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๐Ÿ‘‰Key Performance indicators for construction management

๐Ÿ’ซKey Performance Indicators (KPIs) that support better schedule tracking, cost management, resource utilization, and quality control.

๐ŸŒŸThe following pictures illustrate 10 basic KPIs with their basic explanations.

Via Yonatan Tadesse PMPยฎ

@etconp
โค14๐Ÿ‘9๐Ÿ‘2
๐Ÿ‘‰แ‹จแŠ แˆญแˆ›แ‰ณ แ‰ฅแˆจแ‰ต แ‰ แˆœแ‰ตแˆญ แˆแŠ• แ‹ซแˆ…แˆ แ‹ญแˆ˜แ‹แŠ“แˆ?

๐ŸšงแˆˆแŠฎแŠ•แˆตแ‰ตแˆซแŠญแˆฝแŠ• แŒแ‰ฅแ‹“แ‰ต แ‹จแˆแŠ•แŒ แ‰€แˆ›แ‰ธแ‹ แ‹จแŠ แˆญแˆ›แ‰ณ แ‰ฅแˆจแ‰ต แ‰ แ‰…แˆญแƒแ‰ธแ‹ แ‰ แˆแˆˆแ‰ต แ‹ญแŠจแˆแˆ‹แˆ‰:-

๐Ÿท1. แˆแˆ™แŒฅ แ‰ฅแˆจแ‰ต (Mild Steel or plain rebar)

๐Ÿท2. แ‰ฃแˆˆ แŠญแˆญแŠญแˆญ/แŠ แˆญแˆ›แ‰ณ แ‰ฅแˆจแ‰ต(Deformed steel rebar)

๐Ÿ’ซแ‰ แŒฅแŠ•แŠซแˆฌ แ‹ฐแˆจแŒƒ แ‹ฐแŒแˆž แ‰ แˆตแ‹แ‰ต Grade 60 แŠฅแŠ“ Grade 40 แ‰ แˆ˜แ‰ฃแˆ แ‹ญแˆˆแ‹ซแˆ‰ แ‹ญแˆ…แˆ แ‹แŒฅแˆจแ‰ณแ‹Š แˆ€แ‹ญแˆ/tensile strength/แ‰ แˆ˜แ‰‹แ‰‹แˆ แŠ แ‰…แˆ›แ‰ธแ‹ แАแ‹แข

โญ๏ธGrade 40=275.79MPa yield strength แˆฒแŠ–แˆจแ‹

โญ๏ธGrade 60=413.68MPa yield strength แ‹ญแŠ–แˆจแ‹‹แˆ

โ‡๏ธแˆˆแˆ›แŠ•แŠ›แ‹แˆ แŠ แˆตแ‰ฐแ‹ซแ‹จแ‰ตแ‹Ž  แŠฅแŠ“ แˆ€แˆณแ‰ฅแ‹Ž แ‹ญแŒปแ‰แˆแŠ•!

๐Ÿ“œแˆˆ แˆตแˆซ แŠฅแŠ“ แŒจแˆจแ‰ณแ‹Žแ‰ฝ แˆแŠ•แˆˆแ‰…แ‰ แ‰ต แ‰ปแŠ“แˆ แˆˆแˆ˜แ‰€แˆ‹แ‰€แˆ๐Ÿ‘‰ @ETCONpWORK

๐Ÿ“ฉแˆŠแŒฝแ‰แˆแŠ• แŠซแˆฐแ‰ก @ETCONpBOT

๐Ÿ’ซแ‰ฒแŠญแ‰ถแŠญ:๐Ÿ‘‡

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๐Ÿ‘25โค2
๐Ÿ‘‰แ‰ณแŠ•แ‹›แŠ’แ‹ซ แ‹จแˆแˆตแˆซแ‰… แŠ แแˆชแŠซแŠ• แˆจแŒ…แˆ™แŠ• แ‹ตแˆแ‹ตแ‹ญ แ‹ญแ‹ แŠ แ‹ฐแˆจแŒˆแ‰ฝ

