For a 10 x 4 m RC slab, which is a better option, a PT slab or a flat slab? by Santosh Kulkarni https://www.quora.com/For-a-10-x-4-m-RC-slab-which-is-a-better-option-a-PT-slab-or-a-flat-slab/answer/Santosh-Kulkarni-37?share=06e22f74&srid=zM5g
What is the difference between a deck slab and a solid slab? by Santosh Kulkarni https://www.quora.com/What-is-the-difference-between-a-deck-slab-and-a-solid-slab/answer/Santosh-Kulkarni-37?share=df35b072&srid=zM5g
Dear Friends ,
Let us solve the query of one of the readers today.
This is the query :
In fact , there are two queries here :
- When do we use Plain Concrete in a footing ?
- Ground Water seepage during excavation ?
Let us solve these queries one by one.
First query is about the Plain cement Concrete .
Please have a look at the section of the Footing as given in the RCC drawing :
The PCC is marked here with Red :
Now have a look at the base of a pit . This is how the surface shall be at the base of the excavation :
It shall be very clumsy to lay the rebars on such a muddy surface. Right ? Thats why we provide a certain thickness of plain cement concrete here . This concrete is also known as the ” LEVELLING COURSE “.
So the Levelling course is a layer of Plain cement concrete which is given so that we get a good working surface for laying the footing properly.
Now have a look at the leveling course laid on a site :
Next step is to lay the Rebars of the Footings :
Parallely , the shuttering for the footing is also fixed on the Levelling course.
Now we do casting of the Footing so that it becomes the RCC footing .
Hope the first query is clarified.
Now second query pertains to the Water logging during excavation.
You can have a condition like this on the site :
So what do we do in such a case ?
We have dewatering pumps and take out the water before laying the Levelling course :
There might be a case like this also :
So now , may be we shall have to wait for a dry spell so that this water either gets absorbed in the soil below or is evaporated.
In a situation , when the excavated pit is not completely dried, it shall not be possible to lay the plain cement concrete in the mud.
What do we do then ?
In such a case , we shall have to do Boulder solling so that we get a good ,
solid working surface .
Look at the stake of Boulders which are also known as Rubble or Stone :
These boulders , when laid in the base of a pit , shall look like this :
After this , the levelling course is laid in plain cement concrete. This is followed by the RCC footing.
Hope both the queries are clarified now.
Thank you for asking the queries .
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How much cement and steel are required for 50×23=1150 square feet and thickness of 4″? by Santosh Kulkarni https://www.quora.com/How-much-cement-and-steel-are-required-for-50%C3%9723-1150-square-feet-and-thickness-of-4/answer/Santosh-Kulkarni-37?srid=zM5g&share=5d914961
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The design and selection of a particular type of foundation is a work of the RCC consultant The construction person must know the background so that the interaction with the designer is easy. Read this article so that you know the basics.