International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 03 | Mar -2017
p-ISSN: 2395-0072
www.irjet.net
A BRIEF STUDY ON THE STRENGTH PROPERTIES OF CONCRETE MODIFIED WITH SINTERED FLY ASH AGGREGATES AND SILICON DIOXIDE (NANO MATERIAL) S. RAMESH REDDY1, K. THEJAKALA2, Dr. V. BHASKAR DESAI3 1Professor,
Dept. of Civil Engineering, Brindavan Institute of Technology & Science, Kurnool, A.P and Research Schloar , JNTUA College of Engineering, Anantapuram-515002, A.P. 2M.Tech
3Professor,
Student, JNTUA College of Engineering, Anantapuram – 515002, A.P
Dept. of Civil Engineering, JNTUA College of Engineering, Anantapuram-515002, A.P.
---------------------------------------------------------------------***--------------------------------------------------------------------1. INTRODUCTION Abstract :With the ever increasing demand for electricity as energy source due to rapid industrialization and
Disposing of the waste fly ash which results from burning
urbanization there is a growing need for disposing of the
coal is a major problem especially severe in India, the
resulting waste fly ash from burning of coal in Thermal plants.
world’s second largest coal consumer, which produces an
A mix design was done for M20 grade concrete by IS code
estimated 150 million tons of fly ash per annum. The process
methods. ACC 53 grade cement was used and natural
which converts waste fly ash into structural light weight
aggregate is fully replaced with Sintered fly ash aggregates. In
aggregate, a product which can be used to electronically
this experimental investigation partial replacement of cement
replace mined stone in concrete, as well as other uses. The
(11%)with three number of pozzolanic materials like silica
process uses approximately 95% fly ash mixed in some cases
fume, slag and fly ash in equal proportions along with varying
with water and in some cases a small volume of additives.
percentages of Nano silicon dioxide at 0, 0.5, 1 and 1.5 on 11%
After agglomeration and pelletizing, the green pellets are
of pozzolanic materials. Silicon dioxide possesses more
Sintered, creating an aggregate whose characteristics are
pozzolanic action. Because of pozzolanic action, silicon dioxide
superior to natural aggregates.
reacts with free lime during hydration and produces more C-S-
The basic purpose of using Nano sized materials in concrete
H gel. After 28 days, various tests has been carried out i.e
is to improve compressive and flexural strengths at early
compressive strength test, flexural strength test, modulus of
age, it is possible due to the high surface to volume ratio. It
elasticity test, impact test, Mode-II fracture test for concrete
also helps to improve the pore structure of concrete. Nano
with silicon dioxide and without silicon dioxide. The concrete
sized materials help to reduce porosity as they absorb less
made with silicon dioxide gives better results compared to
water compared to traditional cementitious materials. The
without silicon dioxide.
presence of Nano materials reduces the amount of cement content in concrete than the conventional concrete. This can be achieved without sacrificing strength characteristics;
Key Words: Sintered fly ash aggregates, admixtures, ACC 53
thereby it is possible to produce ecofriendly concrete called
grade, concrete, silicon dioxide, various tests
green concrete. Light weight aggregate preparation is shown in plate 1.
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