👉𝑪𝒐𝒔𝒕 𝑬𝒔𝒕𝒊𝒎𝒂𝒕𝒊𝒐𝒏 𝑻𝒆𝒄𝒉𝒏𝒊𝒒𝒖𝒆𝒔 𝒊𝒏 𝑪𝒐𝒏𝒔𝒕𝒓𝒖𝒄𝒕𝒊𝒐𝒏 𝑷𝒓𝒐𝒋𝒆𝒄𝒕𝒔

》Construction Cost Estimate

Predictive process involve application of techniques that convert quantified technical project info into financial resource info by quantifying required resources cost to fulfill project scope
Applied during each phase of project life cycle as project scope is defined, modified & refined

》Major advantages of making solid construction cost estimate:

-Improve Plan
-Save Money
-Allow to Make Better Bid Comparisons
-Reduce Risk
-Cut Down on Change Orders

》Cost Included in Construction Cost Estimate

-Contingency & Variance
-Equipment
-Indirect Cost
-Labor
-Material
-Professional Fee
-Quality

》Estimator Cost Information source

-Historical Data
-Cost Research
-Expert Judgment

》Major Cost Estimation Techniques

-Analogous estimate
-Bottom-up estimate
-Parametric estimate
-Cost of Quality
-Delphi cost estimate
-Empirical Costing Method
-Expert Judgment
-Reserve Analysis
-Resource costing
-3-Point Estimate
-U.S. Government Accountability Office (GAO) 12-step process
-Cost Estimating Software(e.g. Monte Carlo method)
-Vendor Bid Snalysis

》What Makes a Good Cost Estimate?

-Accuracy
-Confidence Level
-Credibility
-Documentation
-Precision
-Reliability
-Risk detailing
-Uniformity
-Validity
-Verification

》Inaccurate Project Cost Estimate Causes (Most Likely)

-Lack of experience with similar projects
-Length of planning horizon & project
-Human resources
-Not fully understand work involved to complete work packages
-Expect resources to work at maximum productivity
-Divide tasks between multiple resources
-Fail to identify risk & to prepare adequate contingency plan & reserve
-Not updating cost estimate after project scope changes
-Creating hasty, inaccurate estimates because of stakeholder pressure
-Stat estimates as fixed sum, rather than ranges
-Make project fit fixed budget amount

》Construction Cost Estimate by Level of Accuracy

American Society of Professional Estimators (ASPE) classify estimates according to 5-level system.

The least accurate & reliable label is Level 1 & most accurate & reliable is Level 5.

Confusingly, some authorities such as AACE & U.S. DOE reverse numbering, designating Level 1 as most precise estimate

-Level 1:Order-of-Magnitude Estimate
(Project definition at 0-2% & accuracy of estimate is within a margin of 20-30%)

-Level 2:Construction Feasibility Estimate
(Definition range 5-20% & accuracy range 10-25%)

-Level 3:Preliminary Construction Estimate
(Project definition range 10-40% & accuracy range 10-15%)

-Level 4:Substantive Construction Estimate
(Project is > 90% defined & accuracy 5-10%)

-Level 5:Definitive Construction Estimate
(maximum accuracy (0-2% variance & virtually 100% project definition)

》Construction Estimate Classification by Accuracy & Phase

-Design Estimate
-Bid Estimate
-Control estimate
-Performance vs. Forecast Estimate
-Current Working Estimate

@etconp

👉THE 3-4-5 METHOD

🚧This is an essential technique in the construction and civil engineering fields to accurately trace right angles on construction sites.

💫Based on the Pythagorean theorem, it guarantees the orthogonality of structures, ensuring their stability and proper alignment.

⭐️Application of the 3-4-5 method:

1. Measurement: Starting from an origin point, measure 3 units along a reference line and mark this point.

2. Second measurement: From the origin point, measure 4 units perpendicularly to the first line and mark this point.

3. Verification: Measure the distance between the two marked points; it should be 5 units. If this is the case, the angle formed is a right angle.

❇️This method is particularly useful for laying foundations, aligning walls, and verifying the perpendicularity of structural elements.

⏺It is simple to implement and only requires basic tools such as a tape measure.

⏺For a visual demonstration of this technique, you can refer to the following tutorial:

▶️3-4-5 method for drawing a perpendicular in construction

📍By adopting the 3-4-5 method, construction and public works professionals can ensure the precision and quality of their projects, thus contributing to the durability and safety of infrastructures.

@etconp

👉Lets See those Points

🔹Payment Process

▪️Interim Payments: Made at specified intervals (e.g., monthly) based on work completed.
▪️Final Payment: Made after completion, testing, and acceptance of works.
▪️Retention Money: A percentage withheld from interim payments, released upon completion.

🔹Payment Certificates

▪️Engineer's Certificate: Confirms work completion and authorizes payment.
▪️Payment Certificate: Issued by Employer/Engineer, detailing payment amounts.

