2. SP -1279
Specification for Civil Construction Works
AFC Drawings & Method Statements
Surveying
Excavation
Trench Works
Backfilling
Fencing
Hard Landscaping
Graded Roads
3. AFC Drawings & MS
• Approved Drawings
• Latest Revision
• Controlled Copy from Document Controller
4. Surveying
• Calibration of Survey Instruments
• Permanent Benchmarks
• Project Reference
– For Coordinates : Universal Transverse Mercator(UTM) - Clarke 1880,
Zone 40
– For Level - Datum PSHD93 (PDO Survey Horizontal Datum 1993)
5. Excavation
• Work Permit prior to start
• Identification of Underground Utilities / Services
• Method of Excavation accordance with BS 6031
• Mechanical or hand methods where impractical - Blasting in
rock areas with approval
• Dimensions, Orientation & Level as shown AFC Drawings
• Shoring (slope) is required when max depth is 1.2m
• Excavated material shall be deposited at least 1 meter away
from the edge
6. Trench Works
• Free from rocks, sharp edge stones, tree roots
• Inspection Clearance for filling
• PVC Ducts for Crossing
• Adjacent to and deeper than an existing structure
• Deepest excavation should be excavated first
7. Backfilling
• Type of Soil (Ref : Table R1) – Type A (max 50mm) & Type B (max 25mm)
• Specified Fill material from Approved Source
• Maximum 5000 Cum for Each Stockpiles
• One Complete Test Analysis for each stockpiles – BS 1377
– Particle Analysis
– Atterberg Limit (Liquid & Plastic Limit)
– Specific Gravity
– Maximum Dry Density with Optimum Moisture Content
– CBR Value
– Chemical Analysis (Chloride, Sulphate & Gypsum)
• One Compaction Test for each layer - 1000sq.m (max)
8. Backfilling
Laying & Compaction
• Compaction layer of 250mm thick for below 450mm from FGL
• Compaction layer of 150mm thick for the 450mm from FGL
• Density of Compaction from MDD for Type A - 98% & Type B -95%
• Optimum Moisture Content – Below 2% and above +1 %
9. Fencing
• Type of Fencing
• Type A – High Security Fence
• Type B – Medium Security Fence
• Type C – Temporary Fence
• Marking prior to excavation
• Straining Post at every 30m (max) – Change of Direction, Fence & Gate
Posts
• Intermediate Post at every 3m (max)
• Earthing Boss – AFC Drawings (welded prior to paint application)
10. Hard Landscaping
Rip Rap
Single Size Stone, Comprising crushed rock or boulder
Nominal Sizes - 450,300 or 150mm
Mortar Proportions – AFC Drawings
Line, Level & Slope
11. Graded Roads
Type of Graded Roads
Temporary Road (Carriage Way -9m & Strip -2.5m)
• Base – 150mm (Type B1 material)
Area Road (Carriage Way -9m & Strip -2.5m)
• Sub-Base - 150mm (Type B1 material)
• Base - 150mm (Type B material)
Radial Road (Carriage Way -9m, Hard Shoulder -2.5m & Strip 2.5m)
Trunk Road (Carriage Way -10m, Hard Shoulder -2m & Strip 2.5m)
• Sub-Base - 150mm (Type B1 material)
• Base 1st Layer - 150mm (Type B material)
• Base 2nd Layer - 150mm (Type A material)
13. Materials
• Approved Vendor List
• Material Approval Sheet (MAS)
• Incoming Material Inspection Report (IMIR)
• Approved Source / Manufacturer / Vendor
• Complying Specification / AFC Drawing Requirements
• Test Records/ Reports
• Material Storage
14. Materials
• Cement – BS EN -157 / ASTM C 150
• Aggregates – BS EN 12620, Testing - BS EN 1367, 933 & 1097 & BS
812
• Steel – BS 4449, Wire Mesh – BS 4483 & Tying Wire – 16 Gauge
• Water – BS EN 1008 (Table 9,10 & 11)
• Admixtures – BS 8443
• Mould Oil – Mineral Type oil, free from Chloride & Sulphate
15. Formwork
• Dimension & Shape accordance with AFC Drawings
• Design Calculation & Shop Dwg is required for Heavy Structure
• Cleared out of dust, wood shavings, dirt and other extraneous
• 25mm Chamfer on all external exposed corners
• Thermocouple is required where Least Dimension exceed 1m
• Fixing with Proper Supports & Easy Removal
• Mould oil should be applied prior to Reinforcement fix
• Permissible Limits 3mm from all surface and Table 21
• Formwork Removal – Table 14
18. Reinforcement
• Bar Bending Schedule of Cut & Bend in Accordance with BS 8666
• Fixing , Spacing & Cover of bars with respect to AFC Drawings
• Tying wire knots shall be within cage not towards the concrete
surface
• Min Cover 30mm or AFC Drawings (75mm when concrete directly
touch with soil)
• Spacer or chairs to be fix with maximum spacing of 1m by staggered
• PVC spacers shall not be used
19. Concrete Mix Design
• Grade of Concrete – C35, C10, etc.
