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Fly Ash Bricks vs Red Bricks : Which One Should You Use ?

When it comes to building a house or any other structure, one of the most important decisions is choosing the right type of bricks. In recent years, fly ash bricks have gained popularity as an alternative to traditional red bricks. But between fly ash bricks vs red bricks, which one should you use ?

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Explore the world of bricks and discover the differences between fly ash bricks vs red bricks. Whether you're a homeowner or contractor, this blog post will provide valuable knowledge to help you select the right bricks for your construction needs.



What are fly ash bricks ?

Fly ash bricks are made from industrial waste materials such as fly ash, which is a by-product of coal-fired power plants. Fly ash is mixed with cement, water, and other materials to form a paste, which is then poured into moulds and baked at high temperatures to create durable, lightweight bricks.



What is red brick ?

Red brick, also known as clay brick, is a type of building material made from natural clay that is formed into rectangular shapes and then fired in a kiln at high temperatures. It is one of the oldest and most traditional construction materials used worldwide.
 

Fly ash bricks vs red bricks

While both types of bricks have their own advantages and disadvantages, there is a quite major difference in fly ash bricks and red brick.

 

1. Composition

Fly ash bricks are manufactured using industrial waste materials, primarily fly ash obtained from coal-fired power plants. This waste material is combined with cement, sand, and water to form a paste, which is then moulded and cured to create the bricks. On the other hand, red bricks are made from clay, a naturally occurring resource that is abundant in many regions. The clay is mixed with water, moulded into brick shapes, and fired in kilns to harden them.
 

2. Insulation

Fly ash bricks have limited thermal insulation properties and may not effectively retain heat in cold climates. In contrast, red bricks offer both sound and thermal insulation due to their higher density and lower thermal conductivity. This makes red bricks a preferable choice for environments where temperature regulation and noise reduction are important considerations.
 

3. Surface

Fly ash bricks offer a smooth surface finish, eliminating the need for plastering. Their smooth texture provides aesthetic appeal and reduces the overall construction time and cost. In contrast, red bricks typically require plastering to achieve a smooth and finished appearance.
 

4. Density

Fly ash bricks are lightweight compared to red bricks. The inclusion of fly ash, which is a lightweight material, in the manufacturing process reduces the overall density of fly ash bricks. This lightweight nature makes them easier to handle, transport, and install during construction. In contrast, red bricks are heavier and denser due to the clay used. The higher density of red bricks provides additional strength and stability to the structures in which they are used.
 

5. Compressive Strength

Red bricks are renowned for their strength and durability. They have a higher compressive strength compared to fly ash bricks, making them suitable for load-bearing applications. The higher strength of red bricks allows them to withstand heavier loads without experiencing significant deformation or failure. Fly ash bricks have a lower compressive strength compared to red bricks, but they still possess adequate strength for many construction purposes.
 

6. Water absorption

Fly ash bricks tend to have a higher water absorption rate compared to red bricks. The porous nature of fly ash bricks, coupled with the presence of fine particles, can result in increased water absorption. This higher water absorption rate makes fly ash bricks more susceptible to moisture-related issues such as efflorescence and spalling if not properly protected or waterproofed. Red bricks, with their denser structure, generally have a lower water absorption rate and are less prone to moisture-related problems.
 

7. Self-Weight

Fly ash bricks are comparatively lighter than red bricks. The lightweight nature of fly ash bricks makes them easier to handle, transport, and install during construction. Red bricks, being heavier, require more effort and labour for transportation and installation. In terms of weight between fly ash bricks vs red bricks, the former would be a smarter option to choose.

These elaborations provide a deeper understanding of the differences between fly ash bricks and red bricks, highlighting their characteristics, appearances, and potential implications in construction projects.



Advantages of using fly ash bricks

Using fly ash bricks offers numerous advantages, including :
 

1. Environmentally friendly

Fly ash bricks are the champions of environmental consciousness. By utilising industrial waste materials that would otherwise burden landfills, they pave the way for a greener future.
 

2. Energy efficient

With fly ash bricks, energy savings come naturally. Their production process demands less energy compared to the traditional red bricks, resulting in reduced greenhouse gas emissions and a lighter carbon footprint.
 

3. Lightweight

Fly ash bricks boast a featherlight quality that makes them a breeze to handle and transport. You'll save both time and effort during construction, making your project progress smoother than ever.
 

4. Cost-effective

These cost-effective marvels offer exceptional value for your investment, ensuring your budget stays intact without compromising on quality.
 

5. Good insulation

Fly ash bricks bring the power of insulation to your construction project. Their remarkable insulation properties help regulate temperature, reducing energy consumption and keeping your space comfortable all year round.
 

Properties of fly ash bricks

These properties of Fly ash bricks remarkably contribute to their popularity and suitability for construction projects :
 

1. Compressive Strength

Fly ash bricks boast an impressive compressive strength ranging from 75-100 kg/cm2. They're not just bricks; they're the backbone of load-bearing structures that stand tall against heavy loads without buckling.
 

2. Fire Resistance

The high melting point and non-toxic nature of the bricks ensure that they won't release harmful fumes when exposed to fire. Feel secure in your building, knowing that fly ash bricks offer exceptional fire resistance.
 

3. Sound insulation

The fly ash bricks have excellent sound insulation properties, effectively absorbing intrusive noise vibrations. With this the space becomes calm, shielding you from the chaos of the bustling city or the busy neighbourhood.
 

4. Durability

Fly ash bricks are built to last, weathering the storm of time with resilience. They stand strong against weathering, erosion, and chemical attacks. From heat to rain, fly ash bricks retain their structural integrity.
 

5. Eco-Friendliness

Fly ash bricks embody sustainability at its finest. Crafted from industrial waste materials like fly ash, they breathe new life into what would have been destined for landfills. Fly ash bricks actively contribute to reducing environmental pollution and minimising your project's carbon footprint.

 

With fly ash bricks, construction goes beyond conventional limits.

 

Also Read : Types of AAC Blocks





When it comes to choosing between fly ash bricks vs red bricks, it's all about finding the perfect fit for your project. It's essential to weigh the advantages and disadvantages of each type of brick and review these by a test on bricks. After all, you want your construction project to be safe, long-lasting, and as efficient as possible. So, take the time to consider which type of brick suits your needs best. The more you know about your materials, the better equipped you'll be to make informed decisions about your construction project.



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