Transcript SAVING COST USING PT - NOOR-National Office of Raw Materials

National Office of Raw Materials of Pre-stressing Systems .LLC
www.noorprestressing.com
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NOOR PRE-STRESSING LLC.
www.noorprestressing.com
NOOR-National Office of Raw Materials of Pre-stressing Systems. LLC – USA
Middle East Office
Tel: +971.6745.2732
Fax: +971.6745.2738
P.O.Box:46480, Sharjah UAE
&
Join Venture with
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NOOR PRE-STRESSING LLC.
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COST SAVING BUDGET IF YOU GO TO PT
WORK
INSTEAD OF RC WORK
If you go for RC work, you may be using a lot of steel but if you go for PT work, you
will save a lot on steel which will directly reduce your cost.
How ?
More Steel = High Cost and Less Steel = Low Cost.
For example:
In RC work 1 M3 = 150 kg steel
and steel per kg is 2.7AED.So cost of steel for 1 M3 =150 kg * 2.7 approx = 405 AED
But in PT work 1 M3 = 50kg steel ,so cost of steel for 1M3 = 50kg *2.7 approx
AED= 135 AED
So the difference of cost between both is AED 405-135 =270 AED which you will be
saving.
The PT work cost’s around 180 AED approx
Now for PT work the amount you will spend for 1 M3 will be 135 + 180 =315 AED
And after paying for PT work you will still save 270- 180 = 90 AED approx
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PRE-STRESSNG
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NOOR
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NOOR SYSTEMS
NOOR systems includes the materials mentioned below.
• Anchors Set S/3
• Anchors Set S/5
• Wedges
• NOOR-G Chemicals
• Galvanized Spiral Ducts
• PC Strands
These all materials are of a very high standard and
quality.
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Flat anchorage PT System
Live End Anchorage System
NOOR is a flat-anchorage post-tensioning system using 1 to 5 seven-wire pre-stressing
strands. The pre-stressing strands have a nominal diameter / nominal cross section of 12.7
mm / 100 mm2, 15.3 mm / 140mm2 or 15.7 mm / 150mm2 and a maximum characteristic
tensile strength of 1960 MPA. The available anchorages are the stressing or active
anchorages (Type A), the fixed or passive anchorages (Type F) and fixed as well as movable
couplers (Type K). The tendon sheaths are corrugated steel ducts or PT plastic ducts, which
are injected with a high performance groutThe life end anchorage system is normally adopted
for bonded tendon. The strands are individually gripped in one slab anchor head unit and
transmit their pre-stressing forces by means of slab type anchor plate casting unit. The
strands are stressed individually by means of a mono strand jack. The strands are contained
in one flat duct which is made of corrugated galvanized or non-galvanized metal. To ensure
corrosion protection and to give adequate bond strength, the tendons are filled with suitable
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cement grout mix after complete stressing of the strand
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WEDGES
A wedge assembly typically has 2 or 3 part wedges with a spring wire retainer clip in a groove
around the thick end. It is placed around a strand to grip and secure it by wedge action in a
tapered hole through a barrel.
Available in two nominal sizes,12.7mm (0.5in) and 15.2mm (0.6in) diameter.
Each individual wedge segment is examined for exact tooth shape by computer cameras.
Anchor barrels are manufactured from high tensile crack-tested basic material in a special
process, and are only stamped and released for dispatch after final ultrasonic testing. In this
way, we ensure the highest industrial safety and long life service of the anchor components
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R82 Galvanized Metal
Corrugated Duct - ASTM A653
NOOR Galvanized Spiral Metal Duct or High Density Polyethylene
Duct meets all physical and structural recommendations for post
tensioning duct as laid down by the Post Tensioning Institute (of the
United States). The Duct is available in 2”, 3”, and 4” diameter with
couplings and reducer couplings for all sizes.
R75 Polypropylene & Polyethylene Corrugated Duct
The stable characteristics of NOOR polypropylene & polyethylene duct
are normally preferred where additional corrosion protection is desirable.
Polypropylene Duct has been approved by the Florida DOT for internal
tendons and is available in 2-3/8” diameter. Polyethylene Duct is
available in 2”, 3”, and 4” diameter. Couplings and reducer couplings are
available for all sizes.
Type
Tendo
n unit
h
H
b
B
S
Plastic duct
PT-PLUS
5-2,6-2
0.75
1.18
1.65
2.09
0.08
Plastic duct
PT-PLUS
5-4,6-4
0.83
1.38
2.83
3.39
0.08
Steel duct
5-4,6-4
0.71
0.83
2.83
2.95
0.01
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AL NOOR PRE-STRESSNG CONCERET L.L.C
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NOOR PRE-STRESSING
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NOOR-G CHEMICAL
Expansive agent for the production of shrinkage-compensating and high
strength concrete
NOOR-G is an inorganic product in powder form to be used in
addition to the other components of concrete for producing
shrinkage compensating and high strength concrete. It is a
special clinker, burnt at high temperature, rich in free lime and
whose minor compounds are calcium silicates, aluminates,
Ferro-aluminates and sulphates.
The use of super plasticizers is particularly recommended
when using NOOR - G as they significantly reduce the water
content and thus the potential shrinkage of the concrete to be
compensated.
