Advantages Of Fly Ash Bricks: – 1. Appearance: The appearance of fly ash bricks is very attractive due to their pleasing color like cement, uniform size, and smooth finish. Due to uniform size, mortar required for walls and plastering reduces almost by 40-50%. 2. Strength: The compressive strength of fly ash bricks is very high (9-10 N/mm2). Due to high strength no breakages/wastages during transport and handling. The lower thickness of joints and plaster reduces cracking in plaster. These bricks do not cause any extra load for the design of structures and provide better earthquake resistance.
It improves the strength over time and offers greater strength to the building.3. Thermal Properties: The thermal conductivity of fly ash bricks is 0.90 – 1.05 W/m2. They absorb less heat. The pozzolanic reaction between fly ash and lime produces less heat. It keeps your building cooler in summer, hence most suitable for Indian climates.4.
Durability: These bricks are highly durable and less permeable. The lower permeability can efficiently reduce the effect of efflorescence on bricks, These bricks are less porous, absorb less water, and reduce dampness on the walls. It is also highly resistant to attack by mild acid, water, and sulfate.5.
Sound Insulation: Construction with these bricks provides decent sound insulation to the building.6. Fire Resistance: These bricks are highly fire-resistant compared to normal clay bricks.7. Sustainability: Fly ash bricks are environmentally friendly as they are made of waste materials that come from the combustion of coal in thermal power plants.
There is no pollution or environmental damage, considered as a white category product.8. Buildability: These bricks have easy workability and absorb less water. Unlike clay bricks, they do not require soaking in water for 24 hours. The sprinkling of water before use is enough.
- The construction technique is same as clay brick construction and does not require any extra training for the masons.9.
- Availability: These bricks are generally available closer to the thermal power plants.
- However, finding dealers in all major cities and towns wouldn’t be a problem.10.
- Cost: The same number of fly ash bricks will cover more areas than clay bricks.
Consumption of mortar is also low. Requires less labour. The cost is approximately 30% lower than clay bricks.11. Applicability: Due to their lightweight, these bricks are suitable for multi-storey structures. Less weight means less stress on the building.
- These bricks can be used in load-bearing external walls in low/mid structures, non-load bearing internal walls in low/mid structures, and non-load bearing internal or external walls in highrise buildings.
- Disadvantages Of Fly Ash Bricks: 1.
- Not all fly ash is suitable for construction, those are produced in power plants usually compatible with concrete, while others may need beneficiation.
It is very important to use only high-quality fly ash to prevent negative effects on the structure.2. If not made properly, it has no strength and is not suitable for construction. Poor quality bricks have negative impact on concrete. It can increase permeability, resulting in damages to the structure.3.
Bonding with concrete is lower due to the smooth finish.4. Limitation in size. Only modular size bricks can be produced. The larger size will have more breakages.5. It is only suitable for subtropical areas, or where the climate is warm because these bricks do not absorb heat. But in winter season it is not helpful.
Fly Ash Bricks Uses: Fly ash bricks are used in
Multistorey structures.High-rise buildings.House construction.Factories.Warehouses.Power plants.
Fly Ash Bricks Vs Red Bricks: Here are their differences
|Fly Ash Bricks||Red Bricks|
|These bricks are made in moulds hence are always of uniform shape.||Red bricks are uneven shapes and sizes as they are hand made.|
|Uniform colour with pleasing appearance.||Non uniform colour because the colour of these bricks depends on soil.|
|Plastering is not required due to smooth finish.||Plastering is always required.|
|Lightweight.||Heavier than fly ash bricks.|
|The compressive strength of fly ash brick is around 100 kg/cm2||The compressive strength of clay brick is around 35 kg/cm2.|
|They can absorb more vibration than clay bricks.||Cannot absorb heavy vibration.|
|Stronger and denser than normal red bricks.||Slightly less stronger.|
|Less mortar requirement than clay brick construction||Mortar requirement is high.|
|Less breakages and wastages than red clay bricks.||Clay bricks are brittle material, more breakage and wastages.|
|Less porous, does not require soaking in water before use.||Require soaking in water before use.|
|The cost is 30% lower than clay bricks||Costly than fly ash bricks.|
|More environment-friendly as they are made of waste materials||Not environment friendly. But red bricks are made of clay collected from fertile land topsoil and chimney required.|
What is the problem with using fly ash bricks expand?
Because Fly Ash bricks have low mechanical strength. The another major factor is the limitation on size of fly ash bricks. Only small and modular sizes of bricks are possible. Larger size of bricks have will have more breakages.
Which one is better fly ash or normal brick?
In all aspects fly, ash bricks are better than clay bricks. They are environment-friendly because the maximum constituent is ash and flies ash bricks have greater strength as compared to red bricks.
Which is better clay bricks or fly ash bricks?