๐Ÿทแ‰ณแŠ•แ‹›แŠ’แ‹ซ แ‰ แ‰ชแŠญแ‰ถแˆชแ‹ซ แˆƒแ‹ญแ‰… แˆ‹แ‹ญ 3.2 แŠชแˆŽ แˆœแ‰ตแˆญ แˆญแ‹แˆ˜แ‰ต แ‹ซแˆˆแ‹ แ‹ตแˆแ‹ตแ‹ญ แ‰ 300 แˆšแˆŠแ‹จแŠ• แ‹ถแˆ‹แˆญ แ‹จแˆแŒ€แ‰ แ‰ตแŠ• แŒแŠ•แ‰ฃแ‰ณ แŠ แŒ แŠ“แ‰ƒแˆˆแ‰ฝแข

๐Ÿšงแ‹ญแˆ… แ‹ตแˆแ‹ตแ‹ญ แ‰ แ‰ณแŠ•แ‹›แŠ’แ‹ซ ๐Ÿ‡บ๐Ÿ‡ฌแŠกแŒ‹แŠ•แ‹ณแฃ ๐Ÿ‡ท๐Ÿ‡ผแˆฉแ‹‹แŠ•แ‹ณแŠ“แฃแ‰ฅแˆฉแŠ•แ‹ฒแŠ• แŒจแˆแˆฎ แ‰ แˆŒแˆŽแ‰ฝ แˆ€แŒˆแˆซแ‰ต แˆ˜แŠซแŠจแˆ แ‹ซแˆˆแ‹แŠ• แ‹จแŠ•แŒแ‹ต แˆแ‹แ‹แŒฅ แˆˆแˆ›แˆณแˆˆแŒฅ แ‰ณแˆตแ‰ฆ แ‹จแ‰ฐแŒˆแАแ‰ฃ แ‹ตแˆแ‹ตแ‹ญ แАแ‹แข

๐Ÿ’ซแ‹จแˆแˆตแˆซแ‰… แŠ แแˆชแŠซ แˆจแŒ…แˆ™ แ‹ตแˆแ‹ตแ‹ญแฃ 3.2 แŠชแˆŽ แˆœแ‰ตแˆญ แ‹จแˆšแˆธแแŠ• แˆฒแˆ†แŠ• แ‰ แˆ˜แŒ€แˆ˜แˆชแ‹ซ แ‹จแŠชแŒŽแŠ•แŒŽ-แ‰กแˆฒแˆฒ แ‹ตแˆแ‹ตแ‹ญ แ‰ แˆ˜แ‰ฃแˆ แ‹ญแ‰ณแ‹ˆแ‰… แ‹จแАแ‰ แˆจแ‹ แˆˆแ‰ณแŠ•แ‹›แŠ’แ‹ซ แ‹จแ‰€แ‹ตแˆž แ•แˆฌแ‹แ‹ณแŠ•แ‰ต แŒ†แŠ• แ–แˆแ‰ค แŒ†แˆดแ แˆ›แŒ‰แ‰แˆŠ แŠญแ‰ฅแˆญ แˆฒแˆ แŒ„แ’ แˆ›แŒ‰แ‰แˆŠ แ‹ตแˆแ‹ตแ‹ญ แ‰ฐแ‰ฃแˆˆแข

โญ๏ธแ‹ตแˆแ‹ตแ‹ฉ แ‰ แŠฌแŠ•แ‹ซ แ‹ตแŠ•แ‰ แˆญ แˆ‹แ‹ญ แ‹จแˆšแŒˆแŠ˜แ‹แŠ• แ‰ณแˆชแˆšแŠ• แŠจแŠกแŒ‹แŠ•แ‹ณ แ‹ตแŠ•แ‰ แˆญ แ‰กแŠฎแ‰ฃ แŒ‹แˆญ แ‹จแˆšแ‹ซแŒˆแŠ“แŠ˜แ‹ แ‹จแ‰ณแŠ•แ‹›แŠ’แ‹ซ Trunk road T4 แŠ แŠซแˆ แˆฒแˆ†แŠ• แ‰ แŠ แŠซแ‰ฃแ‰ขแ‹ แ‹ซแˆˆแ‹แŠ• แ‹จแŒ‰แ‹ž แŒŠแ‹œ แŠจ2 แˆฐแŠ แ‰ต แ‹ˆแ‹ฐ 4 แ‹ฐแ‰‚แ‰ƒ แ‹ซแˆณแŒฅแˆจแ‹‹แˆแข

