The Insight: Concrete Condition - Cracked versus Non-Cracked Concrete

The Insight: Concrete Condition - Cracked versus Non-Cracked Concrete

Here at ICCONS, we are often asked “I can’t see any cracks in the concrete, do I need to assume a Cracked Concrete condition when designing my concrete anchors”. Under AS5216:2021, the conservative answer is always yes, unless proven otherwise.

Concrete as a material is characterized by its compressive strength and demonstrates huge capacity when in compression. The same cannot be said in tension where steel reinforcement is required to minimize concrete cracking. Reinforced Concrete is therefore a composite material where the concrete is designed to be loaded in compression and the reinforcement loaded in tension. Knowledge of these basic principles is essential in understanding concrete compression and tension zones. 

Definition of cracked concrete: In general terms, ‘cracked concrete’ refers to concrete that is likely to experience cracking during its design life. These cracks may result from the action of forces on the concrete or earlier due to the concrete shrinkage in the setting process. 

It is also important to note that for seismic design, the concrete should be assumed to be cracked unless a comprehensive analysis demonstrates the concrete remains non-cracked throughout the seismic event.

In summary, incorrect determination of the concrete condition in which the fastener is to be installed may prevent safety-critical fasteners from functioning correctly leading to catastrophic outcomes. AS5216:2021 conservatively assumes all concrete is Cracked unless justified by Stress Analysis. For further information, please refer to AS5216:2021 available here:

ICCONS has a wide range of Concrete anchors suitable for use in cracked concrete, that includes but is not limited to screwbolts, thru-bolts, drop-ins, cast-in inserts, and chemical anchors.

Should you require anymore information – please don’t hesitate to get in touch with our technical experts via or alternatively call us on 03 9706 4344. 

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Customer Testimonials

“As a professional engineer with over 10 years industry experience, I have been recommending the use of ICCONS products since first learning of them back in 2017. What makes ICCONS products great is their technical design specifications. The engineering team at ICCONS has gone above and beyond to develop easy to read product manuals, which makes specifying the right product for the job very straight forward. They have also developed free design software for peace of mind. I rest easy knowing ICCONS regularly put their products to the test and perform.   If you’re an engineer, whether it be as a designer or hands on in the field, you will find the detail and ease of use of ICCONS a breath of fresh air. The information is easy to find, easy to use and complies to Australian Standards.”

Steven, Raw Worx
Customer testimonial

“We really loved the Structnail Gripshank Supersharpy as we saved a lot of time compared to the traditional way of screwing the boards on, but the biggest time saving comes from the head of the nail - it doesn’t buff up the board like a screw does, so the finished product looks so much better and basically no sanding and patching before painting compared to screwing it. The finished product looks amazing and we are really happy with it.”

Michael, Cardo Constructions
Customer testimonial

“We purchased the B+BTec core drilling equipment for a large job at Crown Casino and were very impressed with the performance of this product and the auto-feed unit was a dream. The speed at which the B+BTec core barrels cut through steel reinforcement was amazing. The team at ICCONS were fantastic to deal with in assisting with any roadblocks that we encountered with the job.”

Anthony, MG Group
Customer testimonial

“Very happy with the performance of the ICCONS Pure Epoxy chemical. It met all of the requirements at a fraction of the cost for another brand. The ICCONS team were helpful in the selection of products to be used for the application. We purchased the B+BTec core drill for this job as it was highly recommended, and after a few weeks of use, we purchased another tool as it was heavily reducing labour costs.”

Richard, Blue Steel Welding
Customer testimonial

“The ICCONS engineering support, site load testing and ease of purchasing their product range through local distribution is a whole package of support that suits our business perfectly.”

Greg, Robert Guy and Sons
Customer testimonial

“We use a full fleet of ICCONS GT-6 Gas Tools extensively every day and we cannot fault the product, service or quality that ICCONS provides. We highly recommend them!”

John, Advanced Pest Control
Customer testimonial

“I am learning every day in my job here at Fitzgerald’s. It was great to see the ICCONS team come into the fold here on site. They went about their work professionally and swiftly attaining the answers we needed to get on with the job.”

Jane, Fitzgerald Constructions
Customer testimonial

“The team at ICCONS had an answer for all our questions, and if they were not sure, there was no stress in doing what they could to track down the right information. They were a breeze to work with and I couldn't believe that we had the whole testing process done and reports handed over within the week. That’s unheard of in this game.”

David, Hutchinson Builders
Customer testimonial

“I must make a special mention to the engineering team at ICCONS, they were unbelievably professional in their approach and absolutely proficient in their knowledge. The BIS–HY is an incredible new platform and a market leading product. Great work!”

Daniel, Hutchinson Builders
Customer testimonial

“We have used the ICCONS product on many a Starter Bar and Cross Stitching Project and always recommend them to the Designer and Builder as our preferred product.”

Lee, Robert Guy and Sons
Customer testimonial

“We will continue to work closely with ICCONS as their engineering and technical department are incredibly easy to deal with, they are also able to manage their tasks without us needing to follow up.”

Rory, Fitzgerald Constructions
Customer testimonial