Material Testing Equipment Malaysia | Material Testing Equipment Malaysia | Material Testing Equipment Malaysia

In this approach, a pre-established quantity of substance is positioned on a collection of interlocking sieves, systematically arranged in descending order of size from the highest to the lowest. These sieves are subsequently subjected to mechanical agitation for a predetermined period. Following the agitation, the operator measures theN mass of material held by each sieve utilizing one of t wo approaches:

• Cumulative Method : 
  Every sieve fraction, beginning with the coarsest one, is d eposited into a pre-weighed pan and measured. This sequence goes on until all the fractions, including the base pan, have been in corporated and weighed. This approach saves time and is convenient since there is no necessity to repeatedly empty or tare the pan on the scale.
  
  
• Fractional Method : 
  The examiner individually measures the contents of each sieve fraction and defers discarding materials until the entire test is completed.

The technician then computes the percentage of the retained material and passes through each sieve, rounding to the closest 0.1%, using the total mass as the basis. The calculations are carried out in th e below manner:

• Cumulative Method : 
  As you incorporate each held fraction, divide the cumulative mass by the overall sample mass and then multiply the result by 100 to determine the percentage retained. To calculate the percentage passing, simply deduct the cumulative percentage retained for a particular sieve from 100.
  
  
• Fractional Method : To calculate th e retained percentage, divide the mass held on e ach sieve by the total mass, and then multiply the result by 100. To find the percentage passing, subtract the percentage retained on the sieve directly below.

Particle gradation, also known as particle size distribution, pertains to the scattering of various particle sizes within a sample. Usually, this information is graphically depicted by plotting particle sizes on a semi-logarithmic chart and linking them with a curve that optimally fits the data. For detailed guidance, kindly refer to ASTM C136 (AASHTO T-27).

To ensure precision in your coarse aggregate sieve analysis, consider the following equipment options:

Follow these essential tips to ensur e accurate results in your coarse aggregate sieve analysis:

• Avoid Overloading Sieves:
  To avoid mesh clogging and ensure precise outcomes, the material remaining on a sieve after completion should not surpass a depth of one to two layers. If n ecessary, add an extra coarse sieve to reduce the load on the lower sieves.
  
  
• Allow Sufficient Shaking Time:
  Achieve thorough separation by allowing sufficient duration on a sieve shaker or testing screen. A common guideline involves weighing the fraction, continuing the processing for an extra minute, and then reweighing it. If th e disparity in per cent passing exceeds 1%, consider prolonging the processing time.
  
  
• Beware of Material Degradation:
  Brittle or friable substances prone to breakage during separation can introduce inaccuracies. Adjust shaker intervals or explore alternative methods.
  
  
• Regularly Inspect Sieves:
  To prevent bias in test results, regularly check sieves for wear, torn mesh, or distorted openings.
  
  
• Exercise Care When Transferring Material:
  Prevent material loss by handling transfers to the tare weighing pan with care.
  
  
• Don't Forget to Pre-Dry Your Sample:
  Ensure sample accuracy by pre-drying your material.
  
  Mastering coarse aggregate sieve analysis is essential for quality control and achieving reliable results in construction and other industries. Proper equipment, meticulous procedures, and attention to detail can make all the difference in ensuring your aggregates meet the intended specifications.