👉Concrete Curing (Methods, Importance & Site Practice – Practical & Technical) questions
1. What is concrete curing?
Concrete curing is the process of maintaining adequate moisture, temperature, and time to allow proper hydration of cement and strength development.
2. Why is curing important in concrete works?
Curing improves strength, durability, impermeability, and reduces cracking and surface defects.
3. When should concrete curing start?
Curing should start immediately after the concrete has set sufficiently to prevent surface damage.
4. What happens if concrete is not properly cured?
Poor curing leads to low strength, surface cracking, dusting, shrinkage, and reduced durability.
5. What are the main objectives of concrete curing?
To prevent moisture loss, control temperature, and ensure complete cement hydration.
6. What are the common methods of concrete curing?
Water curing, membrane curing, steam curing, and curing compounds.
7. What is water curing?
A curing method where water is applied continuously to keep the concrete surface moist.
8. What are examples of water curing methods?
Ponding, sprinkling, wet hessian covering, and continuous water spray.
9. Where is ponding commonly used?
On flat surfaces such as slabs, pavements, and bridge decks.
10. What is membrane curing?
A method that involves covering the concrete surface with impermeable materials to prevent moisture loss.
11. What materials are used for membrane curing?
Polythene sheets, bituminous membranes, and curing compounds.
12. What is curing compound?
A liquid chemical applied to the concrete surface to form a moisture-retaining film.
13. Where are curing compounds commonly used?
Road works, large concrete surfaces, and areas where water curing is difficult.
14. What is steam curing?
A curing method using steam to accelerate strength gain, mainly for precast concrete elements.
15. Where is steam curing applied?
Precast yards, concrete blocks, pipes, and factory-produced elements.
16. How long should concrete curing last?
Generally 7 days for ordinary Portland cement and at least 14 days for blended cements, depending on specifications.
17. How does temperature affect curing?
High temperatures increase evaporation and risk of cracking, while low temperatures slow down strength development.
18. What precautions should be taken during hot weather curing?
Increase curing frequency, protect surfaces from direct sunlight, and use windbreaks where necessary.
19. Who is responsible for ensuring proper concrete curing on site?
The site engineer, quality control engineer, and site supervisors.
20. How does proper curing affect concrete durability?
It improves resistance to abrasion, weathering, chemical attack, and extends the service life of the structure.
@etconp
1. What is concrete curing?
Concrete curing is the process of maintaining adequate moisture, temperature, and time to allow proper hydration of cement and strength development.
2. Why is curing important in concrete works?
Curing improves strength, durability, impermeability, and reduces cracking and surface defects.
3. When should concrete curing start?
Curing should start immediately after the concrete has set sufficiently to prevent surface damage.
4. What happens if concrete is not properly cured?
Poor curing leads to low strength, surface cracking, dusting, shrinkage, and reduced durability.
5. What are the main objectives of concrete curing?
To prevent moisture loss, control temperature, and ensure complete cement hydration.
6. What are the common methods of concrete curing?
Water curing, membrane curing, steam curing, and curing compounds.
7. What is water curing?
A curing method where water is applied continuously to keep the concrete surface moist.
8. What are examples of water curing methods?
Ponding, sprinkling, wet hessian covering, and continuous water spray.
9. Where is ponding commonly used?
On flat surfaces such as slabs, pavements, and bridge decks.
10. What is membrane curing?
A method that involves covering the concrete surface with impermeable materials to prevent moisture loss.
11. What materials are used for membrane curing?
Polythene sheets, bituminous membranes, and curing compounds.
12. What is curing compound?
A liquid chemical applied to the concrete surface to form a moisture-retaining film.
13. Where are curing compounds commonly used?
Road works, large concrete surfaces, and areas where water curing is difficult.
14. What is steam curing?
A curing method using steam to accelerate strength gain, mainly for precast concrete elements.
15. Where is steam curing applied?
Precast yards, concrete blocks, pipes, and factory-produced elements.
