Scientists from Tartu have developed a material which could make it possible to print energy-efficient houses out of milled peat and oil shale ash quickly and cheaply using a 3D printer.
Scientists from the University of Tartu and the Estonian University of Life Sciences have created a construction material consisting primarily of peat and oil shale ash which may reduce the construction costs of a private house nearly tenfold.
The aim was to create such a self-supporting construction material based on local natural resources and waste that could be used to 3D print houses that are up to two-storeys high directly on the construction site.
Better use of resources
Wetlands cover about 22% of Estonia’s area, but the peat growing there is used in extremely small amounts. So far, only the drier top part of the peat layer has been deemed usable. The unused part is left to decay.
This peat could also be used in an economically beneficial way. Many fractions can be separated from peat, for example humic substances and waxes, and the final residue can even be used for producing cellulose.
The most popular method for mining peat is milling. During milling, 10-20-mm layers are cut loose from the peat deposit and left to dry. For this method to pay off, most milling fields are larger than 100 hectares.
Raising the value of waste
“So far, no one has produced peat composite as a construction material because peat prevents many materials from hardening. In our project, we managed to overcome this issue,” said Liiv excitedly.
Instead of the usual cement, scientists from Tartu use oil shale ash as the binder in their mix. In Estonia, it is estimated that about 7 million tonnes of oil shale ash are created in a year, only 5% of which is reused. The rest is deposited in ash hills and this creates considerable environmental pollution.
Oil shale ash is classified as a hazardous waste because it becomes very basic when in contact with water (pH almost 13). However, ash with such a pH is the best fit for construction materials. The developed material is completely harmless and safe for the environment.
Furthermore, during testing, scientists found a solution for reducing the setting time from about 30 days to one day. If the pH of a pore solution is below 9, it won’t harden at all. This issue is solved by a very high pH by binding the potassium oxide and alkali metals found in oil shale ash to insoluble compounds.
Inside the peat, oil shale ash reacts with humic acids and absorbs carbon dioxide. Due to chemical reactions, the binder becomes regular concrete and limestone.
According to Toomas Tenno, a professor at the University of Tartu’s chair of colloidal and environmental chemistry, nanosized additives, e.g. nanosilica or silicon smoke, are added to peat and oil shale ash to improve their properties.
“As the particles are very small, they dissolve well and distribute throughout the material evenly. Silicon smoke improves the quality of this material significantly,” said Tenno.
Good properties
It took about a year before the right mixture was found for the material that is strong and has very good thermal conductivity. After final hardening, the material is strong and very light, has low heat transfer and is durable. Even though peat is also used as fuel, the material developed by scientists is incombustible.
The peat material achieves its initial hardness in 24 hours but remains elastic for a considerably longer time. Thus, there is no need for insulation or fillers and the entire structure becomes airtight without adding any wind protection. Furthermore, it is a good noise blocker.
As peat and oil shale ash are not very expensive, house builders would be especially happy about the price of the material. According to Liiv, scientists calculated that the cost for the construction of a house shell printed from this material with a floor surface of 100-150 square meters could be about €5,000 (compared to the construction of the shell of a framed building of equivalent size, which would cost about ten times more).
By now, the research as well as many tests have been completed. Issues with materials technology have been resolved successfully. Peat material is ready for manufacture as elements, but a lot of work still needs to be done for 3D printing.
Learn more: A house could be printed in a day using a novel peat material
The Latest on: 3D printed house
[google_news title=”” keyword=”3D printed house” num_posts=”10″ blurb_length=”0″ show_thumb=”left”]
via Google News
The Latest on: 3D printed house
- World's largest 3D printer can print a house in under 80 hourson April 26, 2024 at 10:56 am
The University of Maine just revealed the world’s largest 3D printer, and it is an absolute beast. The printer, which the university named Factory of … The post World’s largest 3D printer can print a ...
- The world's largest 3D printer is at a university in Maine. It just unveiled an even bigger oneon April 26, 2024 at 8:35 am
ORONO, Maine (AP) — The world’s largest 3D printer has created a house that can cut construction time and labor. An even larger printer unveiled on Tuesday may one day create entire neighborhoods.
- World's biggest 3D printer whirs into actionon April 26, 2024 at 7:09 am
A giant 3D printer, which is big enough to make a house, has been unveiled at the University of Maine. The university says it has beaten its own record for the world's largest polymer 3D printer - ...
- The world’s largest 3D printer prints a house in 80 hourson April 25, 2024 at 10:40 pm
The University of Maine has just unveiled the world's largest polymer 3D printer. The new device, called Factory of the Future 1.0 (FoF 1.0), can prin ...
- Affordable starter home is 3D-printed in just 18 hourson April 25, 2024 at 6:31 am
One of the most exciting possibilities of 3D-printed architecture is that it could revolutionize affordable housing. Portugal's Havelar shows this may soon be within reach with its inaugural ...
- World's biggest 3D printer unveiled in Maine may one day create entire neighborhoodson April 24, 2024 at 9:14 am
ORONO, Maine - The world's largest 3D printer has created a house that can cut construction time and labor. An even larger printer unveiled on Tuesday may one day create entire neighborhoods. The ...
- Worlds largest 3D printer is at UMaine, constructing houseson April 24, 2024 at 4:32 am
ORONO, Maine — The world’s largest 3D printer has created a house that can cut construction time and labor. An even larger printer unveiled on Tuesday may one day create entire neighborhoods. The ...
- World’s largest 3D printer can build a small house in 80 hourson April 24, 2024 at 2:54 am
D printer is here to help its predecessor reach this goal of providing more for less. The FoF 1.0 3D printer will build ...
- World’s Largest 3D Printer Unveiled at University of Maineon April 24, 2024 at 1:40 am
The world’s largest 3D printer has created a house that can cut construction time and labor. An even larger printer was unveiled Tuesday.
via Bing News