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The application of iron oxide in the construction industry

Views: 6     Author: Site Editor     Publish Time: 2024-04-10      Origin: Site

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Introduction

 

Industrial applications

 

Pigments and Coatings: Ferrous oxide, commonly known as iron red, is commonly used as a pigment due to its reddish brown color and is widely used in industries such as paint, ink, and rubber. Iron oxide pigments have important applications in high-end automotive coatings, architectural coatings, anti-corrosion coatings, and other fields due to their excellent heat resistance, weather resistance, and absorption of ultraviolet rays.

 

Magnetic material: Fe3O4 has good magnetism and is the main component of naturally produced magnetite. It is widely used in the manufacturing of audio, video tapes, and telecommunications equipment. Soft magnetic ferrite has also been widely used in fields such as radio communication, broadcasting and television, and automatic control.

 

Catalyst: α- Fe2O3 powder particles, due to their huge specific surface area and surface effect, are excellent catalysts that can be used in the catalytic processes of polymer oxidation, reduction, and synthesis.

 

Daily life applications

 

Environmental purification: Nanoscale iron oxide has a good adsorption effect on certain pollutants in the environment, such as Cr (VI), and can be used to treat environmental wastewater.

 

Biomedical field: Nano iron oxide plays an important role in pharmaceutical capsules, drug synthesis, biomedical technology, and other fields.

 

Glass coloring: Glass colored with iron oxide can absorb both ultraviolet and infrared rays, and is widely used in the manufacturing of heat absorbing glass, sunglasses glass, etc.

 

The basic characteristics of iron oxide

 

Chemical composition and classification

 

Ferrous oxide, also known as iron monoxide, is a black powder that is unstable and easily oxidizes into ferric oxide in the air.

 

Iron trioxide: commonly known as iron red, is a reddish brown powder that is insoluble in water. It can react with acids to form trivalent iron salts and water, and has the properties of an alkaline oxide.

 

Iron trioxide, also known as iron oxide black, is a magnetic black crystal that is insoluble in water, acid, alkali, and organic solvents such as ethanol and ether.

 

Physical properties and color changes

 

Ferrous oxide: Physical properties are black powder with a relative density of about 5.7, soluble in acids, insoluble in water and alkaline solutions.

 

Iron trioxide: Physical properties are reddish brown powder, with a relative density of about 5.24 and a melting point of 1565 ℃. It is insoluble in water and soluble in acids such as hydrochloric acid and sulfuric acid.

 

Iron trioxide: It is a black crystal with a relative density of about 5.18 and a melting point of 1594.5 ℃. It is prone to oxidation into iron trioxide in humid air.

 

Application as a colorant

 

Iron oxide pigments have been widely used in the coloring of concrete and mortar due to their excellent coloring performance and economy, especially in the fields of architectural decoration and design. These pigments can be directly mixed into cement to provide the desired color for the building surface, thereby enhancing visual effects and aesthetic value.

 

In terms of coloring concrete and mortar, iron oxide pigments can provide a variety of color options from red, yellow to green. These pigments not only improve the appearance of concrete, but also provide certain protective effects, such as absorbing ultraviolet rays and protecting the base material from degradation. In addition, the weather and chemical resistance of iron oxide pigments make them stable in outdoor environments and less prone to fading.

 

The use of iron oxide pigments in architectural decoration and design can enhance the aesthetics and personalization of buildings. Designers can create unique architectural appearances and interior decoration effects by selecting different colors and textures. For example, by using iron oxide pigments, it is possible to simulate the texture of natural materials, such as imitating the appearance of rocks, bricks, or wood. In addition, colored concrete is also used to create building surfaces with specific images and textures. For example, by using colored concrete with rough and irregular surfaces, a touch close to the original texture of the human hand is created.

 

In summary, the application of iron oxide pigments in the coloring of concrete and mortar, as well as in building decoration and design, not only enriches the visual expression of buildings, but also improves the protective performance and durability of materials. It is one of the indispensable materials in modern architecture and design.

 

Reinforcement and anti-corrosion of concrete

 

Improving the mechanical properties of concrete

The purpose of concrete reinforcement is to improve its mechanical properties through various methods, such as bending, compression, and tensile strength. Common reinforcement methods include:

 

Paste steel plate or carbon fiber cloth: Use adhesive agents such as epoxy resin to paste the steel plate or carbon fiber cloth onto the surface of concrete to improve its bending and tensile properties.

 

Outsourced steel: By pasting angle steel around concrete components and welding reinforcement plates, the load-bearing capacity and stiffness of the components are enhanced.

 

Pre stressing: Applying external prestressing, such as using prestressed steel strands or carbon fiber panels, to enhance the overall performance of the structure.

 

Enlarged section method: adding new concrete layers and steel bars outside the original concrete components to improve the section size and structural bearing capacity.

 

Prevent corrosion and extend service life

The anti-corrosion treatment of concrete aims to prevent or slow down the corrosion process, thereby extending its service life. The anti-corrosion measures include:

 

Use anti-corrosion coatings, such as nano organic silicon concrete protective coatings and polymer concrete protective coatings, which can penetrate the surface of concrete, form a protective layer, and prevent the invasion of moisture and harmful substances.

 

Silane impregnation: Silane impregnation can penetrate the interior of concrete, react with water molecules to form a repellent layer, and improve the waterproofing and corrosion resistance of concrete.

 

Surface reinforcement: By coating waterproof materials such as polymer modified cement mortar or polymer waterproof coatings on the surface of concrete, the impermeability and weathering resistance can be improved.