16. How long should concrete curing last?
Generally 7 days for ordinary Portland cement and at least 14 days for blended cements, depending on specifications.
17. How does temperature affect curing?
High temperatures increase evaporation and risk of cracking, while low temperatures slow down strength development.
18. What precautions should be taken during hot weather curing?
Increase curing frequency, protect surfaces from direct sunlight, and use windbreaks where necessary.
19. Who is responsible for ensuring proper concrete curing on site?
The site engineer, quality control engineer, and site supervisors.
20. How does proper curing affect concrete durability?
It improves resistance to abrasion, weathering, chemical attack, and extends the service life of the structure.
@etconp
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👉በዛሬው እለት የሸበሌ ሪዞርት በይፋ ተመርቋል
💫ሪዞርቱ የገበታ ለትውልድ ዋነኛ ፕሮጀክት ሲሆን በ385 ሄክታር መሬት ላይ ያረፈ ነው፤ በአንድ ጊዜ እስከ 400 እንግዶችን ማስተናገድ የሚችሉ ሦስት ምግብ ቤቶች፣ ልዩ የባሕል ማዕከል፣ ዘመናዊ የክብረ-በዓላትና የስብሰባ አዳራሾች አሉት፤
🚧እንዲሁም፦ የሕፃናት መጫወቻ ስፍራዎችና 15.4 ኪሎ ሜትር የሚረዝሙ የእግረኛ መንገዶችን የያዘው የሸበሌ ሪዞርት፤ ማኅበራዊ ትስስርን ለማጠናከር ታሳቢ ተደርጎ የተገነባ ነው፤
💫10,000 የፍራፍሬ ተክሎች ካረፉበት የፍራፍሬ ፓርክ ጀምሮ እስከ ዋናው የግመል ፓርክ ድረስ፤ እያንዳንዱ የሪዞርቱ ገጽታ የኢትዮጵያን ተፈጥሯዊና ባህላዊ ሐብት የሚያንፀባርቅ ነው፣
⏺በ51 የተጠናቀቁ የመኝታ ክፍሎችና በዓለም አቀፍ ደረጃ በሚገኙ የቱሪዝም አገልግሎቶች እውን የሆነው ሸበሌ ሪዞርት፤ ኢትዮጵያን በአፍሪካ ቀዳሚ የቱሪስት መዳረሻ ለማድረግ በሚደረገው ጉዞ ውስጥ ትልቅ ታሪካዊ እጥፋት ነው፤
@etconp
💫ሪዞርቱ የገበታ ለትውልድ ዋነኛ ፕሮጀክት ሲሆን በ385 ሄክታር መሬት ላይ ያረፈ ነው፤ በአንድ ጊዜ እስከ 400 እንግዶችን ማስተናገድ የሚችሉ ሦስት ምግብ ቤቶች፣ ልዩ የባሕል ማዕከል፣ ዘመናዊ የክብረ-በዓላትና የስብሰባ አዳራሾች አሉት፤
🚧እንዲሁም፦ የሕፃናት መጫወቻ ስፍራዎችና 15.4 ኪሎ ሜትር የሚረዝሙ የእግረኛ መንገዶችን የያዘው የሸበሌ ሪዞርት፤ ማኅበራዊ ትስስርን ለማጠናከር ታሳቢ ተደርጎ የተገነባ ነው፤
💫10,000 የፍራፍሬ ተክሎች ካረፉበት የፍራፍሬ ፓርክ ጀምሮ እስከ ዋናው የግመል ፓርክ ድረስ፤ እያንዳንዱ የሪዞርቱ ገጽታ የኢትዮጵያን ተፈጥሯዊና ባህላዊ ሐብት የሚያንፀባርቅ ነው፣
⏺በ51 የተጠናቀቁ የመኝታ ክፍሎችና በዓለም አቀፍ ደረጃ በሚገኙ የቱሪዝም አገልግሎቶች እውን የሆነው ሸበሌ ሪዞርት፤ ኢትዮጵያን በአፍሪካ ቀዳሚ የቱሪስት መዳረሻ ለማድረግ በሚደረገው ጉዞ ውስጥ ትልቅ ታሪካዊ እጥፋት ነው፤
ይህ ፕሮጀክት ህልምን ወደ እውነት የመለወጥ፤ የኢትዮጵያን የተፈጥሮና የባህል ጸጋዎች መላው ዓለም የሚካፈለው ቅርስ የማድረግ የመደመር መንፈስ በተግባር የታየበት ታላቅ ስራ ነው፡፡
Via PMO Ethiopia
@etconp
❤13
👉ዱባይ በወርቅ መንገድ ልትገነባ ነው
