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👉Designing a subbase mix for road construction involves selecting materials, determining proportions, and ensuring the mix meets strength, stability, and durability requirements.

⏺The subbase lies beneath the base course and above the subgrade, providing structural support and load distribution. Below is a concise guide to designing a subbase mix:

💫1. Understand Project Requirements
   - Traffic Load: Consider the expected traffic volume and axle loads (e.g., heavy trucks, light vehicles).
   - Climate: Account for freeze-thaw cycles, moisture, and drainage needs.
   - Specifications: Follow standards like AASHTO, ASTM, or local road authority guidelines (e.g., CBR, gradation).
   - Subgrade Conditions: Assess the subgrade’s strength (e.g., California Bearing Ratio, CBR) to determine subbase thickness and material.

💫2. Select Materials
   - Common Materials:
     - Granular Materials: Crushed stone, gravel, or sand.
     - Recycled Materials: Crushed concrete, reclaimed asphalt pavement (RAP).
     - Stabilized Materials: Cement, lime, or fly ash-treated aggregates for enhanced strength.
   - Quality Requirements:
     - Hard, durable aggregates with low abrasion loss (e.g., Los Angeles Abrasion < 40%).
     - Angular particles for better interlocking.
     - Low plasticity (non-cohesive materials, Plasticity Index < 6).

💫3. Determine Gradation
   - Use well-graded aggregates to maximize density and stability.
   - Typical gradation for subbase (per AASHTO or local standards):
     - Sieve Size | % Passing
     - 2 in (50 mm) | 100%
     - 3/4 in (19 mm) | 70–100%
     - No. 4 (4.75 mm) | 40–70%
     - No. 200 (0.075 mm) | 5–15% (to minimize fines and ensure drainage).
   - Adjust gradation based on local availability and project needs.

💫4. Test Material Properties
   - CBR Test: Ensure the subbase has adequate strength (e.g., CBR > 20–30 for granular subbase, higher for stabilized).
   - Moisture-Density Relationship: Conduct Proctor tests (AASHTO T99/T180) to determine optimum moisture content (OMC) and maximum dry density (MDD).
   - Permeability: Ensure good drainage (e.g., permeability > 10^-4 cm/s for granular subbase).

💫5. Stabilization (If Needed)
   - Cement Stabilization: Add 3–6% cement by weight for high strength (e.g., UCS > 300 psi).
   - Lime Stabilization: Use 2–5% lime for cohesive soils to reduce plasticity and improve workability.
   - Fly Ash or Bitumen: For specific soil types or environmental considerations.
   - Conduct trials to determine the optimal stabilizer percentage.

💫6. Mix Design Process
   - Proportioning:
     - Blend aggregates to achieve the desired gradation.
     - Use trial mixes to balance coarse and fine aggregates.
   - Moisture Content:
     - Mix at or near OMC to achieve maximum compaction.
   - Compaction:
     - Compact to 95–100% of MDD using rollers (e.g., vibratory or static).
   - Trial Batches:
     - Prepare small-scale mixes and test for CBR, density, and stability.
     - Adjust proportions if needed.

💫7. Field Implementation
   - Mixing:
     - Use a central mixing plant or in-place mixing (e.g., pugmill or road reclaimer).
     - Ensure uniform blending of aggregates and stabilizers.
   - Placement:
     - Spread the mix in layers (typically 4–8 in. thick) using a grader.
     - Maintain proper moisture during placement.
   - Compaction:
     - Use vibratory rollers for granular materials or sheep-foot rollers for stabilized mixes.
     - Check density with a nuclear gauge or sand cone test.
   - Curing (for stabilized subbase):
     - Keep moist for 7 days (cement/lime) or as specified.

💫8. Quality Control
   - Verify gradation, moisture, and density during construction.
   - Conduct field CBR or plate load tests to confirm strength.
   - Ensure proper drainage to prevent water accumulation.
💫9. Documentation
   - Record mix proportions, test results, and field compaction data.
   - Submit reports to meet project specifications.

@etconp

👉Effective Tender Management: A Comprehensive Guide

🏷Tender management is a critical process that requires careful planning, precise execution, and meticulous evaluation.

⏺A well-managed tender process ensures that projects are awarded to the most suitable contractors, minimising risks and maximising value for money. In this article, we will delve into the intricacies of tender management, exploring best practices, common pitfalls, and expert advice.

🚧Unpriced Items: Clarification is Key*

⏺When evaluating tenders, it's essential to address unpriced items. Bidders must clearly indicate whether costs are included in other items or omitted altogether. Leaving blank spaces is not advisable, as it may lead to confusion and disputes. Ensure that bidders provide explicit clarification on unpriced items to avoid potential issues.

