰተውን Crack width ለመገደብ ወይም limit ለማድረግ ነው።
⏹ከላይ በተገለፁት ሁለት ምክንያቶች ማለትም የኮንክሪቱንም የፌሮውንም አቅም ሙሉ ለሙሉ ባለመጠቀማችን የተነሳ ለትልልቅ ሎዶች RC ከ PSC አንፃር ኢኮኖሚካል አይደለም።
⏹የዚህም ምክንያቱ የ RCን አቅም ሙሉ ለሙሉ ስለማንጠቀምበት ነው በተጨማሪም RC ላይ ትልልቅ Grade ያላቸው ኮንክሪትና ፌሮ መጠቀማችን ብዙም ዋጋ የለውም ከ RC ድክመት ለመዳን Pre-Stressed ኮንክሪቶች ተፈጠሩ ከRC በተሻለ መልኩ የኮንክሪቱንና የብረቱን እስትሬንግዝ ይጠቀማሉና።
🚧Methods of Prestressing
➡️1) Pre tensioning👇
⏺ቢሙን ካስት ማድረጊያ mold እናዘጋጃለን።
⏺ሞልድ ውስጥም PSC ኬብሎች ወይም tendon
እናስቀምጣለን
⏺እነዚህ ኬብሎችም ላይ Tensile ፎርስ apply እናደርጋለን
⏺አፕላይ እንደተደረገ ኮንክሪቱን ሞልድ ውስጥ አስገብተን ኮንክሪቱን ካስት እናደርጋለን
⏺ኮንክሪቱ ሲደርቅ ፎርሶቹን remove እናደርጋለን ቢሙም ዝግጁ ሆነ ማለት ነው::
➡️2) Post tensioning👇
⏺እዚህ ላይ ኮንክሪቱ ከደረቀ በኋላ ነው Compressive force አፕላይ የምናደርገው
⏺Apply የሚደረጉት ፎርሶች ኮንክሪቱ ላይ compressive stress ሲፈጥሩ ብረቱ ላይ ደሞ tensile stress ይፈጥራሉ ማለት ነው::
#Structure
#Concretetechnology
@Engineer03
.
➡️ፕሪ እስትረስድ ኮንክሪት👇
▶️ኮንክሪቱ ላይ ሎድ ከመጫኑ በፊት Axial Compressive Stress አፕላይ ይደረግባቸል።
⏺ለምሳሌ አንድን ቢም ከጎንና ከጎን Compressive ፎርስ ስናደርግበት የ ‹‹ በ ›› ፊደል አይነት ቅርፅ ይኖረዋል (ሲጋነን) ኢሄ የታጠፈው ቢም እላዩ ላይ ሎድ ሲጫንበት ቢሙ ወደ ነበረበት ቦታው ይመለሳል።
🚩እንደዛ ነው pre-stressed ኮንክሪቶች act የሚያደርጉት
🚧PSC Vs RC
➡️1 RC beam ላይ ለዲዛይን assume ስናደርግ ኮንክሪቱ ምንም አይነት tensile stress አይሸከምም - tensile እስትረሱን የሚሸከመው ፌሮው ነው ብለን ነው ሌላው assumption ፌሮው ቴንሽኑን ይሸከማል ብንልም የፌሮውን አቅም fully utilize አናደርገውም ወይም ደሞ ሙሉ ለሙሉ አንጠቀምበትም የዚህም ምክንያቱ ኮንክሪቱ ቴንሽን ዞን ውስጥ የሚከሰተውን Crack width ለመገደብ ወይም limit ለማድረግ ነው።
⏹ከላይ በተገለፁት ሁለት ምክንያቶች ማለትም የኮንክሪቱንም የፌሮውንም አቅም ሙሉ ለሙሉ ባለመጠቀማችን የተነሳ ለትልልቅ ሎዶች RC ከ PSC አንፃር ኢኮኖሚካል አይደለም።
⏹የዚህም ምክንያቱ የ RCን አቅም ሙሉ ለሙሉ ስለማንጠቀምበት ነው በተጨማሪም RC ላይ ትልልቅ Grade ያላቸው ኮንክሪትና ፌሮ መጠቀማችን ብዙም ዋጋ የለውም ከ RC ድክመት ለመዳን Pre-Stressed ኮንክሪቶች ተፈጠሩ ከRC በተሻለ መልኩ የኮንክሪቱንና የብረቱን እስትሬንግዝ ይጠቀማሉና።