๐ŸŒŸแ‰ แ‰ปแ‹ญแŠ“ แ‹จแ‰ฐแŒˆแАแ‰ฃแ‹ แˆœแŒ‹ แˆ˜แˆ แˆจแ‰ฐ แˆแˆ›แ‰ต แ‰ แ‰ปแ‹ญแŠ“ แˆฒแ‰ชแˆ แŠขแŠ•แŒ‚แАแˆชแŠ•แŒ แŠฎแŠ•แˆตแ‰ตแˆซแŠญแˆฝแŠ• แŒแˆฉแ• (แˆฒแˆฒแˆฒแŒ‚) แŠฅแŠ“ แ‰ แ‰ปแ‹ญแŠ“ แˆแ‹ตแˆญ แ‰ฃแ‰กแˆญ แ‹จแ‰ฐแˆตแ‰ฐแŠ“แŒˆแ‹ฐ แˆฒแˆ†แŠ• แˆ™แˆ‰ แ‰ แˆ™แˆ‰ แ‹จแ‰ณแŠ•แ‹›แŠ’แ‹ซ แˆ˜แŠ•แŒแˆตแ‰ต แ‰ แˆซแˆฑ แŒˆแ‰ข แ‰ฐแˆธแแŠ—แˆแข

๐Ÿ”ฐแŠจแŠ แˆซแ‰ต แŠ แˆ˜แ‰ณแ‰ต แ‰ แˆ‹แ‹ญ แŠจแ‰ฐแˆฐแˆซ แ‰ แŠ‹แˆ‹ แ‰ แŠ แแˆชแŠซ แˆจแŒ…แˆ™ แ‹แ‰…แ‰ฐแŠ›แ‹ แ‹จแ“แ‹ญแˆŽแŠ• แŒˆแˆ˜แ‹ต ( low-pylon cable-stayed bridge) แ‹ซแˆˆแ‹ แ‹ตแˆแ‹ตแ‹ญ แŠ แˆแŠ• แˆ™แˆ‰ แ‰ แˆ™แˆ‰ แ‰ฐแŒˆแŠ“แŠแ‰ทแˆแข

๐Ÿ”ฐแ‰ แŠ แแˆชแŠซ แ‰ตแˆแ‰ แˆ€แ‹ญแ‰… แ‰ แˆ†แАแ‹ แ‰ แ‰ชแŠญแ‰ถแˆชแ‹ซ แˆ€แ‹ญแ‰… แ‹ฐแ‰กแ‰ฃแ‹Š แ‹จแ‰ฃแˆ…แˆญ แ‹ณแˆญแ‰ป แˆ‹แ‹ญ แ‹จแˆšแŒˆแŠ˜แ‹ แ‹ตแˆแ‹ตแ‹ฉ 4.66 แŠชแˆŽ แˆœแ‰ตแˆญ แˆญแ‹แˆ˜แ‰ต แ‹ซแˆˆแ‹ แˆฒแˆ†แŠ• แ‰ แˆฐแŠ แ‰ต แˆˆ120 แŠชแˆŽ แˆœแ‰ตแˆญ แแŒฅแАแ‰ต แ‹จแ‰ฐแАแ‹ฐแˆ แ‰ฃแˆˆแˆแˆˆแ‰ต แˆฐแˆจแŒˆแˆ‹ แ‹ซแˆˆแ‹ แАแ‹แข

๐Ÿ”ฐแ‹‹แŠ“แ‹ แ‹ตแˆแ‹ตแ‹ญ, 520 แˆœแ‰ตแˆญ, แ‰ฃแˆˆ แˆถแˆตแ‰ต-แ“แ‹ญแˆŽแŠ•, แ‰ฃแˆˆ แˆแˆˆแ‰ต แŒˆแˆ˜แ‹ต แŠ แ‹แˆฎแ•แˆ‹แŠ• แ‹แ‰…แ‰ฐแŠ›-แ“แ‹ญแˆŽแŠ• แ‹จแŠฌแ‰ฅแˆ แŒˆแˆ˜แ‹ต แ‹ซแˆˆแ‹ แˆ˜แ‹‹แ‰…แˆญ, 123 แŠญแแˆŽแ‰ฝแŠ• แ‹ซแ‰€แˆ แАแ‹แข