🚧ይህ በዓለም የመጀመሪያው ነው ጉዳዩም መነጋገሪያ ሆኗል።
⏺መሪዎቿ ዱባይ በዓለም የመጀመሪያው የወርቅ ጎዳና መገኛ ትሆናለች።
⏺ዱባይ ብዙ ጊዜ "የወርቅ ከተማ" የሚል ቅጽል ስም ትሰጣለች ምክንያቱም በዓለም ላይ ካሉት ትላልቅ የወርቅ መገበያዎች ከተሞች አንዷ በመሆኑ ነው።
⏺አሁን ጭራሽ መንገድ ልትሰራበት ነው።
@etconp
🚧ይህ በዓለም የመጀመሪያው ነው ጉዳዩም መነጋገሪያ ሆኗል።
⏺መሪዎቿ ዱባይ በዓለም የመጀመሪያው የወርቅ ጎዳና መገኛ ትሆናለች።
⏺ዱባይ ብዙ ጊዜ "የወርቅ ከተማ" የሚል ቅጽል ስም ትሰጣለች ምክንያቱም በዓለም ላይ ካሉት ትላልቅ የወርቅ መገበያዎች ከተሞች አንዷ በመሆኑ ነው።
⏺አሁን ጭራሽ መንገድ ልትሰራበት ነው።
@etconp
👏8❤5
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● Concrete Admixtures
● Bonding Agents
● Waterproofings
● Wall Putty, Prime Coat
● Concrete Repair Mortar
● Floor hardener, Epoxy
● Grout, Self-level mortar
● Quartz paint, Contextra
● Tile Adhesive & Tile Joint Fillers
● Geotextiles and other construction chemicals and materials
☎️ Tel: 0961955555
🔹 Address 1: Signal road, around
Dinberwa Hospital
🔹 Addres 2: Wellosefer, Infront of
Dani Plaza
❤1
3155. Which station is primarily used for train overtaking?
Anonymous Quiz
16%
(a) Junction station
16%
(b) Flag station
30%
(c) Crossing station
38%
(d) Terminal station
❤4
3153. In earthen dam at the entry point, the phreatic line must be normal to the
Anonymous Quiz
15%
(a) Directrix
16%
(b) Focus
46%
(c) Upstream face
22%
(d) Downstream dam
👍4
3152. Assertion (A): Subgrade soil must have good drainage properties.
Reason (R): Good drainage helps reduce moisture retention and frost action.
Reason (R): Good drainage helps reduce moisture retention and frost action.
Anonymous Quiz
21%
(a) Both A and R are true, but R is not the correct explanation of A.
16%
(b) A is true, but R is false.
51%
(c) Both A and R are true, and R is the correct explanation of A.
12%
(d) A is false, but R is true.
❤2👏2
3151. Which of the following describes the requirements, dimensions, materials and procedures that are used to achieve the construction of any building?
Anonymous Quiz
12%
(a) Description of contract
58%
(b) Specification
28%
(c) Bill of quantities
3%
(d) Schedule of rates
❤6👏3
3149. In construction cost estimate and valuation, 'plinth area estimate' is commonly used for which of the following purposes?
