# PARAM VISIONS

All about civil construction knowledge- PARAM VISIONS

• ### PARAM VISIONS

The vision of present and future

• ### BUILDING MATERIALS

Different types of building materials at a glance

• ### DESIGN AND DRAWING

For clear ideas in calculating building materials and structural design

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• ### INFRASTRUCTURE AND USEFUL TIPS

We share useful tips in building construction and infrastructure knowledge with embedded youtube videos

### How to calculate the number of interlocking paver blocks required for any given area?

Let us consider the parking area as shown in the below drawing for the calculation purpose.

Given data:

Length of the parking space =20 ft.

The breadth of the parking space = 18 ft.

Total parking area

= 20 ft. × 18 ft.

= 360 sq ft.

The interlocking paver blocks are available in huge no. of patterns, shapes, & models. The dimension of individual design differs from the other.

When the manufacturer delivers or distributes their paver models of a given dimension, they provide the specification for the customers as shown below.

As mentioned by the manufacturer,

The coverage area of  I- shape interlocking paver block = 2.9 nos. per sq ft.

So, the total no. of paver blocks required

=[ total parking area × no. of paver blocks per sq ft.]

= [360 sq ft. × 2.9 nos./ sq ft.]

= 1044 nos.

Adding 5% extra for the wastage & future use

= [1044 nos. + (1044 × 5 ÷ 100)]

= [1044 + 52.20]

= 1096.20 nos. say 1097 nos.

Let us do the same calculation procedure in the table format for our convenience as shown below.

 Sl. No. Description. Parking area in sq ft. Pavers required/sq ft. in nos. Total No. of paver blocks 1. I-shaped paver block 360 2.90 1044 nos. 2. Add 5% wastage = 52.20 nos. 3. Total no. of I-shaped paver blocks required= 1096.20 nos.

Here, the area covered by the paver block is given per sqm.

i.e. area coverage = 35 pieces/sq m.

So the no. of paver blocks/sq ft. = 35 ÷ 10.764

= 3.25 nos.

Total no. of paver blocks required

= [360 sq ft. × 3.25 nos./ sq ft.]

= 1170 nos.

Adding 5% extra for the wastage & future use

= [1170 nos. + (1170 × 5 ÷ 100)]

= [1170 + 58.5]

= 1228.5 nos. say 1229 nos.

If you have any quarries, you can ask me in the comment boxðŸ‘‡.

### Adhesive or cement mortar: Which is better for AAC block masonry?

If you want to choose between the adhesive & cement mortar for AAC block wall masonry, definitely, adhesive joint ranks on top due to its added advantages.

Let's observe the pros & cons between these two types of joints for AAC block wall masonry.

1. Cost:

I have calculated the construction cost of AAC block masonry using Adhesive & cement mortars separately in the below-given article.ðŸ‘‡

Although the above article's theoretical calculation shows neck to neck difference in their construction costs, adhesive bond works out to be cheaper. You will understand this when you go through the following 9 points.

2. Wastage:

When we work practically on the construction site, the wastage will be nearer to 10% in the case of cement mortars.

The adhesive layer thickness is kept within 3 to 4mm. That creates a wastage below 5%, i.e. nearly half that of the cement mortar.

3. Quality control:

In the case of cement mortar, the mixing of cement, sand, & water is done by the laborers. Keeping an eye on every batch of mix is difficult, & that may create improper mix proportion.

So, adhesives help to maintain the required quality in a better way.

4. Time:

When we compare cement mortar Vs. adhesive, the time required in adhesive joint wall construction is less.

Cement mortar needs mixing of raw materials on-site with lead & lift. But in the case of adhesives, add water & you are ready to start work.

5. Material consumption:

The thickness of cement mortar layer  ðŸ‘‰ 10 to 12mm.

The thickness of an adhesive layer       ðŸ‘‰ 3 to 4mm.

So, the material consumption in the cement mortar layer is 2.5 to 3 times more in comparison to adhesives. That means more labor, more time & higher cost.

6. Cleanliness:

The AAC block wall construction looks neat & clean when we use adhesive bonds. In situ mixes of cement mortar nearer to the working area creates an unclean floor space.

When we work with the cement mortars, the fall off of the fresh mortars from the joints is more. The same is minimal in the adhesive layers.