🚧Methods of Prestressing
➡️1) Pre tensioning👇
⏺ቢሙን ካስት ማድረጊያ mold እናዘጋጃለን።
⏺ሞልድ ውስጥም PSC ኬብሎች ወይም tendon
እናስቀምጣለን
⏺እነዚህ ኬብሎችም ላይ Tensile ፎርስ apply እናደርጋለን
⏺አፕላይ እንደተደረገ ኮንክሪቱን ሞልድ ውስጥ አስገብተን ኮንክሪቱን ካስት እናደርጋለን
⏺ኮንክሪቱ ሲደርቅ ፎርሶቹን remove እናደርጋለን ቢሙም ዝግጁ ሆነ ማለት ነው::
➡️2) Post tensioning👇
⏺እዚህ ላይ ኮንክሪቱ ከደረቀ በኋላ ነው Compressive force አፕላይ የምናደርገው
⏺Apply የሚደረጉት ፎርሶች ኮንክሪቱ ላይ compressive stress ሲፈጥሩ ብረቱ ላይ ደሞ tensile stress ይፈጥራሉ ማለት ነው::
#Structure
#Concretetechnology
👉 PRE-STRESSED CONCRETE (PSC) VS REINFORCED CONCRETE (RC)
.
➡️ፕሪ እስትረስድ ኮንክሪት👇
▶️ኮንክሪቱ ላይ ሎድ ከመጫኑ በፊት Axial Compressive Stress አፕላይ ይደረግባቸል።
⏺ለምሳሌ አንድን ቢም ከጎንና ከጎን Compressive ፎርስ ስናደርግበት የ ‹‹ በ ›› ፊደል አይነት ቅርፅ ይኖረዋል (ሲጋነን) ኢሄ የታጠፈው ቢም እላዩ ላይ ሎድ ሲጫንበት ቢሙ ወደ ነበረበት ቦታው ይመለሳል።
🚩እንደዛ ነው pre-stressed ኮንክሪቶች act የሚያደርጉት
🚧PSC Vs RC
➡️1 RC beam ላይ ለዲዛይን assume ስናደርግ ኮንክሪቱ ምንም አይነት tensile stress አይሸከምም - tensile እስትረሱን የሚሸከመው ፌሮው ነው ብለን ነው ሌላው assumption ፌሮው ቴንሽኑን ይሸከማል ብንልም የፌሮውን አቅም fully utilize አናደርገውም ወይም ደሞ ሙሉ ለሙሉ አንጠቀምበትም የዚህም ምክንያቱ ኮንክሪቱ ቴንሽን ዞን ውስጥ የሚከሰተውን Crack width ለመገደብ ወይም limit ለማድረግ ነው።
⏹ከላይ በተገለፁት ሁለት ምክንያቶች ማለትም የኮንክሪቱንም የፌሮውንም አቅም ሙሉ ለሙሉ ባለመጠቀማችን የተነሳ ለትልልቅ ሎዶች RC ከ PSC አንፃር ኢኮኖሚካል አይደለም።
⏹የዚህም ምክንያቱ የ RCን አቅም ሙሉ ለሙሉ ስለማንጠቀምበት ነው በተጨማሪም RC ላይ ትልልቅ Grade ያላቸው ኮንክሪትና ፌሮ መጠቀማችን ብዙም ዋጋ የለውም ከ RC ድክመት ለመዳን Pre-Stressed ኮንክሪቶች ተፈጠሩ ከRC በተሻለ መልኩ የኮንክሪቱንና የብረቱን እስትሬንግዝ ይጠቀማሉና።
🚧Methods of Prestressing
➡️1) Pre tensioning👇
⏺ቢሙን ካስት ማድረጊያ mold እናዘጋጃለን።
⏺ሞልድ ውስጥም PSC ኬብሎች ወይም tendon
እናስቀምጣለን
⏺እነዚህ ኬብሎችም ላይ Tensile ፎርስ apply እናደርጋለን
⏺አፕላይ እንደተደረገ ኮንክሪቱን ሞልድ ውስጥ አስገብተን ኮንክሪቱን ካስት እናደርጋለን
