👉Ultrasonic Pulse Velocity Concrete test/UPV test/

💫UPV ኮንክሪት ቴስት ምንድነው?

⏺የኮንክሪት ስትራክቸሩ ላይ ምንም አይነት ተቆርጦ የሚወጣ ሳምፕል ሳይወሰድ/Nestructive test (NDT)/ የሚሰራ ነው።

▶️በኮንክሪት ውስጥ የሚሄድ የድምፅ ማዕበል/Saund Wave/ Ultrasonic pulse/ ፍጥነትን በመለካት ስለኮንክሪቱ የጥራት ደረጃ/Overall Quality/ ይነግረናል።

🎲ይኽውም:-

1.ወጥነት ያለው የኮንክሪት ጥራት መኖሩን/Check uniformity in different parts of the concrete structure/

2.የግድፈቶችን አካቢዎችን ይለይልናል/Defects like Crack, Voids, honeycombing, or Poor compaction/

3.በሌላ መልኩ የኮንክሪት ጥንካሬውን ደረጃ ለማወቅ ይረዳል።/Estimate quality of Concrete indirectly/

ውጤቱ የሚያሳየው:
i) ፈጣን ድምፅ ሞገድ/Fast wave travel/ከሆነ:
ኮንክሪቱ በቂ እፍግታ ያለው መሆኑንና ወጥና ጥራት ያለው  ሙሊት መኖሩን ይነግረናል።

ii) ዘገምተኛ የድምፅ ሞገድ/Slow velocity sound wave/ከሆነ: በተቃራኒ ሆኖ በተጨማሪም በኮንክሪቱ የውስጥ ክፍል ላይ ክራክ/Severe cruck, voids ወይም honeycombingና በአጠቃላይ ደካማ የኮንክሪት ክፍል/Weak zone/ መኖሩን ይጠቁመናል ማለት ነው

UPV ቴስት በአብዛኛው ሀመር ቴስትን ተክቶ ሊሰራ የሚችል ሲሆን ተደራቢ ሙከራ ሆኖ ሊያገለግል ይችላል። የUPV ቴስት ውጤትን ተከትሎ እንደሁኔታው Core Test ማድረግ አስገዳጅ ሊሆን ይችላል።

UPV ቴስት የኮንክሪትን አጠቃላይ የኮንክሪት ጥራት ደረጃን ለመገምገም ቀላልና ፈጣኑ የቴስት ዓይነት ነው።

@etconp

“Recovery schedules in construction”

@etconp👇

👉“Recovery schedules in construction”

💫Recovery schedules are not just updated programs—they're your strategic response to delay, and a commitment to realignment.

🚧Here are the key steps to prepare a proper Recovery Schedule:

1. Remove the Assigned

⏺Baseline Detach the current baseline to allow a clean slate for schedule modifications.

2. Incorporate Approved Scope Changes

⏺Reflect any client-approved changes in the schedule that impact the timeline or resources.

3. Fix Out-of-Sequence Activities

⏺Review the logic and correct any activities that are not following a logical sequence.

4. Adjust Project and Milestone Dates

⏺Use schedule compression techniques like crashing (more resources) or fast-tracking (parallel activities) to meet revised deadlines.

5. Update Remaining Early Start Dates

⏺Reset early start dates of in-progress activities to reflect a realistic continuation from the current data date.

6. Cost Loading (if applicable)

⏺Adjust or include cost data for relevant activities to maintain alignment between cost and schedule.

7. Fix Remaining Durations

⏺Eliminate decimal durations to simplify calculations and enhance clarity.

8. Update Actual Start Dates

⏺Make sure all actual start dates are accurate for in-progress tasks based on current progress.

9. Perform Global Changes

⏺Apply logical, approved global changes to clean up the schedule and align planned vs actual durations and dates.

10. Monitor and Iterate
Continuously review

⏺performance against the recovery schedule and adjust based on new developments or risks.

💫Tip: Always support your recovery schedule with a narrative explaining what changed, how recovery will be achieved, and why the revised plan is credible.