Anonymous Quiz
62%
(a) Quick estimation of building cost based on built-up area
16%
(b) Calculating only the foundation cost
11%
(c) Industrial construction projects
11%
(d) Estimating the cost of roads and bridges
❤10👍2
3147. What is the maximum permissible vertical deflection under live load for purlins supporting brittle cladding in an industrial building, according to IS: 800 – 2007?
Anonymous Quiz
31%
(a) Span/180
35%
(b) Span/240
21%
(c) Span/500
12%
(d) Span/300
❤2👍2
3146. Which factors influence the short-term deflection of a slab in the limit state of serviceability?
Anonymous Quiz
21%
(a) Span length and aggregate size
12%
(b) Age of concrete and water-cement ratio
19%
(c) Creep and shrinkage of concrete
48%
(d) Magnitude of live loads, amount of steel reinforcement, and concrete strength
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ACI 117-10 — Tolerances for Cast-in-Place Concrete Section 4: (pages. 31–44)
Even the best construction sites can’t achieve absolute perfection and that’s why ACI 117-10 defines allowable tolerances to ensure quality, safety, and constructability.
Here’s a concise, field-focused breakdown of Section 4
🔹 4.1 – Deviation from Plumb
Definition:
How much a vertical element (column or wall) may lean from a true vertical line.
ACI Limit:
±25 mm per 3 m (10 ft) of height
Maximum ±50 mm total
For architectural concrete: ±6 mm per 3 m
Example:
Column height = 4.5 m → (4.5 ÷ 3) × 25 = 37.5 mm
→ The column can lean up to 37 mm from vertical.
If measured by theodolite and the top is 20 mm off the base → ✅ within tolerance.
🔹 4.2 – Deviation from Location
Definition:
Horizontal offset from the designed grid or layout line.
ACI Limit:
±25 mm for structural members (columns, walls, footings)
±13 mm for architectural or tight-fit elements
Example:
Design gridline at X = 10,000 mm → actual = 10,018 mm → shift = 18 mm → ✅ acceptable.
🔹 4.3 – Not Used
Reserved for future use - no requirements in ACI 117-10.
🔹 4.4 – Deviation from Elevation
Definition:
Difference between the actual top elevation and the specified design elevation.
ACI Limit:
±13 mm for general structural surfaces
±6 mm for architectural or critical connections
Example:
Design top of slab = +100.000 m
Actual = +100.011 m → difference = +11 mm → ✅ within tolerance.
🔹 4.5 – Deviation from Cross-Sectional Dimensions
Definition:
Difference between actual and design dimensions (width, thickness, or depth).
ACI Limit:
Structural: +13 mm / –6 mm
Architectural: ±6 mm
Example:
Design wall thickness = 200 mm
Measured = 207 mm → +7 mm → ✅ OK
Measured = 192 mm → –8 mm → ❌ exceeds tolerance.
🔹 4.6 – Formed Openings (Width/Height)
Definition:
Tolerance for door, window, or duct openings.
ACI Limit: ±13 mm both directions
Example:
Design = 500 × 400 mm → measured = 510 × 392 mm → ✅ within ±13 mm.
🔹 4.7 – Stair Risers and Treads
Definition:
Ensures uniform step height and tread width for safety and comfort.
ACI Limit:
Riser variation: ±6 mm between adjacent steps
Tread variation: ±6 mm
Total cumulative variation ≤ 13 mm per flight
Example:
Risers = 171, 169, 172, 170 mm → max difference = 3 mm → ✅ acceptable.
🔹 4.8 – Deviation from Slope or Plane
Definition:
Controls flatness and intended slope on horizontal surfaces (floors, ramps, roofs).
ACI Limit:
±6 mm in 3 m for interior floors
±13 mm in 3 m for exterior or drainage surfaces
Example:
Design ramp slope = 2% → expected height diff = 60 mm per 3 m
Measured = 63 mm → ✅ within tolerance.
🔹 4.9 – Sawcut Depth (Slab-on-Ground)
Definition:
Depth of contraction joints (sawcuts) used to control cracking.
