Experimental Study on Durability of Binary Blended High Strength Steel Fibre Reinforced Concrete Using Alccofine 1203 as Mineral Admixture

Abstract

Cement concrete is the most widely used material for various constructions. Properly designed and prepared concrete results in good strength and durable properties. Even such well designed and prepared concrete mixes under controlled conditions also have certain limitations because of which above properties of concrete are found to be inadequate for special situation and for certain special structures. The amount of cement production emits approximately equal amount of carbon dioxide into the atmosphere. To overcome the above ill effects, the advent of newer materials and constructions techniques and in this drive, admixture has taken newer things with various administers has become a necessity. Availability of mineral admixtures marked opening of a new era for designing concrete mix of higher and higher strength. As a result, the use of new mineral admixtures has considerably increased within the concrete industry. Hence variety of admixture such as fly ash, silica fume, rise husk ash, GGBS, metakaoline, stone dust and Alccofineetc are used with partial replacement of cement to enhance the properties of regular cement concrete. Research work has been done on the properties of durability of concrete binary blended with ALCCOFINE 1203 without steel fibres. Hence an attempt has been made in this investigation on partial replacement of cement with ALCCOFINE 1203 along with incorporation of crimped steel fibres of two aspect ratios with different percentages of the volume concrete. To attain the setout objectives of the present investigation, M50 grade concrete has been taken as reference concrete. Fresh concrete properties like slump, compaction factor and hardened concrete properties like residual compressive strength and weight loss have been studied. It is found that the Residual Compressive Strength of blended concrete is 4 to 9% greater than the OPCC mix after

immersion in HCl, 7 to 10% greater than the OPCC mix after immersion in H2SO4 and 4 to 8% greater than the OPCC mix after the immersion in MgSO4 for duration of 30 to 90 days. The loss in weight of blended concrete is 4 to 7% lesser than the OPCC mix after the immersion in HCl, 6 to 14% lesser than the OPCC mix after the immersion in H2SO4 and 5 to 7% lesser than the OPCC mix after the immersion in MgSO4 for duration of 30 to 90 days.