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Special Needs – Concrete Bridges

Effective and economical durability protection for concrete bridges?

Special Needs – Concrete Bridges
08 January 2019 Posted in , ,

IT’S COSTLY TO MAINTAIN A CONCRETE BRIDGE.

If you’re in charge of the care of a concrete bridge (or the related repair budget) you’ll be well aware they’re not a cheap item to maintain; to say nothing of the cost of replacement!
There’s two real-world factors that come into play here:
1) Bridge maintenance budgets are likely to be inadequate to cover the real costs involved.
2) Bridge service life estimates are rarely achieved without maintenance intervention along the way.
And do you know what? This shouldn’t be the case. Isn’t concrete naturally durable?
Adding life to concrete.

MOISTURE AND DETERIORATION

Did you know that premature deterioration of concrete is almost always the result of moisture-borne contamination?
Reactive substances enter the concrete and move about within it, carried by water and moisture vapour. These include chlorides and other substances that react with the concrete or the reinforcing steel, setting up a cycle of cracking and breakdown.
Think about it: structures in extremely dry conditions will tend to last a lot longer. Conversely, structures in moist conditions are under environmental pressures that lead to premature decay.
Adding life to concrete.
This at once places watercourse bridges, permanently subjected to a high-moisture environment, at particular risk.
Adding life to concrete.

PREVENTION … AND THE TROUBLE WITH CRACKS

All of this is probably not telling you anything you didn’t already know, really. And of course, a lot of research is constantly going into research for better mix designs and work practices which should make concrete structures more durable from the outset.
The tiny problem is, it’s virtually impossible to eliminate micro-cracking during construction – and micro-cracks are gateways for moisture – and moisture carries contamination.
Adding life to concrete.
Further, if the bridge you’re looking after has aged, and you’re already faced with cracking (and/or steel corrosion), then you need a cost-effective solution urgently.
You may be thinking of preventing further deterioration by means of a coating or silane. You may be planning on cementitious patching or other repairs. Unfortunately, none of these things will address or arrest the underlying problems.
Adding life to concrete.

ENTER HYDROGEL TREATMENTS

Aquron concrete hydrogel treatments are water-based nanoparticle catalytic silica colloids.
Yes, that’s quite a mouthful, but what do they really do?
Aquron treatments penetrate the porosity of the concrete, utilizing the free lime to form a hydrogel within the matrix.
Adding life to concrete.
Importantly, this hydrogel uses up and immobilizes the moisture within the concrete. This has two key effects:
1) Prevents moisture (… and those moisture-borne contaminants …) from entering the concrete.
2) Prevents the movement of moisture within the concrete – arresting the reactivity of the contaminants.
Adding life to concrete.
The practical results of this include

  • Arresting ASR (alkali silica reactivity)
  • Preventing DEF (delayed ettringite formation)
  • Arresting corrosion, and protecting the reinforcing zone
  • Sealing micro-cracks up to 0.5mm

Adding life to concrete.

Aquron protected

You can see where this is going. Yes, there is a cost-effective treatment for proactive maintenance of your concrete infrastructure.
Adding life to concrete.
IF INCLUDED IN NEW CONSTRUCTION – Aquron hydrogel treatments can enhance curing, minimize cracking, and protect the durability of the structure from the outset.
IF USED FOR REMEDIATION – Aquron hydrogel treatments can penetrate deep into the concrete, sealing against further contamination, and arresting existing reactivity.
Adding life to concrete.
If your damage is extensive (spalling or major cracking) then Aquron alone will not suffice, but can still be beneficial in preventing Incipient Anode Formation around cementitious repairs.
Adding life to concrete.

MAJOR COST SAVINGS OVER TIME

Proactive concrete maintenance, using Aquron hydrogel treatments, will significantly assist in reducing major repair costs. Intervene early with hydrogel treatments, to save major repair costs over time.
Adding life to concrete.
Want to know more? Get in touch!
Adding life to concrete.

… AND THERE’S MORE …

Hey – Aquron hydrogel treatments are environmentally friendly too. That’s important when you’re working over waterways, for example. Check out this case study.

Project brief Aquron 7000 used in sensitive environment Sunshine Coast Bridges




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