AN EXPERIMENTAL RESEARCH BASED ON COMPRESSIVE STRENGTH WITH PORTLAND CEMENT AND M15 AND M20 GRADE AGGREGATE
Mohd Shoeb
M.Tech, Student, RKDF College of Engineering, Bhopal Pushpendra Kumar Kushwaha
Prof., RKDF College of Engineering, Bhopal 1 NEED FOR PLASTICIZER IN QUARRY
DUST CONCRETE
Quarry smooth has harsh, sharp and specific particles and in that capability reasons a pick out up in pleasant due to better interlocking yet within the interim an attending misfortune in workability (Jayawardhane and Dissanayake 2006).
Beyond evaluations uncovered that, the quarry tidy whilst covered enormous extents straightforwardly influences the workability of the strong, in light of the fact that the quarry tidy has much less penetrability, extra surface zone and calls for extra water (Murugesan et al 2006, Naidu et al 2003a). The utilization of quarry tidy some of the time causes an expansion in the amount of concrete required to look after workability (Raman et al 2007). The quarry easy consists of a greater number of fines littler than 150μm strainer than the circulate sand (around 10 to 20% for quarry tidy and three to 5% for waterway sand). As indicated by using the rules for blend outline (SP23:1982(21)), the higher the fine totals utilized as part of cement, the better the necessity of water to appearance after workability. Every additional liter of water included over the coveted quantity in a 50kg % clump changes the water bond share by way of 0.02 - 0.03, and influences the fine of cement by 1-2N/mm2. The water bond share is the fundamental element influencing the compressive exceptional of cement at all ages. Each growth of zero.01% within the water–bond percentage diminishes the nice by means of 1-1.5N/mm2. (Santhakumar 2010).
Too much water can spark off the making of hairlike pores. As the amount of water in a mix goes up, the accompanying impacts are seen: the pleasant abatements, energy diminishes, workability expands, attachment diminishes, and the economy might also increment to the detriment of price and
large undertakings, on the way to gain the coveted workability at steady water concrete percentage, great plasticizers can be applied as part of the combination (Chitra et al 2006). Top notch plasticizers increment the workability and moreover add to beautify the compressive satisfactory of the stable (Raman et al 2007). Fantastic plasticizers are brought to moist stable blend to create outrageous workability on this manner giving streaming cement. They accomplish diminishment in the water content material without lack of workability (Shetty 2008). First-rate plasticizer atoms and bond grains resemble charged particles and consequently repulse every different. This expands the flexibility and therefore makes the flow. Tremendous plasticizers empower investment budget in concrete for a given nice (Santhakumar 2010). On this evaluation the quarry tidy strong examples have been thrown with expansion of amazing plasticizer to conquer the lessening in workability and first-rate residences. The existing paintings manages the practicality of the utilization of quarry easy as an entire substitute for common circulation sand in traditional cement with becoming measurements of remarkable plasticizer.
Fine and sturdiness checks had been executed to investigate the reasonableness of quarry easy in cement.
2 FLY ASH
Fly ash is a derivative from coal primarily based energy strength plant. The coal used in those strength plant life is in particular composed of flamable factors together with carbon, hydrogen and oxygen (nitrogen and sulphur being minor elements), and non-flamable impurities (10 to 40%) usually gift in the form of clay, shale, quartz, feldspar and limestone. At high temperature zone
the coal are burnt off, while the mineral impurities of the refuse chemically recombine to produce various crystalline phases. The molten ash is entrained in the flue gas and cools dry, whilst leaving the combustion sector (e. G. From 1500˚c to 2000˚c in seconds), into spherical, glassy particles. Maximum of these particles fly with the flue gasoline stream and are consequently known as fly ash.
The fly ash is collected in electrostatic precipitators or bag homes and the finesses of fly ash can be managed through how and where the particles are accumulated.
3. SLUMP CONE TEST
That is a take a look at used considerably in web page paintings everywhere in the paintings. The stoop check does now not degree the workability of concrete although ACI 116R – 19 describes it as a degree of consistency, but the take a look at is very useful in detecting variations inside the uniformity of a mix of given nominal proportions. The droop check is prescribed with the aid of IS: 456 (2000), ASTM C 143 90A and BS 1881 element 102:1983. The mould for the droop take a look at is a frustum of a cone, 300mm
(12inch) excessive. It's miles positioned on a easy floor with the smaller establishing at the pinnacle and filled with concrete in 3 layers. Every layer is tamped 25 times with a widespread 16mm (5inch) diameter metallic rod, rounded at the quit, and the top floor struck off by means of a sawing and rolling its base during the complete operation, that is facilitated with the aid of handles or foot rests brazed to the mildew.