• Raw Material Testing
• Mix Proportion
• Admixtures (Table - 8)
– Super plasticizer is a high range water reducing (Master Rheobuild 857)
– Migrating Corrosion Inhibitor (MCI)
• Batching Plant Mixture Calibration
• Material Storage
• Trail Mix
• Testing of Concrete
21. Concrete Sampling
• Approved Mix Design
• Batching Time Vs Retention Time
• Ambient Temperature (max – 46o C)
• Concrete Temperature (max – 30o C)
• Slump Test (75mm to 125mm)
• Identification on Cubes
• Cubes - 4nos for 7 &28 days and 1no for spare until project end
22. Concrete Placing
• Pour Clearance
• Arrangements of placing concrete
• Interval of Concrete shall not be left more than 30 minutes
• Height of Pour not exceeding 1.5m (or provide chutes of 1 in 2 Slope)
• Concrete layers not exceeding 300mm in depth
• No vibration or forces within 72 hours. (If Concrete discontinues)
• Hardened concrete, existing work thoroughly scrabbled to remove
all latent
• No further load until the minimum target mean strength achieve
23. Concrete Finishing
Type of Finishes
• Wooden float finish on top surfaces of floor slabs & paving (if NO
further layer)
• Rough for a proper key on Surfaces of subsequent plastering, tiling or
grouting
• Rubdown or smooth finish for Painted surfaces
• Neat Tamping mark / proper key while still ‘green’ for Screed
Concrete
24. Curing
• Curing – not less than 7 days
• Exposed Surface covered by Polythene sheet after finishing
• After 24 hours / Stiffened, Replace the Polythene sheet with wet
hessian cloth
• Frequent water application under the polythene sheet to keep the
hessian permanently wet
• Alternatively, the exposed surface may be ponded using mixing-
quality water
• Approved Curing Compound agent
25. Protective Coating
• Exposed Holes & Surface Imperfections are filled with approved
repair material prior to coating
• For Contact with Soil & up to 300mm from Grade Level
– Two Coats of Protective System with Glass Matt (WFT 400 microns)
– Glass Mat ( 120-150 GSM)
• For Above 300mm from Grade Level
– Two Coats of Fosroc Dekguard S / Equivalent (DFT 350 microns)
• For contact with Oil/water mixture
– Petro-chemical resistant coating
26. Grouting
Type of Grouts
Sand Cement Grout – (Static Structures)
1:2 (Cement & Sand) with Water ratio : 0.4max)
Compressive strength at 28 days – 35N/mm2 and at 7days 25N/mm2
Non-Shrink Grout – (Rotating & Reciprocating Equipment)
Cement Based Non-Shrink – 75N/mm2
Epoxy Based Non-Shrink – 95N/mm2
27. Grouting
Using of Type S & F Sleeves – Glass Wool to be fill up to 65mm from Top
Soaking for 24hours prior to grouting & Excess water to be remove
For Epoxy Grout – Surface to be dry unless specified
Verify the Gaps between Base plate and concrete surface 25mm to 50mm
Mix Temperature – 27oC or manufacturer recommendation
Placing of Grout – 30min not later the mixing completion
Curing – 7days
