Standard Construction Specifications Part 2 Abu Dhabi !!top!! [SAFE]

This is a detailed technical report examining Part 2 of the Standard Construction Specifications (SCS) for the Emirate of Abu Dhabi , primarily as issued by the Abu Dhabi Department of Municipalities and Transport (DMT) — historically known as the Department of Municipal Affairs (DMA). Disclaimer: Specifications evolve. The current governing version is typically the Abu Dhabi SCS (General Specifications for Buildings and Civil Engineering Works) most recently updated circa 2018–2020. This report reflects the structural and technical intent of Part 2 as it standardly appears.

Deep Technical Report: Standard Construction Specifications – Part 2 (Abu Dhabi) 1. Executive Summary Part 2 of the Abu Dhabi SCS is titled “Site Works and Demolition” or sometimes “Site Preparation, Earthworks, and Demolition,” depending on the edition. It governs all activities prior to structural construction: site clearance, demolition of existing structures, excavation, filling, compaction, and site grading. Unlike international standards (e.g., BS, ACI, ASTM) which are used as references, Part 2 adapts these to the unique geotechnical and climatic conditions of Abu Dhabi: sabkha (salt crust) soils, high groundwater table, aggressive chlorides/sulfates, and extreme heat. Key regulatory driver: Establishes requirements to prevent foundation failure, soil collapse, and infrastructure damage caused by inadequate earthworks in arid coastal environments.

2. Scope of Part 2 (Typical Clause Structure) | Clause Group | Content | |----------------|-------------| | 2.1 | General requirements for site works | | 2.2 | Demolition and removal of structures | | 2.3 | Site clearance (topsoil, vegetation, debris) | | 2.4 | Excavation (including rock excavation) | | 2.5 | Filling materials and earthwork | | 2.6 | Compaction and field density testing | | 2.7 | Backfilling around foundations and utilities | | 2.8 | Disposal of surplus materials | | 2.9 | Protection of existing services and utilities |

3. Deep Dive into Critical Technical Clauses 3.1 Demolition (Clause 2.2) standard construction specifications part 2 abu dhabi

Requirement: Full or partial demolition to be done in a controlled sequence to avoid damage to adjacent structures or utilities. Abu Dhabi specifics: Adjacent buildings often have shallow foundations on variable sands. Vibration limits are strict (≤ 12 mm/s PPV at nearest sensitive structure). Salvage and waste: All reinforcing steel, aluminum, and concrete > 200 mm thick must be separated for recycling (Abu Dhabi Waste Management Center rules). Hazardous materials: Asbestos, PCB-containing light ballasts, lead paint, and mercury vapor lamps must be removed prior to demolition, per EAD (Environment Agency – Abu Dhabi) requirements.

3.2 Site Clearance (Clause 2.3)

Topsoil removal: 150–300 mm removal required unless topsoil is to be reused for landscaping. Vegetation: Removal of deep-rooted vegetation (e.g., Prosopis juliflora — mesquite) is mandatory because roots desiccate subgrade soils, causing settlement. Debris classification: Construction & Demolition (C&D) waste cannot be mixed with general waste. This is a detailed technical report examining Part

3.3 Excavation (Clause 2.4) Key technical challenge in Abu Dhabi:

High groundwater table (often 0.5–2 m below grade). Sabkha layers: Extremely weak, salt-rich, collapsible when wet.

Requirements:

Temporary dewatering: Must be continuous and not cause settlement of adjacent structures (pumping tests required for deep excavations > 2 m). Over-excavation: If unsuitable material (sabkha, organic, highly saline) is encountered, excavation must extend down to competent bearing layer, as directed by the Engineer. Slope stability: In granular soils, slopes cannot exceed 1.5H:1V unless shored. In cohesive soils (rare in AD), 1:1. Rock excavation: Defined as material requiring blasting or ripping with D10/D11 dozers. Blasting requires special permit from Abu Dhabi Police Explosives Department.

3.4 Filling Materials (Clause 2.5) — Most critical clause | Material Type | Source | Acceptance Criteria | |------------------|------------|--------------------------| | Selected fill | Borrow pit (approved quarry, e.g., Al Ain or Sweihan) | Max particle size 75 mm, ≤ 5% fines passing #200, sulfate content ≤ 0.5% by weight | | Granular sub-base | Same | CBR ≥ 30, sand equivalent ≥ 35, liquid limit ≤ 25, plasticity index ≤ 6 | | Structural fill | On-site or imported | No organic matter, no gypsum bands, chloride ≤ 0.3% (for reinforced zone) | | Fill behind retaining walls | Free-draining granular material | ≤ 12% passing #200 sieve | Abu Dhabi special restriction: No sabkha material is allowed in structural fills or below footings, even if compacted. Salt attack on concrete and rebar is unacceptable. 3.5 Compaction and Testing (Clause 2.6)