In the world of construction, the choice of materials plays a pivotal role in determining the longevity and aesthetic appeal of a structure. Glazed bricks, with their ceramic-coated exteriors, have gained popularity for their blend of attractiveness and durability. This article examines the features, advantages, and considerations surrounding the use of glazed bricks in the construction industry.
Features of Glazed Bricks
Glazed bricks are distinctive for several noteworthy features:
1. Dual Firing Process
These bricks undergo a two-stage firing process in kilns. Initially, they are fired during their creation, and subsequently, the ceramic coating is fused onto the brick’s surface. This dual firing enhances their strength and imperviousness.
2. Diverse Color Options
Glazed bricks are available in a wide range of standard and custom colors, enabling architects and builders to achieve their desired aesthetic outcomes.
3. Impervious Surface
The glazed surface forms an impervious layer, rendering the bricks highly resistant to impacts, abrasion, staining, graffiti, and damage from water and frost. This resilience ensures that they can stand the test of time for generations.
4. Standard Specifications
The American Society for Testing and Materials (ASTM) provides detailed specifications for glazed bricks in ASTM C 126-99. These standards outline the characteristics and quality requirements of ceramic glazed structural clay facing tile and facing brick.
5. Inseparable Ceramic Glaze
The ceramic glaze is fused to the brick’s body at temperatures exceeding 1500°F, creating a seamless and durable bond.
6. Variety of Grades and Types
ASTM standards classify glazed bricks into different grades and types, such as Grade S (Select), Grade SS (Select sized or ground edge), Type I (Single-faced units), and Type II (Two-faced units), each suitable for specific applications.
7. Compliance with Standards
ASTM C 126 and C 1405 specify key properties of glazed bricks, including imperviousness, opacity, resistance to fading, crazing resistance, flame spread, hardness, and abrasion resistance. These properties ensure quality and durability.
8. Load-Bearing Capability
Glazed masonry units can be used for both load-bearing and non-loadbearing wall applications, providing versatility in construction.
9. Resilience to Harsh Weather
Despite their weight due to the additional ceramic coat, glazed bricks are capable of withstanding harsh weather conditions, including freezing temperatures and warmer regions.
10. Weight Variability
The weight of glazed bricks varies depending on factors like raw materials, size, manufacturing process, and corning. ASTM C 1405 provides average weight requirements for glazed bricks.
Considerations in Glazed Brick Masonry Construction
To ensure the durability and longevity of glazed brick installations, several key considerations must be taken into account:
1. Effective Water Management
Effective water management is crucial for the durability of glazed bricks. Saturated areas should avoid using glazed bricks, and a drainage system should be designed to channel water away from the wall system if used in such conditions.
2. Mortar Joint Protection
While the glazed surface is impervious to water, mortar joints can deteriorate when exposed to frequent moisture. Hence, a vented drainage-type wall system should be incorporated to prevent moisture infiltration.
3. Foundation Design
The weight of glazed bricks exceeds that of standard bricks, necessitating special consideration in foundation design to accommodate this additional load.
Advantages of Glazed Bricks
The advantages of using glazed bricks in construction are numerous:
1. Versatility
Glazed bricks come in various shapes, sizes, colors, and finishes, providing architects and builders with a wide range of design options.
2. Low Maintenance
These bricks are easy to clean with simple soap and water, requiring minimal maintenance over their lifespan.
3. Fire Resistance
Due to their composition of burned clay and fused ceramic, glazed bricks exhibit high resistance to fire, enhancing the safety of structures.
4. Durability
The ceramic layer enhances the resilience and endurance of glazed bricks, ensuring a long-lasting construction material.
5. Aesthetic Flexibility
Glazed bricks can be customized to match the aesthetics of their surroundings, allowing for seamless integration into various architectural styles.
However, it’s important to note that the production process of glazed bricks is energy-intensive and costly due to the high temperatures and expensive glaze material involved.
In conclusion, glazed bricks have emerged as a popular choice in the construction industry, offering a balance of aesthetics and durability. By understanding their features, advantages, and construction considerations, builders and architects can make informed decisions when incorporating these distinctive bricks into their projects.