1. For preparing Portland cement concrete, would you prefer round and smooth agg
ID: 1712163 • Letter: 1
Question
1. For preparing Portland cement concrete, would you prefer round and smooth aggregate or rough and angular aggregate? Briefly explain why. (5 points) 2. Given the sieve analysis results shown in the table, answer questions below Sieve Size Amount Retained 9.5 mm (3/8 in 4.75 mm (No. 4 2.36 mm (No. 8) 1.18 mm (No. 16 0.60 mm (No 0.30 mm (No. 50 0.15 mm (No Pan 0.0 10.0 65.0 125.0 75.0 110.0 100.0 15.0 a) Calculate percent retained, cumulative percent retained, and percent passing of each sieve size (10 points) b) Calculate Fineness Modulus (5 points) c) Does this aggregate meet ASTM C33 grading requirement? Explain. (5 points)Explanation / Answer
1. For preparing Portland cement concrete we would prefer rough and angular aggregate because the surface area of round aggregate is the least so the binding propoerties of a angular aggregate will be high as compared to round aggregate.
2.
b) Fineness modulus of sample = sum (cumulative % retained) / 100
= 386/100 = 3.86
Sieve Size Amount Retained (B) gram Percent Retained [C= (B/500)*100] Cumulative retained gramD Cumulative % Retained [E=(D/500)*100] Percentage Passing
[F = 100-E] 9.5 mm 0 0% 0 0% 100% 4.75 mm 10 2% 10 2% 98% 2.36 mm 65 13% 75 15% 85% 1.18 mm 125 25% 200 40% 60% 0.06 mm 75 15% 275 55% 45% 0.03 mm 110 22% 385 77% 23% 0.15 mm 100 20% 485 97% 3% Pan 15 3% 500 100% 0% TOTAL 500 100% 386%
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