[salsa]

 

[salsa]

TTC second exit - progress update

 

[AlvinofDiaspar]

Great to see epoxy coated rebars being used.

AoD

 

[Armour]

Great to see epoxy coated rebars being used.

AoD

What's the difference?

 

[AlvinofDiaspar]

What's the difference?

The rebars are less susceptible to rusting from road salt runoffs - which means the structure will be more durable in the long run.

AoD

 

[BurlOak]

MTO stopped using epoxy coated (green) rebar about 10 years ago.

It was found that the epoxy coating degrades over time in the high alkalinity of concrete. This takes about 35 to 40 years. Coincidentally, it takes the chloride from road salt about 35 or 40 years to reach the rebar level for common concrete cover values (70mm).

Thus, just when the epoxy coating is needed, it fails.

MTO tightened the specs on concrete, making it more impervious to chloride impress. Concrete surfaces in direct contact with salt water are waterproofed, and sometimes sealed. In select locations, premium reinforcement is used. Either stainless steel, semi stainless steel (MMFX)(coming soon), or Glass Fibre Reinforced Polymer (GFRP) reinforcement.

 

[AlvinofDiaspar]

MTO stopped using epoxy coated (green) rebar about 10 years ago.

It was found that the epoxy coating degrades over time in the high alkalinity of concrete. This takes about 35 to 40 years. Coincidentally, it takes the chloride from road salt about 35 or 40 years to reach the rebar level for common concrete cover values (70mm).

Thus, just when the epoxy coating is needed, it fails.

MTO tightened the specs on concrete, making it more impervious to chloride impress. Concrete surfaces in direct contact with salt water are waterproofed, and sometimes sealed. In select locations, premium reinforcement is used. Either stainless steel, semi stainless steel (MMFX)(coming soon), or Glass Fibre Reinforced Polymer (GFRP) reinforcement.

It will be interesting to see how the this applies to a non-highway setting.

AoD

 

[Edward Skira]

From this morning.

 

[dragontea]

Pics as of today April 27th, 2016

 

[uwphysmed]

May 18, 2016 - drilling for earth anchors continues after they replaced the original unit on site...

 

[SunnyWorld]

Nice pictures. It is delayed? Do we know when it will be completed?

 

[Ramako]

Nice pictures. It is delayed? Do we know when it will be completed?

What makes you think it's delayed?

 

[SunnyWorld]

I am not sure - I could be mistaken- I thought it will be completed by end of this year or early next year, but seems they just did the foundation?

 

[salsa]

 

[barit]

MTO stopped using epoxy coated (green) rebar about 10 years ago.

It was found that the epoxy coating degrades over time in the high alkalinity of concrete. This takes about 35 to 40 years. Coincidentally, it takes the chloride from road salt about 35 or 40 years to reach the rebar level for common concrete cover values (70mm).

Thus, just when the epoxy coating is needed, it fails.

MTO tightened the specs on concrete, making it more impervious to chloride impress. Concrete surfaces in direct contact with salt water are waterproofed, and sometimes sealed. In select locations, premium reinforcement is used. Either stainless steel, semi stainless steel (MMFX)(coming soon), or Glass Fibre Reinforced Polymer (GFRP) reinforcement.

Thanks for the clarification. Since you obviously know quite a bit about rebar, can you answer a question? When the concrete in a form with rebar in it has hardened enough for the next pour, say for a column, is there a naturally weak spot between the dry and the new concrete?