 

Structural design optimization: Consider the durability of concrete structures during the design phase, select appropriate materials and construction measures, such as using corrosion-resistant aggregates and additives.

 

Environmentally friendly building materials

 

Sustainability and ecological impact

Resource efficiency: Environmentally friendly building materials typically use renewable resources or recycled materials, such as bamboo, recycled steel, and recycled plastics. The production process of these materials consumes less energy, reducing the consumption of natural resources.

 

Waste reduction: The design of these materials aims to reduce waste generation during the construction process and make them easy to recycle or biodegrade at the end of the building's lifecycle, thereby reducing the pressure on landfills.

 

Reducing pollution: Environmentally friendly building materials generate lower levels of pollution during production and use, including reducing harmful gas emissions, water pollution, and soil pollution.

 

Energy saving performance: These materials have good insulation performance and energy efficiency, which can reduce the energy consumption of buildings and reduce greenhouse gas emissions.

 

Promotion of green buildings

Design principles: Green building design follows the 3R principles - Reduce, Reuse, and Recycle. By optimizing the design to reduce material usage, choose recyclable or renewable materials, and design structures that are easy to disassemble and recycle in the future.

 

Certification systems: Green building certification systems such as LEED (Leading Energy and Environmental Design) and BREEAM (Building Research Environmental Assessment) encourage the use of environmentally friendly building materials and evaluate the overall environmental performance of buildings.

 

Policy support: Many countries and regions encourage the use of green building materials in the construction industry through legislation and fiscal incentives, such as tax reductions and subsidies, to promote the development of green buildings.

 

Public awareness: With the increasing awareness of environmental protection, consumers and architects are increasingly inclined to choose building materials that have less impact on the environment, which further drives the market demand and technological innovation for green building materials.

 

Other building uses of iron oxide

 

Road and bridge construction

 

As a pigment: Iron oxide pigments are widely used in road marking paints due to their excellent heat resistance, weather resistance, and UV absorption properties. These pigments can enhance the visibility and durability of road markings, ensuring clear visibility under various climatic conditions.

 

Concrete coloring: Iron oxide is also used for coloring concrete, providing a beautiful appearance for bridges and roads, while protecting concrete from environmental factors.

 

Refractory materials and insulation layer

 

Fire resistance: Iron oxide is used as a component of refractory materials, especially in the production of refractory bricks and refractory concrete, due to its stable chemical properties and high temperature resistance. These materials can withstand high temperatures without decomposition and are suitable for furnaces, chimneys, and other structures that require fire resistance.

 

Insulation layer: The thermal stability of iron oxide makes it an ideal material for making insulation layers. In buildings, iron oxide can serve as a component of thermal insulation coatings, helping to reduce heat transfer and improve building energy efficiency.

 

Safety and environmental considerations

 

Safety protection during use

Personal protective equipment: Operators should wear appropriate personal protective equipment, such as protective goggles, gloves, protective clothing, and masks, to prevent contact and inhalation of dust and chemicals.

 

Ventilation system: During the use of iron oxide powder or particles, good ventilation conditions should be ensured to reduce the concentration of dust in the air and prevent respiratory inhalation.

 

Operating procedures: Follow strict operating procedures and safety guidelines to avoid direct contact between iron oxide and skin, especially with eyes, to prevent irritation.

 

Emergency preparedness: The workplace should be equipped with first aid equipment and emergency response measures, such as eye wash stations and first aid kits, to cope with possible accidents.

 

Waste disposal and environmental protection

 

Waste classification: Classify and collect iron oxide waste to ensure it does not mix with other chemicals, in order to reduce pollution risks.

 

Compliance treatment: According to local environmental regulations and guidelines, safely handle and dispose of iron oxide waste to avoid pollution to soil and water bodies.

 

Recycling: Encourage the recycling and reuse of iron oxide waste to reduce waste generation and treatment costs.

 

Environmental monitoring: Regularly monitor the environment of places where iron oxide is produced and used to ensure that emission standards meet environmental requirements.

 

Environmental awareness training: Provide operators with training on environmental awareness and safety operations to enhance their awareness and sense of responsibility for environmental protection.

 

Conclusion

 

Comprehensive evaluation

Pigments and fillers: Iron oxide is a commonly used pigment and filler in the construction industry, providing color and covering power for concrete, mortar, paint, and coatings. Its weather resistance and chemical stability make it an ideal choice for indoor and outdoor decoration.

 

Environmental characteristics: As an inorganic pigment, iron oxide has lower environmental risks compared to organic pigments. Its use helps to reduce VOC emissions and meets the requirements of green building and sustainable development.

 

Technological progress: With the development of technology, the production and application of iron oxide have become more efficient and environmentally friendly. For example, the application of suspension magnetization roasting technology has improved the utilization rate of refractory iron oxide ore and reduced environmental pollution.

 

Economic benefits: Iron oxide has high cost-effectiveness, is easy to produce and apply on a large scale, helps reduce construction costs, while maintaining building quality and aesthetics.

 

Outlook for future development

Technological innovation: It is expected that the production technology of iron oxide will continue to advance in the future, improving product quality and production efficiency, while reducing energy consumption and environmental pollution.

 

Application Expansion: The application fields of iron oxide may further expand, especially in environmentally friendly building materials and intelligent building technologies, where new uses of iron oxide will continue to emerge.

 

Market demand growth: With the advancement of global infrastructure construction and urbanization, the demand for iron oxide is expected to continue to grow, especially in emerging economies.

 

Environmental regulations: The strengthening of environmental regulations will promote the development of the iron oxide industry towards a more green and sustainable direction, promoting clean production and waste recycling.


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