🔹Payment Timeline

▪️Payment Due Date: 42 days after payment certificate issuance (FIDIC Red Book).
▪️Payment Period: Varies depending on contract terms.

🔹Payment Terms

▪️Lump Sum: Single payment for entire project.
▪️Measurement-Based: Payments based on measured work.
▪️Time-Based: Payments based on time spent.

🔹Payment Security

▪️Advance Payment Guarantee: Secures advance payments.
▪️Performance Guarantee: Ensures project completion.
▪️Payment Guarantee: Ensures payment to subcontractors.

🔹Dispute Resolution

▪️Dispute Adjudication Board (DAB): Resolves disputes.
▪️Arbitration: Final dispute resolution.

🔹FIDIC Contract Types

▪️Red Book: Construction contract.
▪️Yellow Book: Plant and design-build contract.
▪️Silver Book: EPC/Turnkey projects.
▪️Gold Book: Design-build-operate projects.

@etconp

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⭐️ቅዱስ ገብርኤል ቤተክርስትያን መቐለ

Via ሕሊና ታፈሰ

@etconp

👉Flexural strength and compressive strength Of Concrete

🏷They are two key mechanical properties of concrete, each describing how the material behaves under different types of stress.

⭐️1. Compressive Strength:

   - Definition: Compressive strength is the ability of concrete to withstand loads that reduce the size of the concrete, i.e., loads that push or compress the material.

   - Measurement: It is measured by applying a compressive load to a concrete cylinder or cube until it fails. The maximum load applied divided by the cross-sectional area of the specimen gives the compressive strength, typically expressed in megapascals (MPa) or pounds per square inch (psi).

   - Typical Values: Concrete generally has a high compressive strength, ranging from about 20 MPa (2900 psi) for residential construction to over 40 MPa (5800 psi) for commercial structures, and even higher for specialized applications.

⭐️2. Flexural Strength:

   - Definition: Flexural strength, also known as modulus of rupture, is the ability of concrete to resist deformation under bending. It reflects the tensile strength of concrete in bending.

   - Measurement: It is determined by loading a concrete beam until it fails in bending. The flexural strength is calculated based on the load at failure, the dimensions of the beam, and the span length. It is also expressed in MPa or psi.

   - Typical Values: Flexural strength is typically much lower than compressive strength, often about 10% to 20% of the compressive strength, depending on the mix design and the presence of reinforcing materials.

📜Key Differences:

- Type of Stress: Compressive strength involves compression (pushing forces), while flexural strength involves tension due to bending (pulling forces).

- Magnitude: Concrete's compressive strength is significantly higher than its flexural strength.

- Application: Compressive strength is crucial for columns, foundations, and other elements primarily subjected to compressive loads. Flexural strength is important for beams, slabs, and other elements subjected to bending moments.

🔰Understanding both properties is essential for designing concrete structures that are safe and durable under the expected loading conditions.

@etconp

👉TYPES OF SOIL

💫Soil is a crucial component in construction, road building, and other engineering projects.

🚧Different types of soil have varying properties that make them suitable or unsuitable for specific applications.

⏺Below is a description of the types of soil commonly used in construction, road building, and other structures:

⭐️1. Gravel

- Description: Gravel consists of coarse particles, typically larger than 2 mm in diameter. It is a mixture of small rocks and pebbles.

- Properties:
- High load-bearing capacity.
- Excellent drainage properties.
- Resistant to compaction.

- Uses:
- Base material for roads and foundations.
- Used in concrete production.
- Ideal for drainage systems.

⭐️2. Sand

- Description: Sand is composed of fine granular particles, ranging from 0.075 mm to 4.75 mm in diameter.

- Properties:
- Good drainage and low cohesion.
- Easy to compact.
- Poor plasticity.

- Uses:
- Sub-base material for roads and pavements.
- Used in mortar and concrete mixtures.
- Suitable for backfilling trenches.

⭐️3. Silt

- Description: Silt consists of fine particles, smaller than sand but larger than clay (0.002 mm to 0.075 mm).

- Properties:
- Smooth texture.
- Moderate drainage and fertility.
- Low strength when wet.

- Uses:
- Not ideal for construction due to low strength.
- Can be stabilized with additives for use in road subgrades.

⭐️4. Clay

- Description: Clay is made up of extremely fine particles (less than 0.002 mm in diameter) and has high plasticity.

- Properties:
- High cohesion and plasticity.
- Expands when wet and shrinks when dry.
- Poor drainage.

- Uses:
- Used in making bricks, tiles, and ceramics.
- Stabilized clay can be used in road construction.
- Not suitable for foundations due to swelling and shrinkage.

⭐️5. Loam

- Description: Loam is a mixture of sand, silt, and clay in roughly equal proportions.
- Properties:
- Balanced drainage and fertility.
- Moderate strength and compaction.

- Uses:
- Used in landscaping and agriculture.
- Not typically used in heavy construction but can be stabilized for light structures.