Differentiate between Clay Bricks and Fly Ash Bricks – The characteristics that differentiate between these bricks are –
Fly ash bricks are of cement color while the colour of Clay bricks differs from burnt red to light brown depending on the type of clay used for manufacture of the bricks.Fly Ash bricks are cast in moulds hence are always of uniform shape. Clay bricks are handmade causing slight difference in their shape and size.Fly Ash bricks have a very smooth finish hence plaster is not required on the bricks to create a smooth surface. Clay bricks require plastering.Clay bricks are more porous than Fly ash bricks.Fly ash bricks are lighter in weight and less costly than Clay bricks.Fly ash bricks are made of waste materials which come from the combustion of coal in thermal power plants. Clay bricks are made of clay which is collected from fertile land or the top soil. This is the prime reason that makes Fly ash bricks more preferable than Clay bricks.
Suggested Read: Advantages and Disadvantages of Fly ash in Concrete Clay Bricks Fly Ash Bricks
Is fly ash brick eco friendly?
What is Fly Ash Brick? – Ash Brick is a new building material that emerges from Coal Ash. It is considered to be green or eco-friendly as it can help curb carbon emissions in the construction industry as is made of recycled material.
Does fly ash make concrete weaker?
Introduction – The use of fly ash in portland cement concrete (PCC) has many benefits and improves concrete performance in both the fresh and hardened state. Fly ash use in concrete improves the workability of plastic concrete, and the strength and durability of hardened concrete.
Improved workability. The spherical shaped particles of fly ash act as miniature ball bearings within the concrete mix, thus providing a lubricant effect. This same effect also improves concrete pumpability by reducing frictional losses during the pumping process and flat work finishability. Figure 3-1: Fly ash improves workability for pavement concrete. Decreased water demand. The replacement of cement by fly ash reduces the water demand for a given slump. When fly ash is used at about 20 percent of the total cementitious, water demand is reduced by approximately 10 percent. Higher fly ash contents will yield higher water reductions. The decreased water demand has little or no effect on drying shrinkage/cracking. Some fly ash is known to reduce drying shrinkage in certain situations. Reduced heat of hydration. Replacing cement with the same amount of fly ash can reduce the heat of hydration of concrete. This reduction in the heat of hydration does not sacrifice long-term strength gain or durability. The reduced heat of hydration lessens heat rise problems in mass concrete placements.
Benefits to Hardened Concrete. One of the primary benefits of fly ash is its reaction with available lime and alkali in concrete, producing additional cementitious compounds. The following equations illustrate the pozzolanic reaction of fly ash with lime to produce additional calcium silicate hydrate (C-S-H) binder:
|Cement Reaction:||C 3 S +||H → C-S-H + CaOH|
|Pozzolanic Reaction:||CaOH +||S → C-S-H|
|silica from ash constituents|
ul> Increased ultimate strength. The additional binder produced by the fly ash reaction with available lime allows fly ash concrete to continue to gain strength over time. Mixtures designed to produce equivalent strength at early ages (less than 90 days) will ultimately exceed the strength of straight cement concrete mixes (see Figure 3-2).
Figure 3-2: Typical strength gain of fly ash concrete.
Reduced permeability. The decrease in water content combined with the production of additional cementitious compounds reduces the pore interconnectivity of concrete, thus decreasing permeability. The reduced permeability results in improved long-term durability and resistance to various forms of deterioration (see Figure 3-3)
Figure 3-3: Permeability of fly ash concrete.
Improved durability. The decrease in free lime and the resulting increase in cementitious compounds, combined with the reduction in permeability enhance concrete durability. This affords several benefits:
Improved resistance to ASR. Fly ash reacts with available alkali in the concrete, which makes them less available to react with certain silica minerals contained in the aggregates. Improved resistance to sulfate attack. Fly ash induces three phenomena that improve sulfate resistance:
Fly ash consumes the free lime making it unavailable to react with sulfate The reduced permeability prevents sulfate penetration into the concrete Replacement of cement reduces the amount of reactive aluminates available
Improved resistance to corrosion. The reduction in permeability increases the resistance to corrosion.
Figure 3-4: Fly ash concrete is used in severe exposure applications such as the decks and piers of Tampa Bay’s Sunshine Skyway Bridge.
Which of the following is disadvantage of fly ash?
Disadvantages of Fly Ash –
The quality of fly ash can affect the quality and strength of Cement concrete.Poor quality fly ash can increase the permeability of the concrete and cause damage to the building.
Hence the advantages of using fly ash in concrete are more than the disadvantages. We have offers of these Glass Fittings & Hardware ( Glass Connector, Glass Door Handles, Glass Door Hinge, Glass Door Locks, Patch Fittings ) with high discount. You can choose multiple types of glasses from top brands.