The Floating Azolla District

The Floating Azolla District consists on a proposed community that emphasises a circular economy with a focus on sustainable agriculture in Rotterdam. It builds on to the existing Floating Farm found in the M4H area. It is formed of three areas:

1) Azolla – Dwellings combining a series of residential units for the increasing number of young entrepreneurs in the RID with three central cores growing stacked trays of Azolla as in vertical farming.

2) The Floating Farm which continues to produce dairy products and a Bamboo growing area to maintain the upkeep of floating platforms and construction of new dwellings. Floating rice paddies are grown in the warmer months in a closely monitored system of permaculture.

3) A production facility which concentrates on research and development into Azolla as well as retrieving the water fern’s byproducts such as bioplastics extracted from the sugars; biofuel, from the lipids; and bamboo plywood lumber for the construction of the expanding Floating District.

Azolla – Dwellings

This section concentrates on the detail construction of the Azolla-Dwellings. These floating units are designed to be used as a combination of co-housing for entrepreneurs working in the Rotterdam Innovation District, where the Floating Farm is located, and indoor Azolla growing facilities which is then used further along in the masterplan. The growing areas are built on a series of building components that provide support for trays of Azolla to be grown in a vertical farming manner and provide support for the floor plates as well as anchoring for the entire dwelling.

The materials are a combination of local bamboo grown on a series of floating platforms that prevent the cold winter winds from affecting the overall masterplan and pallets sourced from neighbouring industrial facilities.

The dwellings’ facade is a result of a careful analysis of harmful and beneficial solar radiation. By setting an initial average temperature to monitory, the facade will block sun that naturally would drive the temperature above the chosen one and the beneficial would bring the temperature up. This shading serves a buffer zone that surrounds the internal living spaces and is used to grow vegetables for the residents.

Semi-public spaces are located on the ground floor (open plan kitchen and living) and bedrooms are located on the first floor, surround a central spiral staircase for circulation.

A building system based on reciprocal structures is coated in azolla bioplastic preventing the wood from rotting and making the form waterproof. These are used as underwater columns which allow the dwellings and platforms to float. Each ‘column’ can support a load of 2011Kg.

By using a similar system to a camera aperture ring, the mechanical device pictured below would automatically harvest the necessary Azolla from the vertical trays twice a day with the tidal change, providing an everlasting continuous harvest for the Azolla to continue to grow. The Azolla is then collected and continued to be used throughout the proposal.

.

WHAT IS AZOLLA?

Azolla is a minuscule floating plant that forms part of a genus of 7 species of aquatic ferns, also known as Mosquito Fern. It holds the world record in biomass producer – doubling in 2-3 days. The secret behind this plant is its symbiotic relationship with nitrogen fixing cyanobacterium Anabaena making it a superorganism. The Azolla Provides a microclimate for the cyanobacteria in exchange for nitrate fertiliser. Azolla is the only known case where a symbiotic relationship endures during the fern’s reproductive cycle and is passed on to the next generation. They also have a complimentary photosynthesis, using light from most of the visible spectrum and their growth is accelerated with elevated CO2 and Nitrogen.

Azolla is capable of producing natural biofertiliser, bioplastics because of its sugar contents and biofuel because of the large amount of lipids. Its growth requirements can accommodate many climates too, allowing it to be classified as a weed in many countries. I was able to study the necessary m2 of growing Azolla to sequester the same amount as my yearly CO2 emissions, resulting in 57% of a football field equivalent of growing Azolla to make me carbon neutral.

Why is this useful? Climate change will inevitably bring more adverse climate conditions that will put many world wide crops at risk and, as a consequence, will affect our lives. A crop that produces biomass at the speed of Azolla provides at advantage in flexibility: a soya bean can take months to grow until ready to be harvested, Azolla can be harvested twice a week. This plant has the potential to be used in the larger agricultural sector and diminish the Greenhouse Gas Emissions of one of the most pollutant sectors.

REAL LIFE ACTION

I contacted the Azolla Research Group at the University of Utrecht and they kindly accepted to give us a tour of their research facilities, providing us with an in-depth insight into the aquatic fern. I also decided to approach the Floating Farm with a proposal of using Azolla in their dairy process. They agreed to explore this and I put them in contact with the research team in the University of Utrecht, who are now cooperating with the dairy farm’s team in decreasing the carbon emissions of the cows on the farm.

.

SITE LOCATION

Based on this event taking place outside the initially academic intention of the visit, I decided to use the Floating Farm as a site and a starting point for my proposal. The floating farm is intended to stand out and create an awareness of the possibility or idea of living on water and taking ownership of one’s food production, which seems to match the potential uses and benefits of Azolla. The researchers at the University of Utrecht expressed their need of getting the advantages of this plant to a wider public and this remained in my mind, possibly being the main reason behind my approach to the Floating Farm.