⭐️ 6. Peat

- Description: Peat is an organic soil composed of decomposed plant material.

- Properties:
- High organic content.
- Poor load-bearing capacity.
- High compressibility.

- Uses:
- Not suitable for construction or road building.
- Often removed and replaced with stronger soils in construction projects.

⭐️7. Rock (Bedrock)

- Description: Rock refers to solid, unweathered geological formations.

- Properties:
- Extremely high strength and stability.
- Excellent load-bearing capacity.

- Uses:
- Foundation for large buildings and bridges.
- Used as aggregate in concrete and asphalt.

⭐️8. Laterite

- Description: Laterite is a reddish, iron-rich soil formed in tropical regions.

- Properties:
- Hardens when exposed to air.
- Moderate strength.

- Uses:
- Used in road construction in tropical regions.
- Can be cut into bricks for building.

⭐️9. Bentonite

- Description: Bentonite is a type of clay formed from volcanic ash.

- Properties:
- High swelling capacity when wet.
- Low permeability.

- Uses:
- Used as a sealing material in foundations and landfills.
- Used in drilling fluids for construction.

⭐️10. Fill Dirt

- Description: Fill dirt is a mixture of soil, sand, and rock used to fill depressions or raise ground levels.

- Properties:
- Low organic content.
- Compactable and stable.

- Uses:
- Used in landscaping and construction to create level surfaces.
- Not suitable for structural support.

@etconp 👇

🌟Key Considerations for Soil in Construction and Road Building**:

1. Load-Bearing Capacity: Soils like gravel and sand are preferred for their high strength.
2. Drainage: Well-draining soils (e.g., gravel, sand) are ideal for road construction.
3. Stability: Clay and silt may require stabilization to prevent swelling or shrinkage.
4. Compaction: Proper compaction is essential to ensure soil stability and prevent settlement.

📜By understanding the properties of different soils, engineers can select the appropriate type for construction, road building, and other projects.

@etconp

Intercon Construction Chemicals 
    
👉 Authorized agent of MC, SIMENTEK, Sika, Weber

● Concrete Admixtures
● Bonding Agents
● Waterproofings
● Concrete Repair, Grouting   
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● Wall Putty, Prime Coat, Rush Coat
● Quartz, Contextra
● Floor hardener, Epoxy              
● Geotextiles, Geo-membranes and other construction chemicals and materials

Tel: 0961955555 or 0944774267
Address: Signal, around signal mall

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-----------------------------------
Sułoszowa – the Polish village where 6,000 people share the same road

In the heart of Poland, a few kilometers from Krakow, there is a village that looks like it came out of a rural painting: Sułoszowa. Here, all of its approximately 6,000 inhabitants live along a single main road, a detail that makes this locality unique and fascinating. Seen from above, the village offers an extraordinary spectacle: a long, perfectly linear central artery, flanked by neatly arranged houses, like pearls strung on a single thread.

@etconp

👉What is the Earned Value Management in Construction Project Management ❓

🏷Earned Value Management (EVM) is a project management technique widely used in construction projects to measure and monitor project performance and progress. It integrates three critical components: scope, schedule, and cost, providing a comprehensive picture of how a project is performing compared to its baseline.

⭕️ Key Components of EVM

📖 Planned Value (PV): Also known as Budgeted Cost of Work Scheduled (BCWS). This represents the budgeted cost of the work planned to be completed at a specific point in time.

💵 Earned Value (EV): Also known as Budgeted Cost of Work Performed (BCWP). This represents the budgeted cost of the work that has actually been completed at a specific point in time.

🪬 Actual Cost (AC): Also known as Actual Cost of Work Performed (ACWP). This is the actual cost incurred for the work completed at a specific point in time.

⭕️ EVM Metrics
EVM generates key metrics to analyze project performance:

🔥 Schedule Variance (SV)
Formula: SV=EV−PV
Indicates whether the project is ahead of or behind schedule.
Positive SV: Ahead of schedule
Negative SV: Behind schedule

🔥 Cost Variance (CV)
Formula: CV=EV−AC
Indicates whether the project is under or over budget.
Positive CV: Under budget
Negative CV: Over budget

🔥 Schedule Performance Index (SPI)
Formula: SPI=EV/PV
Measures schedule efficiency (progress vs. plan).
SPI > 1: Ahead of schedule
SPI < 1: Behind schedule

🔥 Cost Performance Index (CPI)
Formula: CPI=EV/AC
Measures cost efficiency (value earned for money spent).
CPI > 1: Under budget
CPI < 1: Over budget

⭕️ Benefits of EVM in Construction

1. Proactive Decision-Making: Identifies variances early, allowing corrective actions to keep the project on track.
2. Integrated Performance Tracking: Combines cost, schedule, and scope into a single framework.
3. Forecasting Capability: Predicts future project performance and costs based on current trends.
4. Improved Communication: Provides a clear, quantitative view of project progress for stakeholders.

@etconp