7. Curing:

AAC block adhesives are formulated by using self-curing compounds in their composition. They don't require any curing after the completion of wall masonry.

But the cement mortar needs proper curing till its specified time period.

8. Project speed :

When we complete the masonry construction with cement mortar, the successive work cannot be started immediately. We have to wait for the curing period to gain the required strength.

When we use adhesives, the plastering work can be done on the next day.

Using adhesive comparatively consumes less time in wall building & completing the work.

So, the project work can be completed in the stipulated time by reducing the time gap.

9. Bond strength:

Adhesives are formulated in such a way that the AAC block properties match well with them. This creates a good bond strength between the two materials, enhancing the life span of the building.

The cement mortars (comparatively ) are not a well proportioned binder material  for the AAC blocks. The composition of AAC blocks makes them brittle in nature.Due to this,the cement mortar fails to hold them together in all types of climatic conditions.

10. Thermal expansion:

The AAC blocks expand & contract due to the external weather conditions.

You may observe cracks in the cement mortar joints due to these thermal expansion of the walls. And again, the reason is, unmatched properties of these two separate materials.

When we use adhesives, rarely you may observe cracks in the walls.

Now, after writing these 10 points, my question to you is,

Which is better for AAC block masonry?

### Comparing the construction cost of concrete block, clay brick, & AAC block walls.

Let us now compare the construction cost of concrete block, burnt clay brick, & AAC block walls.

I have calculated the cost of all these types of bricks & blocks as linked below.

So, before proceeding further, you have to go through these 4 articles ðŸ‘‡

As the thickness of all these types of walls varies in their dimensions, we will compare their cost volumetrically.

I have extracted the data from the above articles and made the comparison in a table format as shown below.

 Sl. no. Item. Cost per CUM in INR Cost per Cu ft. in INR Unit. 1. Concrete block 3513.84 99.50 INR 2. 9" brick wall 5633.45 159.52 INR 3. AAC block 5952.37 168.55 INR 4. 4"  brick wall 6150.81 174.17 INR

From the above table, you can observe that the concrete block walls are cheaper when compared to other types of wall construction.

Now, let us observe the comparative cost ratio of all types of walls, keeping the cost of concrete block construction as X (base rate ).

 Sl. no. Item. Cost per CUM in INR Cost per Cu ft. in INR Unit. Cost ratio in X 1. Concrete block 3513.84 99.50 INR X 2. 9" brick wall 5633.45 159.52 INR 1.60X 3. AAC block 5952.37 168.55 INR 1.70X 4. 4"  brick wall 6150.81 174.17 INR 1.75X

When we construct the wall masonry, the cost per sq ft. plays an important role to decide the total cost of the building.

So, for your reference, the comparative cost /sq ft. & their cost ratio are shown in the table format.

 Sl. no. Item. Wall thickness In inches Cost per Sq  ft. in INR Cost  ratio In X 1. Concrete block 6" 49.75 X 2. Brick wall 4" 58.05 1.17X 3. AAC block 8" 112.37 2.26 X 4. Brick wall 4" 119.64 2.40 X

If you have any quarries, you can ask me in the comment boxðŸ‘‡.

### What will be the cost of AAC block wall masonry?/ Rate analysis of 200mm. thick AAC block wall work.

In this article, let us calculate the cost of AAC block wall, constructed by using adhesives as well as cement mortar.

Before proceeding further, you have to go through the articles ðŸ‘‡

2.  The material calculation for AAC block wall construction with cement mortar.

A.  Material cost:

1.  AAC blocks.

The market rate for the AAC blocks ranges from INR 2800/CUM to 3400/CUM.

Let us take an average rate of INR 3100/CUM for the calculation purpose.

Volume of AAC block = 0.024 CUM.

So, the cost of a single  AAC block

= [(INR 3100 × 0.024 CUM) ÷ 1CUM ]

= 74.4 say INR 75/-

The market rate for the 40kg. adhesive bag ranges from INR 500/- to 700/- per bag.

Let us take an average rate of INR 600/- for the calculation purpose.

B.  Labor cost:

The labor cost per CUM of  AAC block wall construction ranges from INR 1800/- to 2500/-

Let us consider an average rate of INR 2150/- for the calculation purpose.

Now, let us calculate the cost of the AAC block wall per CUM in the table format.