โ‡๏ธแ‹‹แŠ“ แŒแ‰ก แ‰ แˆแ‹‹แŠ•แ‹› แŠฅแŠ“ แ‰ แˆˆแˆŽแ‰ฝ แŠญแˆแˆŽแ‰ฝ แˆ˜แŠซแŠจแˆ แ‹ซแˆˆแ‹แŠ• แŒแŠ•แŠ™แАแ‰ต แˆ›แˆปแˆปแˆแฃแ‹จแŒ‰แ‹ž แŒŠแ‹œแŠ• แŠฅแŠ“ แ‹จแˆ˜แŒ“แŒ“แ‹ฃ แ‹ˆแŒชแ‹Žแ‰ฝแŠ• แˆ˜แ‰€แАแˆต แŠฅแŠ“ แ‹จแˆฐแ‹Žแ‰ฝ แŠฅแŠ“ แ‹จแˆธแ‰€แŒฆแ‰ฝ แŠฅแŠ•แ‰…แˆตแ‰ƒแˆดแŠ• แˆ›แˆปแˆปแˆ แАแ‹แข

โญ๏ธแ‹ตแˆแ‹ตแ‹ฉ แ‹จ MV 'Hapa Kazi Tu' แˆ˜แˆญแŠจแ‰ฅ แŠฅแŠ“ แ‹จแˆตแ‰ณแŠ•แ‹ณแˆญแ‹ต แˆ˜แˆˆแŠชแ‹ซ แ‰ฃแ‰กแˆญ (SGR) แ‰ แ‰ฐแˆˆแ‹ญแˆ แ‹จแˆแ‹‹แŠ•แ‹›-แŠขแˆณแŠซ แŠญแแˆแŠ• แŒจแˆแˆฎ แˆฐแŠ แ‹จแˆ˜แˆ แˆจแ‰ฐ แˆแˆ›แ‰ต แ‰ฐแАแˆณแˆฝแАแ‰ต แŠ แŠซแˆ แАแ‹แข

๐ŸŒŸแ‹ญแˆ… แ•แˆฎแŒ€แŠญแ‰ต แŠจ1,500 แ‰ แˆ‹แ‹ญ แˆˆแˆšแˆ†แŠ‘ แ‹œแŒŽแ‰ฝ แ‹จแˆตแˆซ แŠฅแ‹ตแˆ แ‹จแˆแŒ แˆจ แˆฒแˆ†แŠ• แˆˆแŠ แŠซแ‰ฃแ‰ขแ‹ แŠ แ‰…แˆ แŒแŠ•แ‰ฃแ‰ณ แŠฅแŠ“ แŠขแŠฎแŠ–แˆšแ‹ซแ‹Š แŠฅแ‹ตแŒˆแ‰ต แŠ แˆตแ‰ฐแ‹‹แŒฝแŠฆ แŠ แ‹ตแˆญแŒ“แˆแข

@etconp
๐Ÿ‘20โค3
๐Ÿ‘‰Patent Defects in Construction

๐Ÿ’ซPatent defects are defects that are completely visible to the naked eyeโ€”for example, faulty pipes, water stains on the walls, wall cracks, etc.

โญ๏ธA practical completion certificate is a contractual document that allows the client to take possession of and use a building.

๐ŸทAll the defects apparent before the practical completion of the project should be rectified before issuing the certificate of practical completion.

โ‡๏ธแˆˆแˆ›แŠ•แŠ›แ‹แˆ แŠ แˆตแ‰ฐแ‹ซแ‹จแ‰ตแ‹Ž  แŠฅแŠ“ แˆ€แˆณแ‰ฅแ‹Ž แ‹ญแŒปแ‰แˆแŠ•!

๐Ÿ“œแˆˆ แˆตแˆซ แŠฅแŠ“ แŒจแˆจแ‰ณแ‹Žแ‰ฝ แˆแŠ•แˆˆแ‰…แ‰ แ‰ต แ‰ปแŠ“แˆ แˆˆแˆ˜แ‰€แˆ‹แ‰€แˆ๐Ÿ‘‰ @ETCONpWORK

๐Ÿ“ฉแˆŠแŒฝแ‰แˆแŠ• แŠซแˆฐแ‰ก @ETCONpBOT

๐Ÿ’ซแ‰ฒแŠญแ‰ถแŠญ:๐Ÿ‘‡

www.tiktok.com/@etconp7

@etconp
๐Ÿ‘15โค3
Ethio Construction Engineering
๐Ÿ‘‰Patent Defects in Construction ๐Ÿ’ซPatent defects are defects that are completely visible to the naked eyeโ€”for example, faulty pipes, water stains on the walls, wall cracks, etc. โญ๏ธA practical completion certificate is a contractual document that allows theโ€ฆ
๐Ÿ‘‰Types of Defects In Building Construction

โญ๏ธ1. Cracks: Cracks can occur in walls, floors, and ceilings due to settling of a structure, poor workmanship, or environmental factors such as temperature changes.

