Assessment of Construction in Concrete by Mixing Activator Material- A Review

The utilization of fly ash in concrete as partial replacement of cement is gaining immense importance today, mainly on account the improvements in the long – term durability of concrete combine with ecological benefits. Technological improvements in thermal power plant operation and fly ash collection system have resulted in improving the consistency of fly ash. In this paper the effect of fly ash on compressive strength is studied. Today, fly ash is used in high-way bridges and has been used on regular basis to produce high performance concrete. High performance concrete can be defined as a concrete in which certain characteristics are developed for particular application and environment. Examples of these characteristics are ease of placement, compaction without segregation, early age strength, long-term mechanical properties, permeability, density, heat of hydration long life severe environments. Many concrete mixes are now available to produce high performance concrete for pre-cast. Bridge girders. Most of these mixes have been designed based primarily strength criteria. Durable concrete is usually archived because of low permeability associated with high strength concrete and use of combination of cementitious materials such as fly ash. To carry this project concrete cube were casted. The concrete cubes are placed in water tank for the curing for 7 days, 14 days and 28 days. Concrete cubes were then tested with compression strength test. These tests were conducted to insure the quality of material, to reduce the cost and the important thing is to reduce the parties involved from having the problem at the next stages. These investigation shows that by using fly ash as replacing material with cement is suitable and can be used in construction industries. In these we are using NaoH (Sodium hydroxide) as activator in concrete. It increases strength of concrete. It reduces settling time of concrete.