Ion Exchange India Limited
Now-a-days for controlling rust/corrosion of rebar some extra treatment is being carried out on rebar, making it more resistant to rusting/corrosion under unfavorable circumstances. Some of these treated rebars normally used are: (1) Fusion bonded epoxy coated rebar, (2) Cement-polymer composite coated rebar,(3) Corrosion resistant steel (CRS) rebar. The following comparison is being made aiming to give a clear cut idea on advantages/disadvantages of each type, which might help and give an idea to construction industry for decision making of selection of any particular type.
Ion Exchange India Limited
Construction industry at present is facing a major hike in material price, especially cement, sand and stone chips. The following document is prepared to highlight the reduction in concrete manufacturing cost upon using Fly Ash (BIS3812). The method of mix design has been done in reference with BIS10262-2009. Hope that any contractor over India will benefit from the given working and follow the suggested method to reduce their construction cost.
This will have the following advantages: (1) Reduction in use of construction materials which are facing scarcity now-a-days, (2) Reduction of construction cost for contractor, (3) Use of fly ash in a effective manner, which are generated as waste product from thermal power plants and various industrial plants, (4) Assisting in scientific disposal of waste product from thermal power plants and various industrial plants.
India has been plagued by some catastrophic earthquake tremors in past that have caused loss of property and human beings:
|January 3, 2016||North East India||11 dead, 200 injured||6.7|
|May 12, 2015||Northern India, North East India, Bihar West Bengal (Epicenter at Nepal)||218 (44 killed in India)||7.3|
|April 25, 2015||Northern India, North East India, Gujarat (Epicenter at Nepal)||8,900+||7.8|
|September 18, 2011||North East India, Gangtok, tremors felt in Delhi, Kolkata, Lucknow and Jaipur||118||6.9|
|October 8, 2005||Kashmir||1,30,000||7.6|
|December 26, 2004||Third deadliest earthquake in the history of the world, the tsunami generated off west coast northern Sumatra, India, Sri Lanka, Maldives||283106 (15000 killed in India)||9.1|
|January 26, 2001||Gujarat||20,000||7.6/7.7|
However, during the earthquake in New Zealand on 3rd September 2010 (magnitude on Richter’s scale: 7.0), only 2 people were injuredwhich was caused by falling masonry and glass. Interestingly, the said earthquake had struck when most people were asleep. Therefore it is clear that “EARTHQUAKES DON’T KILL PEOPLE, BUILDINGS DO!”
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It was observed from our many of the project sites that the flooring tiles used in toilets are of joint free type. It was reported by from the handed over flats of deferent projects that toilet floor has the major problem of leakage.
While going through the issue it was found that the joint free tiles that we are using in the floor are the reason for the leakage. Since the joint between the tiles are too small, it difficult to seal the joint completely, this leads to the penetration of water through the joint and resulting in leakage. Also these joints does not account for the expansion and contraction due to temperature by tiles, it will result in the failure of tiles.
Hence as a corrective action for this issue we suggest for the usage of the Tile spacers during the tile lying in toilet floors.
Why use tile spacers?
Tata Steel Ltd
Rusting/Corrosion are mainly caused due to:
1. Prolonged exposure of rebar to atmosphere/rainfall without any precaution.
2. Aggressive/saline/toxic environment.
RUST is caused by the reaction of air (O2) and moisture (H2O), and it is a common and natural phenomenon for most steel products. IT SHALL NEVER BE CAUSE OF CONCERN/REJECTION OF REBAR, AS PER BIS.