Red Bricks are common building materials. Red bricks are not only one of the oldest but also the most extensively used building materials worldwide. These building materials are the most popular and leading construction material because it is cheap, durable and easy to handle and to work with.
AAC blocks are one of the major achievements of the 20th century in the field of construction. It is a revolutionary material offering a unique combination of high durability and strength, low weight and superior ecological green features.
AAC Blocks and Red Bricks both are important building materials for constructing walls. Red bricks & AAC blocks are used in walls as per their properties, availability and cost. Hence, here we give you a brief comparison of Red Bricks & AAC Blocks to help you make the right choice.
Courtesy - 123rf
- A Red brick is a block, or a single unit of a ceramic material used in masonry construction, usually stacked together or laid using various kinds of mortar to hold the bricks together and make a permanent structure.
- Bricks are typically produced in common or standard sizes in bulk quantities.
- AAC Blocks are lightweight building materials cut into masonry blocks or formed larger planks and panels.
- AAC Block is relatively uniform when compared to other wall unit and does not contain coarse aggregate phase.
02. RAW MATERIAL
- It is made by mixture of clay(alumina), sand, Lime, iron oxide and Magnesia
- Natural soil is used for Production of Bricks. Hence ultimately it will vary depending upon the quality of local soil, i.e. Top soil of Earth Crust.
- It is made from the mixture of fly ash, cement, lime, gypsum and an aeration agent.
- The Fly ash used in AAC Blocks production is eco-friendly & Cement is used in very little Quantity.
- The Problem of fly ash utilisation is solved by the use of fly-ash in AAC Block. This was a major problem till day.
01. As a Structural Unit:
Red bricks are strong, hard, durable, therefore they are used as a structural material in different structures such as
- Arches and cornices
02. As an Aesthetic and Finish Surface:
Bricks are used as per its different colours, sizes and orientations to get different surface designs. As an aesthetic material brick can be used
- As Facing Bricks
- Architectural Purposes
- Exposed practice work
- AAC Block can be used to build internal and external walls.
- It can also be used as load bearing and non load bearing walls.
- Raw material is easily and cheaply available. So it is economical.
- Red Bricks are low maintenance, permanent, hard and durable building material.
- Compressive strength is good enough for ordinary construction.
- Different orientations and sizes give different surface textures
- Demolishing of brick structures is very easy and less time consuming.
- It is reusable and recyclable.
- Highly fire resistant.
- AAC blocks are very easy to handle and ordinary tools are used for cutting.
- AAC blocks are available in large sizes and hence less no of joints. This ultimately results in faster construction on site and less consumption of cement.
- Earthquake forces are proportional to the weight of building and it ultimately reduces the load on buildings, and hence less steel in case of RCC structure.
- AAC blocks are made from an inorganic material which helps to avoid termites, damages or losses.
- Saves steel and concrete due to the reduction in dead weight.
- Increase in floor area due to a reduction in the size of columns and thickness of the wall.
- Easy to transport on upper floors.
- Time-saving in construction
- AAC blocks have a very low thermal conductivity which keeps interior remain cool in summer and warm in winter.
- AAC blocks reduce interior temperature variation maintaining pleasant and healthy temperature for habitant.
- AAC blocks reduce the energy cost of air-conditioning to a great extent due to its thermal property.
- AAC blocks are appropriate for fire rated application for desired safety.
- One AAC block of size (600 x 200 x 100 mm) is equivalent to 6 bricks hence it reduces 50% of joints resulting in saving of mortar up to 48%. In the case of 150 mm or thicker block masonry, the mortar saving is even more due to avoidance of vertical joint in conventional brick masonry.
- Minimal wastage of AAC blocks.
- It is environment-friendly and also saves water. Hence it is popularly used as a green product.
- The production cost of AAC Blocks is expensive but on the whole project cost decrease.
- Time consuming construction
- Red Bricks cannot be used in high seismic zones for load bearing structures.
- A red brick absorbs water easily so Efflorescence occurs due to the presence of salt in water.
- Rough surfaces of bricks may cause moulds growth if it is not properly cleaned.
- Continuous use of Red bricks in construction will lead to extensive loss of fertile top soil and hence potential agricultural land.
- Red bricks are heavy in weight so that the structure needs to withstand greater weight, and hence construction cost increases.
- Big damage to environmental and loss of fertile land due to use of clay soil excavation for making of bricks.
- The production cost per unit for AAC Block is higher.
- Plaster sometimes does not stick properly because of its smooth surface. Needs care during production itself, so that surface is not very smooth.
06. IDENTIFICATION ON SITE
- Its colour is Red.
- Colour of AAC Block is Grey.
(a) Size Available in Market
Standard modular size:
- 190 x 90 x 90 mm
- 190 x 90 x 40 mm
Standard Non modular size:
- 230 x 110 x 70
- 230 x 110 x 30
These sizes are more popular in india.
However, it defers from manufacturer to manufacturer.
(b) Variation in Size
- Red Bricks are not accurate in size, a largely from area to area.
- The AAC Blocks are accurate in size because it is produced by wire cut technology and is a factory product.
(c) Dry Density
- 1600-1720 kg/m3
- 1721-1820 kg/m3
- 1821-1920 kg/m3
- 451-550 Kg/m3
- 551-650 Kg/m3
- 651-750 Kg/m3
- 751-850 Kg/m3
- 851-1000 Kg/m3
- 2.5 – 3.5 Kg
- It will depend on density & size of brick.
