👉ADVANCE PAYMENT
IN CONSTRUCTION CONTRACTS

💫WHAT IS ADVANCE PAYMENT?

⏺Advance payment is a sum of money paid by the employer (client) to the contractor before the actual commencement of work.

🔗KEY POINTS

📌 Purpose

  - To help the contractor with initial cash flow
  - To mobilize labor, equipment, and materials

📌Payment Terms

  - Usually expressed as a percentage of the contract value (commonly 5–30%)
  - Paid after signing the contract and sometimes after furnishing bank guarantee

📌Recovery

  - Advance payment is not free money
  - It is recovered gradually from running bills or progress payments of the contractor

📌 Security

  - Contractors often provide a bank guarantee or surety bond equal to the advance amount to protect the client if the work is not completed.

@etconp

👉የግንባታ ስራ ክፍያ (payment) ለመውሰድ ወደ ቢሮው የሚመጡ ስራ ተቋራጮች ሊያሟሏቸው የሚገቡ ቅድመ ሁኔታዎች ከላይ በምስሉ ተቀምጧል።

@etconp

👉 INTERCON Construction Chemicals 

● 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

👉Types Of Scaffolding

💫Scaffolding in building construction comes in several types, each designed for specific site conditions, heights, and work requirements.

🏷Here’s a clear breakdown so you can understand when and why each type is used:

🧱 1. Single Scaffolding (Bricklayer Scaffolding)
Used mainly for brick masonry work
Consists of standards (verticals), ledgers (horizontals), and putlogs
Putlogs are inserted into holes in the wall
Simple and economical, but depends on wall strength

🧱 2. Double Scaffolding (Mason Scaffolding)
Used for stone masonry
Two rows of scaffolding → more stable
No need to make holes in the wall
Stronger than single scaffolding

🏗️ 3. Cantilever Scaffolding
Supported on needles (projecting beams) from the building
Used when:
Ground is weak
Obstruction at ground level
Needs careful design (can be risky if not done properly)

🔩 4. Suspended Scaffolding
Platform is hung from roof with ropes or chains
Can be raised/lowered
Common for:
Painting
Window cleaning
Not for heavy loads

⚙️ 5. Trestle Scaffolding
Supported on tripods or movable ladders
Used indoors up to about 5 meters height
Light-duty work like painting or repairs

🛞 6. Mobile Scaffolding
Mounted on wheels (casters)
Easy to move around site
Must lock wheels before use for safety

🔧 7. Steel Scaffolding
Made of steel tubes and couplers
Strong, durable, reusable
Common in modern construction
Higher cost but safer and long-lasting

🪵 8. Bamboo Scaffolding
Made from bamboo
Cheap and flexible
Common in some countries (less in modern large projects)
Needs skilled tying for safety

@etconp

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👉HOW TO CHECK QUALITY OF CEMENT AT SITE?

💫Cement is one of the most important materials used in construction.

⏺The strength of a structure depends upon several factors,
cement quality is one of them. To achieve the desired strength of concrete and to increase the longevity of structure good quality cement
should always be used.
So it is important to check the quality of cement before using. In our previous article, we have already discussed the different types of cement and their uses in construction.

🚧Today we will discuss how to check the quality of cement at site.

⏺To check the quality of cement we need to pass some easy tests which are described
below.

🏷To check the quality of cement we need to pass some easy tests which are described
below:

1. DATE OF PACKING:

The strength of cement decreases with time.
First of all, check the manufacturing date in the bag before using.
Generally, cement should be used before 90 days from the manufacturing date.
The percentage of strength loss of cement is given in the below

❇️Age of cement % reduction of strength

3 months 20-30
6 months 30-40
12 months 40-50

2. CEMENT COLOR:

The cement should be uniform in color.
Good quality cement should have gray color with greenish shade.

3. CHECK FOR LUMPS:

No lumps should be present in the cement.
Lumps are formed due to absorption of moisture from the climate.

4. RUBBING TEST:

Cement should feel smooth while rubbing in between fingers.
If it gives a rough feeling that means cement is mixed with sand.

5. TEMPERATURE TEST:

Simply insert your hand into the cement bag, it should give a cool feeling if its quality is
good. Otherwise, you may feel warm because of hydration reaction.

6. FLOAT TEST:

Take some amount of cement and throw it in water.
The cement should float for sometimes before it sinks in the water.

7. SETTING TEST:

Make a thick cement paste with water and immerse it in water for 24 hours.
It should be set and should not develop cracks.

8. STRENGTH TEST:

Prepare a cement block of 25 mm x 25 mm and 200 mm in length.
Also submerge it in water for 7 days.
then place it on supports 15 cm apart and load it with 34 kg weight.

A block made from good cement will not show any signs of failure.

@etconp

👉 INTERCON Construction Chemicals 

● 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

👉What is PPE

💫PPE (Personal Protective Equipment) means protective gear worn by workers to reduce risk of injury or illness, especially on construction sites like the ones you work on.

