What are cement and sand for 100 m2 of 12 mm plaster in 1:6?

Cement 1/7 x 1.524 = 0.2177 m3 (6.27 bags); sand 6/7 x 1.524 = 1.306 m3

Cement 1/6 x 1.524 m3; sand 5/6

Cement 1/7 x 1.2 m3; sand 6/7 x 1.2 m3

Cement 1/6 x 1.2 m3; sand 6/6 x 1.2 m3

For 100 m3 of PCC 1:2:4, how much cement is required?

1/7 x 154 = 22.0 m3 = 633.6 bags

What are sand and aggregate for 100 m3 of PCC 1:2:4?

Sand 44.0 m3 and aggregate 88.0 m3

Sand 88.0 m3 and aggregate 44.0 m3

Sand 28.6 m3 and aggregate 57.1 m3

Sand 22.0 m3 and aggregate 44.0 m3

2066 Bhadra (old course) · 10 marks

Materials: 100 m² plaster 1:6, 100 m³ PCC 1:2:4

Short answer

For 100 m2 12 mm plaster (1:6), wet mortar 1.2 m3, dry 1.524 m3: cement 6.27 bags, sand 1.31 m3. For 100 m3 PCC (1:2:4), dry volume 154 m3: cement 633.6 bags, sand 44 m3, aggregate 88 m3.

Calculate the quantities of material required for following works. i) 100 m² cement sand plaster 12 mm thick in (1:6) ii) 100 m³ P.C.C. (1:2:4).

Assumptions: dry volume 1.27 × wet for mortar and 1.54 × wet for concrete; 1 m³ cement = 28.8 bags; no wastage.

(i) 100 m² of 12 mm plaster (1:6)

Wet mortar $= 100.0 \times 0.0120 = 1.2000$ m³; dry volume $= 1.27 \times 1.2000 = 1.5240$ m³
Cement $= 1/7 \times 1.5240 = 0.2177$ m³ $= 6.27$ bags
Sand $= 6/7 \times 1.5240 = 1.3063$ m³

(ii) 100 m³ of PCC (1:2:4)

Wet volume $= 100.000$ m³; dry volume $= 1.54 \times 100.000 = 154.000$ m³ (sum of ratio $= 7$ )
Cement $= 1/7 \times 154.000 = 22.000$ m³ $= 22.000 \times 28.8 = 633.6$ bags (50 kg)
Sand $= 2/7 \times 154.000 = 44.000$ m³
Coarse aggregate $= 4/7 \times 154.000 = 88.000$ m³

Answer: (i) cement 6.3 bags, sand 1.31 m³. (ii) cement 633.6 bags, sand 44.00 m³, aggregate 88.00 m³.

✓ Answer checked by Claude Opus 5.5 (high effort)

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Materials: 100 m² plaster 1:6, 100 m³ PCC 1:2:4

(i) 100 m² of 12 mm plaster (1:6)

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