1.  Cost of an AAC block wall constructed with adhesives:

 Sl. no. Item. Qty. Rate. in INR. Unit. Cost in INR. 1. AAC  block 40.58 75/- No. 3043.50 2. Adhesive bag of 40kg. wt. 0.713 600/- bag 427.80 3. Miscellaneous Lump-sum 150.00 4. The material cost = 3,621.30 5. Add 5% wastage = 181.07 6. Total material cost = 3802.37 7. Labour cost = 2150.00 8. The total cost of AAC block masonry = 5952.37

2.  Cost of an  AAC block wall constructed with cement mortar.

 Sl. no. Item. Qty. Rate. in INR. Unit. Cost in INR. 1. AAC block 39 75/- Nos. 2,925.00 2. Cement 0.3505 380/- bag 133.19 3. Sand 0.072 2100/- CUM 151.20 4. Curing Lump-sum 200.00 5. Miscellaneous Lump-sum 150.00 6. The material cost = 3,559.39 7. Add 5% wastage = 177.97 8. Total material cost = 3,737.36 9. Labour cost = 2,150.00 10. The total cost of AAC block masonry = 5,887.36

Note:

1. The quantity of materials in the table is taken from the above-said articles.

2. To get accurate results, insert the ongoing market rate of labor & materials in your country.

From the above tables, you can observe that the construction cost of the AAC block will be nearly the same in both cases.

My suggestion is, always use adhesives, instead of cement mortar for better construction quality.

To understand them in a better way, go through the article ðŸ‘‡

### How to calculate the quantity of adhesives & AAC blocks required in AAC block wall works?

Let us consider an AAC block wall of size 3m. × 10m. × 0.2m.  as shown in the drawing.

Now, we will build this wall with an AAC block of size 200 mm × 200 mm × 600 mm as shown in the image below.

Generally, the AAC block wall is constructed with 3mm. to 4mm. thick adhesive joints. Let us consider 4mm. thickness for the calculation purpose.

Given data:

Length of the block wall = 10m.

Height of the block wall = 3m.

The thickness of the block wall = 0.2m.

AAC block size = 0.2m × 0.2m × 0.6m.

Adhesive joint thickness = 4mm = 0.004m.

To calculate the number of blocks required to build this wall, first, we will find out the volume of the wall and the volume of a single AAC block with or without adhesive.

The volume of the block wall

= Length × Height × Thickness

= 3m. × 10m. × 0.2m.

= 6 CUM.

Now, the volume of the AAC block

= length × height × thickness

= 600 mm × 200 mm × 200 mm

( By converting them into m.)

= 0.6m × 0.2m × 0.2m.

=0.024 CUM.

From the drawing given below, you can observe that the addition of the adhesive thickness comes on the 2 sides of every block. I have denoted them with the nos. 1, & 2.

So, the volume of the AAC block with adhesive

=  0.604m × 0.204m × 0.2m.

=0.02464 CUM.

1.  The number of AAC blocks required

= volume of the wall ÷ volume of the block with adhesive

= 6 CUM. ÷ 0.02464 CUM.

=243.50 nos.

= volume of the block wall - the volume of the total no. of AAC blocks

= [volume of the block wall - ( no. of blocks  × vol. of a single block.)]

= [6 CUM. - (243.5 nos. × 0.024 CUM.)]

=   [6 CUM. - 5.844 CUM.]

=0.156 CUM.

The 40 kg of adhesive bag covers 6 to 8 sqm. wall area in 4mm. joint thickness. This coverage area is considered for the 200mm. thick  AAC block wall.

Let us consider the average cover area of 7 sqm. for 1 adhesive bag.

The area of the block wall

= length × height

= 10m. × 3m.

= 30 sqm.

The no. of adhesive bags (40kg.) required

= [total area of block wall ÷ area covered by 1 bag]

= [30 sqm. ÷ 7 sqm.]

= 4.28 bags.

Let us now find out the materials required for 1 CUM. & 1 cu ft. of an AAC block wall.

1.  AAC blocks:

Blocks required for 1 CUM. of AAC block wall

For 6 CUM of block wall       ðŸ‘‰ 243.5 nos. of AAC block.

So, for 1 CUM of block wall  ðŸ‘‰ _ nos. of AAC block?.

