Field test for the solid concrete blocks

Field test for the solid concrete blocks

Solid concrete blocks 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 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 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 blocks.

Cut the groove into the solid concrete blocks, horizontally running on all 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 of good quality.

Breakage: 

If the block breaks into several pieces during 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 on the nail by restricting its movement, it is also an indicator of the block's quality.

5. Texture

The blocks should have a grainy surface texture which you can observe in fig. 1. If the concrete block has a smooth texture finish then it indicates 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 ends should not be more than ±3 mm. (allowance).

To go through the field & laboratory tests conducted in civil engineering,  click here.

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Solid concrete blocks size, weight, and price./ What are dimensions & weight of cement blocks?

• Solid concrete block sizes.
• 
  

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

Given below are the different nominal sizes of 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 kg. & pounds of 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 the 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 material proportion, regional raw material cost, regional labor cost, size, quality, and manufacturing process.

Given below is 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 INR/ 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.

To go through the articles on Estimation & calculation in civil engineering, click here.

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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 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.

Go through the article👇

💁 °   Different types of fencing wires.

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 barbed wire in the Indian market, depending on 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 barbed wires.

1. Type of the barbed wire depends 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 their 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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