The Floating Farm sits in the Merwehaven area or M4H in the Port of Rotterdam. Highlighted below are industrial factories in the area which are potential sources of wooden pallets to be used in the construction of the proposal.

In 2007, Rotterdam announced its ambition to become 100% climate-proof by 2025 despite having 80% of its land underwater, therefore it was important to look at the flood risk and tidal change. The Merwehaven area in Rotterdam seems to have an average tidal change of 2 metres which I thought could be taken advantage of in a mechanical system mentioned previously.

.

BUILDING SYSTEM & MATERIAL RESEARCH

I chose to begin by looking into the Fern plant and its’ form. All ferns are Pinnate – central axis and smaller side branches – considered a primitive condition. The veins never coalesce and are known to be ‘free’. The leaves that are broadly ovate or triangular tend to be born at right angles to the sunlight.

I then decided to model a leaf digitally, attempting to simulate the fractal nature found in a fern frond and the leaves to 3 degrees of fractals. I then simplified the fern frond to 2 levels to allow for easier laser cutting and structural stability. The large perimeter meant, therefore, there was a large amount of surface area for friction so I explored different configurations and tested their intersections.

I then selected the fern frond intersection I found to show the best stability out of the tested ones shown previously. By arraying them further, they began to curve. When pressure is applied to the top of the arch, the intersections are strengthened and the piece appears to gain structural integrity.

When a full revolution is completed, the components appear to gain their maximum structural integrity. Since I had decided to digitally model the fern frond, I was able to decrease the distance between the individual leaves in the centre of each frond through grasshopper. By doing this, the intersections connecting a frond with another were less tight in the centre than on the extremities of each frond, allowing for double curvature.

I continued to iterate the leave by decreasing any arching on the leaf and finding the minimum component, the smallest possible component in the system. By arraying a component formed of 3 ‘leaves’ on one hand and 2 on the other, I would be able to grow the system in one direction as before due to the reciprocal organisation and in the other direction by staggering the adjacent component. The stress tests of this arrangement showed a phased failure of the ‘column’. Instead of breaking at once, row by row of components failed with time, outwards-inwards.

I extracted the minimum possible component from the previous iterations and attempted to merge the system with firstly, 3d printed PLA bioplastic components and then with an algae bioplastic produced at home. I became interested in the idea of being able to coat the wood in an algae bioplastic substituting the need for any epoxy for waterproofing. The stress tests for this component showed a surprising total of 956 kg-force for it to fail.

Here, I began combining different quantities of vegetable glycerine, agar agar (extracted from red algae and used for cooking) and water. By changing the ratios of agar and glycerine I was able to create 2 different bioplastics: one being brittle and the other flexible. See above for the flexible sample and below for the brittle sample. Both samples appeared to fail under the same 7 Kg-force.

For additional information please visit: https://jcboybarbados6.wixsite.com/atsii

Gum City Summary

Gum Arabic is a natural adhesive grown on the Senegalia Senegal tree. This tree grows in 6 years and only requires 100-200ml of water a year, this is a tree which has evolved to survive in the desert.

How can a third world country like Sudan can use a natural adhesive to act as a binder? How can we use the natural terrain as a framework for creating complex and controllable design?

Below the images illustrate how the construction process works.

https://vimeo.com/414603649 – Sucking Mechanism

I have designed a time-based construction programme. It begins with a setting out plan where string is used to determine where an industrial hoover (which usually transfers sand) sucks out sand and it is spewed out elsewhere. When my mix has been added to these cone shape voids the hoovering process is repeated but this time a thick layer of the Gum Arabic, Clay and Sand mix. The mixture is then lightly misted with salt water which causes the Gum Arabic to act as the binder. The Desert’s scorching sun then does the rest to solidify the material. Excavation around the land enables a structure which stands upright.

After exploring this method myself I discovered some interesting variations depending on whether I suck the sand first or pour it

I explored these forms digitally.

If you are wondering how I got to this point, well I will jump back to the beginning.

It started in Kew Gardens London, where I chose to study a plant and look into the early stages of bio-mimicry. I chose to study the Lotus Pod (Nelumbo Nucifera) found in Asia.

I wanted to find consistency between the holes of the flowers. Therefore I purchased 40 flower heads and begun experiments to study the arrangement of holes and the parameters within the plant. After experimenting I discovered that flower heads sized between 50-60mm have a gradient like effect where the largest hole is 3.5 times larger than the smallest. I therefore used Frei Ottos sand draining technique to explore what forms can be achieved with the arrangement of holes being that of the Lotus Pod.

