Blog Performance

Dear Reader ,

YOUR continued support  is quite astounding !

Now your blog has 277  followers and

has 26,278  page views from readers from more than 45 countries.

This is the 201st post of  your blog .

Compare this with the  Status as on 14th Dec 2014 :

Now your blog has 70 followers and has 1540 happy readers across 26 countries.

We have 56 posts now..and counting ….the response was simply tremendous.

The earlier record of 56 Page views in a day was shattered by the new record of 451 page views in a day .It happened on 14th Dec 2014 , when the blog got transformed into a web site , 

Here are a selected messages  received through WhatsApp :

[ Updated on 2nd Jan 2015 ]

Yes sir.. I visited ur site.. it is very nice n useful !!

Karan Patil

KARAN PATIL

Congratulations Sir, we are very glad when we get to know that you  have created website about construction..

There is huge source of knowledge for us.. Thanks sir  and  we are also following your  blog

Chinmay Dighvekar 

Harshvardhan Pawar 

HARSHAVARDHAN PAWAR

CHINMAY DIGHVEKAR

Sir !! I congratulate you  for this great Step.. and good wishes always…
.. Sir

 

Ashok Sharma

 

ASHOK SHARMA

 

Sir Nice to hear from you after so long.. 
I have bookmarked the link.. 
Very informative.. Hope to meet you soon.. Congrats.. ;
Animesh  Patil

 

 

Great sir

 

Nikhil Jashnani.

 

 

I read your blog sir…it’s amazing 

 

Dinesh Sonawane

 

 

I just visited. It’s awesome:

 

Keshav Jadhav

 

Its very useful

 

Kunal Kharote

Material consumption for Concrete

Dear Readers ,

Do you know how happy am I today ?

One of my students has asked me this question through  a web site

Instead of directly answering him , what I have done is to present the complete calculations at this page.

The advantage ?

Oh, its quite simple. That student shall have his required answer and as a bonus , I am having this blog post which I can present to you . You can also go through this .

———————————————————————————————————————————————-

Thank you sir ! anticipating lot of guidance..

1 question.. If on site for 900 cft slab casting material ratio is M20 as per drawing but mixing on site is 3 tagari cement=1 bag of cement.. 6 tagari of sand… 7 tagari of aggregate. .
How to estimate how much cement sand aggregate required on such base (on tagari base 1:6:7) for 900 cft or in cum.. Looking forward for your response. .Thank u.

————————————————————————————————————————————————————Solution :

Data :
1.Volume of the slab : 900 Cft  .= 900/ 35.29 = 25.50 CuM.
2. Mix of concrete : M20
3. Actual mix at site :
1 bag of cement : 6 tagari of sand. : 7 tagari of aggregate.

4. 1 bag of cement = 3 tagari 
5.Actual ratio at site :
3 tagari : 6 tagari : 7 tagari
or , it can be written as :
3/3 :6/3 :7/3
or 1 : 2 : 2.33
6. Actual nominal mix at site : 1 : 2 : 2.33
7. Let is first calculate the cement , sand and aggregate required for 1 CuM of Concrete.
8. By dry mix method ,

Cement = 1.52 *28.8 /( 1 : 2 : 2.33) = 8.21 Bags
Sand = 0.3529 * 1.52 *2 /( 1 : 2 : 2.33) = 0.201 Brass of sand
Aggregate = 0.3529 * 1.52 *2.33 /( 1 : 2 : 2.33) = 0.234 Brass of Aggregate

9. Material constants :
Cement = 8.21 Bags
Sand =    0.201 Brass of sand
Aggregate = 0.234 Brass of Aggregate

10.Material consumption for 25.5 CuM ( 900 Cft ) of concrete :

Cement = 8.21*25.5 Bags = 209.36 Bags
Sand = 0.201*25.5 Brass of sand = 5.13 Brass
Aggregate = 0.234*25.5 Brass of Aggregate = 5.97 Brass

Box type waterproofing

Dear Readers ,

Some days back , we had a discussion regarding the construction of the  basements.

There we also reviewed , how exactly is the water proofing carried out.

We also saw what is meant by box type water proofing.

For quick reference , here is the link : Box type water proofing 

Going further , on the same topic, you can see this video where the author is explaining to the students ,

the importance of the box type water proofing .

[ This is in Marathi ]

here is the link for the video :Box type waterproofing

Would look forward for your suggestions

Thank you so much for your active participation in the blogging process.