Compressive Strength (70° F Dry Environment) 0.4 w/c Ratio
Time
PSI
MPa
1 Day
1,800
12.4
3 Days
4,000
27.5
7 Days
6,000
41.4
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USAGE
• Tanks
• Reservoirs and swimming-pools
• Water treatment plants
• Containers for liquids and/or gases
• Pre-stressed circular structures
• Sewers, tunnels and canals
• Injections for sealing of concrete elements
• Reinforced & Pre-stressed Concrete Structures
• Long structures
• Thin solid structures
• Pre-stressed concrete beams
• Annular beams for sports facilities
• Bridge decks
• Filling of cavities
• Industrial floors
• Weakly reinforced hyperstatic structures
• Shields for nuclear plants
• Road and railway tunnel vaults
• Foundations and underpinnings
• Hyperstatic arc-bridges
• Box culverts, domes and thin structures in reinforced concrete
• Roofs and covers in architectural concrete
Prefabrications
• Repairs of vertical structures and loaded pillar
• Rock consolidation
Product Advantage
NOOR - G reduces the drying shrinkage of concrete by reducing the capillary tension of the pore water in concrete.
• Reductions in drying shrinkage of up to 50% have been obtained. The benefits derived from the reduction in drying shrinkage include:
• Dramatic reduction in crack occurrence caused by drying shrinkage
• Increased joint spacing in concrete pavements and slab-on-ground
• Improved concrete durability
• Longer service life
• High impermeability and strength, anti-crack and freeze-thaw resistance concrete Excellent for pumping: Does not segregate...even at
high flow. No build-up on equipment hopper. Non-corrosive , does not contain chlorides. Meets CRD C-621. Meets ASTM C-1107 (Grade C).
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Shows positive expansion when tested in accordance with ASTM C-827.
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PC STRANDS
Strand Diameter (in.)
.500
.600
Min. Breaking Strength, TU (kips)
41.3
58.6
Steel Area (in2)
.153
.217
Strand Weight (lb/ft)
.520
.740
Min. Yield Strength, 1% Elongation,
TY (kips)
37.17
52.74
Post-tension (PT) strands are manufactured in accordance to the standard American
Society for Testing and Materials (ASTM) A416. It is composed of seven treated carbon steel
wires, six of which are arranged in a helical pattern around a slightly larger center wire (Figure
3.1).
PT strand is available in several diameters ranging from .250 in. to .600 in. For most posttensioning applications, the standard size strand is either the .500 in. or .600 in diameter
(ASTM). Breaking strength requirements and yield strength requirements are shown in Table
Mainly used as auxiliary reinforcing tendon for concrete structure such as Pre-stressed
concrete girders for railway &highway bridges and flyovers, rock and earth anchoring
construction, and multi-floor high rise buildings.
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Facts about Post-Tensioned Slabs:
Approved Foundation Construction - Post-tensioned slabs are approved by the F.H.A. and
V.A. since 1967.
All National Building codes approved post-tensioning. Current IBC / IRC indicates that in
expansive soils with the Plasticity Index greater than 15, requires that the foundation
system be designed according to WRI /CRSI (Wire Reinforcement - Concrete Reinforcing
Institute) or PTI (Post-Tension Institute) Control of Cracks – Post-tensioned slabs control
cracks much better than other reinforced slabs, due to the squeezing pressure (tension) of
the cables compressing the cracks.
Time Savings - Post -tensioned can be installed much faster that other reinforced
foundation systems. A typical residential foundation takes 3-4 hours to install. Time is also
saved by, using fewer joints, narrower footings, less digging, and easier to clean up in the
event of inclement weather.
Reinforcing Savings - As steel and concrete increase in pricing, the savings with a
post- tensioned slab will increase, because the quantity of steel and concrete required for
a post-tensioned slab is less than for a conventionally reinforced foundation. Clean out of
the footings after a rain is much faster and neater than re-bar type foundations.
Engineered Foundations - The F.H.A., V.A. IBC and IRC accept post-tensioning, but it
must be engineered and stamped by a licensed engineer.
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Facts about Post-Tensioned Slabs:
Fewer Joints - Large concrete areas, such as tennis courts, parking lots, warehouses,
metal buildings can have joint spacing increased to minimize cost of joints and long- term
maintenance of the joints.
Deflection Control - Expansive soils, which can move when wet and shrink when drying
can cause foundation movements and cracking.
Post- tensioning increases the slab stiffness and by its increased flexural and tensile
capacities, is more resistant to problematic soils.
Movement of soils can sometimes be significant enough to move the structure.
Slab on ground support foundation systems are still interactive with the soil.
Improved Modulus of Rupture – It is a fact that concrete shrinks when it dries and cracks.
By utilizing a two part tensioning process, shrinkage cracking can be reduced.
Possible Less Concrete - (This depends on the foundation and what it is being
compared to.) Typical post- tension beams (ribs) are 12 inches wide versus 16 inches
wide for conventional. For an equivalent slab design, (stiffness) post-tensioning will
require less concrete.
Improved Flatness and Slab Levelness - With fewer joints and greater joint spacing, slab
curling is greatly reduced. This produces a smoother ride for forklifts.
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NOOR
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CONCERET L.L.C
NOOR
PRE-STRESSING
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Why Go for Al Noor Pre-Stressing
• Al Noor Pre-Stressing does not compromise on its quality right from
the labours, foremans, engineers and even the materials &
equipments.
• We believe that a trust and understanding between us and our
customer makes a strong and everlasting bonding
• And last but not the least work taken by us is completed on time
from our end.
• These are the strong points that makes our customers choose
Al Noor Pre-Stressing.
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Headquarter Office:
1133 Broadway, Suite 706,
New York, NY10010, USA.
+1 (212) 631 5819 Phone
+1 (212) 631 5820 Fax
Middle East Office:
Sharjah - Abu Sheghara UAE.
PO.Box: 46480
+9716 575 8987 Phone
+9716 575 8487 Fax
For all other general queries
[email protected]
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