A Study On Partial Replacement of Cement With Ggbs in Concrete
A Study On Partial Replacement of Cement With Ggbs in Concrete
A Study On Partial Replacement of Cement With Ggbs in Concrete
GGBS IN CONCRETE
1
S.Revathy,M.E., 2Poovarasan.A, 3Prabhaharan.P.G, 4Prabhakaran.K.B, 5Sivaraj.O.R
1
Assistant Professor, Department of Civil Engineering,
Muthayammal Engineering College, Rasipuram, Namakkal.
2,3,4,5
Bachelor Of Engineering. Civil Engineering
Muthayammal Engineering College, Rasipuram -637408, Anna University: Chennai 600 025
1 4.75 mm 0.020 2% 2%
2 2.36 mm 0.040 4% 6%
3S 1.7 mm 0.070 7% 13%
4 1.18 mm 0.130 13% 26%
5 600micron 0.300 30% 56%
6 300micron 0.260 26% 82%
7 150micron 0.100 10% 92%
8 Pan 0.080 8% 100%
4.23
Weigh all sieves and the pan separately. Pour fraction retained on the sieve is also weighed
the soil into the stack of sieves from the top and (mass C). If {A-(B+C)}>1 gram, the result shall
place the cover, put the stack in the sieve shaker be discarded and a fresh test made. The
and fix the clamps, adjust the time on 10 to 15 aggregate impact value (AIV) is
minutes and get the shaker going. AIV = (B/A) x100
Fineness modulus = 4.23 CALCULATION
3.4COARSE AGGREGATE Aggregate impact value= (B/A) x100
Usually the aggregates occupy 70% to Weight of fraction passing 2.36mm sieve B =
80% of the volume of concrete and have an 115 gm.
important influence on its properties. They are Total weight of sample A= 640 gm.
granular materials, derived generally from Aggregate impact value= 17.9%
natural rock and sands.
3.4.1 IMPACT TEST: 3.4.2. SPECIFIC GRAVITY TEST:
The apparatus consists of a steel test Obtain approximately 1000g of the
mould with a falling hammer. The hammer coarse aggregate from the sample by use of
slides freely between vertical guides so sample splitter or by quartering. Dry it in a
arranged that the lower part of the hammer is suitable pan or vessel to constant weight at a
above and concentric with the mould. The temperature of 100 to 〖110〗^0 c . Wash the
material used is aggregate passing a 12.70 mm sample thoroughly on a 71mm sieve. The
sieve and retained on a 9.52 mm sieve. It shall process of quartering and the correct use of a
be clean and dry (washed if necessary) but it sample splitter are discussed in the manual of
must not be dried for longer than 4 hours nor at concrete testing (Annual Book of ASTM
a temperature higher than 110OC may Standards, part 14). Allow the sample to cool
otherwise certain aggregates be damaged. The comfortable handling temperature, cover with
whole of the test sample (mass A) is placed in water and permit to stand for 24 ± 4 hours.
the steel mould and compacted by a single Where the absorption and specific gravity
tamping of 25 strokes of the tamping rod.. The values are to be used in proportioning concrete
test sample is subjected to 15 blows of the mixtures with aggregates used in their naturally
hammer dropping 381 mm, each being moist condition, the requirement for initial
delivered at an interval not less than one drying to constant weight may be eliminated.
second.. The crushed aggregate is sieved over a Decant excess water with care to avoid
2.36 mm sieve. The fraction passing 2.36 mm is loss of fines, spread the sample on a flat surface
weighed to the nearest 0.1 g (mass B). The exposed to a gently moving current of warm air,
1 19 mm Nil 0% 0%
2 12.5 mm Nil 0% 0%
3 9.5 mm 0.240 24% 24%
4 4.75 mm 0.600 60% 84%
5 2.36 mm 0.060 6% 90%
6 1.18 mm 0.040 4% 94%
7 0.6 mm 0.050 5% 99%
8 0.3 mm 0.010 1% 100%
9 Pan Nil nil 100%
3.85
COMPRESSIVE STRENGTH
30 28.08
26.64 27.36 26.96
25
20.21 20.84
19.68 19.92
20
16.64 17.26
16.24 16.36
15
10
0
CONVENTIONAL GGBS 30% GGBS 40% GGBS 50%
7 DAYS 14 DAYS