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report:soa [2026/06/13 13:57] – [2.5.1. Structural Materials] team4report:soa [2026/06/14 23:22] (current) – [2.5.1. Structural Materials] team4
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 **Reef Design Lab** **Reef Design Lab**
  
-Reef Design Lab is an Australian design and fabrication company that develops artificial reef and marine habitat solutions. The company describes its work as the design, prototyping, and manufacturing of coastal solutions, with a focus on improving ecological performance in artificial reefs and coastal habitat infrastructure [(REEFDESIGNLAB2026)].+Reef Design Lab is an Australian design and fabrication company that develops artificial reef and marine habitat solutions. The company describes its work as the design, prototyping, and manufacturing of coastal solutions, with a focus on improving ecological performance in artificial reefs and coastal habitat infrastructure [(ReefDesignLab)].
  
-One of its well-known systems is MARS, which stands for Modular Artificial Reef Structure. MARS is a ceramic 3D-printed modular system designed to construct reef habitat without the need for heavy-duty equipment. The system can be deployed from small boats and assembled by divers, making it suitable for reef restoration projects in locations where large marine construction equipment may be difficult to use [(MARS2026)].+One of its well-known systems is MARS, which stands for Modular Artificial Reef Structure. MARS is a ceramic 3D-printed modular system designed to construct reef habitat without the need for heavy-duty equipment. The system can be deployed from small boats and assembled by divers, making it suitable for reef restoration projects in locations where large marine construction equipment may be difficult to use [(ReefDesignLabMARS)].
  
 Figure {{ref>fig:ReefDesignLab}} shows Reef Design Lab’s MARS system. The image helps illustrate how a modular reef structure can create habitat complexity while still being based on repeated units. Figure {{ref>fig:ReefDesignLab}} shows Reef Design Lab’s MARS system. The image helps illustrate how a modular reef structure can create habitat complexity while still being based on repeated units.
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 <WRAP> <WRAP>
 <table tab:summary> <table tab:summary>
-<caption> Comparative table for materials evaluated </caption> +<caption>Comparative table for materials evaluated</caption> 
-| **Material** | **Primary Requirement Met** | **Pros** | **Cons** |  **Estimated Price / m<sup>3</sup>** | +^ **Material** ^ **Primary Requirement Met** ^ **Pros** ^ **Cons** ^ **Estimated Price / m<sup>3</sup>** ^ 
-| **Bacterial HSC** | Longevity/Pressure | Autonomous repair; 96 % watertight | High complexity |  180–260 € | +| **Bacterial HSC** | Longevity / pressure resistance | Autonomous repair; 96 % watertight | High complexity | 180–260 € | 
-| **Basalt Reinforcement** | Corrosion Resistance | Non-corrosive; volcanic origin | Lower flexural peak |  160–220 € | +| **Basalt Reinforcement** | Corrosion resistance | Non-corrosive; volcanic origin | Lower flexural peak | 160–220 € | 
-| **Geopolymer Gel Concrete** | Low carbon / Chemical resistance | Lower CO<sub>2</sub>; chloride and sulfate resistance | Higher production cost | 150–200 € | +| **Geopolymer Gel Concrete** | Low carbon and chemical resistance | Lower CO<sub>2</sub>; chloride and sulfate resistance | Higher production cost | 150–200 € | 
-| **ECOncrete®** | Marine-life Friendly | Neutral pH; bioprotection | Specific mix needs |  140–180 € | +| **ECOncrete®** | Marine-life friendly | Neutral pH; bioprotection | Specific mix needs | 140–180 € | 
-| **Recycled Glass** | Sustainability | Increased chemical resistance | Strength loss > 30 % |  90–140 € | +| **Recycled Glass** | Sustainability | Increased chemical resistance | Strength loss above 30 % | 90–140 € | 
-| **Biorock** | Life Promotion | 4:1 growth; self-repairing  | Power dependent |  120–160 €|+| **Biorock** | Life promotion | 4:1 growth; self-repairing | Power dependent | 120–160 € |
 </table> </table>
 </WRAP> </WRAP>
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 == 2.5.1.2 Materials for Prototype vs. Final == == 2.5.1.2 Materials for Prototype vs. Final ==
  
-The final Maris Habitats product and the prototype have different material requirements because they have different purposes. The final product is intended for long-term underwater deployment, while the prototype is mainly used to validate the Reef Module shape, assembly process, Smartlogger attachment, and basic structural concept under controlled conditions.+The final Maris Habitats product and the prototype have different material requirements because they have different purposes. The final product is intended for long-term underwater deployment, while the prototype is mainly used to validate the Reef Block shape, assembly process, Smartlogger attachment, and basic structural concept under controlled conditions.
  
