Corrosion with rusting of reinforcement in concrete comprises two stages. In a first stage (or step), the Corrosion aggressive elements, such as chloride or carbon dioxide (CO2) (Cl-), present in the surrounding medium, penetrate in concrete. This is the initiation stage. The second stage is propagation which starts, when these aggressive bodies are in rather high concentrations at the reinforcement level. This corresponds to the rust growth, which can break concrete cover. These stages are described as follows. - a first stage involves the transfers of aggressive agents (mainly carbon dioxide and chloride) of water and of oxygen, inducing the Corrosion Corrosion initiation (depassivation of reinforcement), - a stage of Corrosion Corrosion growth, growth, leading to concrete damage, to spalling, cracks, etc. This stage starts when the contents of aggressive agents are high enough closed to reinforcing steel. So, to describe steel Corrosion Corrosion in concrete, it is advisable to define, on the one hand, the penetration of the aggressive agents through concrete and, on the other hand, the conditions of depassivation of reinforcement, then the dissolution rate of metal and the rust growth.
Stages of corrosion with rusting (1) initiation (2) propagation starting from date (d) (3) concrete cracking
Stade (1) initiation
Stade (2) propagation
Stade (3) cracking
No visible damage
Damage hardly detected
Damage visible on concrete surface
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Corrosion Is No Match For Conlife / The Product history In certain situations, it is possible ofr concrete structures to stand up well for years. The preparation of concrete will be made with water sources like bore, canal, river or well etc. Which contains chlorides, sulfates, other harmful chemicals.. But in normal environments, embedded steel corrosion is a fact of life in bridges,highways, buildings and harbors, unless special precautions are taken to control the corrosion to steel in concrete. Exposure to chlorides,such as deicing agents and the water and the more Ph value of cement, can cause rapid and severe corrosion of rebar in concrete. The volume of rust created in this process is several times greater than the steel it displaces. The destructive result of this expansion is concrete deterioration cracking, spalling, and surface delaminations - that can seriously compromise riding surface quality, structural integrity and safety. When used as a preventative during initial construction, with Conlife concrete admixtures and migratory corrosion inhibitors Resists the onset of corrosion. When corrosion develops in existing structure, Conlife inhibitors can be applied to reduse further deterioration and fortify the concrete against additional damage. Conlife protects your investment at one time and costs of rehabilitation projects. How Conlife Product Works Conlife product will formulate with a unique combination of corrosion-
inhibiting chemicals to protect the steel in concrete while preparing the cement concrete mix. The crack formation in concrete structure occurs due to the corrosion of rebar inside the concrete. This occurs because of the surface oxidation of iron rod into iron oxide due to diffused oxygen and moisture in the concrete. The places where the chloride content in the ground water is more, carbonation reaction occurs which leads to the decrease in alkalinity. Because of this, the rate of corrosion of steel rebar increases and eventually the cracks are formed. By adding the Conlife admixture to the concrete mix, the corrosion of steel rebar can be prevented.
Reinforcing Steel With Conlife
Reinforcing Steel Without Conlife
Function of Conlife When Conlife approaches the steel rebar surface, it forms a protective layer which prevents the corrosion of iron rebar in the concrete by moisture and other ions such as chloride. Conlife product is an effective alternative and economically cheaper to eproxy coated rebar, modified concretes, and concrete surface coatings. Product Acceptability The Conlife is testd by APERL (Andhra Pradesh Engineering Reasearch Laboratory) which is working under Irrigation Department Govt of A.P. The test report gives Conlife is having higher corrosion resistant properties and increases bonding between the concrete and steel rebars. The product utilized by Panchayath Raj Department of its R.W.S works and send a copy of remarks that Conlife is working well for corrosion resistance to the steel in reinforcement. AP State housing corporation Ltd, utilized the product for Nirmithikendra Products and ceritifed that Conlife is a good corrosion resistant admixture without side effects to the concrete.
Function of Conlife Conlife a anticorrosion admixture is manufactured by M/s Clean
Tech Corrosion Chemicals, Hyderabad. The product being marketed through M/s. Clean Tech Corrosion Chemicals (Formerly known as Clean Tech Water Filters) by its proprietor Mr.M.Venkat Krishna ofSteel rebar in chloride Steel rebar in chloride solution solution Hyderabad since 2004. with Conlife
without Conlife
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Carbonation : Effects of chlorides in concrete
1. Conversion Iron Bars into Iron chloride. 2. Electro chemical process. 3. Concrete cell. 4. Concrete-Eletrolyte 5. Part of steel rebar-Anode & cathode.
DEMO
How to know the performance & nessasity in the field about the product. (Demo kit will be provided by the company on written request.)
The demonstration kit contains. H.D.P.E containers –2no’s 6mm/ 8mm/ 10mm Iron rods –2no’s (or get from your construction site) Conlife Chemical –1 sample bottle (5ml) How to observe the performance of the product. STEP-1
Take two HDPE containers and wash properly with plain water. STEP-2
Fill both the containers up to 80-90% with water used for construction. (Site water) bore water/ municipal water. STEP-3
Pore the sampleConlife in one of the containers (second container only water without Conlife) STEP-4
Immerse a steel/iron rod in each containers, tighten the caps of both of them keep in a separate place for a weeks time. STEP-5
Observe the difference of the iron rods immersed in both containers. There will be no corrosion in the rod immersed in the Conlife container. The second iron rod which is immersed in plain water can be affected with corrosion *(a slight reddish layer will be appearing on the surface of the iron rod), The observation shows that even if we use plain water for R.C.C (concrete), **The corrosion will takes pl ace Result * It shows the need for Conlife for your construction. ** The result varies from site to site depending on the site conditions. Note:
You can use the iron rods of same size being used your construction. Advantages of the product Conlife controlling corrosion which enchances the life of the building/ structure with a 2% of the building c ost).
nominal cost (less than
Prevents the cracks of the structure which causes leakages. Gives more strength to the building which can with stand from earth quakes and natural
calamites.
Easy to mix Non-toxic No maintenance or repairs required for longer period No technical support is required when adding to the concrete. Easily it can be mix with
concrete.
Easy to use Non-skill dependent, just mix non-toxic, low viscosity, water based liquid additive right into the concrete mix. No maintenance requirements. Note :Result may vary from site to site according to site & water conditions. Where it can be used for Buildings
OHSRS
CPW Schemes
Dams/ irrigation projects
RCC Pipes
Bridges
Cement windows, doors etc.
Concrete pipes
Marine Structure
All R.C.C Structures
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