IMPROVING THE MECHANICAL PROPERTIES OF BOTTOM ASH BASED CONCRETE BY INCORPORATING ALCCOFINE

Abstract

Concrete is the most commonly utilized construction material in today’s development. Waste material like slag, fly ash, etc. can be utilized in concrete as replacement of its constituents that can be economical in nature. Huge amount of bottom ash is gathered from the thermal power plants as an industrial by product. Disposal of the bottom ash in environment is hazardous in nature and generate different types of human health diseases. Bottom ash as waste material can be disposed in concrete as replacement of river sand. Alccofine is used as Supplementary Cementitious Material (SCM) and it is also known as new generation ultrafine particle. Alccofine helps in improvement of the cementitious properties of concrete mix and helps in gaining strength of concrete. This study was carried for the improvement of the mechanical properties of Bottom ash based concrete incorporating Alccofine. The objectives of this study were as follows: (a) Effect of inclusion of Alccofine for improving the strength
of bottom ash based concrete. (b) To determine mechanical properties of concrete: compressive, split tensile and flexural strengths. Experimental program consists of collection of materials from nearby sources i.e. Bottom ash collected from NTPC Badarpur Border, New Delhi and Alccofine was collected from the local dealer of Gurugram, Haryana. After collection of the material calculation of mix design of M40 grade was prepared with guidelines of IS 456:2000 and IS10262:2009. Replacement of bottom ash with sand was done in different proportions i.e. 10, 20 and 30% in M40 grade of concrete mix. Alccofine was partially replaced with cement up to 10% in every mix of concrete instead of control mix. These mixes specimens were prepared for testing compressive, flexural and Split tensile strengths at the ages of curing 7, 14 and 28 days. Results of experimental program showed that inclusion of alccofine in bottom ash based concrete improved the strengths of different types of concrete mixes. The workability of concrete reduced with the use of coal bottom ash as a replacement of fine aggregate. The above observation of this experimental investigation indicated that addition of bottom ash beyond 30% in concrete resulted in decreased mechanical strength. Whereas Alccofine can be used for the improvement of cementitious properties of concrete and bottom ash can be replaced by sand up to 20% with Alccofine.