-For the final product, basalt fiber-reinforced concrete was selected as the intended material for the Reef Modules. This material was chosen because the final modules must remain stable on the seabed and resist long-term marine exposure, including saltwater, currents, wave action, and material degradation. Basalt fiber-based materials are suitable for marine applications because they offer mechanical performance and resistance to chemical and environmental degradation [(BasaltFiberMarine2025)]. Concrete structures in marine environments must also be designed carefully because seawater exposure, chloride and sulfate attack, corrosion processes, and wave action can cause deterioration over time [(QU2021)].+For the final product, basalt fiber-reinforced concrete was selected as the intended material for the Reef Blocks. This material was chosen because the final Reef Blocks must remain stable on the seabed and resist long-term marine exposure, including saltwater, currents, wave action, and material degradation. Basalt fiber-based materials are suitable for marine applications because they offer mechanical performance and resistance to chemical and environmental degradation [(BasaltFiberMarine2025)]. Concrete structures in marine environments must also be designed carefully because seawater exposure, chloride and sulfate attack, corrosion processes, and wave action can cause deterioration over time [(QU2021)].
  
-For the prototype, the material selection was based on practicality, cost, availability, and ease of production. The prototype does not need to prove full marine durability because it is not intended for real underwater deployment. Instead, it should help the team check whether the Reef Module shape, Smartlogger position, Smartlogger attachment, assembly logic, and general handling are suitable.+For the prototype, the material selection was based on practicality, cost, availability, and ease of production. The prototype does not need to prove full marine durability because it is not intended for real underwater deployment. Instead, it should help the team check whether the Reef Block shape, Smartlogger position, Smartlogger attachment, assembly logic, and general handling are suitable.
  
 During the prototype planning stage, three material options were considered: During the prototype planning stage, three material options were considered:
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 **Option 1: Polymer clay model** **Option 1: Polymer clay model**
  
-Polymer clay was considered during the early design stage because it can be shaped by hand and hardened in an oven. This makes it useful for quick form exploration when the team needs to test different shapes before deciding on the final Reef Module geometry. Polymer clay remains soft until it is baked, and baking is used to cure the material so that the shape becomes hard [(SculpeyBaking)]. It can also be stretched, cut, rolled, molded, stacked, and sculpted before baking, which makes it practical for small visual models and early design tests [(SculpeyOvenBakeClay)].+Polymer clay was considered during the early design stage because it can be shaped by hand and hardened in an oven. This makes it useful for quick form exploration when the team needs to test different shapes before deciding on the final Reef Block geometry. Polymer clay remains soft until it is baked, and baking is used to cure the material so that the shape becomes hard [(SculpeyBaking)]. It can also be stretched, cut, rolled, molded, stacked, and sculpted before baking, which makes it practical for small visual models and early design tests [(SculpeyOvenBakeClay)].
  
-However, polymer clay was not selected as the main prototype material because it is very different from the final concrete-based product. It cannot represent the real weight, concrete surface texture, porosity, or handling of the final Reef Module. It is also limited by oven size and is not suitable for validating structural performance, Smartlogger attachment, seabed stability, or long-term marine durability.+However, polymer clay was not selected as the main prototype material because it is very different from the final concrete-based product. It cannot represent the real weight, concrete surface texture, porosity, or handling of the final Reef Block. It is also limited by oven size and is not suitable for validating structural performance, Smartlogger attachment, seabed stability, or long-term marine durability.
  
 * **Pros:** Easy to shape, easy to modify before baking, low cost, and useful for early form exploration. * **Pros:** Easy to shape, easy to modify before baking, low cost, and useful for early form exploration.
-* **Cons:** Very different from the final concrete-based material, limited by oven size, does not represent real Reef Module weight, texture, porosity, or handling, and is not suitable for technical validation. +* **Cons:** Very different from the final concrete-based material, limited by oven size, does not represent real Reef Block weight, texture, porosity, or handling, and is not suitable for technical validation.
- +
- +
  
 **Option 2: Cement-based prototype cast with a 3D-printed mold** **Option 2: Cement-based prototype cast with a 3D-printed mold**
  