Construction Videos

 Dear Friends ,

A picture is better than a thousand words . You already know this. Right ?

Going a step further , I have experienced that a video is much much better in explaining the technical concepts .

Specially , when it comes to the field of construction management , the importance of the videos is quite clear.

Because then you are actually seeing and perceiving the actual events as happening on the construction site.

With this in mind , the author has taken a decision to upload the videos which have been shot during the class room teachings or during the actual site visits with the students.

The videos, shall definitely provide you with a different perspective on the construction.

These videos can be watched on my channel

Santosh Kulkarni

I hope you shall appreciate this initiative .

Do keep sending me your feedback and

also your valuable suggestions on improving the content of this blog.

So , enjoy the recently uploaded video .

AAC Blocks Planning 

You tube channel 

Rate analysis for Stone Masonry :

Readers,

When I was standing in a car park , waiting for someone to complete the shopping ,

I got a Whatsapp message from one of my students , asking me for the Rubble masonry rates. He said he wanted to submit the quotation on the same day. There was no use of just giving him a rate which I remember because it has to match with the material and labour rates and profit margin expected by this person.

So , I had to make a rate analysis for the Rubble masonry .

I asked him to message me the basic rates which he promptly did.

I next 15 minutes , I completed the rate analysis and send back the entire analysis to him .

Thought I shall also share the same calculations with you for your quick reference.

 

RANDOM RUBBLE MASONRY USED IN THE COMPOUND WALL .
[ REAR PORTION ]

Part A : The data :

Cement: 300/bag

Aggregate:  2400/brass

Rubble : 1500/brass

Labour  :2000/brass

Sand 5500/ brass

You already know that : I brass = 100 Cft

Desired  Profit 25%

 

Specifications :

Rubble masonry Width 18″

for wall compound ht 3′ from ground level

 in cement mortar in ratio : ( 1:6 )

 

Material for 1 cum:

Cement : 300*(0.45*1.52*28.8)/7= Rs.844

Sand:   5500*0.3529*6*(0.45*1.52)/7= Rs.1138

Rubble: 2400*0.3529*1.25 = Rs.1058

Labour : 2000*0.3529= Rs.706

 

Total:                        Rs.3756

Profit:Add@ 25%:     Rs.937

                   Total:  Rs.4693 Rs/cum.

Or             Rs.133 per Cft.

 

PCC 1:4:8

Material for 1 cum:

Cement : 300*(1.52*28.8)/13 = Rs.1010

Sand:   5500*0.3529*4*1.52/13 =Rs.908

Aggregate: 2400*0.3529*8*1.52/13  = Rs.792

 Sub total:                     Rs. 2710

For Labour Add 40%    Rs.1084

Total :                            Rs. 3794

Profits Add25%               Rs.949

Total :  Rs. 4743 per Cum

Rs.   134 per  Cft.

  

Note :

1.You shall observe that the rate for Rubble masonry in cement mortar in CM 1 :6 and the rate for plain cement concrete in proportion 1:4:8 are  almost equal

2. The material wastage is a point on which I need to elaborate.

As such when we consider the factor 1.52 in the material calculations by dry mix method, we are already considering 2 % material wastage . In case you want a higher allowance for wastage , you may take the factor as 1.57 so that material wastage is 7%.

Take a small step at a time

Readers ,

Today I am just going to advise you only small thing .

Just follow this link.

My web site 

You shall find a a small but very effective suggestion to improve your performance.

Just visit this link

constructionqueries.in

I shall be looking forward to your feedback !

Most welcome to try this exciting method for self-improvement.

Water Tank Case study 01 :

Dear Readers ,

During the previous article , we saw ” How to find the size of Water Tank ”

[ Refer the articles :  Article 01 , Article 02 , Article 03 ]

We are quite happy to inform you that an Architect   from  Ajmer

has sent the following calculations.

[ On her own request , we are not publishing her name here ]

 Case Study 01 – A Bungalow. For Over head water tank.

Total Number of Residents – 4

Plot Size –  Not required for calculations.

Step -01: DETAILS

1. No of Units to be served by this water tank (U) , U = 1
2. Average members per unit (m) , m = 4
3. Average water consumption per person per day , W= 135 Liters / day
4. Water storage to be made for how many days (n) , n = 2
5. Buffer supply to be maintained in the tank (x%) , x% = 5%
6. Free board to be kept = 250 to 300mm ,  let’s assume  : 300 mm

Step – 02: Find out the capacity of water tank;

C =   n x w x m x U (litre)

C =  2 x  135 x 4 x 1

C =  1080 Lt.