After designing and building a smart box I began a matrix study.

I then Explored the parameters of each of these and found out that this sand grain drains at 30 degrees.

From this point I went on to look at how to solidify sand in its current form and that is when I discovered the properties of the Gum Arabic and began to explore. I had began to mix the mixture with sand and clay.

I then explored a site based on where Gum Arabic is produced and where sand and clay is in abundance. Therefore leaving me with Al-Fashir Sudan.

I then Explored the construction techniques using the gravity. Using the terrain as a natural formwork which can be moulded.

I then continued to design a construction process which requires less labour and would achieve high quality design attributes. Which is where I began with the hoovering process.

Bananas About Bananas

Bananas are the 4th most important crop after rice, wheat and corn. 135 countries grow bananas producing 145 million tonnes per year. The banana industry is worth 52 billion dollars and 400 million people rely on the crop as a staple food or stable source of income. These high figures of production and the aim of producing bananas as cheap as possible for high profits means poor working conditions for workers and a lot of waste. There is a great potential in banana waste i.e. the pseudo-trunk, to be used as an extra source of income by making textiles or using it as a building material.

Banana Plant | Musa

The banana fruit
Section through the fruit

Statistics

Production

Growing

Growth Cycle

Telescopic Growth

The Pseudo-trunk

Geometrical analysis of the pseudo-trunk

Otherwise known as the pseudo-stem or ‘false trunk’, the trunk of the banana tree is in fact made out of tightly packed leaves. The cells shown in the cross section transport all the nutrients and water from the earth to the rest of the plant. At the moment, the pseudo-trunk is waste product to the banana industry. It is a heavily un-utilised resource that can be used to make textiles or bio-fuel.

Form experimenting of the pseudo-trunk structure using paper made from banana

Using the pseudo-trunk waste for useful materials

By-products of the pseudo-trunk
Fibrous strands from inside to trunk
Mechanical fibre extraction process
By products of the banana pseudo-trunk: fibre, yarn and fabric. All 100% banana fibre.

Banana Rope (Manila Rope)

Banana rope has been used historically for things such as ship lines, towing, climbing and landscaping. Manila rope gets its name from the capital of the Philippines, Manila, as a lot of the rope is made there.

The rope is flexible yet non-stretching, durable and resistance to salt water damage. For these reasons its a common choice for ship lines, fishing nets and decorative purposes. It’s used in gyms due to its ability to absorb sweat and therefore act as a good grip.

Weaving techniques using banana rope and yarn
Structure made from weaved banana rope and banana yarn

Investigating the Performance of a Curved Profile

The Cycas Thouarsii (Madagascar Sago) is a subtropical plant from the Genus: Cycas. Their resistance to hurricanes, wildfires and droughts is part of the reason for their continued survival to the present day. Understanding the structural composition of the plants will help establish what naturally occurring systems allow to the plant to be so durable.

The stems of the plant show utilise a V/U shaped structure which improves stability.

Testing variations of the ‘V’ shaped base inspired by the Cycad will help understand the relationship between a curved profile and strength/durability.

This Investigation shows how different curves perform under gravitational load.


Curve Test: Paper Cantilever I

The experiment began with pieces of paper cut at the same length. Then they were cut in length until the piece of paper stayed upright under its own weight.

Curve Test: Paper Cantilever II

The geometries were produced in Grasshopper, utilising the graph mapper for mathematical curves. Since the Cycad plant has a stem in the shape of a Parabola / V, I began by testing how increasing the depth of a parabola curve can increase the performance of the paper cut out.

Following the initial experiment, the other pieces of paper that failed were trimmed until they stood upright against gravity.
The Length of each extrusion was measured, which again found that the ‘Circle, Ellipse, and Sinc’ Curves were the most structurally sound. The parabola curve also performed greater than expected, with a similar extrusion length to the Sinc Curve.

Curve Test: Plywood Cantilever

The purpose of the experiment was to see if Plywood performs in a similar way to paper when conducting the same tests.

In order to get the plywood to bend into the desired forms, the plywood was initially scored by the laser cutter on one side of the sheet. These scores allowed gaps to be produced between the sheets of the plywood when bending.

Plywood Array :

The purpose of this experiment is to understand how the curved plywood experiment performs under various arrangements. The base model features arrays with varying angles, and distances apart in order to better understand how the curves can look and connect together.

The second part of this investigation set out to understand how the plywood reacts to varying degrees of tension. String tension members were connected to the cylindrical array in a similar manor to the arrangement found in pine cones.

Plywood : 180 x 360

Utilising the curve of the plywood, investigation was conducted into the various degrees in which the wood can bend.