Hello Friends ,
Do you know how to calculate the material required for constructing 1 CuM of brick masonry ? This information is useful for :
- Calculating the material to be brought for the brick masonry.
- Doing rate analysis
- Making a detailed estimate
Today we shall solve one example so that you are able to understand each step with utmost clairity.
Here we go.
Hope you are able to properly get the steps .
In case of any queries , please do write to me through this blog.
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Hello Friends ,
Can you solve this example ?
Once you have solved this , have a look at the following slides for the correct solution .
Best of luck !
Hope your solution matches with the solution given above.
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Answer by Rakshita Nagayach:
The advantages of Porotherm Thermo bricks are plenty and are as follows:
- These bricks have a very small value of rate of heat loss (generally called as U-value), nearly 0.6 W/m²K whereas that for a solid clay brick and a solid concrete block is 1.8 W/m²K and 2.0 W/m²K respectively. The U-value must be as low as possible as then less energy is required for cooling or heating the indoors of a building.
- These are noteworthy Energy savers as they eliminate the need of external insulation such as cavity walls and thus save spaces. Also the need for air-conditioners in summers and heaters in winters is decreased.
- These bricks have already been burnt (at 1000 degree Celsius) and are thus immune to fire. They just get baked in case of fire, without releasing any toxic gases or harmful vapours. They have high fire ratings which means there is pretty good amount of time to evacuate the building in case of fire before damage occurs.
- They are 60% lighter than the conventional clay/concrete bricks and thus are easy to handle. This leads to lesser dead load as well as increase in speed of construction.
The few disadvantages are:
- The compressive strength of Porotherm Thermo bricks is slightly above 3.5 N/mm² whereas that of Class I clay bricks is 7 N/mm² (Based on British Standard 3921:1965). This restricts the use of Thermo bricks in huge structures.
- The water absorption is about 15% in case of Porotherm Thermo bricks whereas it is generally preferred to be 10% in clay bricks as more absorption leads to salt attacks and thus reduces the strength of the structure.
- These bricks have a density of approx. 694 to 783 kg/m^3 which is pretty less than that of clay bricks (which ranges from 1400kg/m^3 to 2100 kg/m^3). Thus the Porotherm bricks cannot be used, specially for foundation and base-slab works in areas of high round water table as they would not be able to resist the negative pressure of water and capillary action.
Here’s how Porotherm Thermo bricks are used:
Sources: POROTHERM Clay Building Bricks
Image source: Google Images
What are the pros and cons of Porotherm Thermo Bricks? How much difference in temperature does it result in?
Answer by Sanjay Saini:
The actual fact is CLC/ AAC blocks are pretty popular in market leading builders and architects. All firms that have well learned and technically updated team of planning engineers and execution engineers are using the modern blocks wherever possible. It is probably the common and not so updated team of engineers, architects and builders who are keeping away from using AAC/ CLC blocks. The very fact that all major cement companies like Ultratech, JK etc. and many hitech entrepreneurs have entered into AAC blocks manufacturing shows that they see a vast market in near future.
Lack of necessary communication and not availability of correct marketing force at ground who can convince the local level builders and contractors is missing very much in the entire scenario.
The decision making authority needs to get convinced about the various advantages of using the AAC/ CLC blocks. The reason for adopting AAC/ CLC blcoks would be different for different kind of people however the advantages are same for all.
First advantage is the blocks are very unifirm in shape and are normally equal to six to ten numbers of normal modular brick of 4x4x8 inches. This translated into uniformity in brickwork, in both inside and outside faces of wall. Plus the added advantage of fast masonry. One can achieve upto five times fast progress with ACC/ CLC blocks in comparison to normal bricks.
The uniform shape requires very thin mortar layer between blocks, the joinery mortar is as alll know is a fairly costly material being 1:4 mix of cement and sand. The even surfaced wall also requires very thin plaster on both sides which is also a very cement intensive material and thus lot of cost saving is done. Many builders are nowadays preferring “Gypsum Plaster” directly over blocks wall, thus plaster, putty is done in a single activity one needs to just get on with painting and finish the unit.
The long term benefit of using AAC/ CLC blocks one obtains is by virtue of its being very good thermal insulator. If the outside temperature is say 36 degrees then the normal brick wall will maintain around 32 degrees in room, whereas the AAC/ CLC made room will have temperature around
27 degrees, the cooling – heating cost is one of the major cost component in monthly maintenance expenses if any building. Saving on cooling/ heating in entire lifetime of building will be tremendously beneficial.
In buildings adjoining to traffic areas like shops/ offices in city center where noise pollution is huge, or in office blocks of industries where sound is unavoidable AAC/ CLC blocks can cut the noise off very very efficiently.
Any construction engineer knows whats happens to normal brick walls when groves are cut in masonry for electric and plumbing conduits. The wall almost rips off leaving lot of cracks behind. The hand chiseling or machine cutting destroys the bond between the already weak clay bricks, as a result after the plaster is done many a times cracks appear above conduit lines. The scene with AAC/ CLC blocks is entirely different. The blocks get cut very easily and the joinery does not gets disturbed at all.
Normal burnt clay bricks are very disastrous to environment not only the fertile top soil is depleted but lot of carbon mono oxide is released in environment. The brick industry is told to be the third most coal consuming industry after power and steel. The Supreme Court has given directives for phasing out of burnt clay bricks.
So finally its just matter of understanding and estimating the benefits that AAC/ CLC blocks offer. I am sure the blocks will rule the world in coming years.
Why are CLC/AAC blocks/bricks not replacing the traditional burnt clay bricks totally?