Without delay after filling, the cone is slowly lifted, and the unsupported concrete will now droop hence the call of the take a look at. The lower inside the height of the slumped concrete is called stoop and is measured to the closest 5mm (1/four inch). The lower is measured to the highest factor in keeping with IS: 456- 2000 b5 1881: part 102: 1983, however to the displaced authentic middle according to ASTMC 143-90a. Which will reduce the affect on slump of the version in the surface friction, the inner of the mold and its base should be moistened at the beginning of every test, and prior to lifting of the mildew the vicinity right away across the base of the cone must be wiped clean of concrete which may additionally have dropped accidentally.
Table 1 Description of Workability and Magnitude of Slump Description of workability Slump in mm
No slump 0
Very low 5 – 10
Low 15 – 30
Medium 35 – 75
High 80 – 155
Very high 160 to collapse
Table 2 Workability of Various Concrete Mixes Design for Slump Cone Test is as Follows
Mix design codes Slump cone test in mm.
M1-MIX (normal concrete) 38 M2-MIX (10% stone dust) 42 M3-MIX (20% stone dust ) 43 M4-MIX (30% stone dust ) 45
Graph 1 Workability (Slump Cone Test in mm) 4 AIM
The intention of this experimental investigation is to observe the variation in electricity traits of concrete structural elements, for the percentage of M15 and M20 grade. In each mixes containing extraordinary probabilities of stone dirt is replaced by way of sand beginning from 0% as regular concrete, i.E. Controlled
concrete 5%,10%,15%,20%,25% and 30%, or 5% fly ash are used. The variety of specimens casted for every case is as follows:
1. Workability of concrete test like slump cone test and compaction factor test.
2. Mechanical properties like Compressive strength,
4.1 Experimental View
Table 3 Casting and Curing of M15 Grade of Concrete with 0%fly ash and 0% Stone Dust.
Sl.
No. Particular Mix
Design Code No. of
Specimen Curing
Period in days Remark
1 Cube M15 M1 9 no’s 7, 14,28 Cube size
15x15x15cm
Table 4 Casting and curing of M15 grade of concrete with 5% fly ash and 5% Sand replaced by Stone Dust.
Sl.
No. Particular Mix
Design Code No. of
Specimen Curing
Period in Days Remark
1 Cube M15 M2 9 no’s 7, 14,28 Cube size
15x15x15cm
Table 5 Casting and curing of M15 grade of concrete with 5% fly ash 10% Sand replaced by Stone Dust.
Sl.
No. Particular Mix
Design Code No. of
Specimen Curing
Period in Days Remark
1 Cube M15 M3 9 no’s 7, 14,28 Cube size
15x15x15cm
Table 6 Casting and curing of M15 grade of concrete with 5% fly ash and 15% Sand replaced by Stone Dust.
Sl.
No. Particular Mix
Design Code No. of
Specimen Curing Period in
Days Remark
1 Cube M15 M4 9 no’s 7, 14,28 Cube size
15x15x15cm
Table 7 Casting and curing of M15 grade of concrete with 5% fly ash and 20% Sand replaced by Stone Dust.
Sl.
No. Particular Mix
Design Code No. of
Specimen Curing period
in Days Remark
1 Cube M15 M5 9 no’s 7, 14,28 Cube size
15x15x15cm
Table 8 Casting and curing of M15 grade of concrete with 5% fly ash and 25% Sand replaced by Stone Dust.
Sl.