โญ๏ธ2. Leaks: Leaks can occur in roofs, walls, windows, and pipes, leading to water infiltration and damage to the building structure.

โญ๏ธ3. Poor insulation: Poor insulation can lead to energy inefficiency, higher utility bills, and discomfort for occupants.

โญ๏ธ4. Uneven floors: Uneven or sloping floors can be caused by poor foundation construction, settling of the structure, or water damage.

โญ๏ธ5. Electrical problems: Electrical defects can include faulty wiring, incorrect installation of fixtures, and inadequate access to electrical panels.

โญ๏ธ6. Plumbing issues: Plumbing defects can include leaking pipes, poor water pressure, and inadequate drainage systems.

โญ๏ธ7. Mold and mildew: Mold and mildew growth can occur due to water infiltration, poor ventilation, and high humidity levels, leading to health hazards for occupants.

โญ๏ธ8. Structural issues: Structural defects can include inadequate reinforcement, foundation problems, and unstable walls or columns.

โญ๏ธ9. Poor finishing: Poor finishing can include uneven paint or flooring, poorly installed fixtures, and damaged surfaces, affecting the overall aesthetic appeal of the building.

โญ๏ธ10. Inadequate ventilation: Poor ventilation can lead to poor indoor air quality, discomfort for occupants, and potential health hazards.

@etconp
๐Ÿ‘9
๐Ÿ‘‰แŠฅแˆตแŠช แ‹ญแˆ„ แАแŒˆแˆญ แˆณแ‹ญแ‰ต/Site แˆ‹แ‹ญ แ‹จแŒˆแŒ แˆ›แ‰ฝแˆ?

๐Ÿšงแ‰ แˆ…แŠ•แƒแ‹ แˆ‹แ‹ญแˆต แˆแŠ• แ‰ฐแŒฝแŠฅแŠ– แ‹ญแŠ–แˆจแ‹‹แˆ? แˆˆแˆแŠ•แˆต bend แ‹ญแ‹ฐแˆจแŒ‹แˆ?

๐Ÿ“ฉแˆ€แˆณแ‰ฆแ‰ปแ‰น แŠจแ‰ณแ‰ฝ แ‰ฃแˆˆแ‹ แˆŠแŠ•แŠญ แ‹ซแŒ‹แˆฉแŠ• แ‹ˆแ‹ญ แŠฎแˆœแŠ•แ‰ต แˆ˜แˆตแŒซ แˆ‹แ‹ญ แƒแ‰๐Ÿ‘‡

https://t.me/COTMp

@etconp
๐Ÿ‘19
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๐Ÿ‘‰แ‹จแ‹แŒญ แŠ แŒˆแˆญ แˆˆแŠฎแŠ•แˆตแ‰ตแˆซแŠญแˆฝแŠ• แ‰ฃแˆˆแˆžแ‹ซแ‹Žแ‰ฝ

๐Ÿ’ซแ‰ แˆ€แŒˆแˆซแ‰ฝแŠ• แ‰ แŠฎแŠ•แˆตแ‰ตแˆซแŠญแˆฝแŠ• แ‹˜แˆญแ แˆˆแˆ˜แˆฐแˆ›แˆซแ‰ต แ‹จแˆšแ‹ซแˆตแ‰ฝแˆ‹แ‰ธแ‹แŠ• แแ‰ƒแ‹ต แŠฅแŠ•แ‹ฒแ‹ซแŒˆแŠ™ แ‹จแ‹ตแŒ‹แ แ‹ฐแ‰ฅแ‹ณแ‰ค แ‹จแˆšแ‹ซแŒˆแŠ™แ‰ แ‰ตแŠ• แˆแŠ”แ‰ณ แˆˆแˆ˜แ‹ˆแˆฐแŠ• แ‰ แ‹ˆแŒฃแ‹ แˆ˜แˆ˜แˆชแ‹ซ แ‰แŒฅแˆญ 29/2012 แ‹“.แˆ แˆ˜แˆฐแˆจแ‰ต แŠ แŒˆแˆแŒแˆŽแ‰ฑแŠ• แ‰ แŒแŠ•แ‰ฃแˆญ แˆฒแˆฐแŒฅ แ‰†แ‹ญแ‰ทแˆแกแก