=[ 1 CUM × 243.5 nos. ÷ 6 CUM.]

40.58 nos.

Blocks required for 1 cu ft. of wall

= 40.58 nos. ÷ 35.315

( As 1CUM = 35.315 cu ft.)

1.149 nos.

Adhesive required for 1 CUM. of AAC block wall

=[ 1 CUM × 4.28 bags. ÷ 6 CUM.]

0.713 bags

Adhesive required for 1 cu ft. of block wall

= [0.713 bags ÷ 35.315]

0.021 bags.

### Material calculation for AAC block wall construction with cement mortar.

Let us consider an AAC block wall of size 3m. × 10m. × 0.2m.  as shown in the drawing.

Now, we will build this wall with an AAC block of size 200 mm × 200 mm × 600 mm as shown in the image below.

Generally, the AAC block wall is constructed with 8mm. to12mm. mortar thickness. Let us take an average thickness of 10mm. for the calculation purpose.

Given data:

Length of the block wall = 10m.

Height of the block wall = 3m.

The thickness of the block wall = 0.2m.

AAC block size = 0.2m × 0.2m × 0.6m.

Mortar thickness = 10mm = 0.01m.

To calculate the number of blocks required to build this wall, first, we will find out the volume of the wall and the volume of a single AAC block with or without mortar.

The volume of the block wall

= Length × Height × Thickness

= 3m. × 10m. × 0.2m.

= 6 CUM.

Now, the volume of the AAC block

= length × height × thickness

= 600 mm × 200 mm × 200 mm

( By converting them into m.)

= 0.6m × 0.2m × 0.2m.

=0.024 CUM.

From the drawing given below, you can observe that the addition of the mortar thickness comes on the 2 sides of every block. I have denoted them with the nos. 1, & 2.

So, the volume of the AAC block with mortar

=  0.61m × 0.21m × 0.2m.

=0.02562 CUM.

1.  The number of AAC blocks required

= volume of the wall ÷ volume of the block with mortar

= 6 CUM. ÷ 0.02562 CUM.

=234.2 nos.

The volume of mortar required

= volume of the block wall - the volume of the total no. of AAC blocks

= [volume of the block wall - ( no. of blocks  × vol. of a single block.)]

= [6 CUM. - (234.2 nos. × 0.024 CUM.)]

=   [6 CUM. - 5.62 CUM.]

=0.38 CUM.

Let us prepare this 0.38 CUM. of mortar in a 1: 6 ratio to build this 6 CUM. of the AAC block wall.

Dry volume of the cement mortar

= 1.33 × 0.38 CUM.

= 0.505 CUM.

2.  Volume of the sand

= (6  ÷ ( 6 + 1)) × 0.505 CUM.

= 0.8571 × 0.505 CUM.

= 0.432 CUM.

3. Volume of the cement

= total dry mortar vol. - volume of sand

= 0.505 CUM. - 0.432 CUM.

=0.073 CUM.

= 2.578 cu ft.

As you know, one bag of cement = 1.226 cu ft.

Number of cement bags

= [2.578 cu ft. . ÷ 1.226 cu ft.]

=   2.103 bags.

Let us now find out the materials required for 1 CUM. & 1 cu ft. of an AAC block wall.

1. AAC blocks:

Blocks required for 1 CUM. of AAC block wall

For 6 CUM of block wall       ðŸ‘‰ 234.2 nos. of AAC block.

So, for 1 CUM of block wall  ðŸ‘‰ _ nos. of AAC block?.

=[ 1 CUM × 234.2 nos. ÷ 6 CUM.]

= 39 nos.

Blocks required for 1 cu ft. of wall

= 39 nos. ÷ 35.315

( As 1CUM = 35.315 cu ft.)

1.105 nos.

2. Cement:

Cement required for 1 CUM. of AAC block wall

=[ 1 CUM × 2.103 bags. ÷ 6 CUM.]

0.3505 bags

Cement required for 1 cu ft. of block wall

= [0.3505 bags ÷ 35.315]

0.01 bags.

3. Sand:

Sand required for 1 CUM. of AAC block wall

= =[ 1 CUM × 0.432 CUM ÷ 6 CUM.]

0.072 CUM.

Sand required for 1 cu ft. of block wall

= [0.072 CUM. ÷ 35.315]

0.002 cu ft.