🚧Post-Tender Clarifications: Verify and Confirm

⏺Post-tender clarifications are crucial in ensuring the accuracy of bids. Verify genuine errors, confirm with bidders, and revise offers accordingly. This proactive approach prevents misunderstandings, guarantees transparency, and maintains the integrity of the tender process.

🚧Qualifications and Deviations: A Balanced Approach

⏺When dealing with qualifications and deviations, refer to the Instruction to Tender (ITT). If the ITT allows qualifications, circulate them among bidders and obtain prices. This balanced approach ensures that all bidders have an equal opportunity to respond, promoting fairness and competition.

🚧Evaluating the Lowest Tender: A Cautionary Approach*

⏺When faced with an unusually low tender, exercise caution. Verify that there are no arithmetical errors, and consider the bidder's reputation, resources, and financial position. A thorough evaluation will help determine whether the low tender is genuinely viable or a potential risk.

🚧Managing High Offers: A Strategic Response

⏺If all tenders received are significantly higher than the pre-tender estimate, reassess your estimation process. Consider value engineering, explore provisional sum sections, and engage with bidders to negotiate prices. A strategic response will help you navigate this challenging situation.

📜Best Practices for Effective Tender Management

⏺1. *Clear Communication*: Ensure proper communication among disciplines and with tenderers to avoid ambiguities.
⏺2. *Risk Management*: Adopt suitable contract procurement methods, use standard forms of contracts, and balance risks among parties.
⏺3. *Cash Flow Management*: Consider advance payments and material payments to support tenderers with weak cash flow statements.
⏺4. *Evaluation Criteria*: Establish clear evaluation criteria, considering factors beyond just the lowest price.
⏺5. *Documentation*: Maintain detailed records of the tendering process, including communications, clarifications, and evaluations.

📍Conclusion

⏺Effective tender management is crucial for ensuring successful project outcomes. By following best practices, avoiding common pitfalls, and adopting a comprehensive approach, organisations can:

- Minimise risks and disputes
- Maximise value for money
- Foster fair competition and transparency
- Build strong relationships with contractors and stakeholders

⚡️Remember, tender management is a complex process that requires careful planning, precise execution, and meticulous evaluation. By embracing these principles, you'll be well on your way to achieving successful project outcomes.

@etconp

👉የግንባታ ፍቃድ እና የግንባታ ፕላን

📜በኢትዮጵያ የሕንጻ እዋጅ ቁጥር 624/20001 እና በሚኒስቴሮች ምክር ቤት ደንብ ቁጥር 243/2003 (አንቀጽ 2(8)) መሰረት፦

⏺የግንባታ ፍቃድ ማለት አንድ የሕንጻ ግንባታ ለማካሄድ ለሚፈልግ አካል ሕንጻውን ለመገንባት የሚያስችሉት ዝርዝር መስፈርቶች እንደተሟሉ በከተማው (ሕንጻ) ሹም ተረጋግጦ ግንባታ እንዲካሄድ ፍቃድ መስጠቱን የሚገልጽ ማስረጃ ማለት ነው።

⏺ፕላን ማለት ደግሞ በአዋጁ አንቀጽ 2(15) ሥር እንደተጠቀሰው የአንድ ሕንጻ መጠን፣ ቅርጽ፣ ስፋት እና አይነት የሚያሳይ ሆኖ ሕንጻው የሚሰራበትን ቁሳቁስ /ግብአት/ እና የአገነባብ ዘዴን የሚያሳይ ንድፍ ወይም ሞዴል ሲሆን የአርክቴክቸራል፣ ስትራክቸራል፣ ሳኒተሪ፣ ኤሌክትሪካል፣ መካኒካል፣ የእሳት መከላከል እና ሌሎች አስፈላጊ ሥራዎችን የሚያሳይ ንድፍ የሚያካትት ማለት ነው።

@etconp

👉 INTERCON Construction Chemicals 

● Concrete Admixtures
● Bonding Agents
● Waterproofings
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● 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: Signal, around signal mall

ታምራት  ፕሌት እና ጄቦልት አቅራቢ

📌ፕሌትና ጄቦልት በፈለጉት አይነት የተዘጋጀ አለን

♧ ሁሉን በአንድ ቦታ ለሁሉም ቅርብ

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👉Types of Claims in Contract Law

💫In contract law, claims arise when one party fails to fulfill their obligations, causing losses or damages to the other party. There are three primary types of claims:
*Contractual Claims*
*General Claims/Legal Claims* and *Ex-Gratia Claims*.

🚧1. Contractual Claim*

A contractual claim occurs when a party breaches a contractual obligation, and the other party seeks compensation for losses and damages. To pursue a contractual claim, parties must follow the contractual procedures outlined in the agreement, such as:

- *Issuing notices*: Providing written notice to the breaching party within a specified timeframe, as stated in the contract.
- *Impact mitigation measures*: Taking steps to minimize the impact of the breach, such as finding alternative suppliers or contractors.
- *Maintaining contemporary records*: Keeping accurate and up-to-date records of the breach, including correspondence, meetings, and agreements.

