IDL - International Digital Library Of Technology & Research Volume 1, Issue 5, May 2017
Available at: www.dbpublications.org
International e-Journal For Technology And Research-2017
Mix Design of High Strength Concrete by Partially Replacement of Cement by Flyash T.Divya Sree1,K.Srinivasa Rao2 1
U.G Student,2Asst. Professor,
, Department of Civil Engineering,
Sir C R R College of Engineering, Eluru,India
Abstract: Concrete is the commonly used material which is mostly used in civil engineering structures. The present investigation deals with high strength concrete of M60 by partial replacement of OPC with fly ash in percentages of 0%, 5%, 10% and 15% in various ratios and also add Masterpel 777 super plasticizer for workability purpose. After completion of experiment we have to do the compressive, Flexure and split tensile strength tests during the periods of 7,14 and 28 days. In this design project we have designed M60 grade concrete using Department of Environment (DOE) mix design method.
FLYASH: Fly ash is the ash particle resulting from the combustion of pulverised coal. These ash are collected by using electric precipitators. When compared to the fly ash, cement have high heat of hydration so some thermal cracks are produced by using cement in the concrete mixture. So the fly ash is replaced by cement to increase the strength of building and prevent the thermal cracks. The addition of fly ash has effects on many properties such as workability hydration, shrinkage, heat evolution & durability.
Keywords: High strength concrete, Fly ash, super plasticizer, DOE method. PROPERTIES OF FLYASH:
1. INTRODUCTION
Physical properties of fly ash
Concrete is made by the mixture of cement, fine aggregate, coarse aggregate and water. Strength of concrete varies depending up on the addition of water into the mixture of concrete. Using the dry Portland cement for preparing the concrete then the mixture forms a fluid slurry that can be easily poured and moulded into shape. The cement reacts chemically with the water and other ingredients to form a hard, durable stone like material such as lime based concretes are used like Portland cement concrete. Concrete is the basic building material which is widely used for many kinds of structures. Now-a-days number of structures have been designed and constructed. In this mainly High Strength concrete (HSC) are used. High strength Concrete provides economic benefits through thinner construction. If a concrete having compressive strength of greater than or equal to 41 MPA then that concrete is called High Strength Concrete (HSC).
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PARAMETERS
FLYASH
Bulk Density (gm/cc)
0.9 - 1.3
specific Gravity
1.6-2.6
Plasticity
Lower or non-plasticity
Shrinkage limit (vol stability)
Higher
Grain size
Major fine sand / silt and small per cent of clay size particles
Clay (percent)
Negligible
Free Swell Index
Very low
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