-A cement-based prototype is closer to the final concrete-based product because it can better represent the general appearance, surface texture, weight, and handling of the Reef Module. Concrete is widely used for artificial reef construction and can be used to create complex shapes for marine habitat structures [(ArtificialReefPreparation2026)]. In this approach, PLA filament is used to produce a 3D-printed mold, and cement is poured into the mold and left to cure. Therefore, PLA is not used as the final material of the Reef Module prototype, but as a tooling material for shaping the cement-based model. PLA is suitable for this purpose because it is commonly used for rapid prototyping and can also be used for mold inserts or casting-related applications [(PrusaPLA)][(UltiMakerPLA)].+A cement-based prototype is closer to the final concrete-based product because it can better represent the general appearance, surface texture, weight, and handling of the Reef Block. Concrete is widely used for artificial reef construction and can be used to create complex shapes for marine habitat structures [(ArtificialReefPreparation2026)]. In this approach, PLA filament is used to produce a 3D-printed mold, and cement is poured into the mold and left to cure. Therefore, PLA is not used as the final material of the Reef Block prototype, but as a tooling material for shaping the cement-based model. PLA is suitable for this purpose because it is commonly used for rapid prototyping and can also be used for mold inserts or casting-related applications [(PrusaPLA)], [(UltiMakerPLA)].
  
-This option allows the team to combine the geometric accuracy of 3D printing with the more realistic material behavior of a cement-based prototype. It is also low-cost and possible to produce locally. However, the prototype is not intended for real underwater deployment, and normal cement does not fully represent the final basalt fiber-reinforced concrete. Therefore, this option can be used to check the general shape, handling, assembly, and Smartlogger attachment, but it cannot prove long-term durability or full structural performance in marine conditions. For the final product, basalt fiber-reinforced concrete would still be required because it is more suitable for long-term marine exposure and resistance to chemical and environmental degradation [(BasaltFiberMarine2025)][(QU2021)].+This option allows the team to combine the geometric accuracy of 3D printing with the more realistic material behavior of a cement-based prototype. It is also low-cost and possible to produce locally. However, the prototype is not intended for real underwater deployment, and normal cement does not fully represent the final basalt fiber-reinforced concrete. Therefore, this option can be used to check the general shape, handling, assembly, and Smartlogger attachment, but it cannot prove long-term durability or full structural performance in marine conditions. For the final product, basalt fiber-reinforced concrete would still be required because it is more suitable for long-term marine exposure and resistance to chemical and environmental degradation [(BasaltFiberMarine2025)], [(QU2021)].
  
 * **Pros:** Similar appearance to the final material, more realistic weight and texture, accurate geometry from the 3D-printed mold, low cost, and suitable for checking general shape, handling, assembly, and Smartlogger attachment. * **Pros:** Similar appearance to the final material, more realistic weight and texture, accurate geometry from the 3D-printed mold, low cost, and suitable for checking general shape, handling, assembly, and Smartlogger attachment.
 * **Cons:** Does not fully represent basalt fiber-reinforced concrete, harder to modify after casting, requires curing time, and is not suitable for proving long-term marine durability because the prototype is only intended for controlled testing. * **Cons:** Does not fully represent basalt fiber-reinforced concrete, harder to modify after casting, requires curing time, and is not suitable for proving long-term marine durability because the prototype is only intended for controlled testing.
- 
- 
  
 **Option 3: Fully 3D-printed scale model or 3D-printed details** **Option 3: Fully 3D-printed scale model or 3D-printed details**
  
-A fully 3D-printed model can represent the geometry of the Reef Module, Smartlogger, and Smartlogger attachment accurately. 3D printing is useful for rapid prototyping because it allows detailed shapes to be produced and modified more easily during the design process [(PrusaPLA)]. For this reason, this option can be useful for checking the modular shape, assembly process, Smartlogger attachment, and packaging concept before producing a cement-based prototype.+A fully 3D-printed model can represent the geometry of the Reef Block, Smartlogger, and Smartlogger attachment accurately. 3D printing is useful for rapid prototyping because it allows detailed shapes to be produced and modified more easily during the design process [(PrusaPLA)]. For this reason, this option can be useful for checking the modular shape, assembly process, Smartlogger attachment, and packaging concept before producing a cement-based prototype.
  