๐Ÿšงแ‹จแ‹ตแŒ‹แ แ‹ฐแ‰ฅแ‹ณแ‰ค แŠ แˆฐแŒฃแŒฅ แŠ แŒˆแˆแŒแˆŽแ‰ต แ‰€แˆแŒฃแ‹แŠ“ แ‹จแ‰ฐแŒˆแˆแŒ‹แ‹ฉแŠ• แแˆ‹แŒŽแ‰ต แ‹จแˆšแ‹ซแˆจแŠซ แ‹ญแˆ†แŠ• แ‹˜แŠ•แ‹ต แ‰ แ‰ดแŠญแŠ–แˆŽแŒ‚ แŠฅแŠ•แ‹ฒแ‰ณแŒˆแ‹ แˆˆแˆ›แ‹ตแˆจแŒ แŠจแแ‰ฐแŠ› แŒฅแˆจแ‰ต แˆฒแ‹ฐแˆจแŒ แ‰†แ‹ญแ‰ทแˆ แกแก

๐Ÿทแ‰ แ‹šแˆ แˆ˜แˆฐแˆจแ‰ต แ‹จแŠ แŒˆแˆแŒแˆŽแ‰ต แŠ แˆฐแŒฃแŒกแŠ• แŠจแŒฅแ‰…แˆแ‰ต 1 แ‰€แŠ•2017แ‹“.แˆ แŒ€แˆแˆฎ แ‰ฃแˆ‰แŒ‰แ‹ณแ‹ฉแ‰ฝ แŠซแˆ‰แ‰ แ‰ต แ‰ฆแ‰ณ แˆ†แАแ‹ แ‰  online แŠ แŒˆแˆแŒแˆŽแ‰ต แ‹จแˆšแ‹ซแŒˆแŠ™แ‰ แ‰ต  แˆแŠ”แ‰ณ แˆตแˆˆแ‰ฐแˆ˜แ‰ปแ‰ธ แŠ แŒˆแˆแŒแˆŽแ‰ฑแŠ• แ‹จแˆแ‰ตแˆแˆแŒ‰ แ‰  www.Eservice.gov.et แˆ›แŒแŠแ‰ต แ‹จแˆแ‰ตแ‰ฝแˆ แˆ˜แˆ†แŠ‘แŠ• แŠฅแŠ•แŒˆแˆแƒแˆˆแŠ• แข
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แ‹จแŠจแ‰ฐแˆ›แŠ“ แˆ˜แˆ แˆจแ‰ฐ แˆแˆ›แ‰ต แˆšแŠ’แˆตแ‰ดแˆญ

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โ— Concrete Admixtures
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โ— Floor hardener, Epoxy              
โ— Geotextiles, Geo-membranes and other construction chemicals and materials

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แ‰ณแˆแˆซแ‰ต  แ•แˆŒแ‰ต แŠฅแŠ“ แŒ„แ‰ฆแˆแ‰ต แŠ แ‰…แˆซแ‰ข

๐Ÿ‘‰แˆแˆ‰แŠ• แ‰ แŠ แŠ•แ‹ต แ‰ฆแ‰ณ แ‹จแˆšแ‹ซแŒˆแŠ™แ‰ แ‰ต แŠฅแŠ“ แˆˆแˆแˆ‰แˆ แ‰…แˆญแ‰ฅ

๐Ÿ”ฐแˆแŠ• แ‹ญแˆแˆแŒ‹แˆ‰?

๐Ÿ“Œแ•แˆŒแ‰ตแŠ“ แŒ„แ‰ฆแˆแ‰ต แ‰ แˆแˆˆแŒ‰แ‰ต แŠ แ‹ญแАแ‰ต แ‹จแ‰ฐแ‹˜แŒ‹แŒ€ แŠ แˆˆแŠ•

โœ‚๏ธแˆ‹แˆœแˆซ แˆ›แˆตแ‰†แˆซแˆจแŒฅ แˆ›แˆตแ‰ แˆณแ‰ต แ‹ˆแ‹ญแŠ•แˆ แˆ›แˆณแŒ แ แŠจแˆแˆˆแŒ‰  แŠฅแŠ•แ‹ณแ‹ซแˆตแ‰ก แˆแˆ‰แŠ•แˆ แˆ›แˆฝแŠ–แ‰ฝ แŠ แˆตแŒˆแ‰ฅแ‰ฐแŠ“แˆ

