Research Paper Fly Ash Concrete: A Technical Analysis For Compressive Strength
Research Paper Fly Ash Concrete: A Technical Analysis For Compressive Strength
Research Paper Fly Ash Concrete: A Technical Analysis For Compressive Strength
Research Paper
FLY ASH CONCRETE: A TECHNICAL ANALYSIS FOR
COMPRESSIVE STRENGTH
Dr S L Pati11, J N Kale 2, S Suman3
mixing of fly ash upto 25%, at an interval of 5%. The becomes negligible for few days and after 28 days iit
specimens are covered with the wet gunny bags for increases uniformly. Its final strength development is
24 hours. Then after sample is removed and kept for also maximum than any other fly ash blends. After 90
curing in curing tank. k. At the end of curing period days of storage the concretes containing 10 % of fly
sample is removed and tested immediately. The ash, related to cement mass, gained a compressive
testing is done under Universal Testing Machine strength about 6 % higher than the concrete without
model no. UTM 40, Yama Engineers Kolhapur make. addition for Ordinary Portland cement. For fly ash
The load is applied smoothly and gradually. The blends greater than 10% fly ash, the rates of strength
crushing loads are noted and averagee compressive development as well as final strengths both reduce
strength for three specimens is determined for each with addition of fly ash. In long terms, concrete with
which is given in table 2. higher proportions of fly ash gains strength
3. RESULTS AND DISCUSSION: comparable with that of pure concrete.
3.1 Properties of fresh concrete: It is important to note from table 2 that the strength of
As described in $2.2, various properties of fresh concrete decreases with the increase in % of
concrete are determined. Considering space replacement of cement with fly ash at 28 days. But, at
limitations, here data sheet is not presented only 90 days we get maximum strength for 10% fly ash
results are discussed: addition.
The consistency of cement has increased with the 4. CONCLUSIONS
addition of fly ash from 32% for 0% fly ash to 48% This study proves that Deep Nagar fly ash can be
for 50% fly ash. It may be attributed to the increased successfully used in the cement concrete in minor
specific surface area of cement – fly ash blend due to amount as an additive. Considering the intangible
finer particles of the later. The initial setting time cost of disposal problem of fly ash and hidden cost of
(IST) has increased from 155 minutes for 0% fly ash environmental protection, the he methodology appears
to 250 minutes for 50% fly ash. This may be to be indeed successful. Fly ash is actually a solid
attributed to the retardation of cement hydration due waste. So, it is priceless. If it can be used for any
to fly ash. The workability of cement concrete mix purpose then it will be good for both environment
has increased from 25 mm (for 0% fly ash) to 120 and economy. Use of this fly ash as a raw material in
mm (for 25% fly ash). This may be attributed to the Portland cement is an effective means for its
soothing effect of fine fly ash particles
articles in the concrete management and leads to saving of cement and
mix. It is an encouraging result. economy consequently. Hence it is a safe and
3.2 Compressive strength of fly ash concrete environmentally consistent method of disposal of fly
The characteristic compressive strength of various ash. However the rate of strength development is
blends of concrete is presented in table no. 2. Figure less, Due to lesser rate of strength dedevelopment, fly
2 shows the graphical representation of data of o table ash finds specific application in mass concreting e. g.
no 2. dam construction. It can be concluded that power
Table 2: Compressive strength of cement – fly ash plant waste is extensively used in concrete as a partial
concrete (three sample average) replacement for cement and an admixture.
REFERENCES:
1. IS 3812-Specification for fly ash for use as pozzolona
and admixture, Part-I (2003), Part-II
II (2003)
2. IS 1727-Methods
Methods of test for pozzolanic
materials.(Reconfirmed 2004)
3. IS 456-2000
2000 Specifications for plain and reinforced
concrete.
4. Marta Kosior-Kazberuk
Kazberuk (2007) Strength Development oof
concrete with fly ash addition, Journal of Civil
Engineering and Management, ISSN1822
ISSN1822-3605 online.
5. Kulkarni V R (2007) Roll of fly ash in sustainable
development, FAUACE.
6. Murlidharrao (2007) Utilization of fly ash at Raichur
Thermal power station of Karnataka
arnataka power Corporation
Ltd, FAUACE.
7. Pachauri R K and P.V.Shridharan (1998) Looking back
to Think ahead, TERI Publication, New Delhi.
8. Ramarao S (2007) Utilization of fly ash at Raichur
Thermal power station, FAUACE.
9. Rajmane N P (2007) Fly ash based alt alternate for partial
replacement of Portland cement, FAUACE.
10. Santhakumar A R (2008) Concrete Technology, Oxford
University Press, New Delhi.
The curves in figure 2 show the rate of compressive 11. Shetty M S(2003) Concrete Technology, S.Chand and
strength development of various blends of fly ash Company Ltd, New Delhi.
concrete over a span of 90 days.
It can be seen that 0% fly ash i.e. concrete with no
replacement of cement with fly ash, has maximum
rate of compressive strength development at 60 days
and after it becomes nearly constant. 5% fly ash has
maximum rate of compressive strength th development
upto the age of 21 days and then after its rate
decreases. Strength development at later stage is
negligible. The rate of strength development is large
upto 21 days for 10% fly ash and then after its rate
IJAERS/Vol. II/ Issue I/Oct.-Dec.,2012/128-129