Sieve Shaker

Only available on StudyMode
  • Download(s) : 143
  • Published : September 29, 2012
Open Document
Text Preview
1.0INTRODUCTION
 Sieve analysis is a practice or procedure commonly used in civil engineering is used to assess the particle size distribution (also called gradation) of a granular material. The Size analysis is done due to that fact that it plays an important role in determining how the materials will perform in its uses. A sieve analysis can be performed on any type of non-organic or organic granular materials including sands, crushed rock, clays, granite, feldspars, coal, soil, a wide range of manufactured powders, grain and seeds, down to a minimum size. Microscopy, computerized image analysis, laser diffraction, sedimentation, and centrifugation, are some of the particle size analysis methods are other form of particle size distribution analysis techniques but sieving is preferred as a means of particle size analysis is due to a few considerations, one of the more important being that it is a primary method, i.e. one where the two principle parameters of length and weight, are directly traceable to international standards. The use of sieves with different sized mesh is one of the oldest, most reliable, and most commonly used methods for providing an analysis of particle size distribution.  Although sieve shakers have limitations based on the assumption that all particles are spherical, they work well for a wide variety of applications, and because it is relatively inexpensive, is generally the first method employed by companies when a particle size distribution analysis program is initiate

The sieve shaker works is a ways as the sample is subjected to horizontal or vertical movement in accordance with the chosen method. This causes a relative movement between the particles and the sieve, depending on their size the individual particles either pass through the sieve masher are retained on the sieve surface. The probability of a particle passing through the sieve mesh is determined by the ratio of the particle size to the sieve openings, the orientation of the particle and the number of encounters between the particle and the mesh openings.

2.0LITERATURE REVIEW

Particle analysis is the method used in analyzing individual particles. Particle size analysis (PSA) and particle distribution analysis (PDA) are 2 major proceedings in a particle analysis. PSA covers the size analysis of individual grains of particles such sand, organic granules and seeds while PDA is the analysis of the density of distribution by size of the particles. These analyses are mainly used in granule refining areas such as sand or construction material production line. It was used in determining the aggregate quality of sand and gravels ( M.S. Mamlouk and J.P. Zaniewski, Materials for Civil and Construction Engineers, Addison-Wesley, Menlo Park CA, 1999) Different material has different methods in progressing in a sieve tray analysis. These are a few types of them. 2.1Throw-action sieving

Throw-action sieve shakers are also known as vibratory sieve shakers. An electromagnetic drive sets a spring-mass system in motion and transfers the oscillations to the sieve stack. The Sample is subjected to a 3-dimensional movement and is distributed uniformly across the whole area of the sieve. The amplitude can normally be set continuously in

2.2Horizontal sieving
In a horizontal sieve shaker where the sieves move in horizontal circles in one plane. Horizontal sieve shakers are preferably used for needle-shaped, flat, long or fibrous samples, as their horizontal orientation means that only a few disorientated particles enter the mesh and the sieve is not blocked so quickly.

2.3Single sieve and sieve set sieving
The use of a single sieve, frequently also known as sieve cut, is only used to determine the percentage of undersize and oversize particles. In a single sieving process, only a single sieve with a defined mesh is subjected to the sieving movement together with a collector pan. Sieve set sieving is the process in which a...
tracking img