🪖 Head Protection

Hard hat (helmet) protects from falling objects and head impact
Some types also protect against electric shock
Must be worn all the time on site

👷 Eye & Face Protection

Safety goggles → protect from dust, sand, cement
Face shield → protects full face from sparks and chemicals
Welding mask → protects eyes from strong light and heat

👂 Hearing Protection

Ear plugs / ear muffs protect from loud noise
Important near:
Generators
Jackhammers
Heavy machines

😷 Respiratory Protection

Dust masks / respirators protect lungs
Used when:
Mixing cement
Cutting blocks
Working in dusty areas

🦺 Body Protection

Reflective vest (high-visibility)
Makes you easy to see, especially around machines or traffic

🧤 Hand Protection

Gloves protect from:
Cuts (rebar, nails)
Cement burns
Chemicals

👢 Foot Protection

Safety boots (steel toe) protect from:
Falling materials
Nails on ground
Very important for site injuries like foot puncture

🔑 Why PPE is Important

Prevents serious injuries and death
Required by safety rules on every construction site
Protects you from:
Physical injury
Dust and chemicals
Noise damage

⚠️ Important Tips

Always wear PPE before entering site
Check if it is not damaged
Use the right PPE for the job (not one for everything)

#FirstSafety

@etconp

👉Superelevation in Highway Design

🚧Superelevation is the transverse slope provided to a roadway at curves to counteract the centrifugal force acting on vehicles.

It ensures safety, comfort, and proper drainage while maintaining smooth traffic flow.

⭐️Key Stages of Superelevation Transition:

- Normal Section (Crown): Roadway with standard cross slope (0–5%).
- Runout Section: Gradual reduction of slope from normal crown to flat.
- Level Crown: Road surface becomes flat (0%).
- Reverse Crown: Opposite slope introduced to prepare for curve.
- Spiral Transition: Smooth change from flat to full superelevation.
- Full Superelevation: Maximum slope (up to 5–10%) achieved on the curve.

🏷Objectives:

- Prevent skidding and overturning on curves.
- Enhance driver comfort and vehicle stability.
- Maintain effective drainage.
- Provide a safe transition between tangent and curve.
- Meet geometric design standards for highways.

@etconp

👉የግንባታ ኮንትራት ዋና ዋና ቃላትና ትርጓሜዎቻቸው በአጭሩ የሚከተሉት ናቸው:-

1. የስራ መጠን ለውጦች (Variations)

- ኦሚሽን (Omission): የታቀደ ስራ ሲቀነስ ወይም ሲሰረዝ (ዋጋ ይቀንሳል)።

- አዲሽን (Addition): አዲስ ስራ ወይም ተጨማሪ መጠን ሲጨመር (ክፍያ ይጨምራል)።

- ቫሪዬሽን ኦርደር (VO): በዲዛይን ወይም በስራ መጠን ላይ ለውጥ ለማድረግ የሚሰጥ መደበኛ ትዕዛዝ።


2. የጊዜና የክፍያ ማበረታቻዎች/ቅጣቶች

- ቦነስ (Bonus): ስራው ከቀጠሮው በፊት ሲጠናቀቅ ለኮንትራክተሩ የሚሰጥ ሽልማት።

- ፔናልቲ (Penalty/LD): ስራው በጊዜ ካልተጠናቀቀ ከኮንትራክተሩ የሚቀነስ ቅጣት።

- የጊዜ ማራዘሚያ (EOT): ከኮንትራክተሩ ቁጥጥር ውጭ በሆኑ ምክንያቶች ለስራው የሚታከል ተጨማሪ ጊዜ።

- የዋጋ ለውጥ (Escalation): የጥሬ ዕቃዎች ወይም የነዳጅ ዋጋ በገበያ ላይ ሲጨምር የሚደረግ የዋጋ ማስተካከያ።

3. የክፍያ ዓይነቶችና ዋስትናዎች

- አድቫንስ (Advance): ስራ ለመጀመር ቅድሚያ የሚሰጥ ክፍያ (ከ10% - 20%)።

- ኢንተሪም ክፍያ (IPC): በየወሩ ለተከናወነ ስራ የሚከፈል ጊዜያዊ ክፍያ።

- ሪቴንሽን (Retention): ለጥራት ዋስትና ከእያንዳንዱ ክፍያ የሚቀነስ ገንዘብ (5% - 10%)።

- ፐርፎርማንስ ቦንድ: ኮንትራክተሩ ስራውን በአግባቡ ለመጨረሱ የሚይዘው የባንክ ዋስትና።

- የመጨረሻ ክፍያ (Final Payment): ፕሮጀክቱ ተጠናቆ ርክክብ ሲደረግ የሚፈፀም ክፍያ።


4. ከርክክብ በኋላ ያለ ኃላፊነት

- የጉድለት ኃላፊነት ጊዜ (DLP): ስራው ካለቀ በኋላ ባሉት 6 ወይም 12 ወራት ውስጥ የሚታዩ ብልሽቶች ኮንትራክተሩ በነፃ የሚያስተካክልበት ጊዜ።

@etconp

👉Slab Concrete Calculation – Ground Floor Example

💫1. Read Drawing & Data

- Plan Size: 6.00 m × 4.00 m
- Slab Thickness: 150 mm
- Staircase Opening: 2.50 m × 1.20 m

💫2. Gross Slab Area

- Total area of the slab before deductions.

💫3. Opening Area

- Area of staircase or other voids.

💫4. Net Slab Area

- Gross area minus openings.

💫5. Thickness Conversion

- Convert slab thickness into meters.

💫6. Concrete Volume

- Multiply net area by thickness.

💫7. Add Wastage

- Include 3–5% extra for handling and site loss.

✅Final Requirement

- Slab Concrete Needed ≈ 3.31 m³
- Always deduct openings (stairs, lifts, ducts) before calculating volume.

📜Caption

🔨 Precision in calculation ensures strength in construction. Every cubic meter counts when building the future!

#ConcreteAndSteel #ConstructionDetails #SlabDesign
#SiteWork #EngineeringEducation

@etconp