👉Hidden Enemies of Concrete: Chlorides & Sulphates

💫Concrete is considered one of the most durable construction materials—but in reality, it is highly vulnerable to certain hidden enemies present in water, soil, or even raw materials.

🚧Among them, Chlorides and Sulphates are the most dangerous.

✅ Positive Effects (in limited amount)

⭐️1. Chlorides:

⏺Small quantity of calcium chloride (CaCl₂) is sometimes added as an accelerator admixture to speed up early strength gain.
⏺Useful in cold weather concreting where rapid setting is needed.

⭐️2. Sulphates:

⏺In controlled form, gypsum (calcium sulphate) is added in cement during manufacturing to regulate setting time.
⏺Prevents flash setting and ensures workability.

❌ Negative Effects (when in excess)

🔰1. Chlorides:

⏺Promote steel reinforcement corrosion by breaking down passive film around rebars.
Lead to cracking, spalling, rust stains, and reduced load-bearing capacity.
⏺Main sources: saline water, marine environment, contaminated sand, de-icing salts.

🔰2. Sulphates:

⏺Cause sulphate attack—leading to expansion, cracking, and softening of concrete.
⏺Reaction with C3A (tricalcium aluminate in cement) produces expansive products (ettringite), damaging structure internally.
⏺Sources: groundwater rich in sulphates, soil, bricks, or certain aggregates.

📌 Key Takeaways for Quality Control:

🎲1. Always test mixing water, aggregates, and soil for chloride & sulphate content.
🎲2. Use sulphate resisting cement or blended cement in aggressive environments.
🎲3. Provide proper concrete cover & waterproofing to resist penetration.
🎲4. In marine/industrial structures, use corrosion inhibitors or protective coatings.

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👉ክራቸሪ/Base profile/Column starter/Column Kicker/

💫በግንባታ ሥራ ላይ፣ "ክራቸሪ" በዋናነት ለቀጣይ ቋሚ መዋቅር /Vertical structure/ ትክክለኛ ቀጤነት/አቀባዊ ሊኛ/vertical allignment/ እና የቅርጽ ስራን/Formwork/ለማረጋገጥ ከዋናው ቀጣይ ቋሚ መዋቅር ጋር ተመሳሳይ ስፋትና ርዝመት ያለው፣ ለዋናው መዋቅር መሪ/Refference/ ሆኖ የሚሰራ መነሻ ስራ ነው።

🚧ክራቸሪ በ 2 መንገድ ሊሰራ ይችላል::

❇️1ኛ. Column starter formwork
ለዋናው ቋሚ መዋቅር ተመሳሳይ ስፋትና ርዝመት ያለው፣ ለዋናው መዋቅር መሪ መነሻ ሆኖ የሚሰራ ፎርምወርክ ሲሆን

❇️2ኛ Column starter Concrete
ለዋናው ቋሚ መዋቅር ተመሳሳይ ስፋትና ርዝመት ያለው፣ ለዋናው መዋቅር መሪ መነሻ ሆኖ ከ5ሳሜ -10ሳሜ ጥልቀት ያለው ሆኖ የሚሰራ ኮንክሪት ነው።

✍ክራቸሪ ሌላ ምን ጥቅም ይሰጣል? ፃፉልን🙏

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👉TENDER ANNOUNCEMENT

⭐️LOT 46 Health campus remaining Works of Main get and fence construction

⏺Invitation Date Aug 28, 2025

📜Procurement Reference No DMU-NCB-W-0007-2018-BID-Open

💫Procuring Entity :Debremarkos University

📍Country: Ethiopia
⏺Town: DEBRE MARKOS
⏺Street: HADIS ALEMAYEHU
⏺Room Number:27/10

📞Telephone:+251921071526

📩Email:diresbinalfe@gmail.com
Po Box: 269

🚧Object of Procurement LOT 46 Health campus remaining Works of Main get and fence construction

⏺Lot Number 1

⚡️Clarification Request Deadline Sep 9, 2025, 5:00:00 PM

⏺Bid Submission Deadline Sep 22, 2025, 10:00:00 AM

⏺Bid Opening Schedule Sep 22, 2025, 10:30:00 AM

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👉JOB VACANCY

💫SITE SUPERVISOR

⏺Employment: Full-Time | Permanent
📍Place of Work: Around Gerji Mebrat Hail, Addis Ababa - Ethiopia
⚡️Deadline: September, 02/2025
 
🚧About the Role

⏺On behalf of our client, We are seeking a motivated and detail-oriented Site Supervisor to oversee day-to-day construction activities for our client's real estate and commercial building projects around Gerji Mebrat Hail, Addis Ababa.
⏺The ideal candidate will ensure smooth site operations, maintain quality standards, and manage timelines while coordinating effectively with workers, subcontractors, and management.

