4. Following data refers to specifie gravity test of aggregates. Calculate thesg

Question

4. Following data refers to specifie gravity test of aggregates. Calculate thesgravity 10 10 Points specific gravity Weight of empty pycnometer Weight of pycnometer + sand Weight of pycnometer+sand+ water Weight of pycnometer+ water - 156 gm 2 an = 188 gm 220 gm =200 gm 7 5 Points 5. What is the standard value of specific gravity for course and fine aggregates? Following result refers to absorption test of fine aggregates. Calculate the percentage absorption of t given fine aggregate 6. 10 Points = 120 gm Weight of empty bowl Weight of bowl + fine aggregates (dry) 155 gm Weight of bowl+24 hours soaked aggregates 158 gm

Explanation / Answer

4) Given, Empty weight of pycnometer, W1 = 156 gm

weight of pycnometer+sand, W2 = 188 gm

weight of pycnometer+sand+water, W3 = 220 gm

weight of pycnometer+water, W4 = 200 gm

We know that,

specific gravity, G = (W2-W1)/((W2-W1)-(W3-W4)) = 32/(32-20) = 32/12 = 2.67

5) Standard value of specific gravity for coarse and fine aggregate is 2.6 .

6) Weight of empty bowl = 120 gm

Weight of bowl+fine aggregates (dry) = 155 gm, weight of fine aggregates (dry) = 155 - 120 = 35 gm

Weight of bowl+24 hour soaked aggregates = 158 gm, weight of 24 hour soaked aggregates = 158 - 120 = 38 gm

Percentage absorption of fine aggregates (% of dry weight) = (weight of 24 hour soaked aggregates - weight of fine aggregates (dry))/weight of fine aggregates (dry)) = ((38-35)/35)*100 = 8.57%

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