Abstract
AbstractA pozzolanic material ordinarily contains high amounts of siliceous or aluminous components, but has no cementitious property until when it reacts with calcium hydroxide, that is available in cement, in the presence of moisture. The present study evaluates the pozzolanicity of ceramic tile powder and its effect on both hydration mechanism and strength property of recycled aggregate concrete. It was seen that ceramic floor and wall tiles sourced from construction and demolition wastes, contain high silica and alumina oxides, which evidently showcased its pozzolanicity. This was further revealed by the microstructural images of ceramic blended cement. Strength properties of recycled aggregate concrete were enhanced with addition of ceramic powder and ceramic coarse fraction, more than the strength developed in the control concrete. The increased strength was an indication that the interfacial transition zone between the aggregate and blended cement paste enhanced the properties of recycled aggregate...
Highlights
About 900 million tons of construction and demolition (C&D) wastes are generated every year in Europe, USA and Japan, according to the report of World Business council for sustainable development (WBCFS Development, 2014)
Studies conducted on the performance of ceramics as aggregates and supplementary cementitious material in concrete (Bignozzi & Bonduà, 2011; Llamas, Juan, Moran, & Guerra, 2007; Sánchez de Rojas, Marín, Rivera, & Frías, 2006), have shown that similar mechanical characteristics exist between concrete made with ceramic and the conventional concrete
Based on the optimization tests which was done at 95% confidence prediction, it was revealed that a mix combination of 25.89% ceramic powder, 1.85% recycled aggregate concrete (RAC), 77.84% ceramic coarse, and 20.31% gravel would yield a compressive strength of 27.53 MPa and split tensile strength of 3.85 MPa after 28 days of curing
Summary
About 900 million tons of construction and demolition (C&D) wastes are generated every year in Europe, USA and Japan, according to the report of World Business council for sustainable development (WBCFS Development, 2014). Out of many means of sustainable development pursued for decades, C&D wastes maintain constant consideration by researchers as potential alternative to the natural aggregates. Industries expend notable amount on transportation and their disposal, which are ever increasing as result of continuous industrial development (Topçu & Günçan, 1995) This large amount of generated wastes, are still under investigation for their potential use as supplementary materials for construction industry. In previous studies on the use of C&D wastes (Halicka, Ogrodnik, & Zegardlo, 2013; Lucas, de Brito, Veiga, & Farinha, 2016; Medina, Sánchez de Rojas, Thomas, Polanco, & Frías, 2016), extensive information are available on the mechanical and physical properties of RAC made with sanitary wares and electrical insulators as aggregates. This study focused on the use of combination of: gravel, waste ceramic tile and rubbles as coarse aggregate for concreting, while ceramic tile powder is to replace Portland cement in varying proportions
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