SIEVE ANALYSIS OF AGGREGATE

 SIEVE ANALYSIS

         The size of aggregates is first qualified by the size of square sieve opening through which an aggregate may pass, and not by shape. Aggregates which happen to fall in particular size range may have rounded, cubical, angular, flaky or elongated shape of particles.

         Rounded particles may be preferred in cement concrete mix due to low specific surface area & better workability for the same proportion of cement paste & same water cement ratio.

SIEVE ANALYSIS (Coarse Aggregates 40 mm)

Sieve Analysis for Coarse Aggregates 40 mm to be used in concrete mix (1:4:8) for P.C.C. work.

·         Firstly, an aggregates sample (5 kg.) is taken.

·         IS sieves are arranged in proper sequence.

·         Sieves are set on Sieve-Shaker Machine.

·        The sample of aggregates is sieved through set of sieves & separated into specified size range.

                   

                                              

                                                      Fig:Showing Sieve-Shaker

                             Table:-observation table for sieve analysis(coarse aggregate)

Sr. No.	Sieve Designation	Wt.         Retained On      Sieve (gm.)	Cum. Wt. Retained on Sieve(gm)	% Cum.   Wt. Retained on Sieve(gm)	% Passed	Std. as   per IS: 383:1970
1	80 mm	0	0	0	100	100
2	40 mm	80	80	1.6	98.4	95-100
3	20 mm	2600	2680	53.60	46.40	30-70
4	12.5 mm	-	-	-	-	-
5	10 mm	1200	3880	77.60	22.40	10-35
6	4.75 mm	1050	4930	98.60	1.40	0-5
7	2.36 mm
8	1.18 mm
9	600 micron
10	300 micron
11	150 micron
12	Pan	70

RESULT:- The aggregates are applicable for concrete mix & Silt is 70  gm.

SIEVE  ANALYSIS (Fine Aggregates)

·         Firstly, a Fine aggregates sample (Sand) of wt. 1 kg. is taken.

·         IS sieves are arranged in proper sequence.

·         Sieves are set on Sieve-Shaker Machine,

·         The sample of aggregates is sieved through set of sieves & separated into specified size range.    

                            Table:-Observation table for sieve analysis(fine aggregate)

Sr. No.	Sieve Designation	Wt.       Retained On      Sieve (gm.)	Cum. Wt. Retained on Sieve(gm)	% Cum.    Wt. Retained    on Sieve(gm)	% Passed	Std. as per IS: 383:1970
1	80 mm
2	40 mm
3	20 mm
4	12.5 mm
5	10 mm	0	0	0	100	100
6	4.75 mm	17	17	1.7	98.3	90-100
7	2.36 mm	20	37	3.7	96.3	85-100
8	1.18 mm	139	176	17.6	82.4	75-100
9	600 micron	170	346	34.6	65.4	60-79
10	300 micron	371	717	71.7	28.3	12-40
11	150 micron	248	965	96.5	3.5	0-10
12	Pan	35

RESULT:- The aggregates are applicable for concrete mix. & Silt content is 35 gm.