Grading sand and purpose of used for construction

 

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Number of blocks in one metre square area (for 300 mm x 150 mm block)

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Usually, we represent the number of blocks in terms of area (m2) rather than length.                                    Consider a block of dimension 300 mm x 150 mm x 100 mm . ( wall thickness is 100 mm )   but for the accurate value we should consider a 10 mm thick mortar layer around the blocks for binding them to each other. Therefore, we consider a single block's length (including mortar) is 310 mm and its height is 160 mm. The area of one block including mortar is 0.31 m × 0.16 m = 0.0496 m2. The number of blocks in one metre square (m2) can be calculated as 1/0.0496 = 20.16 blocks Any area's block count can be determined by multiplying it by 20.16  
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The internal dimension of  the gauge box for measuring aggregate is 400 mm x 350 mm x 250 mm (which is 0.035 m³ and corresponds to the volume of a 50 kg bag of cement and dry volume sand is used for proportioning) The internal dimension of the gauge box for measuring cement is 400 mm x 350 mm x 290 mm (This volume is equal to a 50 kg bag of cement)         GAUGE BOX
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