Question

1. Plot particle size distribution curve (You are supposed to fill the above table using MS Excel, therefore any error in the values will return zero point from the table). 2. Determine the fineness modulus of the sample and comment on what that means. 3. Based on the results of the sieve analysis, is the batch of aggregates suitable for making concrete? You are expected to go to the library to find out about grading requirements of aggregates. You can base your discussions on ASTM standard. 4. If additional 5 mm aggregates are added to the mix, would the fineness modulus increase or decrease?

Answer 1

Given (2.) Sieve size (mm) Aggregate weight size fraction (mm) retained(g) percentage fraction retained(%) cumulative Cumulative Percentage Percentage retained (0%) I finer (elo) 31.50 >31.50 116 11.6 11.6 16 > 16 88.4 86 lo1 8.6 10) 79.8 8 6.75 >4.75 20.2 30.3 42.4 121 12.1 690.7 57.6 2 >2 gg gog 52.3 47.7 1 > 113 11-3 8.5 63.6 36.4 6.5 > 0.5 85 98 908 0.25 70.25 18.1 7201 8log go.2 8.3 83 > 0.15 0.15 9.8 <0.15 pan 98 9.8 100 Total 1000 100 464.6 We know that Fineness modulus of aggregate = cumulative la retained excluding pan 100 = 464.6 - 4.646 - 40646

So, fineness modulus 4.646 4.646 is an example of coarse aggregates combination of fine ana because its values lies between 4 to 6.75. Y-axis (10) 1007 got A 80 о cumulative percentage 60 (%) eany 4ot 30 20 3 x-axis 4. 12 16 20 24 28 32 36 40 Aggregate size (mm) Figure: - Partide size aistribution curve

of the given is 4.646. As ASTM coarse say that Q4. Fineness modulus given aggregate per aggregate smaller than 38.1 mm range from 6-75 to 8.00 Fine aggregate range from FM of 2.00 to 4.00. So we can the given aggregate in combination of fine and course aggregates having intermediate values. If increase the quantity of 5mm size aggregate to the min fineness modulus will decrease. More is the size of smaller particles lesser is the fineness modules. we On the basis Q3. result of of seine analysis the batch of aggregate is not suitable for making concrete because for making good workable, dense concrete we need to have finerers modules ranging from 6.75 to 8.00. But here fineness modules of 4.646 have