Concrete mix design for concrete durability

[@nobreighner]

Excellent explanation of the basis for the standards, and making clear the motivations for improvements! Thank you.

[@mr.harvey6310]

What type of concrete was used in the flak towers in Germany that are still around today. Seems very good concrete mix. Taking lots of bombs and hits and difficult to demo after the war.

[@johnsimeone428]

With the understanding that the durability discussion contemplates larger scale, wide use concrete applications, do you have a view (or is there research on) the use of epoxy coatings and their effects on durability?

[@akoponen]

How about using deionized water when mixing concrete?

[@elbuggo]

This video has way too few views!

[@justinshook233]

Whats your thought on aggregate size in relation to durability of the mix? Specifically using 10mm instead of 20mm.

[@TylerLey]

Aggregate size does not change the durability of the mixture. However, you can sometimes need more paste (binder + water) in mixtures with lower aggregate sizes. More paste is bad for durability. I talk about this in my Tarantula Curve videos. Search KZbin Tarantula Curve to learn more.

[@anantdabholkar685]

I think you are wrong about prestressing steel corroding faster than rebar. This again has not been borne out by testing, but by guesswork. Go look at corrosion in a prestressed beam. The rebar is completely rusted while the prestressed strand has only surface rust. Look into this for actual research papers.

[@waqasferoz5054]

Hi