⏺ኮንክሪቱ ሲደርቅ ፎርሶቹን remove እናደርጋለን ቢሙም ዝግጁ ሆነ ማለት ነው::
➡️2) Post tensioning👇
⏺እዚህ ላይ ኮንክሪቱ ከደረቀ በኋላ ነው Compressive force አፕላይ የምናደርገው
⏺Apply የሚደረጉት ፎርሶች ኮንክሪቱ ላይ compressive stress ሲፈጥሩ ብረቱ ላይ ደሞ tensile stress ይፈጥራሉ ማለት ነው::
#Structure
#Concretetechnology
@Engineer03
👉 PRE-STRESSED CONCRETE (PSC) VS REINFORCED CONCRETE (RC)
.
➡️ፕሪ እስትረስድ ኮንክሪት👇
▶️ኮንክሪቱ ላይ ሎድ ከመጫኑ በፊት Axial Compressive Stress አፕላይ ይደረግባቸል።
⏺ለምሳሌ አንድን ቢም ከጎንና ከጎን Compressive ፎርስ ስናደርግበት የ ‹‹ በ ›› ፊደል አይነት ቅርፅ ይኖረዋል (ሲጋነን) ኢሄ የታጠፈው ቢም እላዩ ላይ ሎድ ሲጫንበት ቢሙ ወደ ነበረበት ቦታው ይመለሳል።
🚩እንደዛ ነው pre-stressed ኮንክሪቶች act የሚያደርጉት
🚧PSC Vs RC
➡️1 RC beam ላይ ለዲዛይን assume ስናደርግ ኮንክሪቱ ምንም አይነት tensile stress አይሸከምም - tensile እስትረሱን የሚሸከመው ፌሮው ነው ብለን ነው ሌላው assumption ፌሮው ቴንሽኑን ይሸከማል ብንልም የፌሮውን አቅም fully utilize አናደርገውም ወይም ደሞ ሙሉ ለሙሉ አንጠቀምበትም የዚህም ምክንያቱ ኮንክሪቱ ቴንሽን ዞን ውስጥ የሚከሰተውን Crack width ለመገደብ ወይም limit ለማድረግ ነው።
⏹ከላይ በተገለፁት ሁለት ምክንያቶች ማለትም የኮንክሪቱንም የፌሮውንም አቅም ሙሉ ለሙሉ ባለመጠቀማችን የተነሳ ለትልልቅ ሎዶች RC ከ PSC አንፃር ኢኮኖሚካል አይደለም።
⏹የዚህም ምክንያቱ የ RCን አቅም ሙሉ ለሙሉ ስለማንጠቀምበት ነው በተጨማሪም RC ላይ ትልልቅ Grade ያላቸው ኮንክሪትና ፌሮ መጠቀማችን ብዙም ዋጋ የለውም ከ RC ድክመት ለመዳን Pre-Stressed ኮንክሪቶች ተፈጠሩ ከRC በተሻለ መልኩ የኮንክሪቱንና የብረቱን እስትሬንግዝ ይጠቀማሉና።
🚧Methods of Prestressing
➡️1) Pre tensioning👇
⏺ቢሙን ካስት ማድረጊያ mold እናዘጋጃለን።
⏺ሞልድ ውስጥም PSC ኬብሎች ወይም tendon
እናስቀምጣለን
⏺እነዚህ ኬብሎችም ላይ Tensile ፎርስ apply እናደርጋለን
⏺አፕላይ እንደተደረገ ኮንክሪቱን ሞልድ ውስጥ አስገብተን ኮንክሪቱን ካስት እናደርጋለን
⏺ኮንክሪቱ ሲደርቅ ፎርሶቹን remove እናደርጋለን ቢሙም ዝግጁ ሆነ ማለት ነው::
➡️2) Post tensioning👇
⏺እዚህ ላይ ኮንክሪቱ ከደረቀ በኋላ ነው Compressive force አፕላይ የምናደርገው
⏺Apply የሚደረጉት ፎርሶች ኮንክሪቱ ላይ compressive stress ሲፈጥሩ ብረቱ ላይ ደሞ tensile stress ይፈጥራሉ ማለት ነው::
#Structure
#Concretetechnology
@Engineer03
.
