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Marine Concrete Structures

... and steel corrosion

Marine Concrete Structures

Concrete marine structures are at extremely high risk of steel reinforcement corrosion

In Australasia, a high proportion of the population live close to the coastline. And a large number of concrete structures exist in that same zone. The closer to the coast, the higher the ambient humidity and the greater the risk of corrosion to the concrete’s reinforcing steel – and the resulting concrete decay.
Markham saving the world one concrete structure at a time
(Did you just stop reading because you live inland? Bridges over regularly flowing rivers and creeks are also at risk!)
When saltwater is involved – including tidal rivers – the risks escalate due to the high chloride content of that water.
Markham saving the world one concrete structure at a time

Deteriorating marine concrete

The common factor is the moisture level.

Moisture and moisture vapour carry contaminants into the porosity of the concrete. Microcracking, due to ASR or other factors, encourages this process.
Markham saving the world one concrete structure at a time
When contaminants, particularly chlorides, reach the rebar zone, accompanied by moisture, the steel is at high risk of corrosion.
This whole process of concrete decay is gradual and can be manifested as major cracking, corrosion stains, or spalling.
Markham saving the world one concrete structure at a time
The question is, can the process be arrested?
Like most decay processes, the earlier it is treated the better the outcomes. Major degradation may require engineered repair work including possible replacement of the steel and associated costs and downtime.
Markham saving the world one concrete structure at a time
Ideally, the concrete’s porosity and microcracking should be sealed at the earliest possible stage – even while under construction, but definitely at the first appearance of microcracking.

Markham offers an advanced penetrating hydrogel treatment, which has proved its worth throughout Australasia in protecting concrete and slowing the aging process.
Markham saving the world one concrete structure at a time
The hydrogel seals the porosity, and cracks up to 0.5 mm in width, and penetrates to a depth of up to 150mm. Moisture content, moisture vapour, and moisture-borne contaminants are immobilised. The risk of reactivity is significantly reduced.
Markham’s hydrogel treatments can be applied to both new and existing concrete.
Markham saving the world one concrete structure at a time
If you have the care of a concrete marine structure, we’re keen to talk to you about its preservation and proactive maintenance.
Markham saving the world one concrete structure at a time
Get in touch today!

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