Effect of heat on mechanical properties of ternary blended recycled aggregate self-compacted concrete

• Published in: Materials today : proceedings 2021-01, Vol.38, p.3345-3350
• Main Authors: Siva Rama Krishna, S., Malagavelli, Venu, Vani, V.S.
• Format: Article
• Language: English
• Subjects: Metakaolin; Recycled aggregate; Residual strength; Slag cement; Ternary blende self-compacting concrete
• ISSN: 2214-7853; 2214-7853
• DOI: 10.1016/j.matpr.2020.10.244

Construction waste is gradually increasing day by day and it needs to be disposed (or) utilized safely. Few waste products like fly ash, slag, metakaolin (MK) are also need to be disposed. These wastes can be blended in self-compacting concrete which contribute to environmental sustainability. In the existing study Portland slag cement is exchanged by 10% Metakaolin (MK). Also natural aggregate (NA) is exchanged through 25% recycled coarse aggregate (RCA). In conclusion the ternary blended recycled aggregate self-compacting material (TB RCA SCC) is studied for its resistance to density, split tension and flexural strength at raised infections. The examples of standard cubes (l00 × 100 × 100 mm) for compression, Standard cylinders (150 × 300 mm) for split tension then Standard prisms (100 × 100 × 500 mm) for flexure are cast. After casting, the specimens are cured in water for 7, 28 and 56 days. Later specimens are showing to 27, 100, 200, 300, 400 and 500 °C temperatures with a duration ofexposure90 minutes at each temperature. The heated specimens are quenched in water and remove from water after they are cool towards room temperature. Then the specimens are tested for residual compression, residual split and residual flexural strengths. From the test results it is concluded that as the temperature increases the residual compressive, split tensile and flexural strength decreased at all ages. The strength differences between 0% and 25% replaced recycled aggregate for ternary blended recycled aggregate self-compacted concrete at all ages is minimal. The present study recommends SCC with replacement of coarse aggregate up to 25% with recycled coarse aggregate.