➡️ፕሪ እስትረስድ ኮንክሪት👇
▶️ኮንክሪቱ ላይ ሎድ ከመጫኑ በፊት Axial Compressive Stress አፕላይ ይደረግባቸል።
⏺ለምሳሌ አንድን ቢም ከጎንና ከጎን Compressive ፎርስ ስናደርግበት የ ‹‹ በ ›› ፊደል አይነት ቅርፅ ይኖረዋል (ሲጋነን) ኢሄ የታጠፈው ቢም እላዩ ላይ ሎድ ሲጫንበት ቢሙ ወደ ነበረበት ቦታው ይመለሳል።
🚩እንደዛ ነው pre-stressed ኮንክሪቶች act የሚያደርጉት
🚧PSC Vs RC
➡️1 RC beam ላይ ለዲዛይን assume ስናደርግ ኮንክሪቱ ምንም አይነት tensile stress አይሸከምም - tensile እስትረሱን የሚሸከመው ፌሮው ነው ብለን ነው ሌላው assumption ፌሮው ቴንሽኑን ይሸከማል ብንልም የፌሮውን አቅም fully utilize አናደርገውም ወይም ደሞ ሙሉ ለሙሉ አንጠቀምበትም የዚህም ምክንያቱ ኮንክሪቱ ቴንሽን ዞን ውስጥ የሚከሰተውን Crack width ለመገደብ ወይም limit ለማድረግ ነው።
⏹ከላይ በተገለፁት ሁለት ምክንያቶች ማለትም የኮንክሪቱንም የፌሮውንም አቅም ሙሉ ለሙሉ ባለመጠቀማችን የተነሳ ለትልልቅ ሎዶች RC ከ PSC አንፃር ኢኮኖሚካል አይደለም።
⏹የዚህም ምክንያቱ የ RCን አቅም ሙሉ ለሙሉ ስለማንጠቀምበት ነው በተጨማሪም RC ላይ ትልልቅ Grade ያላቸው ኮንክሪትና ፌሮ መጠቀማችን ብዙም ዋጋ የለውም ከ RC ድክመት ለመዳን Pre-Stressed ኮንክሪቶች ተፈጠሩ ከRC በተሻለ መልኩ የኮንክሪቱንና የብረቱን እስትሬንግዝ ይጠቀማሉና።
🚧Methods of Prestressing
➡️1) Pre tensioning👇
⏺ቢሙን ካስት ማድረጊያ mold እናዘጋጃለን።
⏺ሞልድ ውስጥም PSC ኬብሎች ወይም tendon
እናስቀምጣለን
⏺እነዚህ ኬብሎችም ላይ Tensile ፎርስ apply እናደርጋለን
⏺አፕላይ እንደተደረገ ኮንክሪቱን ሞልድ ውስጥ አስገብተን ኮንክሪቱን ካስት እናደርጋለን
⏺ኮንክሪቱ ሲደርቅ ፎርሶቹን remove እናደርጋለን ቢሙም ዝግጁ ሆነ ማለት ነው::
➡️2) Post tensioning👇
⏺እዚህ ላይ ኮንክሪቱ ከደረቀ በኋላ ነው Compressive force አፕላይ የምናደርገው
⏺Apply የሚደረጉት ፎርሶች ኮንክሪቱ ላይ compressive stress ሲፈጥሩ ብረቱ ላይ ደሞ tensile stress ይፈጥራሉ ማለት ነው::
#Structure
#Concretetechnology
@Engineer03
*▪Some Important Questions*
*1: what is Development Length?*
*Ans:* Development length is an extera length of steel, which transter the load from one steel bar to other.
