Category Archives: cost

ITEM RATE FOR AAC BLOCK MASONRY

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READERS :

In case you are puzzled over this factor 2.43 , please this article ;

Rate analysis for brick work 

Thank you

 

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PLASTERING COST ? TWO MINUTES…

Dear Friends ,

Let us give a big hand to Mr.Somappa who has joined as the 497th Follower of this blog.          He is an old student and has got a rich experience of tunnels and storm water drains .

We need ONLY THREE more followers so as to complete FIVE CENTURIES OF followers.

Today we shall do some work in the Internal Plaster.

We shall find out total cost of the plastering and this we shall do step by step right from scratch.

Keep on reading further !

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Gross cost of a water tank

Dear Friends ,

In the previous article, we planned a water tank .

We arrived at the dimensions of the water tank.

[ Read the post here ]

Now let us calculate the total cost for this construction as follows :

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Oh ,so much material I have to buy ?

Dear Readers ,

We are meeting after a long gap .

I was occupied in some different priorities during this time.

When one of the students ( who is also a  follower to this blog ) asked me about no new post for a long time , I thought I shall immediately post something interesting today.

In our previous articles, we have already covered the basic theory behind using the AAC blocks. [ Read the article here ]

As you know , these blocks , Autoclaved Aerated concrete blocks are quite light in weight.

When you compare the unit weight of AAC blocks @ 600 Kg/cum with that of the red bricks @1900 Kg/Cum, we find that these blocks reduce the dead weight of the building.

These are also faster to build . Whereas we need 510 bricks for 1 cum of brick work, we need only 42 Blocks for 1 CuM of AAC block masonry. Thus, the mason needs to handle only 42 AAC blocks as against 510 bricks.

The mortar quantity is also reduced from 25% in brick work to 4.5 % in AAC block masonry.

Now let us solve one practical example from the site.

Question :

Find out the total material needed to construct a wall using AAC blocks with the following details :

  1. Size of AAC block : 625 mm x 240 mm x 150 mm
  2. Cement mortar mix ; CM ( 1:4 )
  3. Thickness of the joint : 5 mm

4.Wall dimensions : 5.5 m x 2.9 m x 0.15 m

 

Solution :

Step 01 : Volume of the masonry wall : 5.5 m x 2.9 m x 0.15 m =  2.3925 Cum.

Step 02 : Materials needed for the Cement mortar CM 1:4 :

Cement : 1.52*28.8 /( 1+4 ) = 8.76 Bags

Sand : 1.52*4 /( 1+4 )   = 1.216 Cu M.* 0.3529 = 0.429 Brass

Step 03 :  Volume of 1 block of size  625 mm x 240 mm x 150 mm :

0.625 m x 0.240 m x 0.150 m = 0.0225 cum.

Step 04 : No of blocks in 1 Cum = 1/0.0225 = 44.44 Nos.

Step 05 :  Increased dimensions of  1 block due to 5 mm mortar  joint :

 ( 625 +5 ) mm x ( 240 +5 )mm x ( 150+5 ) mm :

= 630 mm x 245mm x 155 mm

Step 06 : Volume of block with mortar :

0.63  m x 0.245  m x 0.155 m = 0.0239 cum.

Step 07 : No of blocks in 1 Cum = 1/0.0239 = 41.84 Nos.= 42 blocks.

Step 08 : Difference in no of blocks due to mortar : 44 -42 = 2 blocks.

Step 09 : Volume of mortar in 1 Cum = volume of 2 blocks = 2 * 0.0225 = 0.045 Cum.

Note : this means 0.045 x 100 = 4.5 % mortar.

Step 10 : Calculate the materials needed for 1 Cum of block masonry :

Blocks : 42 Nos

Cement :  8.76 Bags * 0.045 Cum. = 0.39 bags.

Sand : = 0.429 Brass* 0.045 Cum. = 0.019 Brass

Step 11 :  Total material needed for 2.3925 Cum. of masonry :

Blocks :    42 Nos * 2.3925 Cum  = 100.485 Blocks = 105 Blocks

Cement :  0.39 bags. x   2.3925 Cum = 0.93 Bags = 1 bag

Sand :       0.019 Brass x 2.3925 Cum =0.045 Brass =0.046 Brass

With this much information , it is also easy to find out the cost of the materials .

Step 12 :

Blocks :    105 Blocks@ 72 per block = Rs.7560

Note :The cost of AAC block is considered @ Rs.3300 per Cum.

Cement :  1 bag@ 300 Rs/bag  =             Rs.300

Sand : 0.046 Brass@4200 Rs/Brass       Rs. 193

Total cost : Rs.7560 + Rs.300 + Rs. 193 = Rs.8053

Cost per Cum = 8053/2.3925 = Rs.3366

Cost per CFt : Rs.3366/35.29 = Rs.95

 

Hope you are able to follow these steps.

In case of any doubt , please let me know.

All the best !

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Webinars registration open ….

Dear Reader ,

You shall be glad to know that the much awaited webinars are being organized very shortly.

Just go to the our web site and fill in the registration form.

Here is a link to the web site .

The first webinar shall be organized on :

” How to find out the cost of a RCC box footing ? “

This shall be dealt in very basics .

Background :

It is a common observation that when it comes to calculations , estimation and costing , many people find it rather difficult.

Thats why this topic has been selected so that adequate practice gets done through the webinars.

You excel !

Dear Reader ,

Good afternoon !

Have been doing some work on excel recently and have already made one simple application  for construction persons .
This shall be useful for the office as well for site people.
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Brief description about this application :
 Its in excel and can be applied to any Beam size .
  1. You can feed the following :
    1. Beam dimensions ( length , width ,depth )
    2. Reinforcement details :
      1. Top bars ( Dia and Nos )
      2. Bottom bars ( Dia and Nos )
      3. Stirrups ( Dia and spacing  )
      4. bent up bars ( Dia and Nos )
    3. Rates :
      1. Tor steel  (  per kg )
      2. Binding wire  (  per kg )
      3. Labour rates for reinforcement (  per kg )
  2. It calculates :
      1.  the cutting lengths for :
        1. Top bars
        2. Bottom bars
        3. Stirrups
        4. Bent up bars
      2. No of stirrups needed
      3. Total weight of reinf per beam
      4. Total volume of one beam
      5. Reinf weight per CuM of concrete
      6. Reinf. cost per CuM of concrete
I suggest you also start working on excel right now and create similar application .
This shall be quite useful to you on day to day work at site.
In case you want a starting point , I can also provide you with what I have created.
For that , just subscribe through the form provided in the post :
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WORK ON EXCEL BY MY HI-TECH AND ENTHUSIASTIC STUDENT : GANESH

In case you want to read more on Excel , do read these articles :

Wish you Excel in your work

How can I learn Excel ?