Ethan Clarke
Plastic cement is a well-known adhesive used for gluing plastic components together. However, cement and plastic are two different materials. Cement is a construction material made with aggregates and paste, while plastic is a synthetic polymer. Interestingly, researchers have explored combining plastic with cement to create a more sustainable and stronger construction material. This involves using recycled plastic flakes exposed to gamma radiation, mixed with cement paste and fly ash, resulting in concrete that is up to 20% stronger than traditional concrete. This innovative approach not only strengthens the concrete but also reduces the carbon emissions associated with the cement industry.
| Characteristics | Values |
|---|---|
| Cement with recycled plastic | 15-20% stronger than traditional concrete |
| Cement with recycled plastic | Could reduce the carbon emissions of the cement industry |
| Cement with recycled plastic | Could redirect plastic waste from landfills |
| Cement with recycled plastic | May be cheaper to manufacture than ordinary concrete |
| Cement with recycled plastic | May be quicker to install and use than ordinary concrete |
| Cement with recycled plastic | Can be used as a non-structural component in building construction |
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What You'll Learn
Plastic cement is used for gluing polystyrene model kits
Plastic cement is a popular adhesive used for gluing polystyrene model kits. It is a gel-like substance that chemically melts and welds two surfaces together, creating a strong bond. The key ingredient in plastic cement is Methyl Ethyl Ketone (MEK), which acts as a solvent for polystyrene. When applied, the MEK dissolves and softens the polystyrene, and as it evaporates, the polystyrene re-hardens, resulting in a seamless joint.
Plastic cement is specifically formulated for joining polystyrene plastics, making it ideal for gluing polystyrene model kits. Its ability to fill small gaps and create a smooth finish makes it a preferred choice among model builders. Additionally, plastic cement dries quickly, typically within two hours, allowing for efficient construction.
One notable advantage of using plastic cement is its ability to create a seamless finish. Unlike other adhesives, it does not leave visible seams between glued parts, enhancing the overall appearance of the model kit. This feature is particularly important for scale modellers who strive for a realistic and detailed finish.
When working with plastic cement, it is essential to apply it sparingly and only use the amount necessary for effective bonding. Holding the parts together for approximately 20 seconds ensures a secure joint. Once dry, the plastic cement can be sanded and reshaped without compromising the strength of the joint.
While plastic cement is highly effective for gluing polystyrene model kits, it may not be suitable for all types of plastics or materials. For instance, resin models and gaming pieces made of PVC may require alternative adhesives as plastic cement is designed specifically for polystyrene. Nevertheless, for gluing polystyrene model kits, plastic cement remains the adhesive of choice for many hobbyists and seasoned modellers.
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MIT students have developed a form of concrete using recycled plastic
Cement and concrete are not types of plastic. However, MIT students have developed a novel method to fortify concrete by adding recycled plastic. This innovative approach involves exposing plastic flakes to small, harmless doses of gamma radiation, transforming them into a stronger, stiffer, and tougher material. After irradiation, the plastic flakes are ground into a fine powder and mixed with cement paste, resulting in concrete that is up to 20% stronger than traditional concrete.
This breakthrough has significant environmental implications, addressing two pressing issues: plastic waste and carbon emissions from concrete production. By repurposing discarded plastic bottles, the MIT students' method diverts plastic from landfills, where it would otherwise accumulate. Additionally, it reduces the need for cement in concrete production, lowering carbon dioxide emissions associated with cement manufacturing, which accounts for about 4.5% of global human-induced carbon emissions.
The key to the success of this method lies in the irradiation process. Exposing plastic to gamma radiation alters its crystalline structure, enhancing its strength and reactivity. When mixed with Portland cement and fly ash, the irradiated plastic forms a synergistic combination, resulting in stronger concrete. The higher the dose of irradiation, the stronger the resulting concrete becomes, indicating the potential for further optimization through tailored mixtures and irradiation processes.
The versatility of this approach extends beyond its environmental benefits. The strengthened concrete has potential applications in both structural and non-structural contexts, ranging from sidewalks and street barriers to buildings and bridges. This discovery opens up new possibilities for utilizing recycled plastic bottles, transforming them into a valuable resource for constructing durable and flexible concrete structures.
The MIT students' research, published in the journal Waste Management, offers a promising solution to mitigating the environmental impact of concrete production while simultaneously addressing the global problem of plastic waste. Their work underscores the potential for sustainable solutions that improve performance and reduce waste, highlighting the innovative thinking and problem-solving capabilities of the students involved.
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Irradiated plastic can strengthen concrete
Cement is not a type of plastic. However, plastic can be used to strengthen concrete.