*2: What is Hydration?*
*Ans:* Hydration is reaction b/w cement and water.
*3: What is M20 Grad Concrete?*
*Ans:* “M” Stands for Mix and No (20) is the Compressive strength of concrete in 20N/mm2 after 28 days after laboratory test. and M20 grad concrete we have to use in the RCC slab.
*4: What is Water Cement ratio?*
*Ans:* water–cement ratio is the ratio of the weight of water to the weight of cement used in a concrete mix.
*5: What is Bearing Capacity of Soil?*
*Ans:* Bearing Capacity is the capacity of soil to support the load applied to the ground.
*6: Time to removal of Fromwork for different RCC structures?*
*Ans:* For column/walls, vertical form works should be detached after 16 to 24 hours.
Soffit formwork to slab (formwork is located under the slab), the form works can be removed after 3 days. (props should be reaffixed once the removal is done).
Soffit formwork to beam, the form works can be removed after 7 days. (props should be reaffixed once the removal is done.)
Beam that spans up to 4.5 m (length), the form works can be removed after 7 days.
Beam that spans surpassing 4.5 m (length), the form works can be removed after 14 days.
For footing, the formworks can be removed after 16 to 24 hours.
For staircase, the form works can be removed after 5 days.
@Engineer03
*1: what is Development Length?*
*Ans:* Development length is an extera length of steel, which transter the load from one steel bar to other.
*2: What is Hydration?*
*Ans:* Hydration is reaction b/w cement and water.
*3: What is M20 Grad Concrete?*
*Ans:* “M” Stands for Mix and No (20) is the Compressive strength of concrete in 20N/mm2 after 28 days after laboratory test. and M20 grad concrete we have to use in the RCC slab.
*4: What is Water Cement ratio?*
*Ans:* water–cement ratio is the ratio of the weight of water to the weight of cement used in a concrete mix.
*5: What is Bearing Capacity of Soil?*
*Ans:* Bearing Capacity is the capacity of soil to support the load applied to the ground.
*6: Time to removal of Fromwork for different RCC structures?*
*Ans:* For column/walls, vertical form works should be detached after 16 to 24 hours.
Soffit formwork to slab (formwork is located under the slab), the form works can be removed after 3 days. (props should be reaffixed once the removal is done).
Soffit formwork to beam, the form works can be removed after 7 days. (props should be reaffixed once the removal is done.)
Beam that spans up to 4.5 m (length), the form works can be removed after 7 days.
Beam that spans surpassing 4.5 m (length), the form works can be removed after 14 days.
For footing, the formworks can be removed after 16 to 24 hours.
For staircase, the form works can be removed after 5 days.
@Engineer03
Forwarded from አሥራት ሚዲያ Asrat Media ®🇪🇹
ኢትዮጵያዬ እንኳን ደስ አለሽ! ቀነኒሳ አንበሳው ልጅሽ በጉዳት ባይወዳደርም አዲስ የወለድሻቸው ጀግኖችሽ አኩርተውሻል!
