5.4.1. Sieve Analysis

Try these first

1. 1.

   What is the main purpose of sieve analysis?

   Hint

   Think about why we care about the size of aggregates in concrete.

2. 2.

   What does a series of IS sieves help us classify?

   Hint

   Look for a method that involves separating particles by size.

3. 3.

   What does sieve analysis primarily determine?

   • Particle density
   • Water content
   • Particle size distribution

   Hint

   Think about what information sieve analysis aims to provide for concrete.

4. 4.

   True or False: Sieve analysis can help identify segregation in aggregate samples.

   • True
   • False

   Hint

   Consider how the distribution reveals issues in aggregate quality.

5. 5.

   A sample of coarse aggregate weighing 200 kg is passed through a series of sieves. The weights retained on each sieve are as follows: 25 mm (30 kg), 20 mm (50 kg), 10 mm (80 kg), and pan (40 kg). Calculate the percentage retained on each sieve and plot the particle size distribution curve.

   Hint

   Calculate each percentage based on the total weight of the sample.

6. 6.

   Given a sample with 60% particles below 10 mm and 40% above 10 mm, how might this affect concrete strength if this gradation is not corrected?

   Hint

   Consider how the size of particles influences the packing and strength of concrete.