-However, this option means that the Reef Module itself is made from 3D-printed plastic rather than cement or concrete. Because of this, the material properties are different from the final concrete-based product. A fully 3D-printed plastic model cannot represent the real weight, concrete surface texture, porosity, or marine durability of the final Reef Module. Therefore, it is useful for geometry and assembly validation, but not for checking realistic handling, seabed stability, or material behavior.+However, this option means that the Reef Block itself is made from 3D-printed plastic rather than cement or concrete. Because of this, the material properties are different from the final concrete-based product. A fully 3D-printed plastic model cannot represent the real weight, concrete surface texture, porosity, or marine durability of the final Reef Block. Therefore, it is useful for geometry and assembly validation, but not for checking realistic handling, seabed stability, or material behavior.
  
-In the selected prototype approach, 3D printing is used mainly to produce the PLA mold for cement casting, rather than to make the final Reef Module prototype itself. Additional 3D-printed parts may still be used for small details or Smartlogger attachment features that require accurate geometry.+In the selected prototype approach, 3D printing is used mainly to produce the PLA mold for cement casting, rather than to make the final Reef Block prototype itself. Additional 3D-printed parts may still be used for small details or Smartlogger attachment features that require accurate geometry.
  
 * **Pros:** Accurate geometry, easy to modify, fast to produce, suitable for assembly checks, Smartlogger attachment tests, packaging checks, and presentation. * **Pros:** Accurate geometry, easy to modify, fast to produce, suitable for assembly checks, Smartlogger attachment tests, packaging checks, and presentation.
-* **Cons:** Different from the final material, does not represent real module weight, concrete surface texture, porosity, or marine durability, and is not suitable for material durability or seabed stability testing.+* **Cons:** Different from the final material, does not represent real Reef Block weight, concrete surface texture, porosity, or marine durability, and is not suitable for material durability or seabed stability testing.
  
  
  
-=== 2.5.2 Sensor placements ===+=== 2.5.2 Sensor Placements ===
  
 Designing a successful marine habitat involves a delicate technical paradox. On one hand, the project’s primary objective is to encourage biological colonization and the growth of marine life; on the other, the integrated sensors require direct, unobstructed contact with seawater to maintain accuracy. This necessity creates a significant challenge, as the very "bio-friendly" environment the team aims to foster can lead to marine biofouling on sensitive equipment, which critically compromises data reliability and sensor sensitivity [(SAHOO2025)]. Designing a successful marine habitat involves a delicate technical paradox. On one hand, the project’s primary objective is to encourage biological colonization and the growth of marine life; on the other, the integrated sensors require direct, unobstructed contact with seawater to maintain accuracy. This necessity creates a significant challenge, as the very "bio-friendly" environment the team aims to foster can lead to marine biofouling on sensitive equipment, which critically compromises data reliability and sensor sensitivity [(SAHOO2025)].
  
-To resolve this conflict, the strategy focuses on three integrated design pillars. First, a careful selection of housing materials must be made to support structural durability while protecting the internal components. Second, evaluating specialized anti-fouling coatings that can prevent accumulation on sensor windows without leaching harmful chemicals into the surrounding habitat. Finally, the spatial distribution of the sensors must be strategically planned to allow for clear measurements while minimizing their exposure to rapid biological growth. This balanced approach ensures that the ecological goals do not come at the expense of long-term monitoring precision.+To resolve this conflict, the strategy focuses on three integrated design pillars. First, a careful selection of housing materials must be made to support structural durability while protecting the internal components. Second, specialized antifouling coatings should be evaluated to prevent accumulation on sensor windows without leaching harmful chemicals into the surrounding habitat. Finally, the spatial distribution of the sensors must be strategically planned to allow for clear measurements while minimizing their exposure to rapid biological growth. This balanced approach ensures that the ecological goals do not come at the expense of long-term monitoring precision.
  
 When positioning sensors, it is important to consider factors that may influence measurement accuracy, such as turbulence and disturbed flow conditions. Careful placement can significantly improve the reliability and consistency of the collected data. When positioning sensors, it is important to consider factors that may influence measurement accuracy, such as turbulence and disturbed flow conditions. Careful placement can significantly improve the reliability and consistency of the collected data.
-The Smartbox, which contains the sensors, is mounted at the top of the supporting structure to reduce the risk of interaction with seabed sediment. However, the sensors themselves should not be placed at the very top surface, as this location is more prone to biofouling, sediment accumulation, and coverage by marine organisms, which can degrade sensor performance over time.+ 
 +The Smartlogger, which contains the sensors, is mounted at the top of the Smartlogger attachment to reduce the risk of interaction with seabed sediment. However, the sensors themselves should not be placed at the very top surface, as this location is more prone to biofouling, sediment accumulation, and coverage by marine organisms, which can degrade sensor performance over time.
  