ሹራ ቂታታ የ #ለንደንማራቶን 1ኛ አሸናፊ! እንዲሁም ከ3ኛ እስከ 6ኛ በሙሉ ኢትዮጵያውያን!
ሁሌም የሚወድሽ ከፍ የሚያረግሽ የሚያስከብርሽ ያሳጣሽ! መቼም የጀግና መሃን አትሁኚ! በሌላውም እንዲሁ አብሪ! መልካም ልጆች ያብዛልሽ! ጀግና አትንጠፊ!
Congratulations Ethiopiayeee! Even though your lion king son Keneisa was let down with injury, your new born heroes made you so proud!
Shura Kitata won the #londonmarathon2020! Also 3rd to 6th place, all Ethiopians!
May you always sons and daughters that honors you and lifts you up! May you always be a mother of heroes! Be abundant with blesses children! May you never ran out of heroes!
#Ethiopia #Marathon #london
🇪🇹 🇪🇹🇪🇹🇪🇹🇪🇹🇪🇹
💚💛❤️
መስከረም 24 ቀን 2013 ዓ.ም
@Asrat_News
@Asrat_News
ሹራ ቂታታ የ #ለንደንማራቶን 1ኛ አሸናፊ! እንዲሁም ከ3ኛ እስከ 6ኛ በሙሉ ኢትዮጵያውያን!
ሁሌም የሚወድሽ ከፍ የሚያረግሽ የሚያስከብርሽ ያሳጣሽ! መቼም የጀግና መሃን አትሁኚ! በሌላውም እንዲሁ አብሪ! መልካም ልጆች ያብዛልሽ! ጀግና አትንጠፊ!
Congratulations Ethiopiayeee! Even though your lion king son Keneisa was let down with injury, your new born heroes made you so proud!
Shura Kitata won the #londonmarathon2020! Also 3rd to 6th place, all Ethiopians!
May you always sons and daughters that honors you and lifts you up! May you always be a mother of heroes! Be abundant with blesses children! May you never ran out of heroes!
#Ethiopia #Marathon #london
🇪🇹 🇪🇹🇪🇹🇪🇹🇪🇹🇪🇹
💚💛❤️
መስከረም 24 ቀን 2013 ዓ.ም
@Asrat_News
@Asrat_News
National premix construction P.L.C
QUALITY SUPERVISOR
Address: አ/አ ጎተራ ወንጌላዊት ህንጻ ፊት ለፊት የመጽሀፍ ቅዱስ ኮሌጅ
ሶስተኛ ፎቅ ቢሮ ቁጥር 306 አስተዳደር ቢሮ እና ቃሊቲ የፋብሪካ አድራሻ ቁስቋም
ቤተክርስቲያን ሳይደርሱ የአሽከርካሪዎች ማሰልጠኛው ሲደርሱ በስተግራ 200
ሜትር ገባ ብሎ ናሽናል ፕሪሚክስ ኮንስትራክሽን ኃ/የተ/የግል ማህበር
Full Time October 5, 2020 - October 11, 2020
JOB REQUIREMENT
BSc Degree Civil Engineering. with 2 years’ work experience
Special Training Computer training in MS word processing, excel,access and power point software Proficiency with desktop publishing and graphic package
HOW TO APPLY
Registration Date: from 20/01/2013 up to 30/01/2013 EC
Registration Time: Monday-Friday 8:00AM–5:00PM
አድራሻ አ/አ ጎተራ ወንጌላዊት ህንጻ ፊት ለፊት የመጽሀፍ ቅዱስ ኮሌጅ ሶስተኛ ፎቅ
ቢሮ ቁጥር 306 አስተዳደር ቢሮ እና ቃሊቲ የፋብሪካ አድራሻ ቁስቋም ቤተክርስቲያን ሳይደርሱ የአሽከርካሪዎች ማሰልጠኛው ሲደርሱ በስተግራ 200 ሜትር ገባ ብሎ ናሽናል ፕሪሚክስ ኮንስትራክሽን ኃ/የተ/የግል ማህበር
ስልክ ቁጥር 0118225392 /0911616124/0984715370
QUALITY SUPERVISOR
Address: አ/አ ጎተራ ወንጌላዊት ህንጻ ፊት ለፊት የመጽሀፍ ቅዱስ ኮሌጅ
ሶስተኛ ፎቅ ቢሮ ቁጥር 306 አስተዳደር ቢሮ እና ቃሊቲ የፋብሪካ አድራሻ ቁስቋም
ቤተክርስቲያን ሳይደርሱ የአሽከርካሪዎች ማሰልጠኛው ሲደርሱ በስተግራ 200
ሜትር ገባ ብሎ ናሽናል ፕሪሚክስ ኮንስትራክሽን ኃ/የተ/የግል ማህበር
Full Time October 5, 2020 - October 11, 2020
