Mr.Hussam,

Yes i feel due to the rust you have an the reduction in bond performance..to control rusting the geosynthetic based reinforcement can be provided and have a corresponding increase in bond performance..ok all the best in your research....

Thanks Karthigeyan . S ......... Thanks so much... you are right..

But did that will depends on the types of bar reinforcement ....?

yes it depends on the type of geosynthetic and its tensile strength..

Karthigeyan . S .... What about the type of bar reinforcement ... ( plain round bars .. or.. deform bar...) does that effect..?

goesynthetic material is a fibre ..polymer based material..poly vinyl chloride material..

Dear Hussam,

slightly rusted bars may be preferred since improvement in bond with concrete is observed due to rough surface.

Highly rusted bars may not suitable because reduction in bar diameter takes place due to pitting type corrosion. Corrosion reduces load carrying capacity of bar. Highly rusted bars provide weak thin layer of iron oxide which seriously affect bond with concrete. This layer should be removed by scraping and then clean bar should be coated with suitable polymer based material.

Thanks Ishwar Sonar .. for your answer..

Thanks Karthigeyan . S .. for your answer..

Did plain round bars .. effected more than.. deform bar or less..?

Rust on rebar can increase bond strength especially where pitting has occurred on the rebar. If rusted rebar is to be used, they should be cleaned from loosened rust and then placed in the formwork.

Dear Hussam,

Find attached the handbook on geosynthetic..this will be useful to all your questions..all the best in your research..

Dear Karthigeyan . S ... thanks so much for answering...

Mr.Hussam,

Your question is different than what i answered to you..sorry actually i tried to give answer for reinforcement used to strengthen the road..anyhow, i hope this also useful to you..

Dear Hussam,

I feel the presence of rust have adverse effect on the performance of the bond is true, yes it affect the overall performance of the bond. Rusting is the phenomenon related to corrosion because of it the bond strength is going to get reduced.. so we need to avoid rusting kind of problem in reinforcement..