🏷Key Responsibilities

⏺Supervise and monitor construction site activities to ensure compliance with project plans and safety standards.
⏺Coordinate with contractors, subcontractors, and suppliers to ensure timely completion of work.
⏺Oversee material usage, site logistics, and daily labor activities.
⏺Conduct regular inspections to maintain quality control on construction progress.
⏺Prepare and submit daily/weekly site reports to project management.
⏺Ensure adherence to health, safety, and environmental (HSE) regulations on site.
⏺Act as the primary point of contact for site-related issues, resolving challenges efficiently.

❇️Qualifications & Skills

⏺Diploma or Bachelor’s degree in Construction Management, Civil Engineering, or related field.
⏺1–5 years proven experience as a Site Supervisor in real estate or commercial building projects.
⏺Strong knowledge of construction processes, materials, and quality standards.
⏺Excellent leadership, communication, and problem-solving skills.
⏺Proficiency in MS Office and construction management tools is an advantage.
⏺Strong organizational skills with attention to detail.

📩How to apply
Interested? Send your application to
recruitment1@geezjobs.com

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🏷ምዝገባ ጨርሰናል🙏

💫ሁለተኛ ዙር የ "Quantity Surveying" Full Course በ ኦንላይን ለመማር የተመዘገባቹ በ ሙሉ ቅዳሜ ማታ አንድ ሰዓት ክላስ ይጀመራል ተዘጋጁ❤

📩ለበለጠ መረጃ  @Philemona7 ወይም 0925446661 ይደውሉ

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አዲስ ዘመን ነሐሴ 22 ቀን 2017 ዓ. ም ዕትም ላይ የተወሰደ

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👉ጨረታ

⏺Building consultancy Service (የህንፃ ግንባታ ስራ ማማከር አገልግሎት) | Ethiopian Intellectual Property Authority

⏺Invitation Date  Aug 28, 2025

📜Procurement Reference No  EIPA-NCB-C-0004-2018-BID-Open

🚧Procurement Category :Consultancy Services
⏺Market Type:National
⏺Procurement Method:Open

📜Procurement Classification 

❇️Code Title 72110000  የመኖሪያ ሕንፃ ግንባታ አገልግሎቶች

⏺Procuring Entity Ethiopian Intellectual Property Authority,

📍Address
⏺Country: Ethiopia
⏺Town: Addis Ababa
⏺Street: kazanchis
⏺Room Number:2
📞Telephone: +251115500272
🎲Email: info@eipo.gov.et
📩Po Box: 25322/1000

Lot Information

⏺Object of Procurement  Building consultancy Service (የህንፃ ግንባታ ስራ ማማከር አገልግሎት)
Description  Building consultancy Service ** (የህንፃ ግንባታ ስራ ማማከር አገልግሎት)

- Lot Number  1
Clarification Request Deadline  Sep 7, 2025, 5:00:00 PM
Pre-Bid Conference Schedule  Not Applicable
Site Visit Schedule  Not Applicable
Bid Submission Deadline  Sep 12, 2025, 10:00:00 AM
Bid Opening Schedule  Sep 12, 2025, 10:30:00 AM
Bid Security Amount  50,000 ETB
Bid Security Form For SME  Letter from Small and Micro Enterprise, Bank Guarantee,
Bid Security Form For Foreign Bidders  Bank Guarantee,
Bid Security Form For Local Bidders  Bank Guarantee,
Notice

📜Terms and Conditions

⏺ጨረታውን በከፊልም ሆነ ሙሉ ለሙሉ የመሰረዝ መብቱ በህግ የተጠበቀ ነው

📍Application: Online on EGP

@etconp

👉የኢትዮጵያ ሲቪል መሐንዲሶች ማህበር እና ላሊበላ የጥናት ዲዛይንና ቁጥጥር ስራዎች ኃ/የተ/የግ/ማህበር 5ተኛውን የምህንድስና ጉባኤ በባህርዳር ከተማ ዛሬ ቅዳሜ ነሐሴ 24/ 2017 ያዘጋጃሉ።

💫በዚህ ጉባኤ መሐንዲሶች, በዘርፉ ልምድ እና እውቀት ያካበቱ ባለሙያዎች እና ባለድርሻ አካላት የሚሳተፉበት ይሆናል።

🚧The Ethiopian Association of Civil Engineers (EACE), and Lalibela Study Design & Supervision Works PLC, will host the 5th EACE Engineering

📜Conference under the theme: Transforming Construction: Innovation, Safety, and Sustainability

📍Location: Bahirdar, Ethiopia
🏷Date: August 30, 2025

⏺This premier event will bring together engineers, industry experts, and innovators to explore forward-thinking solutions that shape a safer, more sustainable construction industry.

@etconp

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