Concrete is the second most widely used material on the planet, after water. Its production generates about 4.5% of the world's carbon dioxide emissions. Researchers at MIT have found that substituting about 1.5% of concrete with irradiated plastic can significantly improve its strength. This could have a major impact on reducing the cement industry's global carbon footprint.
The MIT team obtained flakes of polyethylene terephthalate (the plastic used to make water and soda bottles) and exposed them to small, harmless doses of gamma radiation. This process changes the plastic's crystalline structure, making it stronger, stiffer, and tougher. The irradiated plastic flakes are then pulverized into a fine powder and mixed with cement paste and fly ash to produce concrete.
The addition of irradiated plastic increases the concrete's strength by up to 15% compared to samples made with Portland cement alone. This is due to the increased cross-linking, or molecular connections, in the crystalline structures of the samples containing irradiated plastic.
Furthermore, the use of irradiated plastic as a concrete additive can improve the mechanical properties of the concrete. When used in a concrete mixture, irradiated plastic combines with calcium hydroxide to form additional calcium silicate hydrate (CSH), which strengthens and holds concrete together. This densifies the cementitious matrix, improving the concrete's compressive and tensile strength.
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Plastic is a cheap, lightweight, and versatile material
The use of plastic has resulted in an increase in plastic waste, which has negative environmental consequences. Researchers are now looking at ways to reuse this waste, including using it in concrete manufacturing. For example, MIT students have developed a form of concrete using recycled plastic water bottles, which is stronger and more flexible than traditional concrete. This technology can be used to build structures such as sidewalks, street barriers, buildings, and bridges.
The process involves exposing plastic flakes to small doses of gamma radiation, which changes the crystalline structure of the plastic, making it stronger, stiffer, and tougher. The irradiated plastic is then mixed with cement paste and fly ash to produce concrete. This method also uses less cement, which helps to reduce the carbon emissions associated with concrete production.
In addition to the environmental benefits, the use of recycled plastic in concrete can also improve the thermal and sound insulation of the resulting structure. The lightweight nature of plastic means that it can be used as a partial replacement for the aggregate in concrete, which is typically the heaviest part. This results in a more efficient and cost-effective manufacturing process.
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Plastic waste can be used as a replacement for sand in concrete
Cement is not a type of plastic. However, plastic waste can be used as a replacement for sand in concrete. Research from Bath University, in partnership with India's Goa Engineering College, has demonstrated that sand used in concrete can be replaced with waste plastic. This could lead to more sustainable construction practices.
Sand typically comprises about 25%-30% of any concrete mixture. By substituting 10% of the sand with finely ground plastic particles, the Bath team estimates that over 800 million tonnes of sand could be conserved annually. This is significant, as sand is the world's second most consumed substance after freshwater, with an estimated global production of more than 20 billion tons of concrete every year.
The study, published in the journal 'Construction and Building Materials', explored the impact of five different finely graded plastics on the structural strength of concrete tubes and cylinders. The best results were achieved using sand-sized PET particles from recycled plastic bottles, which attained a target compressive strength similar to that of structural concrete.
Dr. John Orr, a lecturer in concrete structures at Cambridge University, has also researched the potential impact of this solution in India. He found that plastic waste can be sorted, cleaned, shredded, and crushed into a sand alternative for concrete. Dr. Orr's research concluded that replacing 10% of the sand in concrete with plastic waste could reduce the amount of sand needed without compromising the strength and longevity of the concrete.
While using plastic waste in concrete offers a promising solution to sand shortages and helps reduce plastic waste, experts like Dr. Orr and Vince Beiser caution against relying solely on this innovation. They emphasize that a more viable long-term approach involves changes in building design to reduce overconsumption of natural resources, including sand and concrete.
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Frequently asked questions
No, cement is not a type of plastic. Cement is a construction material that can be mixed with water, sand, and gravel to create concrete.
Plastic is sometimes added to cement mixtures to enhance the resulting concrete. MIT students discovered that exposing plastic to gamma radiation strengthens the material, and when added to cement, it can create concrete that is up to 20% stronger than traditional concrete.
Adding plastic to cement helps reduce the carbon footprint of the construction industry. Plastic is lightweight, readily available, and its use in concrete manufacturing reduces waste and carbon dioxide emissions.
Plastic cement is an adhesive commonly used for scale models and miniatures. It fuses parts together without leaving seams and can fill small gaps. The classic ingredient in plastic cement is Methyl Ethyl Ketone (MEK), which acts as a solvent for polystyrene, the plastic commonly used in model kits.