 Instead, the sensors are preferably mounted on a side surface where there is sufficient and consistent water flow. Positioning them slightly above the seabed further reduces the risk of sand and sediment deposition, ensuring more stable and accurate measurements. This placement also allows the surrounding water to circulate more freely around the sensors, which is particularly important for measurements such as conductivity, where undisturbed water flow is essential for obtaining reliable data. Instead, the sensors are preferably mounted on a side surface where there is sufficient and consistent water flow. Positioning them slightly above the seabed further reduces the risk of sand and sediment deposition, ensuring more stable and accurate measurements. This placement also allows the surrounding water to circulate more freely around the sensors, which is particularly important for measurements such as conductivity, where undisturbed water flow is essential for obtaining reliable data.
-In addition, the Smartbox is positioned to be as accessible as possible to facilitate maintenance operations, such as sensor cleaning, battery replacement, and data retrieval. 
  
 +In addition, the Smartlogger is positioned to be as accessible as possible to facilitate maintenance operations, such as sensor cleaning, battery replacement, and data retrieval.
  
 == 2.5.2.1 Materials for Housing == == 2.5.2.1 Materials for Housing ==
  
-The housing material must protect the internal electronics from high pressure and corrosion while maintaining long-term durability in seawater environments.+The Smartlogger housing material must protect the internal electronics from high pressure and corrosion while maintaining long-term durability in seawater environments.
  
-**Titanium alloy (TC4)** or **316 L stainless steel** are recommended for pressure resistance and durability [(SAHOO2025)]. For more than 200 m depth, **Titanium** is preferred for long-term corrosion resistance [(evologics)].+**Titanium alloy (TC4)** or **316 L stainless steel** are recommended for pressure resistance and durability [(SAHOO2025)]. For deeper or long-term deployments, titanium can be considered because it is described as a corrosion-resistant housing material suitable for long-term deployment in harsh environments, with a depth rating up to 6000 m [(EvoLogicsS2CR)].
  
 == 2.5.2.2 Antifouling Coatings == == 2.5.2.2 Antifouling Coatings ==
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 Even with durable housing materials, marine organisms may attach to exposed surfaces over time. For this reason, antifouling coatings are considered to reduce biological growth on sensors and maintain measurement accuracy. Even with durable housing materials, marine organisms may attach to exposed surfaces over time. For this reason, antifouling coatings are considered to reduce biological growth on sensors and maintain measurement accuracy.
  
-  *   **Polydimethylsiloxane (PDMS):** A non-toxic, "fouling-release" coating that reduces the adhesion of algae and barnacles [(SAHOO2025)]. +* **Polydimethylsiloxane (PDMS):** A non-toxic, "fouling-release" coating that reduces the adhesion of algae and barnacles [(SAHOO2025)]. 
-  *   **Camptothecin (CPT)-based Paint:** A natural compound that has shown virtually no macrofouling after nine months of immersion [(SAHOO2025)]. +* **Camptothecin (CPT)-based Paint:** A natural compound that has shown virtually no macrofouling after nine months of immersion [(SAHOO2025)]. 
-  *   **Slippery Liquid-Infused Porous Surfaces (SLIPS ):** These provide exceptional resistance to organism attachment even in stagnant water [(SAHOO2025)].+* **Slippery Liquid-Infused Porous Surfaces (SLIPS):** These provide exceptional resistance to organism attachment even in stagnant water [(SAHOO2025)].
  
  
  
  
- +=== 2.5.3 Biologic and Geographical analysis ===
- +
-=== 2.5.3 Biologic and geographical analysis ===+
  
 **Fish structure** **Fish structure**
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 ==== 2.6 Summary ==== ==== 2.6 Summary ====
-Chapter 2 gives an overview of existing artificial reef concepts, relevant companies, material choices, sensor challenges, and biological and geographical factors. It shows that Maris Habitats differs from many existing solutions by combining modular reef blocks with a removable smartlogger for long-term local data logging. The chapter also highlights that successful reef design depends on durable marine materials, structural complexity, suitable sensor placement, and careful site selection.+ 
 +Chapter 2 gives an overview of existing artificial reef concepts, relevant companies, material choices, sensor challenges, and biological and geographical factors. It shows that Maris Habitats differs from many existing solutions by combining modular Reef Blocks with a removable Smart Module for long-term local data logging. The chapter also highlights that successful reef design depends on durable marine materials, structural complexity, suitable sensor placement, and careful site selection.