No. Particular Mix
Design Code No. of Specimen
Curing period
in Days Remark
1 Cube M15 M6 9 no’s 7, 14,28 Cube size
15x15x15cm
Table 9 Compressive Strength of Grade M15 as M1, M2, M3, M4, M5, M6
Table 10 Compressive Strength of Grade M20 as M7, M8, M9, M10, M11, M12
Mix M-1 M-2 M-3 M-4 M-5 M-6
Fly as
(%) 0 5 5 5 5 5
STONE DUST (%) 0 5 10 15 20 25
Test age
(days) 3-3 SAMPLES
COMPRESSIVE STRENGTH (N/mm²)
7 8.0
8.5 8 Av=8.1
9.6 8.5 8.6 Av=8.9
9.5 9.2 9.4 Av=9.3
9.5 9.0 9.8 Av=9.4
10.5 10.5 10.4
Av=10.4
11.2 11.0 11.4 Av=11.2
14
10.0 10.0 10.6 Av=10.2
12.5 12.0 12.0 Av=12.1
12.8 12.0 12.4 Av=12.4
12.4 12.8 12.8 Av=12.5
12.8 13.5
12.2 Av=12.8
13.0 13.2 13.5 Av=13.2 28
14 14.5
15 Av=14.5
15.8 15.2 15.8 Av=15.6
16.8 16.8 15.5 Av=16.7
17.8 17.0 16.8
Av=17.2
18.2 18.0 18.0 Av=18.0
18.5 18.5 18.8 Av=18.6
Mix M-1 M-2 M-3 M-4 M-5 M-6
Fly as(%) 0 5 5 5 5 5
STONE
DUST (%) 0 5 10 15 20 25
Test age
(days) 3-3 SAMPLES
COMPRESSIVE STRENGTH (N/mm²)
7 12.0
12.5 12.0 Av=12.1
12.6 12.5 12.6 Av=12.56
13.3 13.2 13.4 Av=13.3
13.7 13.8 13.9 Av=13.8
15.3 15.5 15.1 Av=15.3
14.8 14.0 14.4 Av=14.4 14
15.0 15.0 15.6 Av=15.2
16.7 16.8 16.9 Av=16.8
17.7 17.8 17.9 Av=17.8
18.4 18.3 18.5 Av=18.4
19.0 21.8 20.4 Av=20.4
19.2 20.5 18.5 Av=19.2
28 19.5
19.0 19.5
20.0 21.0 22.0
22.2 22.3 22.4
22 23 21
26.5 24.5 25.5
25.0 23.0 24.0
COMPRESSIVE STRENGTH VERSUS AGE.
0 5 10 15 20
7 14 28
AGE (DAYS).
COMPRESSIVE STRENGTH (N/MM2)
Normal concrete (m1) 5%fly Ash 5% Stone dust 5%fly Ash 10% Stone dust 5% Fly ash,15%Stone dust(m4) 5%fly Ash 20% Stone dust 5%fly Ash 25% Stone dust
COMPRESSIVE STRENGTH VERSUS FLY ASH AND FIBER PERCENTAGE.
0 2 4 6 8 10 12 14 16 18 20
M1 M2 M3 M4 M5 M6
FLY ASH (PERCENTAGE)
COMPRESSIVE STRENGTH (N/mm2)
7-DAYS 14-DAYS 28-DAYS
Figure 1 Compressive Strength of Grade M20 as M7, M8, M9, M10, M11, M12
COMPRESSIVE STRENGTH VERSUS AGE.
0 5 10 15 20 25 30
7 14 28
AGE (DAYS).
COMPRESSIVE STRENGTH (N/MM2)
Normal concrete (m1) 5%fly Ash 5% Stone dust 5%fly Ash 10% Stone dust 5% Fly ash,15%Stone dust(m4) 5%fly Ash 20% Stone dust 5%fly Ash 25% Stone dust
COMPRESSIVE STRENGTH VERSUS FLY ASH AND FIBER PERCENTAGE.
0 5 10 15 20 25 30
M1 M2 M3 M4 M5 M6
FLY ASH (PERCENTAGE)
COMPRESSIVE STRENGTH (N/mm2)
7-DAYS 14-DAYS 28-DAYS
4.2 Results and Discussion of Compressive Strength
4.2.1 Compressive Strength in n/mm2 of M15 AND M20 Grade
The 7 day compressive power of fly ash based totally stone dust concrete changed into observed to be high as 11.2 and 15.3 Mpa. That is greater than ordinary concrete and fly ash concrete. Further 28 day compressive electricity turned into located to be about 18.6 and 25.5 Mpa which is greater than that of regular concrete and fly ash concrete.
The impact of substitute of cement with three possibilities of fly ash and
addition of stone dust on the compressive energy of concrete is shown discern. It's far clear that the substitute of cement with 5% of fly ash reduced the compressive power of concrete. And for a particular percent of fly ash there has been a decrease in compressive power of fly ash concrete, as the share of dirt elevated from 0.25% to 0.5%. But, this reduction in energy with addition of stone dust persisted to decrease with an boom in the share of fly ash content. Typically, presence of stone dust induces porosity and reduces compressive electricity depending upon fly ash content.