JOB REQUIREMENT
BSc Degree Civil Engineering. with 2 years’ work experience
Special Training Computer training in MS word processing, excel,access and power point software Proficiency with desktop publishing and graphic package
HOW TO APPLY
Registration Date: from 20/01/2013 up to 30/01/2013 EC
Registration Time: Monday-Friday 8:00AM–5:00PM
አድራሻ አ/አ ጎተራ ወንጌላዊት ህንጻ ፊት ለፊት የመጽሀፍ ቅዱስ ኮሌጅ ሶስተኛ ፎቅ
ቢሮ ቁጥር 306 አስተዳደር ቢሮ እና ቃሊቲ የፋብሪካ አድራሻ ቁስቋም ቤተክርስቲያን ሳይደርሱ የአሽከርካሪዎች ማሰልጠኛው ሲደርሱ በስተግራ 200 ሜትር ገባ ብሎ ናሽናል ፕሪሚክስ ኮንስትራክሽን ኃ/የተ/የግል ማህበር
ስልክ ቁጥር 0118225392 /0911616124/0984715370
Ovid construction P.L.C
SITE ENGINEER
Address: Wello sefer,Ethio-china Friend ship Avenue beyond mina building near Taff oil Head office
Full Time October 5, 2020 - October 13, 2020
JOB REQUIREMENT
Minimum Qualification : B.S.C degree in Civil Engineering or related field
General (years) Experience: 6 years
Specific (years) Experience: 3 years
Remark: Similar experience in construction projects is mandatory
No. Req.3
Place of work: Project- Hosanna and Modjo
HOW TO APPLY
Applicants who fulfill the above minimum requirement are invited to non-returnable CV with a letter of application and copies of relevant credentials to the address below within 6(six) consecutive working days from the announcement of this vacancy in person at Head office, H,R Department.
Adress: Wello sefer,Ethio-china Friend ship Avenue beyond mina building near Taff oil Head office.
Tel 0911-69-75-03 or 0911-14-67-31 ,0116613399(Office).
SITE ENGINEER
Address: Wello sefer,Ethio-china Friend ship Avenue beyond mina building near Taff oil Head office
Full Time October 5, 2020 - October 13, 2020
JOB REQUIREMENT
Minimum Qualification : B.S.C degree in Civil Engineering or related field
General (years) Experience: 6 years
Specific (years) Experience: 3 years
Remark: Similar experience in construction projects is mandatory
No. Req.3
Place of work: Project- Hosanna and Modjo
HOW TO APPLY
Applicants who fulfill the above minimum requirement are invited to non-returnable CV with a letter of application and copies of relevant credentials to the address below within 6(six) consecutive working days from the announcement of this vacancy in person at Head office, H,R Department.
Adress: Wello sefer,Ethio-china Friend ship Avenue beyond mina building near Taff oil Head office.
Tel 0911-69-75-03 or 0911-14-67-31 ,0116613399(Office).