Arrest those cracks


17 April 2018

Markham Global: Arresting The Cracking Cycle ... And The Deterioration That Goes With It

“Concrete Structures Are Deteriorating At A Much Faster Rate Than Expected, Resulting In A Massive Need For Repairs And Premature Replacement That Costs Billions Of Dollars Annually.”

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If You Are In Charge Of Concrete Structure Maintenance – Particularly If You Are Required To Administer A Limited Budget – These Words Will Ring True For You. It’S All Too Common For Concrete Infrastructure To Show Signs Of Deterioration Well Before Its Planned Service Life.

The Six Causes Of Cracking

There Are 6 Underlying Causes Of Cracking. Actually It’S Not Quite That Simple, As More Than One Cause Can Be Present In A Structure Simultaneously. But These Are The Basics:

Lately, Of Course, There Has Been Increased Focus On The Various Impacts Of Climate Change. It’S Not Our Intention To Ignore This Discussion But We Believe The Various Effects Fall Under The Same Basics As Seen In The Past – Except Accelerated Or Aggravated.

Reference 2

The Deterioration Cycle

Minor Cracking In Itself Isn’T Enough To Bring A Structure Down. There Would Be Few Concrete Structures Or Slabs That Don’T Exhibit Some Form Of Micro-Cracking Or Worse.

The Concern Is The Way Cracks Contribute To Longer-Term Deterioration. Cracks Are Gateways Into The Concrete, For Reactive Contaminants – Carried By Moisture And Moisture Vapour.

For Example, Moisture-Borne Chlorides Can Enter The Concrete Via Shrinkage Cracks, And Penetrate To The Reinforcing Zone. The Chlorides Then Break Down The Natural Passivity Of The Concrete, Setting Up Corrosion Of The Steel. At Once, Instead Of One Cause Of Cracking, You Have Three – The Original Shrinkage; The Chemical Reaction Of The Chlorides; And The Expansion Of The Corroding Steel.

Small Cracks Lead To Larger Cracks. Larger Cracks Lead To Delamination And Spalling. You Can See Where This Is Heading. Next Stage Is You Are Assessing The Repair Or Replacement Cost Of The Structure.

Act Early!

It Is Not Intelligent To Conduct A ‘Reactive’ Maintenance Program – Acting Only When Deterioration Is Evident. This Is An Expensive Approach, And Its Effectiveness Can Be Debatable.

Reference 3

Weigh Up Your Overall Costs, And Consider The Benefits Of Being ‘Pro-Active’ With Your Maintenance Program. If You Could Apply A Treatment Early In The Life Of The Structure, Which Would Guarantee Or Even Extend The Planned Service Life, You Are Effectively Saving Costs. (Remember The ‘Rule Of Fives’?)

An Advanced, Effective Treatment

Just Now We Commented That The racks Are Gateways For Moisture-Borne Contaminants. The Movement Of Moisture Is The Key. Concrete In Truly Dry Atmospheres, Such As Central Australia, Does Not Deteriorate Anything Like As Quickly As Coastal Concrete. But New Zealand Is An Island Country! Moisture-Borne Contamination Is An Unavoidable Factor.

So We Need To Immobilise The Moisture. Prevent The Entrance Of The Contaminants. Prevent Their Movement And Action Within The Porosity Of The Concrete.

This Can Be Done! Aquron Treatment Penetrates Deep Into The Concrete, Converting Free Limes And Existing Moisture Into A Hydrogel Within The Porosity Of The Concrete. It’S Not Easy To Believe Such A Simple And Cost-Effective Treatment Can Provide So Many Benefits And Such A High Degree Of Long-Term Protection.

Get In Touch With Us For Case Studies, Test Results, And Project Referrals.

Other Benefits Of Aquron





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