🏷For Ms Project Tuetorial Visit Our YouTube Channel👇

https://youtube.com/@ethiopianconstruction?si=YPBAC3MRTl5Uu6BK

Via Yonatan Tadesse, PMP®

@etconp

🏷በ2018 ዓ.ም አንደኛ ሩብ ዓመት ተግባራዊ የሚደረግ የግንባታ ሥራዎች ይፋዊ ቀጥተኛ ዋጋ ተመን (1st Quarter Construction Works of Direct Cost)

🔑በተለይ የዋጋ ተመን (BOQ - Priced bill of Quantities) ለምታወጡ የዲዛይን አማካሪዎች እና የፕሮጀክት መሐንዲሶች ይጠማችኋል።

💫በሌሎች የሀገሪቱ ክፍሎች የምትገኙ የኮንስትራክሽን ባለሙያዎችም እንደመነሻ ሀሳብ ይጠቅማችኋል።

🏷YouTube👇
https://youtube.com/@ethiopianconstruction?si=YPBAC3MRTl5Uu6BK

🌟Vacancy And Tender👇
https://t.me/ETCONpWORK

@etconp

👉Colloidal silica is a suspension of fine silica (silicon dioxide) particles in a liquid, usually water.

@etconp 👇

👉Colloidal silica

⭐️Colloidal silica is a suspension of fine silica (silicon dioxide) particles in a liquid, usually water.

⏺Its history dates back to the mid-20th century, with the first patent granted in 1959.

🎲These nanoparticle silica sols exhibit unique properties due to their small size (typically 5 to 100 nanometers) and high surface area, making them valuable in many applications, including construction.

📜History and Chemical Composition

⏺Colloidal silica was first introduced as a technical material by Bryan H. Green in the United States in the late 1950s.

⏺It consists of amorphous, nonporous, typically spherical silica particles dispersed in water.

⏺The particles carry a negative surface charge, stabilized by pH adjustment or additives.

⏺The chemical composition is primarily silicon dioxide (SiO2), with some variations where silicon atoms may be partially replaced by aluminum to enhance stability.

⏺The particles are produced through polymerization of silica nuclei from silicate solutions under alkaline conditions.

📍Advantages of Colloidal Silica in Ethiopia

❇️Using colloidal silica in construction in Ethiopia offers several advantages:

• Enhanced strength and durability of concrete structures, important for infrastructure development.
• Pore water reduction, free alkali content reduction, reduction in permeability and improved resistance to environmental damage, which is valuable in Ethiopia’s varied climates.
• Faster curing times aiding accelerated project timelines.
• Potential economic benefits by reducing maintenance costs and improving lifespan of buildings and roads.

📍Resources in Ethiopia for Production

⏺Ethiopia has abundant natural resources suitable for producing colloidal silica.

▶️Notably, the Jema River region holds extensive silica sand reserves, which can be processed to produce high-quality silica materials.

🔰Establishing local production facilities could reduce reliance on imports, lower costs, create jobs, and support Ethiopia’s growing industrial and construction sectors.

⏺The availability of local silica sand combined with emerging processing technologies makes Ethiopia a promising location for colloidal silica manufacture.
In summary, colloidal silica is a nanoscale silica suspension with a proven ability to improve construction materials’ strength and durability.

⏺Ethiopia’s natural silica resources offer opportunities for local production, which could greatly benefit the construction industry and economic development.

⏺The integration of colloidal silica as an additive in Ethiopian construction projects can enhance infrastructure quality and longevity while fostering domestic industrial growth.

Via Yonatan Tadesse, PMP®

@etconp

ADVERTISMENT

ታምራት ፕሌት እና ጄ ቦልት አቅራቢ

✅የምንሰጣቸው አገልግሎቶች

🔅 ፕሌት any Size & thickness
🔅 ጄ ቦልት (ጥርስ ማዉጣትና ማጠፍ)

🔅 የተለያዩ  [modefic] ስራዎችን እንሰራለን።

♦️ ማንኛዉንም ብረታ ብረት እንገዛለን።

☎️ስልክ 0904040477 ወይም 0911016833 ደውለው ያግኙን
📱ቴሌግራም ላይ ፦https://t.me/heavenic1

አድራሻ፦  ቁ 1.መርካቶ
                ቁ.2 አየር ጤና  ኪዳነ ምህረት

ጥራትና ታማኝነት መለያችን ነው።
ታምራት ፕሌት እና ጄ ቦልት አቅራቢ

👉Types of Culverts

🚧1.Pipe Culvert

⏺Circular, Elliptical, or Pipe Arch shape. Made of concrete, steel, or PVC. Used for small streams or drainage under roads.

⏺Easy to install and cost-effective.

🚧2.Box Culvert

⏺Rectangular or square in shape, made of RCC.

⏺Used for large discharges and urban drainage.

⏺Can carry road traffic directly above.

