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This is a group for the staff and students of Civil Engineering students of 2009 at Shar

for communication between the students and the faculty. Although it is one way (facu

extend the same to two-way communication. For any comments, write to me at satya

Tuesday, April 19, 2011

AIM: Sieve analysis of the given sample of coarse aggregate and determine the fineness

modulus.

THEORY:

Coarse aggregate is the broken stone used in concrete .The coarse aggregate unless mixed with

fine aggregate serves no purpose in cement works .the size of fine aggregate is limited to a

maximum of 4.75 mm gauge beyond which it is known as coarse aggregate .

FINENESS MODULUS:

Fineness modulus is only a numerical index of fineness, giving some idea of the mean size of the

particle s in the entire body of the aggregate. To a certain extent it is a method of standardization

of the grading of the aggregate. It is obtained by adding the percentage weight of material

retained in each of the standard sieves and dividing it by 100.

To object of finding the fineness modulus is to grade a given aggregate for the most economical

mix and workability with minimum quantity of cement .Certain limits of fineness modulus for fine

coarseaggregates are given in the table below and a sample under test should satisfy these

results so that the aggregate may give good workability under economical conditions.

LIMIT OF FINENESS MODULUS

Maximum size of aggregateFineness modulus

Minimum Maximum

T

B

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Posted by Prof. Satyaprakash at 10:17 AM

If the test aggregate gives higher fineness modulus the mix will be harsh and if on the other hand

gives a lower fineness modulus it gives uneconomical mix .

APPARATUS:

Indian standard test sieves, weighing balance ,sieve shaker etc .

Size of sieves to be used.

(II) For coarse aggregate-25mm,20mm 12.5mm, 10mm, 4.75mm.

PROCEDURE

COARSEAGGREGATES

(i)Take one kg of coarse aggregate

(ii)Arrange the sieves one over the other in relation to their size of opening.

(25mm,20mm,12.5mm10mm,4.75mm)

(iii) Carry out the sieving for the specified time

(iv) Find the weight of agggregate retained on each sieve taken in order and tabulate in table.

GRAPH

Draw a graph with sieve opening to log scale on the X-axis and % finer on Y-axis .The curve

iscalled a grading curve.

CALCULATION

COARSEAGGREGATE

3. Fineness modulus (Sum of cumulative % wt retained /100) =

RESULT S

COARSEAGGREGATES

Fineness modulus =

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Engg Group of 2009 at Sharda University http://shardacivil.blogspot.in/2011/04/experiment-no-7-aim-sieve

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