- 3 – 4 kg
- It will depend on Density & size of Block.
(e) Compressive Strength
- 30-35 N/mm2
- Strength is defined as a capacity to resist force or pressure.
- 30-35 Kg/cm2
(f) Water Absorption
- Water absorption of brick should not be more than 20% of its weight.
- Water Absorption of this block should not be 10% its weight.
(g) Fire Resistance
- 100 mm thick wall can resist fire for up to 2 hours.
- 100 mm thick wall can resist fire for up to 4 hours.
(h) Thermal Conductivity
- 0.6- 1.0 W/mk
- The amount of heat transfer from a specific material is called its thermal conductivity.
- The thermal conductivity of brick is high, and hence heat transfer from brick is more than AAC block.
- 0.21 – 0.42 W/mk
- Thermal conductivity of block is lower and less heat transfer from the block.
(i) Moisture Resistance
- Moisture Resistance of Red Brick is Average.
- Moisture resistance will depend on water absorption of brick and proportion of cement mortar.
- 100/115 mm wall will not have adequate moisture resistance. If poor, it will make walls damp & wet.
- Moisture resistance of AAC block is better than the Red Brick.
- AAC block consists of unconnected micropores which prevent the capillary transport of moisture over a long distance.
(j) Sound Insulation/Noise Transmission
- Sound insulation is defined as the capacity to reduce sound transmission by building elements.
- Sound transmission also depends upon the thickness of the wall.
- The brick wall has good sound insulation property due to its dense structure.
- 45 db sound is reduced by 150 mm and 50 db sound is reduced by 230 mm walls.
- The AAC block has good sound transmission property due to the presence of air voids.
- 40-45 db sound is reduced for 200 mm thick.
(k) Termite Resistance
- Red bricks are not termite resistant as they are made from clay which is an organic material.
- AAC blocks are insect resistant, inorganic and solid wall construction material.
- AAC block does not allow the spread of termites and pests and hence increase the life of wall.
(a) Labour Output
- The speed of red Brick work will be slow as compared to Block work.
- The Speed of work will be double than that of clay brick work.
(b) Carpet Area
- Less carpet area available compared to block work.
- More carpet area available due to less thickness of block.
- Red bricks are used for both load bearing and Non-Load Bearing walls.
- AAC Blocks are recommended for high-rise buildings because it substantially reduces total dead load of building
(d) Mortar Consumption
- Requires more mortar due to irregular surface & more number of joints.
- Requires less mortar due to flat and even surface & less number of joints.
(e) Speed of Construction
- The speed of construction of the brick wall is slower than the block construction.
- Speedy construction of wall due to the bigger block size, light in weight and less number of joint.
(f) Water usage during Manufacturing
- Requires more water for curing and hence high amount of electricity bill and labour cost.
- Block is cured by steam and block masonry also requires less curing hence less water is used and there is saving in electricity bill.
(g) Breakage & Utilisation
- Average 10 to 12 % breakage happens on construction site, So 100% utilisation is not possible. Even at some place, due to the poor quality of bricks, wastage goes up to 33%.
- Negligible breakage almost 100 % utilisation is possible.
- In monsoon, Stock at the site is compulsory which blocks large working area on the site otherwise work will get stopped.
- Readily available at any time & in any season at a short notice, so no storage required.
- Generally present.
- Efflorescence occurs due to presence of salt in water and sand.
- Efflorescence occurs through mortar and water.
(a) Construct a 1 cum Wall Cost
- 1 cum brick work cost around 3100/- in india.
- 1 cum block work cost around 2800/- in india.
(b) Structural Cost
- No such saving is possible.
- Steel saving up to 15% & Concrete saving up to 7%.
- AAC Blocks reduces the load on foundation due to its light self-weight and saves consumption of steel. Hence reduces the Structural Cost.
10. ENVIRONMENT IMPACT
(a) Soil Consumption
- One clay brick consumes 3.2 kgs of top fertile soil.
- Zero soil Consumption. The basic Raw material of AAC Block is fly ash. Which otherwise has a disposal problem.
(b) Green Product
- Red Brick is not a green product.
- On the country, it is the enemy of green.i.e.environment.
- Red Bricks are made from the clay which is naturally available material but it reduces the top fertile soil cover.
- AAC Blocks are made from a non-toxic material which does not harm the environment. Using it reduces the industrial waste, and it also decreases greenhouse gas emissions.
- During the manufacturing process, Waste of the AAC Block is recycled and used again. This waste is made from the cutting process.
- Hence AAC Blocks are a Green product.
(c) Earthquake Resistance
- Red Bricks have resisted average earthquake forces because the density of brick is more than AAC Block.
- Earthquake forces are proportional to the weight of the building. AAC Blocks reduce the weight of building so it increases the safety against earthquake.
This comparison of AAC blocks Vs Red bricks will help you in making precise selection for the walls of your home.Red Bricks are made from the natural soil. If this natural soil is used continuously for construction. Time will come when natural resources will be scare. Due to this reason block are used for constructing a wall. Using AAC block is very advantageous because it not only conserves the environments; it saves energy and provides safety to life.