For example, if a contractor fails to complete a project on time, the employer may claim damages for the delay, as specified in the contract.

🚧2. General Claim/Legal Claim*

A general claim, also known as a legal claim, is pursued under the country's general law when contractual remedies are insufficient or unavailable. This type of claim is decided based on the country's legal framework, rather than the contractual provisions.

For instance:

- *Seeking compensation for delay damages outside of contractual provisions*: If a contract does not include a delay damage clause, the employer may still claim compensation for damages under the country's general law.

🚧3. Ex-Gratia Claim*

An ex-gratia claim is a relief granted by the employer on a quantum meruit basis (i.e., as much as deserved). This type of claim is considered when:

- *No contractual or legal entitlement*: The contractor has no contractual or legal basis for claiming relief.
- *Employer's discretion*: The employer chooses to provide relief to the contractor as a gesture of goodwill or to maintain a positive working relationship.

For example:

- A contractor makes a mistake or error that results in additional costs or expenses.
- Despite being responsible for the mistake, the contractor requests relief from the employer.
- The employer, at their discretion, chooses to provide an ex-gratia payment to the contractor, despite having no contractual obligation to do so.

@etconp

👉ለኢትዮጵያውያን አገልግሎት ሰጪዎች ማለትም ለአማካሪዎች እና ለሥራ ተቋራጮች በሀገር ውስጥ ለሚከናወኑ ግንባታዎች እና የማማከር አገልግሎት በአለም አቀፍ ግልጽ ጨረታ ላይ ሲሳተፉ የሚሰጥ ልዩ ጥቅማ ጥቅሞች ምን ምን ናቸው?

ለኢትዮጵያውያን አገልግሎት ሰጪዎች ነው የተፈቀደው ሲባል የኢትዮጵያ ዜግነት ያላቸው ወይም ትውልደ ኢትዮጵያዊ የውጭ አገር ዜጋ ከሆኑ ብቻ ነው::

ይህም ማለት ድርጅቱ በኢትዮጵያ ሕግ መሠረት የተቋቋመ እና ዋ/መ/ቤቱ በኢትዮጵያ ውስጥ የሚገኝ ከሆነ፣ ከድርጅቱ አክሲዮን ወይም የካፒታል ድርሻ ከ50% በላይ በኢትዮጵያውያን የተያዘ ከሆነ፣ ከድርጅቱ የዳይሬክተሮች ቦርድ አባላት መካከል ከ50% በላይ ኢትዮጵያውያን ከሆኑ እና ከድርጅቱ ቁልፍ ሠራተኞች መካከል ቢያንስ 30% ኢትዮጵያውያን ከሆኑ ብቻ ነው፡፡

ከዚህ በማስቀጠል በፌዴራል መንግስት የግዥ አፈፃፀም መመሪያ ምዕራፍ 3 ክፍል 3 አንቀጽ 28 የመንግሥት መ/ቤቶች ለኢትዮጵያውያን የምክር አገልግሎት ሰጪዎች እና ሥራ ተቋራጮች በአዋጅ ቁጥር 1333/2024 አንቀጽ 21(1)(ለ) በተቀመጠው መሰረት ልዩ አስተያየት መስጠት አለባቸው ይላል፡፡

ይህም ሲባል የሚደረገው ልዩ አስተያየት በዋጋ ላይ በሚደረግ ውድድር ወቅት በሚከተለው መሠረት ተፈፃሚ መደረግ አለበት፡፡ ለግንባታ ሥራ እና ለምክር አገልግሎት ግዥዎች በሚወዳደሩበት ወቅት 7.5% ከአጠቃላይ የጨረታ ውጤቱ ተደማሪ ይኖራቸዋል ማለት ነው፡፡

ከላይ ከተገለጹት በተጨማሪ የአገር ውስጥ የሥራ ተቋራጭች የሚወዳደሩባቸው ሥራዎች ካሸነፉ ከሥራው ጠቅላላ ዋጋ ከ20% የማያንስ ዋጋ ያለውን ሥራ በንዑስ ተቋራጭነት ለጥቃቅንና አነስተኛ ማኅበራት በመስጠት ለማሰራት ግዴታ የገቡ ከሆነ በጨረታው ለዋጋ ከተያዘው ነጥብ ተጨማሪ 2% ልዩ አስተያየት ይደረግላቸዋል፡፡