🚧3.Arch Culvert

⏺Arch-shaped structure made of stone masonry, brick, or RCC.

⏺Used for moderate flow and offers aesthetic appeal.

🚧4.Slab Culvert

⏺RCC slab over masonry or concrete abutments.

⏺Used for small spans (up to 3 m).

⏺Simple and economical for short crossings.

🚧5.Bridge Culvert

⏺Combination of bridge and culvert structure.

⏺Used for large spans and heavy flow areas.

⏺Acts both as a bridge and a culvert.

🚧6.Pipe Arch Culvert

⏺Arch-like pipe with a wide bottom, used when headroom is limited but wide flow is needed.

⏺Better hydraulic efficiency than circular pipes.

🚧7.Scupper Culvert

⏺Used to drain water from bridge decks or roads.

⏺Usually small openings along bridge sides.

#CulvertDesign #CivilEngineering #BridgeConstruction #RoadDrainage #PipeCulvert #BoxCulvert #ArchCulvert #SlabCulvert #BridgeCulvert #ConstructionTechnology #HydraulicStructure #WaterFlowControl #InfrastructureDesign #EngineeringStudy #sitework #civil #civilservice #civilrights #civilengineering

@etconp

👉Book Highlight: “Principles of Measurement (International) For Works of Construction, June 1979”

Even though it was written at 1979 this book sets standardized principles for measuring construction works globally. It remains highly relevant today for engineers, quantity surveyors, and project managers. Key uses include consistent quantity measurement, transparent contract administration, accurate bill of quantities (BOQ) preparation, and supporting international project collaboration.
Key Principles of Measurement from the Book:

📖 Clear Definition of Measurement Units: The book defines standard units for measurement to avoid ambiguity, ensuring all parties understand the quantities involved.

📖 Uniform Measurement Methods: It prescribes consistent rules on how to measure different works such as earthworks, concrete, finishes, and services.

📖  Inclusion and Exclusion Rules: The book clearly states what should be included or excluded in measurements to prevent disputes, such as whether wastes, overlaps, or deductions apply.

📖 Basis for Contract Payment: The measured quantities form the basis for contractor payments, making accuracy critical for fair financial transactions.

📖  International Applicability: Standards enable smoother communication and comparison in multinational construction projects.

🏢 By following these principles, construction projects achieve improved accuracy, fairness, and efficiency from tendering through to final account settlement.

We have attached the pdf of this resource for you.
 
Via Yonatan Tadesse, PMP®
@etconp

👉Fresh concrete cracking Few Hours after casting is a common issue, typically caused by plastic shrinkage, early drying, or improper curing. Here’s a breakdown of why it happens and the solutions to prevent it:

🔍 Reasons Why Concrete Cracks After Few Hours

🏷Plastic Shrinkage Cracks

⏺Occurs when water evaporates too quickly from the surface.
⏺Common in hot, dry, or windy conditions.
⏺The surface dries faster than the inner concrete, causing shrinkage and cracking.

🏷Rapid Drying / Lack of Curing

⏺Without proper curing, moisture evaporates too fast.
Causes the concrete to shrink and crack prematurely.

🏷Excessive Water in Mix (High Water-Cement Ratio)

⏺More water = more bleeding (water rises to the surface).

⏺Leads to weak surface and higher shrinkage, which causes cracks as it dries.

🏷Settlement Cracks

⏺If concrete settles unevenly due to:Inadequate compaction.
Obstructions (like rebar) preventing uniform settlement.

🏷Temperature Effects

⏺High ambient temperatures accelerate water loss and hydration.
⏺Early thermal stresses can cause cracking before concrete gains strength.

💫Solutions to Prevent Cracking

🔰Proper Curing (Start Early!)
Begin curing as soon as surface hardens (within a few hours).

🔰Use: Wet hessian/jute cloths
Water spraying
⏺Curing compounds
Plastic sheeting

❇️Control the Environment
Avoid casting in: Very hot,Windy,Dry weather
⏺Use sunshades, windbreaks, or misting to reduce evaporation.

🔰Adjust Mix Design

⏺Use a low water-cement ratio.
⏺Add admixtures like water reducers or retarders to improve workability without excess water.
⏺Use Evaporation Retardants
Spray these over concrete right after screeding to slow moisture loss.
⏺Apply Control Joints
Cut joints within 6–12 hours (or as specified) to allow controlled cracking.
⏺Proper Compaction and Finishing
⏺Ensure vibration and finishing are done correctly to avoid air pockets and segregation.

@etconp