All about civil construction knowledge- PARAM VISIONS

Field test for the solid concrete blocks

Field test for the solid concrete blocks

Solid concrete block  Fig. 1.


You can check the quality of the solid concrete blocks on site by following some simple methods as given below.

1. Drop test

 Randomly select one block from the total no. of blocks of the particular batch. Lift the block at about 4 to 4.5 feet which is nearer to your chest level and drop it on the hard ground surface.

 Vertical drop: The length of the block should be kept in a vertical position before dropping it on the ground. The concrete block should be intact in shape without any damage after crushing over the ground surface. If the sample block breaks into pieces or develops a crack then it is better to reject such concrete blocks.

Horizontal drop: You have to hold the concrete block with the length of the block in the horizontal position as shown in fig. 2. From the same chest height, you again drop the block on the hard surface. If the block breaks into no. of pieces, then such blocks can be considered as low-quality blocks.

The horizontal dropping of concrete block. Fig. 2.




2. Corner test


Press the corner of the block with your thumbnail on all the eight sides one by one as shown in fig. 3. If it gives out or if some particles are broken from the edge, then you can classify such blocks as of low quality.

Pressing the corner of the concrete block. Fig. 3.

3. Chisel test


This is a comparative test for the two or more sample blocks collected from the different production units to recognize the manufacturer, who delivers the best quality of blocks.

Cut the groove into the solid concrete blocks, horizontally running on all the four sides of equal depth by using chisels as shown in fig. 4. It should be cut at the center of the block until the block separates into two pieces. In this test, you will find the quality of the blocks by the three actions.

Hardness: If it is harder to chisel the block and if it takes more time for cutting out in comparison to all other sample blocks, then it gives you a hint that the blocks of that particular batch are of good quality.

Groove depth:  Measure the depth of the cutting at the time of separation of the block. If the depth of the groove is more in comparison, then that block can be considered as of good quality.

Breakage: If the block breaks into several pieces at this process, then it is better to drop that batch of the block from your list.

Chisel test for the block. Fig. 4.

4. Nail test 


This is also a comparative test similar to the chisel test. You have to hammer a nail into the sample blocks on three or more points. This action will provide you with the following data for the block selection.

 Resistance: If the block resists the insertion of the nail and if it is harder to hammer a nail then you can position that block above all other different samples which exhibit low resistance.

Grip: If the block provides a good grip to the nail by restricting its movement, it is also an indicator of the block quality.

5. Texture


The blocks should have a grainy surface texture which you can observe in the fig. 1. If the concrete block has a smooth texture finish then it indicates the more quarry dust content in its mix proportion.
The dust weakens the concrete strength which in turn results in a block production of low compressive strength.

6. Shape & size


The block should have a uniform shape with sharp edges. The difference in the dimensions on the two similar sides at both the end should not be more than ±3 mm. (allowance).








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Solid concrete blocks size, weight, and price.

  • Solid concrete block sizes.

The actual (or basic) size of the block is 0.375 inch ( 3/8") or 10 mm lesser than the nominal (or modular) size of the block.

Given below are the different nominal sizes of the solid concrete blocks in the Indian market.

Sl.No.
Nominal size
in inches
W × H × L
Nominal size
in mm.
  W × H × L
1.
4” × 8” × 16”
100 × 200 × 400
2.
6” × 8” × 16”
150 ×  200 × 400
3.
8” × 8” × 16”
200 ×  200 × 400
4.
4” × 8” × 12”
100 × 200 × 300
5.
6” × 8” × 12”
150 × 200 × 300
6.
8” × 8” × 12”
200 × 200 × 300
7.
4” × 3” × 9”
100 × 75  × 230
8.
4” × 6” × 9”
100 × 150 × 230
9.
4” × 6” × 12”
100 × 150 × 300
For your reference, the actual and the nominal size of the block for the Sl. No. 1. is given below.


Sl.No.
Nominal size
in inches
Actual size
in inches
Nominal size
in mm.
Actual size
in mm.
1.
4”× 8” × 16”
35/8”× 75/8”× 155/8”
100 × 200 × 400
90×190×390

Similarly, you can calculate the actual sizes of the other blocks.

  • Weight in Kgs. & pounds of the solid concrete blocks.


The density of the solid concrete blocks varies from 2100 kg/cu.m  to 2400 kg/cu.m depending upon the raw material & machinery used in its manufacturing process. For the calculation of the weight of the solid concrete block, I have considered the density of  2350 kg/cu.m. (preferred) 

Given below are the weight of the concrete blocks of various sizes.