Via Getabun Abate

@etconp

👉DIFFERENCES BETWEEN ‎TRUE,  SHEAR,  AND COLLAPSE SLUMP CONE WITH THEIR APPLICATION⤵️
‎
💫‎TRUE SLUMP

    ‎🚧1. CHARACTERISTICS: Uniform decrease in height, maintaining the shape of the cone.
‎
    ‎🚧2. APPLICATION: Suitable for concrete with good workability and cohesion, often used in general construction projects.
‎
💫‎SHEAR SLUMP

    ‎🚧1. CHARACTERISTICS: Portion of the concrete shears off and slides down, indicating a lack of cohesion.
‎
    ‎🚧2. APPLICATION: May indicate issues with mix design or excessive water content; often seen in concrete with poor workability.
‎
💫‎COLLAPSE SLUMP

    ‎🚧1. CHARACTERISTICS: Concrete collapses completely, losing its shape.
‎
    🚧2. APPLICATION: Indicates high workability opr excessive water content; often used in applications requiring high flowability, such as self-compacting concrete.
‎
📜‎APPLICATIONS

     ‎📍1. CONSTRUCTION PROJECTS: Slump tests help ensure concrete meets workability requirements.
‎
      ‎📍2. MIX DESIGN: Slump tests aid in adjusting mix proportions to achieve desired workability.
‎
      ‎📍3. QUALITY CONTROL: Regular slump tests help monitor concrete quality and detect potential issues.
‎
⏺‎By understanding the differences between True slump, Shear slump, and Collapse slump tests, construction professionals can better assess concrete workability and make informed decisions.‎

@etconp

👉የገንዘብ ሚኒስቴር፥ የታክስ ኦዲት የሚከናወንበትን ሥርዓት እና የታክስ ስሌት ማስታወቂያ የሚወጣበትን አኳኋን ለመወሰን መመሪያ አውጥቷል።

መመሪያው ከትላንትና በስቲያ ጀምሮ ስራ ላይ ውሏል።

መመሪያው ስለ አጠቃላይ ኦዲት ምን ይላል ?

የታክስ ባለስልጣን አጠቃላይ ኦዲት የሚያከናውነው ፦

- በስጋት ግምገማ ወቅት ታክስ ከፋዩ በህግ በተደነገገው መሰረት የሂሳብ መዝገብ የመያዝ ገቢውን የማስታወቅ እና ታክስ የመክፈል ግዴታውን ያልተወጣ መሆኑ ሲታወቅ እና ይህም ሁኔታ የተለያዩ ታክሶችን የሚመለከት ሲሆን፤

- ሌላ አይነት ኦዲት በመደረግ ላይ ባለበት ጊዜ የተገኙ ታክስ ከፋዩ የፈጸማቸው ተገቢ ያልሆኑ አድራጎቶች ኦዲቱ በማይሸፍናቸው በሌሎች ታክሶች ላይ ጭምር ውጤት ያላቸው መሆኑ ሲታወቅ፤

- ታክስ ከፋዩ ኦዲት እንዲደርግ ሲጠየቅ እና በታክስ ባለስልጣኑ አጠቃላይ ኦዲት አስፈላጊ መሆኑ ሲታመንበት፤

- አግባብነት ባላቸው በሌሎች የታክስ ህጎች በተገለጹ ሌሎች ምክንያቶች፤

- ታክስ ከፋዩ በጭብጥ ኦዲት ተደርጎ አከራካሪ ከሆነ እና በቅሬታ ጽ/ቤት በኩል አጠቃላይ ኦዲት እንዲደረግ ትዕዛዝ ሲሰጥ፤ ... ነው ይላል።

የታክስ ባለስልጣን አጠቃላይ አዲት በሚያከናውንበት ጊዜ ፦
° ተገቢ ያልሆነ የሂሳብ ስሌት፣ ግድፈት፤
° ገቢን ማሳነስ፤
° ተገቢ ያልሆነ የታክስ አሰያየም
° በታክስ ማስታወቂያ ወይም ስሌት ረገድ የተፈጸመ ሌላ ማናቸውም ጥፋት ያለመኖሩን ለማረጋገጥ፤ ሁሉንም ወይም የተወሰኑትን የታክስ አይነቶች በሚመለከት ዝርዝር እና ጥልቀት ያለው ምርመራ ማድረግ እንዳለበት መመሪያው ላይ ሰፍሯል።

ይህ የማጣራት ተግባር አግባብነት እስካለው ድረስ የህግ ድንጋጌዎችን ተከትሎ መፈጸም እንዳለበትም ይገልጻል።

(ሙሉ መመሪያው ከላይ ተያይዟል)

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👉የቆዩ የከተማ ምስሎች

💫አዲስ አበባ ፒያሳ - 1958 ዓ.ም

⏺Returned Peace Corps Ethiopia III Volunteers/Darrel & Betty Hagburg Photograph:

በ Historic Ethiopia Through The Camera Lens 1860s-1990s

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