EXPERIMENTAL INVESTIGATION ON CONCRETE USING FLY ASH AND GBFS  AS PARTIAL REPLACEMENT OF CEMENT

Authors

Concrete is mainly classified into three types based on the density. Concrete containing natural sand and gravel or

crushed- rock aggregate and water, when placed in the skeleton of form and allowed to cure, becomes hard like stone.

Generally weighing about 2400kg/m3 is called “normal-weight concrete” and it is the most commonly used concrete for

structural purposes. For applications where a higher strength-to-weight ratio is desired, it is possible to reduce the unit

weight of concrete by using natural aggregate with lower bulk density. The term lightweight concrete is used for concrete

that weightless than 1800 kg/m3 . Heavy weight concrete used for radiation shielding, is a concrete produced from high

density aggregate and generally weigh more than 3200kg/m3 .

Our aim it is to study the properties of concrete by partially replacing cement by fly ash and fine

aggregate (sand) by granulated blast furnace slag.

In this study, Cement was partially replaced by Fly Ash and Fine aggregate were partially replaced by

Granulated Blast Furnace Slag in concrete. A mix design was done for M20 grade of concrete by using IS method. The

utilization of fly-ash and blast furnace slag in concrete as partial replacement of cement and fine aggregate (sand) is

gaining immense importance in today’s concrete works, mainly on account of the improvement in long term durability

along with ecological benefits. Three grades of ordinary port land cement (OPC) namely: 33, 43 and 53 as classified by

bureau of Indian Standard (BIS) or commonly used in construction industry. Now in this project only 53 grade of cement

is used. This paper reports comparative study on effects of concrete properties by partially replacement of OPC of 53

grades with fly ash and sand were partially replaced by blast furnace slag. The main variable investigated in the study of

variation of fly ash dosage of 10% and slag dosage of 10%, 20%, 30%, fly ash dosage of 20% and slag dosage of 10%, 20,

30%, fly ash dosage of 30% and slag dosage of 10%, 20%, and 30%. The compressive strength and split tensile strength

& acid attack of concrete were mainly studied. Test results shows that, inclusion of fly ash and GBFS generally improves

the concrete properties up-to certain percentage of replacement in53 grade of cement.