- Open Access
- Total Downloads : 151
- Authors : Rakesh Verma, Amit Singhal
- Paper ID : IJERTCONV5IS03017
- Volume & Issue : ICADEMS – 2017 (Volume 5 – Issue 03)
- Published (First Online): 24-04-2018
- ISSN (Online) : 2278-0181
- Publisher Name : IJERT
- License: This work is licensed under a Creative Commons Attribution 4.0 International License
A Review on Study of CPCC, FBEC & CRSD as Reinforcing Bar
Rakesh Verma1,
1Scholar,
Civil Engineering Department GITAM Kablana, India
Amit Singhal2
2Assitant Professor, Civil Engineering Department
GITAM Kablana, India
The concentration of the inlet wastewater of urban sewage treatment plants is much lower than the expected level in the design stage, mainly because of the problems of construction, management and maintenance of the drainage systems. Through investigation of the urban drainage pipelines, primary problems of drainage network damage, local unreasonable elevation design, pipe blockage and drainage system confusion, etc. were found. Combining the local actual situation, some corresponding engineering and management measures and some feasible suggestions for drainage pipe construction, management and maintenance are put forward.
Index Terms CPCC, FBEC & CRSD
-
INTRODUCTION
Main reasons failure of structures is due to corrosion of embedded steel reinforcement in concrete. Therefore corrosion control of steel reinforcement is a very Important to save the structure, First and foremost for corrosion can be controlled by the good quality of concrete and perfect workmanship. Corrosion reduce the load carrying capacity of structure and also it break down the bond between concrete and steel so anti corrosion bars are required to make the structure durable and lifelong. Anti corrosion bar inform of CPCC, FBEC & CRSD used. [1]
A. Means of Terms.
CPCC- Cement-polymer Composite Coated Rebar FBEC- Fusion Bonded Epoxy Coated Rebar CRSD- corrosion Resistant Steel Deformed Rebar
-
CEMENT-POLYMER COMPOSITE COATED REBAR (CPCC)
S.NO
parameter
Requirement
1.
Pre-treatment and surface reparation
Sand Rubbing to the surface of steel.
2.
Primer Coat
Apply within blasting.
4
hours
of
sand
3.
Sealer Coat
After prime coat and within 30 minutes of prime coat, this should be given. Thickness 15- microns plus minus 25 microns.
4.
Air curing
Six hours before use in the work.
5.
Continuity of coating
Continuity of coating till the no defects such as cracking, bulging, peeling, no rust mark. Appearing on surface by visually inspected
6.
Adhesion of coating- test
Coated bars are bent at 120° around a mandrel. NO peeling or cracking should be observed on outer radius.
7.
Stacking
Stack bars on buffer material.
8.
Cutting, bending, welding
Coat bars can be cut and bent. Cut ends and weld positions should be treated with same formulation.
Cement- polymer composite coated rebar consist of De- rusting Solution Alkaline Powder Phosphate Jelly Inhibitor Solution Sealing Solution
Fig.1 Show the phenomena of steel Reinforcement of MS Bar
The system has been developed mainly as a factory / shop process.
-
The main use development of this system is that the base metal of rebars, contains
Electrons which get readily released in corrosive environment leading to oxidation of iron and thereby formation of Ferrous Oxide (II) (rust) as principle deterrent to destroy the steel
-
In order to prevent this oxidation a surface coating capable of interacting the released electrons is provided to neutralize the oxidation of iron and make safe the steel.
-
Further pre-stressing and reinforcing steel, in concrete during Fusion bonded epoxy is basically 100% solid finely ground
service life, are exposed to an alkaline environment and this necessitates introductions of a top coat which should be compatible to primer and alkaline environment for steel. [2]
fused powder particles, which applied on the bars when heated when heated; melt to form a continuous adherent film to prevent from corrosion.
Cement-polymer Composite Coated Rebar (CPCC)
-
There is no passive ting primer film provided in case of FBEC rebars
-
This coating introduces a medium of weakness in the path of an intimate bond between rebar and alkaline concrete.
-
Extensive investigation carried out on 40 bridges in Florida Key in USA has revealed that disbandment can occur easily in the FBEC rebars which lacked passive action layer of ferrous oxide (II) and is a precursor to corrosion.
