STUDY OF HIGH STRENGTH CONCRETE USING METAKAOLIN AT ELEVATED TEMPERATURES P.Muralinathan 1 , A.Joshua Daniel 2 , S.Sivakamasundari 3 1 M.Tech student in Department of Civil Engineering, SRMIST, Chennai, TN, India 2,3 Assitant professor, Department of Civil Engineering, SRMIST,Chennai, TN, India Abstract: Concrete is the most widely used construction material due to its economy and workability. Cement manufacturing leads to the destruction of natural resources there by emitting carbon dioxide into the atmosphere. Pozzolanic material in cement provides strength to the concrete. High strength concrete (HSC) is made by adding mineral admixtures to the concrete. In this study HSC is attained by replacing cement with Metakaolin for varying percentages. Metakaolin, an highly pozzolanic material is added to improve the strength by the formation of C-S-H gel which reduces the porosity in concrete. Metakaolin improves the pozzolanic reaction by filler effect and accelerate the hydration of cement. Super plasticizer is an inevitable material to reduce the water content and to balance the workability in HSC. In this study Metakaolin blended with concrete is exposed to elevated temperatures. Mechanical properties of Metakaolin blended HSC showed an improved performance when compared with the conventional concrete. Keywords: High strength concrete, Metakaolin, Mechanical property, C-S-H gel and Temperature 1. INTRODUCTION Concrete is a mixture of cement, aggregates and water. Concrete extensively leads to destruction of natural resources. Pozzolanic materials which improve the properties of concrete have been used in construction industry. Addition of pozzolanic materials improves workability, strength resistance to cracks and permeability of concrete. Past literature on addition of admixture improves the microstructure as well as decrease the calcium hydroxide concentration through pozzolanic reaction [1, 2, 3, 4]. High-strength concrete is typically categorized as concrete with compressive strength greater than 40 Mpa after 28 days of curing. ACI (American Concrete institute) defined “high-strength concrete as a concrete meeting special collage of performance and uniformity requirements that cannot always be accomplished routinely using conventional constituents and normal mixing, placing, and curing practice”. Generally construction industry needs rapid attainment of strength so that the projects can be completed in the scheduled time. This demand leads to high strength concrete, using mineral admixture and lower water- cement ratio using super plasticizer. Conplast SP430 has been used as a Super plasticizer to increase the workability with acceleration of strength gain at early ages of curing. The target water-cement ratio should be in the range 0.30–0.35. The mix design for HSC is calculated as per ACI 211.4R “Concrete Mix Proportioning- Guide lines” [5]. In this experimental work Metakaolin which is a high pozzolanic material is used for making high strength concrete by replacing with cement for different percentages ( 10%, 15%) also these Metakaolin blended concrete are subjected to a elevated temperatures like 100°C, 200 °C and 300 °C to find the behavior of concrete. 2. MATERIALS The materials used in the experimental work and their properties are summarized below: 2.1 Cement: Cement is the primary constituent for manufacturing concrete. Here Ordinary Portland Cement (53 grade) conforming to IS 12269: 1987 [6] is tested. Specific gravity of cement of used in this study is 3.09 2.2 Metakaolin: Metakaolin (Al2O3.2SiO2) is the white powder, manufactured by calcinations of pure kaolinite clay at a temperature range of 650 ° C to 850 ° C. The average particle size is 1.5μm and its corresponding specific gravity is 2.5. International Journal of Pure and Applied Mathematics Volume 119 No. 14 2018, 1267-1273 ISSN: 1314-3395 (on-line version) url: http://www.ijpam.eu Special Issue ijpam.eu 1267
STUDY OF HIGH STRENGTH CONCRETE USING METAKAOLIN AT ELEVATED TEMPERATURES
Apr 29, 2023
Welcome message from author
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Related Documents
