For 10 m3 of M20 concrete, what dry volume of materials is required?

15.40 m3, i.e. 1.54 times the wet volume

12.7 m3, i.e. 1.27 times the wet volume

Using the mix 1:1.5:3, how is the cement for 10 m3 obtained?

1/5.5 x 15.40 = 2.80 m3, i.e. 80.64 bags

What are the sand and coarse aggregate quantities for 10 m3 of M20?

Sand 4.20 m3 and aggregate 8.40 m3

Sand 8.40 m3 and aggregate 4.20 m3

Sand 3.00 m3 and aggregate 6.00 m3

Sand 2.80 m3 and aggregate 5.60 m3

What does this M20 RCC rate cover?

Concrete, formwork and reinforcement together

Concrete and reinforcement only

Concrete excluding labour and equipment

2067 Asar (old course) · 6 marks

Rate analysis: M20 (1:1½:3) RCC per 10 m³

Short answer

For 10 m³ M20 (1:1.5:3) concrete, dry volume 15.4 m³ requires 80.64 bags cement, 4.2 m³ sand, 8.4 m³ aggregate. After labour and plant, with 15% overhead and 10% profit, rate = NPR 294,800 per 10 m³ (29,480/m³).

Prepare an analysis of rate for M20 (1:1½:3) for RCC work per 10 m³.

Rates and labour norms below are illustrative (DUDBC-style); use the current District Rate for a real estimate. Cement NPR 1,000/bag, sand NPR 3,500/m³, 20 mm aggregate NPR 4,500/m³, skilled NPR 1,500/day, unskilled NPR 1,100/day, overhead 15%, profit 10%. The rate is for concrete only; formwork and reinforcement are paid separately.

Quantities for 10 m³ of M20 (1:1½:3)

Dry volume $= 1.54 \times 10 = 15.40$ m³; sum of ratio $= 5.5$
Cement $= 1/5.5 \times 15.40 = 2.800$ m³ $= 80.64$ bags
Sand $= 1.5/5.5 \times 15.40 = 4.200$ m³; aggregate $= 3/5.5 \times 15.40 = 8.400$ m³
Labour: 12 skilled and 70 unskilled days per 10 m³ (mixing, lifting, placing, vibrating, curing; assumed norm).

Analysis

Item	Qty	Unit	Rate (NPR)	Amount (NPR)
Cement	80.64	bag	1,000.00	80,640.00
Sand	4.200	m³	3,500.00	14,700.00
Coarse aggregate (20 mm)	8.400	m³	4,500.00	37,800.00
Skilled labour (mason)	12.0	day	1,500.00	18,000.00
Unskilled labour	70.0	day	1,100.00	77,000.00
Mixer, vibrator and fuel (lump)	1	LS	6,500.00	6,500.00
Water and curing (lump)	1	LS	1,200.00	1,200.00
Direct cost				235,840.00
Contractor's overhead @ 15%				35,376.00
Contractor's profit @ 10%				23,584.00
Total (rate per 10 m³)				294,800.00

Rate of M20 RCC (concrete only) = NPR 294,800.00 per 10 m³ (NPR 29,480.00 per m³).

✓ Answer checked by Claude Opus 5.5 (high effort)

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Rate analysis: M20 (1:1½:3) RCC per 10 m³

Quantities for 10 m³ of M20 (1:1½:3)

Analysis

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