ACI Requirement: Minimum = ¼ of slab thickness
Example:
Slab thickness = 150 mm → required sawcut = 38 mm
Actual cut = 40 mm → ✅ OK
Cut = 25 mm → ❌ too shallow → may cause random cracks.
Via Yonatan Tadesse, PMP®️
If you want ACI 117-10 pdf document comment and it’ll be provided.
https://t.me/ETCONp
#CIPConcreteTolerances #CastInPlaceTolerances #ACI11710Tolerances #ConcreteTolerances #ConcreteTech #CivilEngineering #QualityControl
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◇ በፋይበርግላስ የተሰራ የውሃ ሴፕቲክ ታንክ በጉድጓድ ዉስጥ ከሚመጣ የሽንት ቤት ፍሳሾች ሙሉ ለሙሉ የተከለለ ስለሚሆን ለዉሀ ብክለት አስተማማኝ ነዉ ።
◇በፋይበርግላስ የተሰራ የውሃ ሴፕቲክ ታንክ መበስበስ እና መሰነጣጠቅ የሚባል ነገር ፈፅሞ አይታሰብም።
◇በፋይበርግላስ የተሰራ የውሃ ሴፕቲክ ታንክ ለማፅዳት በቀላሉ የሚመች ሲሆን ፣ በዉሀ ዉስጥ በፍጥነት ለሚራባዉ አልጌ ደግሞ ፈፅሞ የማይመች ነዉ ።
◇በፋይበርግላስ የተሰራ የውሃ ሴፕቲክ ታንክ ከመሬት በታች በጉድጎድ ዉስጥ ስለሚሰራ ቦታ ቆጣቢ ነዉ።
◇ለመዋኛ ገንዳ
◇ ለመኖሪያ ቤቶች ፣፤ሪል እስቴቶች ፤ድርጅቶች ፤ሆስፒታሎች፥ ሆቴሎች ፥ ኤምባሲዎች፥የእርሻ ቦታዎች ፥ኢንዱስትሪ ፓርኮች ወዘተ የኛ ተጠቃሚዎች ናቸዉ።
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Ab Con General Waterproofing Works
የውሃ አቅርቦትዎን በከፍተኛ ደረጃ ለመጨመር በፋይበርግላስ የውሃ ማጠራቀሚያ ሴፕቲክ ታንክ ስርዓታት ይጠቀሙ !!!
◇ በፋይበርግላስ የተሰራ የውሃ ሴፕቲክ ታንክ በጉድጓድ ዉስጥ ከሚመጣ የሽንት ቤት ፍሳሾች ሙሉ ለሙሉ የተከለለ ስለሚሆን ለዉሀ ብክለት አስተማማኝ ነዉ ።
◇በፋይበርግላስ የተሰራ የውሃ ሴፕቲክ ታንክ መበስበስ እና መሰነጣጠቅ የሚባል ነገር ፈፅሞ አይታሰብም።
◇በፋይበርግላስ የተሰራ የውሃ ሴፕቲክ ታንክ ለማፅዳት በቀላሉ የሚመች ሲሆን ፣ በዉሀ ዉስጥ በፍጥነት ለሚራባዉ አልጌ ደግሞ ፈፅሞ የማይመች ነዉ ።
◇በፋይበርግላስ የተሰራ የውሃ ሴፕቲክ ታንክ ከመሬት በታች በጉድጎድ ዉስጥ ስለሚሰራ ቦታ ቆጣቢ ነዉ።
◇ለመዋኛ ገንዳ
◇ ለመኖሪያ ቤቶች ፣፤ሪል እስቴቶች ፤ድርጅቶች ፤ሆስፒታሎች፥ ሆቴሎች ፥ ኤምባሲዎች፥የእርሻ ቦታዎች ፥ኢንዱስትሪ ፓርኮች ወዘተ የኛ ተጠቃሚዎች ናቸዉ።
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