๐Ÿ”—แŒแˆฎ (แ‰ถแŠ•แ‹ฒแŠ–) แŒฅแˆญแˆต แˆ›แˆตแ‰ แŒ€แ‰ต แ‹ˆแ‹ญแŠ•แˆ แˆ›แˆณแŒ แ แŠซแˆฐแ‰ก แˆˆแˆฑแˆ แˆ›แˆฝแŠ‘ แ‰ แŒƒแ‰ฝแŠ• แАแ‹‰

๐Ÿ“แˆ›แŠ•แŠ›แ‹‰แŠ•แˆ แ‹จแˆžแ‹ฐแŠแŠญ แˆตแˆซแ‹Žแ‰ฝแŠ• แ‹จแˆšแˆฐแˆฉ แ‰ฅแ‰ แ‰ฃแˆˆแˆ™แ‹ซแ‹Žแ‰ฝแˆ แŠ แˆ‰แŠ•

โ˜Ž๏ธแ‹ญแ‹ฐแ‹‰แˆ‰แˆแŠ• แ‹ซแˆ›แŠญแˆฉแŠ•

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๐Ÿ‘‰Bonding of Old and New Concrete?

๐ŸšงIn construction, there always comes a time when there is a need to bond hardened concrete (substrate) with fresh concrete topping/overlay. The aim of this post is to explain how to bond old and fresh concrete successfully.
Furthermore, we will review the strength of the interfacial bond between old and new concrete based on laboratory studies.

โบProper bonding is very important for adequate performance when the fresh concrete topping is used to overlay an existing hardened concrete. This construction feature is usually found in bridge deck construction, concrete pavements, precast filigree slab, pile caps (in some cases) etc. Proper bonding between the substrate and the topping is not always guaranteed unless simple precautions are taken.

โบFor adequate bonding, it is very important to prepare the surface of the substrate adequately.

โญ๏ธThe preparation of the surface usually involves:

๐Ÿ“ŒRoughening the surface, and removal of all dirt, oil, grease, and loosened or unbonded portions of the existing concrete.

โบBy implication, the surface of the substrate should be hard, firm, clean, and free from loosened particles. This can be achieved by the use of chipping hammers, wire brushing the surface, etc.

๐Ÿ“ŒAfter this is done, the exposed concrete surface can be cleaned by using pressurized clean water, air, etc. The man hours involved depend on the area of the surface, location, and the ease of cleaning (e.g reinforcement obstruction).

๐Ÿ“ŒAfter surface preparation, there is usually a need to apply a bonding agent on the surface of the existing concrete in order to facilitate the bonding. Epoxy-based bonding agents are very popular for such operations. It is recommended that a bonding agent is applied prior to casting the fresh concrete.  In essence, the procedure should be โ€˜wet-to-wetโ€™ as the bonding agent should not be allowed to dry before the fresh concrete topping is placed.

๐Ÿ“ŒIn a research carried out by Vandhiyan and Kathiravan (2017), the compressive strength of monolithic and bonded concrete was compared using 150mm x 150mm cube specimens at 28 days. With an epoxy-based bonding agent, the compressive strength of the bonded concrete was about 5% less than the monolithic strength, while without the bonding agent, the compressive strength was about 28% less than the monolithic compressive strength.

๐Ÿ“ŒResearch has also shown that the moisture condition of the substrate affects the shear bond strength of bonded concrete. Shin and Wan (2010) investigated the interfacial bond strength of old and new concrete considering saturated surface dry (SSD) and air dry conditions. Saturated surface dry is a condition in which the concrete contains moisture that is equal to its potential absorption, without the surface being wet or damp.

๐Ÿ“ŒAt a water/cement ratio of 0.45 (for the topping concrete), the shear bond strength at the interface was about 44% greater when the substrate was at SSD condition than when it was air dry. At a water/cement ratio of 0.6 for the topping layer, an increase in shear bond strength was recorded, but there was a reduction in the compressive strength of the concrete.

โบSo the recommendation in this article is that when casting a topping layer of fresh concrete on old concrete, adhere to the following guidelines;-

(1) Prepare the surface properly
(2) Make sure that the substrate is at saturated surface dry condition
(3) Use a bonding agent and follow the manufacturerโ€™s technical recommendation properly.

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