International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 04 Issue: 07 | July -2017
p-ISSN: 2395-0072
www.irjet.net
Comparative Study of Compressive Strength of Concrete with Fly Ash Replacement by Cement Mohammad Abushad¹, Misbah Danish Sabri², ¹Deptt. Of Civil Engineering, AFU, Faridabad, Haryana, INDIA. ²Assistant Professor Dept. Of Civil Engineering, AFU, Faridabad, Haryana, INDIA. ---------------------------------------------------------------------***--------------------------------------------------------------------Mound Ash: Fly ash and bottom ash or both mixed in Abstract - Fly Ash is residue material Produced by thermal any proportion and deposited in dry form in the shape power plants is such a big environmental threat. The investigation report in this paper is carried out to study the of a mound is termed as mound Ash [5][6][7][8]. utilization of fly ash in cement concrete as a ingredient of cement as well as an additive so as to provide an environmentally consistent way of its disposal and reuse. Cement in concrete mix design is replaced by fly ash as 0%, 10% 20% 30% ,40% 50% and maximum strength in 30% for replacement of cement. It is stimulated that replacement of cement in any proportions earlier higher the compressive strength of concrete and later lower the compressive strength as well as slow its hardening. And also increase the workability and setting time of concrete.
1.1 Chemical Properties It is spherical in shape and solid in state, ranges in size from 0.5µm-300µ. The major constituents of fly ash are silica (SiO₂), Al min (Al₂O₃), F i Oxid (F ₂O₃) nd C l i m Oxide (CaO). The other minor constituents of fly ash are MgO N ₂O, K₂O, SO₃, MnO, TiO₂, nd n n C on. Th variation in the principal constituents is about Silica (2560%), Alumina (10-30%) and Ferric Oxide (5-25%).When the sum of these three principal constituents is 70% or more if calcium oxide is less than 10% -Technically the fly ash is considered As siliceous fly Ash or class F fly ash. Such type of fly ash is produced by burning of anthracite or bituminous coal having pozzolanic properties. If some of these constituents is more than 50% and reactive calcium oxide is not less than 10% , fly ash will be considered as calcareous fly ash also called Class C fly Ash. This type of fly Ash is produced by burning of ignite or sub-bituminous coal and possess both pozzolanic and hydraulic properties [9][10].
Key Words: M-30 Concrete, Fly Ash Cement, Water, Compressive strength test.
1. INTRODUCTION Fly ash is one of the naturally occurring from combustion of coal & emission of volcanic ash. In hitech electric plant when coal burned at high temperature near F non om i l min l occur from burning coal from bottom ash which is classified as fly Ash. Fly Ash is the material that is carried off with flue gases, where it is collected by electric precipitator, on the method of burning the fly Ash Residue varies[1][2][3][4].
1.2 Physical Properties Fly ash particles are generally glassy Solid or hollow and spherical in shape. The hollow spherical particles called as cenospheres . The fineness of individual fly ash particle range from 1 micron to 1 mm size. The fineness of fly Ash particles has a significant influence on its performance in cement concrete[11].
Fly Ash: This kind of ash is extracted from flue gases through Electrostatic Precipitator in dry form. This ash is fine material & possesses good pozzolanic property.
The fineness of particles is measured by specific surface area of fly ash by Blaine's specific area technic .Greater the surface area more the fineness of fly ash. The specific gravity of fly ash varies over a wide range of 1.9 to 2.55[12][13].
Bottom Ash: This kind of ash is collected in the bottom of boiler furnace. It is comparatively coarse material and contains higher un burnt carbon. It possesses zero or little pozzolanic property.
1.3 Pozzolanic Properties
Pond Ash: When fly ash and bottom ash or both mixed together in any proportion with the large quantity of water to make it in slurry form and deposited in ponds where in water gets drained away. The deposited as his called as pond ash. © 2017, IRJET
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Impact Factor value: 5.181
Fly Ash is a pozzolanic material which is defined as siliceous or siliceous and aluminous material which in itself possesses little or no cementitious value, chemically react with Calcium Hydroxide (lime) in presence of water at ordinary temperature and form soluble compound comprises cementitious property similar to cement.
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