Sieve Tests on Aggregates, Summaries of Civil procedure

A laboratory exercise on sieve tests for determining the particle size distribution of aggregates and fillers. It covers the main principles, materials and equipment required, sample preparation, and the step-by-step dry sieving method. The exercise includes calculations to determine the percentage of material retained on each sieve and the cumulative percentage passing each sieve. The results are then plotted on a semi-logarithmic chart to obtain the grading curve. This laboratory exercise is designed to provide students with hands-on experience in the fundamental techniques used to characterize the particle size distribution of construction materials, which is crucial for understanding their properties and performance in various applications.

Typology: Summaries

2022/2023

Uploaded on 03/02/2023

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CE 2 โ€“ CONSTRUCTION MATERIALS AND TESTING
LABORATORY EXERCISE NO. 4
SIEVE TESTS ON AGGREGATES
Name: Date:
Block: Schedule:
Group Members:
Objective:
The particle size distribution of samples of aggregates and fillers are done by sieving.
Main Principles:
For coarse and fine aggregates free from particles, which cause agglomeration, Dry Sieving may be
performed.
Materials and Equipment:
๏‚ท Test sieves with diameter 450 mm or 300 mm; 75 mm, 63 mm, 50 mm, 37.5 mm, 28 mm, 14 mm, 10
mm, 6.3 mm, 5 mm
๏‚ท Lids and receivers
๏‚ท A balance readable and accurate to 0.5 g
๏‚ท Riffle boxes
๏‚ท Metal containers
๏‚ท Metal trays
๏‚ท Scoop
๏‚ท Sieve brushes
๏‚ท Mechanical sieve shaker (optional)
Sample Preparation:
Dry the test portion by heating at a temperature of 105ยฐC for minimum of 12 hours. Allow to cool, weigh and
record as m1.
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CE 2 โ€“ CONSTRUCTION MATERIALS AND TESTING

LABORATORY EXERCISE NO. 4

SIEVE TESTS ON AGGREGATES

Name: Date: Block: Schedule: Group Members: Objective: The particle size distribution of samples of aggregates and fillers are done by sieving. Main Principles: For coarse and fine aggregates free from particles, which cause agglomeration, Dry Sieving may be performed. Materials and Equipment: ๏‚ท Test sieves with diameter 450 mm or 300 mm; 75 mm, 63 mm, 50 mm, 37.5 mm, 28 mm, 14 mm, 10 mm, 6.3 mm, 5 mm ๏‚ท Lids and receivers ๏‚ท A balance readable and accurate to 0.5 g ๏‚ท Riffle boxes ๏‚ท Metal containers ๏‚ท Metal trays ๏‚ท Scoop ๏‚ท Sieve brushes ๏‚ท Mechanical sieve shaker (optional) Sample Preparation: Dry the test portion by heating at a temperature of 105ยฐC for minimum of 12 hours. Allow to cool, weigh and record as m 1.

DRY SIEVING METHOD โ€“ Test Procedure

  1. Assemble appropriate sieves with a receiver at the bottom in increasing aperture size from bottom to top. Place the dried sample on top of the coarsest sieve and cover with a lid.
  2. Either by hand or mechanical sieve shaker shake the sieves for a sufficient time to separate the sample into the different size fractions.
  3. Sieving is done by hand by starting with the coarsest sieve and shake over a clean tray or receiver until no more material passes.
  4. Weigh the material retained on each sieve, together with any material cleaned/picked from the mesh, on completion of sieving on that sieve. Calculations
  5. Calculate the mass retained on each sieve as a percentage of the original dry mass (m 1 ). Example: Percentage retained on 10 mm sieve = ๐‘š( 10 ๐‘š๐‘š)( 100 ๐‘š 1
  1. Calculate the mass of the sample passing each sieve as a cumulative percentage, from the general relationship: % ๐‘๐‘Ž๐‘ ๐‘ ๐‘–๐‘›๐‘” ๐‘กโ„Ž๐‘–๐‘  ๐‘ ๐‘–๐‘’๐‘ฃ๐‘’ = %๐‘๐‘Ž๐‘ ๐‘ ๐‘–๐‘›๐‘” ๐‘๐‘Ÿ๐‘’๐‘ฃ๐‘–๐‘œ๐‘ข๐‘  ๐‘ ๐‘–๐‘’๐‘ฃ๐‘’ โˆ’ % ๐‘Ÿ๐‘’๐‘ก๐‘Ž๐‘–๐‘›๐‘’๐‘‘ ๐‘œ๐‘› ๐‘ ๐‘–๐‘’๐‘ฃ๐‘’
  2. Plot the grading as a curve on a semi-logarithmic chart. Tabulation: Initial Dry mass g BS Test sieve Mass Retained (g) ๐‘ƒ๐‘’๐‘Ÿ๐‘๐‘’๐‘›๐‘ก๐‘Ž๐‘”๐‘’ ๐‘Ÿ๐‘’๐‘ก๐‘Ž๐‘–๐‘›๐‘’๐‘‘ = (

Cumulative percentage passing 75 mm 63 mm 50 mm 37.5 mm 28 mm 20 mm 14 mm 10 mm 5 mm 2 mm Total mass