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Civil Engineering Information

Comparison of Epoxy coated rebar vs CPCC rebar vs CRS rebar

Sourav Dutta
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.


Increase in cost of construction materials: A challenge to overcome

Sourav Dutta
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.


Safety / Stability of RCC structure during earthquake – A challenge to overcome

India has been plagued by some catastrophic earthquake tremors in past that have caused loss of property and human beings:

Date Location Effect Magnitude
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!

Toilet Flooring with Tile Spacers

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?


Rust / Corrosion of Reinforcement Bars – A challenge to overcome

Mr.Sourav Dutta
Manager (Civil)
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.

Fig  Guideline of BIS1786-2008
Fig : Guideline of BIS1786-2008