Question

A Sieve analysis test was performed on a sample of coarse aggregate and produced the results in Table P5.22

a) Calculate the percent passing through each sieve.

b) What is the maximum size?

c) What is the nominal maximum size?

d) plot the percent passing versus sieve size on a semilog gradation chart.

e) Plot the percent passing versus sieve size on a 0.45 gradation chart.

f) Referring to Table 5.5 (ASTM C33), what is the closest size number and does it meet the gradation for the standard size?

TABLE P5.22 0 Sieve Size, mm 75. 50.0 37.5 25.0 19.0 12.5 9.5 4.75 Pan Amount Retained, g 0 0 1678 7212 5443 6124 12111 4581 590

Answer 1

a)

Sieve Opening 10.45 Mass Retained on Each Sieve % Mass Retained Cumulative % Retained 0.00 COD 75 156.23 00D Percent Finer 101CD 101.6D 95.55 76.44 130.18 0.00 50 37.5 11437 1618 7212 445 19.11 14.42 16.33 4.45 23.56 37.98 54.2 19 5443 95.30 84.22 69.76 61.66 45.13 62.02 12.5 6124 45.79 9.5 12111 32.09 13.70 475 4581 86.30 98.44 87.86 12.14 1.56 1.56 Pan 59.1 12.14 Total 37769

b) The smallest sieve opening through which the entire amount of aggregate is required to pass is called the maximum size.

maximum size = 50.0 mm

c) The smallest sieve opening through which the entire amount of aggregate is permitted to pass is called the nominal maximum size.

Nominal maximum size = 37.5 mm

d)

100.00 90.00 80.00 | | | | | | 70.00 60.00 Percent Finer 40.00 30.00 | | | | | | | | | | | | | | | | | | | 20.00 10.00 0.00 10 100 Sieve Size (mm)

e)

100.00 90.00 | | | | | | | | | 80.00 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 70.00 | | | | | | | | | | | | | | | | | | | | | | | 60.00 Percent Finer |||||||||||||||||||||||||||||||||||||||||||||||||| 40.00 ||||||||||||||| |||||||||||||||||||||||||||||||||||||||| LLLLLL||||||||||||||||||||||||||||||| 30.00 || 20.00 | | | | | | | | | | | | | | | | | | | | ||||||||||| 10.00 0.00 20 40 60 80 100 120 140 160 180 u+0.45
f) Closest size number = 357

it doesn't meet the gradation of standard size