Sl.No.
Actual size
in mm.
Weight in kgs.
Weight in
US pounds
1.
 90 ×190 ×390
15.65 kg.
34.50 lb.
2.
140 ×190 ×390
24.35 kg.
53.65 lb.
3.
190 ×190 ×390
33.00 kg.
72.75 lb.
4.
 90 ×190 ×290
11.65 kg.
25.70 lb.
5.
140 ×190 ×290
18.10 kg.
39,90 lb.
6.
190 ×190 ×290
24.60 kg.
54.20 lb.
7.
 90 ×  65 ×220
 3.02 kg
 6.65 lb.
8.
 90 ×140 ×220
 6.50 kg.
14.30 lb.
9.
 90 ×140 ×290
 8.60 kg.
18.95 lb.


  • Solid concrete block price.


The cost of the concrete block depends upon the raw material proportion, regional raw material cost, regional labor cost, size, quality, and type of manufacturing process.

Given below are the average price list of the solid concrete blocks in the Indian market.


Sl.No.
Nominal size
in inches
W × H × L
Nominal size
in mm.
  W × H × L
Average price
in Rupees/ No.

1.
4” × 8” × 16”
100 × 200 × 400
Rs 25/- No.
2.
6” × 8” × 16”
150 ×  200 × 400
Rs 34/- No.
3.
8” × 8” × 16”
200 ×  200 × 400
Rs 42/- No.
4.
4” × 8” × 12”
100 × 200 × 300
Rs 20/- No
5.
6” × 8” × 12”
150 × 200 × 300
Rs 26/- No
6.
8” × 8” × 12”
200 × 200 × 300
Rs 32/- No
7.
4” × 3” × 9”
100 × 75  × 230
Rs   5/- No
8.
4” × 6” × 9”
100 × 150 × 230
Rs   9/- No
9.
4” × 6” × 12”
100 × 150 × 300
Rs 13/- No

Note: Transport and taxes should be added for the delivery.


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Barbed fencing wire length per kg, buying tips, its cost & package details.


What is the length per kg. of barbed fencing wire?


The length/kg. of the barbed wire largely depends upon the wire gauge and its type. The other factors which affect the length are barb wire spacing, no.of  barb in a single point, and the barb length.

Given below are the length per kg. and also wt. per running meter of some commonly used barbed wires at the different barb wire spacing.




Sl. No.
SWG of
Barbed wire
Spacing of barb
in inches
Wire length in
m/kg.
Wire wt./Rm
in kg.
1.
12×12
3 inch

4 inch

5 inch

6 inch
6.06 mt./kg.

6.76

7.27

7.64
0.165 kg

0.148

0.138

0.131
2.
12×14
3 inch

4 inch

5 inch

6 inch
7.33 mt./kg

7.91

8.30

8.57
0.136 kg

0.126

0.120

0.117
3.
13×13
3 inch

4 inch

5 inch

6 inch
7.98 mt./kg.

8.90

9.57

10.05
0.125 kg

0.112

0.104

0.099
4.
13×14
3 inch

4 inch

5 inch
6 inch
8.85 mt./kg.

9.69

10.29

10.71
0.113 kg

0.103

0.097

0.093
5.
14×14
3 inch

4 inch

5 inch

6 inch
10.46 mt./kg.

11.66

12.54

13.18
0.096 kg

0.086

0.079

0.076
6.
15×15
3 inch

4 inch

5 inch

6 inch
13.89 mt./kg
.
15.49

16.67

17.51
0.072 kg.

0.065

0.060

0.057

Where SWG stands for standard wire gauge.


What is the cost per kg. of barbed wire?


The price of the barbed wire depends upon the type of wire, the thickness of the zinc coating, the spacing of the barb, the material used, etc. The approximate price of the barbed wire in the Indian market, depending upon its type is given below.


Sl.No.
Type of barbed wire
Average price/kg.
in Indian Rupees
Average price/kg.
in American Dollars
1.
Galvanized

Rs 60/ kg.
USD 0.85/ kg..
2.
P.V.C. coated

Rs 80 / kg.
USD 1.15/ kg.
3.
Stainless steel

Rs 150 / kg.
USD 2.15/ kg.




Barbed fencing wire buying tips.


The following are the points to be considered while purchasing the barbed wires.

1. Type of the barbed wire depending upon the

a)  No. of twists.
b) Type of surface coating.

2. Materials used in the manufacturing process.

3. The gauge of the line wire and barb wire.

4. The spacing of the barb wire.

5. Number of barb wire at a single point and its length.

6. Total length in a bundle and weight per running mt.

7. Diameter and packaging type of wire bundle.


Barbed wire package details

The different styles of barbed wire packing with the average details of its bundle size, wire length, and weight are provided below.

 1. Barbed wire packing types

a) Simple packing with woven bags and waterproof papers.
b) Carton packing.
c) Wood roller packing.
d) Wire roller packing.
e) With wood/steel/plastic handle.

2. The weight of the barbed wire bundle: 20- 35 kg.

3. The diameter of the bundle: 25- 35 cm.

4. Length of the wire in a bundle: 180 - 400 m.


⏪ continued from page 1.







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