STUDY ON STRENGTH AND DURABILITY PROPERTIES OF TERNARY BLENDED HYBRID FRC
Journal Title: International Journal of Civil Engineering and Technology - Year 2019, Vol 10, Issue 3
Abstract
Cement concrete is the most widely used material for various constructions. Properly designed and prepared concrete results in good strength and durable properties. The main ingredient in the conventional concrete is Portland cement. 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. For attaining a high strength and durable concrete for major applications in the constructions such as high-rise buildings, tall structures, nuclear power plants, etc., the essential need for additives both chemical and mineral is a must to improve the performance of concrete. Unlike other pozzolans, Metakaolin is a primary product, not a secondary (or) byproduct, this allows the manufacturing process to be structured to produce the optimum characteristics for the Metakaolin, ensuing the one production of a consistent product. Silica content of Metakaolin is 53% as against the minimum value of 35% stipulated in IS: 3812-1981. After calcination of kaolinite clay between 6500C and 8500C followed by grinding to a fineness of 15,000 m2/kg (B.E.T), Metakaolin is achieved as against the minimum value of 320 m2/kg stipulated by IS: 3812-1981. The fibres act as crack arrestor in the continuum and would substantially improve its static and dynamic properties. Since then lot of investigations have been carried out to extract the best usage of fibre-reinforced concrete. The role of fibres is essentially to arrest any advancing cracks by applying pinching forces at the crack tips, thus delaying their propagation across the matrix and creating stage. It is proposed to add crimped steel fibres to Ordinary Portland Cement concrete (OPCC) and Ternary blended concrete (Flyash & Metakaolin) for further enhancement of its strength and improvement with respect to its durability aspects. Flat steel crimped fibres and polypropylene fibres will be used in this investigation. The variables proposed in this investigation are fibre content of 0, 0.5, 1 and 1.5% and various aspect ratio of fibres. The present experimental investigation is an attempt to study the mechanical properties and durability aspects of ordinary Portland cement concrete, Hybrid fibre reinforced concrete, Ternary blended concrete and hybrid fibre reinforced ternary blended concrete. The experimental investigation proposed to use IS-code (IS-10262-1982) and ERNTROY AND SHACKLOCK’S METHOD of mix design M2O, procedure for designing high strength concrete. Linear regression equations will be proposed to quantify the effect of fibre addition on the above mechanical properties of mixes in terms of fibre factor.
Authors and Affiliations
NAGARAJA K and H. SUDARSANA RAO
Keywords
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