Reducing steel in water retaining concrete structures

Use Self-Healing Concrete to accept temporarily larger cracks and reduce up to 40% shrinkage reinforcement

The Study Case

Commissioned by the Port of Rotterdam, Basilisk Self-Healing Agent is used for a liquid containment concrete structure designed as a fire extinguishing tank. The walls are loaded with 5 meters of hydrostatic pressure, while only having a thickness of 350 mm. The structure is classified as water tightness class 1 in which the allowed leakage is limited.

Reinforcement & Crack width

In able to control the crack widths related to that limited leakage, usually a large amount of reinforcement is needed. When opting for Self-Healing concrete, we provide healing properties to concrete. This makes it possible to temporarily accept larger cracks, as they will be sealed watertight in a couple of weeks. The limit for these larger cracks are based on durability regulations and therefore the design still complies to regulations and standards. With this approach the steel needed for shrinkage reinforcement can be reduced significantly.

Less Steel, CO2 & Costs

Steel is one of the main causes of carbon emissions of a reinforced concrete structure. Reduction of reinforcement will not only have a positive impact on cost reduction, but will also reduce the CO2 footprint of the structure, contributing to a greener future.

Making concrete repair itself

With Basilisk Healing Agent, the ability for the concrete to heal itself is greatly improved. The bacteria in the Healing Agent are activated by water and start to produce limestone. This seals cracks and makes the structure watertight. This in turn makes the steel reinforcement much less susceptible to corrosion.

The study case

Commissioned by the Port of Rotterdam, Basilisk Self-Healing Agent is used for a liquid containment concrete structure designed for fire extinguishing water. The walls are loaded with 5 meters of hydrostatic pressure, while only having a thickness of 350 mm. The structure is classified under tightness class 1 in which the leakage has to be limited to a small amount.

Reinforcement & Crack width

In able to control the crackwidths to an amount that limits leakage to a certain extent, usually a huge amount of reinforcement has to be used. However, since the use of Basilisk Self-Healing Agent provides autonomous self-healing properties to the concrete, the cracks will seal watertight. This allows us to accept wider crackwidths, which results in a significant reduction of reinforcement..

Less Steel, CO2 & Costs

Steel is one of the main culprits in terms of CO2 emissions of a certain construction. Reducing of reinforcement will not only have a positive impact on the costs, but will also reduce the CO2 footprint of the structure, contributing to a greener future.

Making concrete repair itself

With Basilisk Healing Agent, the ability for the concrete to heal itself is greatly improved. The bacteria in the Healing Agent are activated by water and start to produce limestone. This seals cracks and makes the structure watertight. This in turn makes the steel reinforcement much less susceptible to corrosion.

Calculation input

An indication of the possible reduction of shrinkage reinforcement in this Case Study can be calculated using our tool. By entering a couple of project parameters, the difference in reinforcement and what this means for the saved CO2 emissions can be shown. In the 3 boxes on the right, some of the input parameters are shown, like the original design crack width and the increased crack width using Basilisk Self-Healing Agent.

Calculation input

An indication of the possible reduction of shrinkage reinforcement in this Case Study can be calculated using our tool. By entering a couple of project parameters, the difference in reinforcement and what this means for the saved CO2 emissions can be shown. In the 3 boxes below, some of the input parameters are shown, like the original design crack width and the increased crack width using Basilisk Self-Healing Agent.

Calculation output

The figure on the left shows the calculation results, which is the amount of shrinkage reinforcement needed for both input cases. Also the differences in kilograms steel as well as saved CO2-eq emissions according to the reduced steel amount.

40% of steel reduction was made possible due to Healing Agent

Calculation output

The figure above shows the calculation results, which is the amount of shrinkage reinforcement needed for both input cases. Also the differences in kilograms steel as well as saved CO2-eq emissions according to the reduced steel amount.

40% of steel reduction was made possible due to Healing Agent

Behind the tool

We applied a crack width formula based on the fundamental bond characteristics of reinforcing steel.

Curious about what you can save for your project? Contact us and one of our engineers will be happy to discuss the possible savings for your project.

 

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