-
Higher co- efficient of Thermal Expansion of fusion bonded epoxies imposes large thermal stresses in epoxy coating leading to its early failure. [3]
-
-
-
FUSION BONDED EPOXY COATED REBAR (FBEC)
Fusion bonded epoxy coated rebar consist of
No.
parameter
Requirement
1.
Cleaning of bar
Bars are first rubbed and cleaned from surface contamination such as oil, grease etc. by chemical process before shot blasting.
2
Pre-treatment and surface preparation
The reinforcement bars are cleaned by shot blasting or grit blasting to white or near white stage.
After the surface preparation the cleaned bars are heated up the temperature 230° c in preset
heaters..
3.
Coating
Hot bars are then fed to the coating booth, where the epoxy powder is
sprayed electro statically.
4.
Curing and Cooling
After the coating Coated bars are then cured and forced cooled by
water spraying to enable handling and testing.
4.
Continuity of coating
The adhesion of the coated bars is continuing till the surface of bars is fully coated. and it can be checked
by the bending of the bar.
5.
Testing of performance of rebar
Various other tests are performed in laboratory like chemical resistance, short spray, resistance in continuance boiling water, abrasion resistance and impact resistance etc. these are conducted on every
batch of production.
6.
Handling & Stacking
Fusion Bonded Epoxy Coated Bars require padded contacts during
transportation, stacking, handling and till the concreting is done.
7.
Cutting, Bending & welding
The cut ends, welded spots and handling damagers are required to be repaired with special liquid epoxy compatible with the coating
material as per specification of the coating agency.
Fusion Bonded Epoxy Coated Rebars (FBEC)
-
EPOXY COATS THE REBAR IN THE FOLLOWING MANNER
-
Melts
-
Flows
-
Gels
-
Cures
-
Cools
-
Adheres as coating IS 13620: 1993
Table 1Mandrel Diameter for Bend Test Requirements (Clause 8.3)
Bar Diameter, mm
Mandrel Diameter, mm
(1)
p>(2) 6
60
8
80
10
100
12
100
16
125
18
150
20
150
22
200
25
200
28
225
32
280
36
280
40
400
45
450
50
500
VI. CONCLUSION
Due to the attack of chemical on Steel develop cracks which are the first sign of destruction. The damage due to corrosion is serious effects upon the mechanical properties of concrete structure. One the corrosion of reinforcement starts under the loaded structure. The stresses acting on it increase and the ultimate and finally the structure failed. The loss due to corrosion is very heavy. To produce the durable concrete and resist the harmful effect of aggressive environment. Most economical and better method to provide the anti corrosion resistance bars.
Epoxy coats rebar
S No.
Parameter
Requirement
1.
Surface
Bars are cleaned from
preparation
surface contamination
such as oil, grease etc. by
chemical process by shot
blasting.
2
Pre heating and
After the surface
surface
preparation bars are
preparation
heated by the induction
heater at temperature
between225-245°C.
3.
Fusion bonded
The steel is to be coated
epoxy coating
is passed through powder
stream on conveyor the
powder particle
uniformly wrapped
around surface
4.
Cooling and
The bars are cooled by
testing
passing through a water
tunnel and testing with a
holiday detection device.
4.
Continuity of
The adhesion of the
coating
coated bars is continuing
till the surface of bars is
fully coated. and it can be
checked by the bending
of the bar.
-
-
CORROSION RESISTANT STEEL DEFORMED REBAR (CRSD)
-
Resistance to corrosion can be made by the formation of initial layer of protective oxide or rust. (Hypo oxides). Unlike common rust on normal rebar the CRSD rust is passive, tenacious and self-renewing.
-
The protective oxide is fine textured, tightly adherent and act as a barrier to moisture, oxygen, carbon dioxide, sulphur dioxide and chloride effectively preventing further corrosion.
-
Reinforcing Bars with Improved Corrosion Resistance:
-
Stainless Steel Bars
-
Galvanized Steel Bars
-
Epoxy-Coated Reinforced Bars[5]
REFERENCES
-
http://www.sciencedirect.com/Study of the behavior of corroded steel bar and convenient method of repairing
-
http://www.engineeringcivil.com/
-
http://www.crsi.org/
-
Concrete Reinforcing Steel Institute
-
Durability of Concrete Structures, RDSO, India Guidelines for the use of High performance Concrete in Bridges, RDSO, India A775/A775M? 07b (Reapproved 2014) Standard Specification for Epoxy-Coated Steel Reinforcing Bars