Good evening friends.
Thank you for giving a great response to this series on unemployed civil engineers.
This is the 4th session and today we shall be talking about concrete.
Concrete can be planned either as a Design mix or a Nominal mix.
Design mix is more accurate since each of the constituents has been properly tested in the laboratory.
the Nominal mix is basically an imperial method of design. It assumes that the cement is of Grade 33 whereas now a days , this grade is not manufactured.
What we see at site is either Grade 43 or Grade 53 OPC .
Concrete and water is yet another topic where we need to focus.
Remember one thing : Strength of concrete and water added in the concrete are inversely proportional to each other.
Workability is one word which needs clarity.
It is the ease with which you can place or finish the concrete.
Workability means the flow of concrete.
The flow of concrete can be measured by the slump value.
Concrete can be manufactured at the site or it can ordered directly from a batching plant which is also known as a ready mix concrete plant or RMC plant.
First video is about the transit mixer .
The transit mixer is a truck which is mounted with a drum and through this TM , the concrete is transported or supplied to your site.
Another video shall show you how the casting is done in Hammered piles on the banks of the River Godavari. You can first see the concrete being shifted by trolleys to the Piles and then lowered down with the help of tremie pipes.
Both the videos have proper captions so that each frame and object is understood to the viewer.
Please remember to read the description below this video. you shall find plenty of links to the relvant material on concrete.
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Ok friends, so now time for enjoying the videos.
Bye Bye & take care
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Other Resources for you on concrete :
RCC comprises of Form work , concrete and Rebars.
We talked about form work in previous session:
Now let us talk about concrete.
Concrete can be specified by either grade or by the mix.
If you are wondering ,how to find the materials for a given grade of concrete ,
The flow of concrete can be measured by the slump value.
The concrete can be tested using the specimen concrete cubes.
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