Step – 03: Add for the Buffer storage in the tank @ 5%

C1 = 1.05(n x w x m x U)

=1.05 x 1080 litre =  1134 litres

C2 = 1.05 (n x w x m x U) litres /1000

= 1134/1000 = 1.134 Cu.M

Step -04: Find out the height of the water in the tank

h = water capacity in CuM/ area of the water tank (a x b)

Area of water tank is assumed as  ( 1m  x 1.5 m ) = 1.5 Sq.m  

= 1.134 / 1.5 =  0.75 m

Step -05 Find out the height of the water tank:

H = h + free board

= 0.75 + 0.300  = 1.05 m

Step -06  Basic Internal size of the water tank:

Size : 1m x 1.5m x 1.05 m

Step -07 To find the out size of the water tank  :

RCC wall thickness = 100mm

RCC slab base thickness = 100mm

RCC top slab = 100mm

a = 1+ 0.10+0.10 = 1.20m

b= 1.5+0.10+0.10 = 1.70m

H = 1.05 +0.1+0.10 = 1.25m

Overall size of the water tank :   1.2 m x 1.70m x 1.25m

Water tank ,free board, Buffer

Readers ,

Before we take up an actual case study for the water tank size, these are a few clarifications .

Please refer to the following articles :

1.Water tank capacity

2. Water tank size

This is  the additional information :                                                                                                                                           1.Free board : This is a space kept between the top of water level and the bottom of the roof slab of the water tank. Or , the depth between the overflow pipe and the base of the roof slab. Or in another words , what is the clearance maintained between the maximum water level and the roof slab.                                                                  You shall ask me what is the basic purpose of this extra space ?                                                                              These are the objectives : 

• Safety : During maintenance if a person is inside and if the cover is closed . Then the person can survive by keeping the head in the space between the roof slab and water .
• Air ventilation : There shall always be free & fresh air on the top of water.
• Preventing the water from touching the top slab : The space shall prevent the continuous immersion of the roof slab in the tank water .thus we are preventing water from getting polluted.

Maintain a Free board of 250 mm to 300 mm normally .

Therefore , while calculating the height of the water tank , add this 250 mm to 300 mm in the height of the water.

2. Buffer capacity:

While calculating the water tank size, always add at least 100 mm to 150 mm in the height of the water tank { Apart from the 250 mm to 300 mm for the free board }.

The purpose is like this .

In every water tank , there shall always be a tendency for the silt to get deposited in the bottom.

If you keep the delivery pipe exactly at the base, then the silt shall keep flowing through the pipe and shall enter the household through he taps. To prevent this , it is better to fix the delivery pipe at least 100 mm to 150 mm above the base slab of the water tank.

How to find the size of the Water Tank

Dear Readers ,

One of the blog followers has asked a question today .

” How do we determine the size of the water tank ? “

Just for updating , we have already seen how to calculate the capacity of the water tank

if the overall size is known to us.

Water tank capacity

So in this article, you shall understand the basic process of finding out the size of the water tank.

Step 01 :

Compile the basic data which include the following factors.

1. No of units or flats to be served by this water tank.( U )

2.Average members per unit ( m )

3.Average water consumption per person per day ( w )

4. Water Storage to be made for how many days ( n )
5. Buffer supply to be maintained in the tank ( x% )

6.free board to be kept ( 250 to300 mm )

7.What could be the area of the water tank ?

( depends on the size of the stair case /Lift room above which the water tank is to be constructed )

Step 02 :

Find out the the capacity of the water tank :

C = n x w x m x U litres

Step 03 ;

Add for the buffer storage in the tank @ 5 %

C1 = 1.05 (  n x w x m x U ) litres

C2 = 1.05 (  n x w x m x U ) litres/1000 =  CuM

Step 04 :

Find out the height of the water in the tank:

h= water capacity in CuM / area of the water tank ( a x b) ,

Step 05 :

Find out total height of the water tank :

H = h + free board

Step 06 :

So now you have the basic internal size of the water tank.

Step 07 :

Find out the out size of the water tank with certain assumptions for RCC wall , RCC base slab

RCC top slab :

Hope this sequence is quite clear to you.

PS :

For those of you , who are not quite clear on these calculations , just wait for the next post where we shall actually take one case study and find out the sizes.

Till then ,

Bye