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ASCON DESIGN DEPARTMENT DEPARTMENT Project:
2B+G+3+Duplex Residential Development / CENTRE COURT
Prepared by
Part: Part:
Cost Cost compar compariso ison n betwee between n conven conventio tional nal RCC RCC Flat Flat Slab Slab Syste System m & Post Post Tensio Tensioned ned Flat Flat Slab Slab Sys System tem
Typical Floor Comparision Based On Value Engineered Option Assumption
Sheik Mohamed
Date
18-08-09
Rev
0
Floor:
Purpose Imposed Load Span
Expenses incurred at Site due to PT Manpower to support PT related activities Grouting Tendons Pour strip concrete works Edge shuttering & other miscell works
Residential 2 kN/m 9 7.8 m
2
6.25 Dhs / m 2 2.25 Dhs / m 2 1.5 Dhs / m
= = =
10 Dhs / m
Total Slab Thickness SAVINGS PT Slab
(Value Engineered Slab Thickness)
210 mm Savings in Concrete
RCC Flat Slab
3
2
=
0.05 m / m
=
17.5 Dhs / m
=
24 kg/m
260 mm Concrete @ 350 Dhs / m
3
Untensioned Reinforcement PT Slab Basic Mesh at bottom Slab edge reinforcement Pour strip reinforcement Reinforcement over pier
Savings in Steel 35 7 3 14
kg/m 3 kg/m 3 kg/m kg/m
7 kg/m 6 kg/m
Reinforcement around anchorages Reinforcement for earth quake forces
2
3 2
Savings in Steel = (Steel Price including cut, bend bend & fix @ 3000 dhs /Tons)
72 Dhs/m
Total Savings
=
89 Dhs/m
PT Service charge
=
50 Dhs/m
Expenses incurred at site due to PT Works
=
10 Dhs/m
Total PT Related Expenses
=
60 Dhs/m
Net Savings
=
Assuming an average Floor area area
=
29 Dhs/m 2 3000 m
EXPENSES For an average slab thickness of 210mm
Total =
3
72 kg/m 2 15.12 kg/m
RCC Slab Reinforcement (Steel in RCC slab varies between between 140 140 - 160 kg /m ) For an average slab thickness of 260mm
=
2
2
150 kg/m
39 kg/m
2
2
Net Savings per floor
=
87,420.00 Dhs
ASCON DESIGN DEPARTMENT Project:
2B+G+3+Duplex Residential Development / CENTRE COURT
Prepared by
Part:
Cost comparison between conventional RCC Flat Slab System & Post Tensioned Flat Slab System
Floor:
Typical Floors (First - Roof) Comparision Based on Existing Detail
Sheik Mohamed
Date
18-08-09
Rev
0
Expenses incurred at Site due to PT
Assumption Purpose Imposed Load Span
Manpower to support PT related activities Grouting Tendons Pour strip concrete works Edge shuttering & other miscell works
Residential 2 kN/m 14 7.8 m
2
6.25 Dhs / m 2 2.25 Dhs / m 2 1.5 Dhs / m
= = =
10.00 Dhs / m
Total Slab Thickness SAVINGS PT Slab
(Thickness Proposed by Project Consultant)
250 mm Savings in Concrete
RCC Flat Slab
=
3
0.01 m / m
2
260 mm Concrete @ 350 Dhs / m
3
=
3.5 Dhs / m
=
22 kg/m
PT Slab Untensioned Reinforcement Bas ic Mesh at bottom & Top (Incl tem perature effec ts) Slab edge reinforcement Pour strip reinforcement Reinforcement over pier
Savings in Steel 35 7 3 14
7 kg/m 6 kg/m
Reinforcement around anchorages Reinforcement for earth quake forces
2
3
kg/m 3 kg/m 3 kg/m kg/m
2
Savings in Steel = 67 Dhs/m (Steel Price including Material, cut, bend & fix @ 3000 dhs /Tons) =
70.40 Dhs/m
PT Service charge
=
50 Dhs/m
Expenses incurred at site due to PT Works
=
10 Dhs/m
Total PT Related Expenses
=
60 Dhs/m
Net Savings
=
10.40 Dhs/m
Assuming average Floor area
=
3000 m
Net Savings per floor
=
Total Savings EXPENSES
For The Slab thickness of 250mm
Total =
3
72 kg/m 2 18 kg/m
RCC Slab Reinforcement (Steel in RCC slab varies between 140 - 160 kg /m ) For the slab thickness of 260mm
=
2
2
155 kg/m
40.3 kg/m
2
31,200.00 Dhs
2
2
Span To Depth Ratio For PT Slab RCC Slab
= =
38 33
ASCON DESIGN DEPARTMENT Project:
Value Analysis Exercise
Prepared by
Sheik Mohamed
Part:
Cost comparision between conventional RCC Flat Slab system & Post Tensioned Flat Slab System
Floor:
Mechanical Floor
Date
9/3/2009 Rev
0
Expenses incurred at Site due to PT Assumption Purpose Imposed Load Span
Manpower to support PT related activities Grouting Tendons Pour strip concrete works Edge shuttering & other miscell works
Mechanical Floor 2
14 kN/m m
8.5 - 9
2
6.25 Dhs / m 2 2.25 Dhs / m 2 1.5 Dhs / m
= = =
10 Dhs / m
Total
2
Slab Thickness SAVINGS PT Slab
250 mm
RCC Flat Slab
300 mm
3
2
Savings in Concrete = 0.05 m / m (Assuming average PT slab thickness as 230mm against RCC slab of 310mm thick) Concrete @ 350 Dhs / m
3
2
=
17.5 Dhs / m
=
29 kg/m
Untensioned Reinforcement PT Slab Basic Mesh at bottom & Top (Incl temperature effects) Slab edge reinforcement Pour strip reinforcement Reinforcement over pier
Savings in Steel 35 7 3 14
7 kg/m 6 kg/m
Reinforcement around anchorages Reinforcement for earth quake forces
2
3
kg/m 3 kg/m 3 kg/m kg/m
2
Savings in Steel = (Steel Price including cut, bend & fix @ 2500 dhs /Tons)
71 Dhs/m
Total Savings
=
89 Dhs/m
PT Service charge
=
60 Dhs/m
Expenses incurred at site due to PT Works
=
10 Dhs/m
Total PT Related Expenses
=
70 Dhs/m
Net Savings
=
19 Dhs/m
Assuming average Floor area
=
Net Savings per floor
=
EXPENSES For an average slab thickness of 250mm
Total =
3
72 kg/m 2 18 kg/m
RCC Slab Reinforcement (Steel in RCC slab varies between 140 - 160 kg /m ) For an average slab thickness of 300mm
