Use of Ceramic as Recycle Aggregate for the Development of Heat-Resisting Concrete

Abstract

India holds the esteemed position of being the second-largest producer and consumer of ceramic tiles worldwide. However, the ceramic industry generates substantial amounts of ceramic waste that adversely affects both humans and the environment. Concrete is a preferred building material due to its strength, durability, and versatility. However, it loses strength at high temperatures and needs to withstand high temperatures and carry loads in emergency situations. Therefore, ceramic tiles often discarded as waste, can find a new life and purpose in contributing to the thermal resilience of concrete structures exposed to high temperatures. This study describes a new model of the production of heat-resistant concrete in which ceramic waste as recycled aggregate is used. The goal of this study is to produce a heat resistant concrete mix design which can be suitable for use in a pit furnace where temperature ranges around 800°C to 1000°C subjected to heat. The current study is based on the assumption that ceramic tiles prepared at a high temperature may be suitable for the production of concrete resistant to elevated temperatures, since the characteristics of concrete exposed to elevated temperatures primarily depend on the types of cement and aggregate used. The specimens are exposed to high temperatures of 350°C, 750°C, and 950°C and are tested in muffle furnace for 480 min. Initially ground-granulated blast furnace slag cement (GGBS) and portland slag cement (PSC) compared with ordinary portland cement (OPC) are used as the cement binder for the concrete. The concrete with different cement mix is subjected to compressive strength at 7 day curing age exposed to elevated temperatures to determine the final cement binder used for further investigation. Two types of ceramic waste obtained from Morbi city namely, CTWA- 0 and CTWA- 18 having different water absorption are used in experimental investigation. The physical and mechanical properties of aggregate is studied. The optimize heat resisting concrete mix design of M30 grade is developed by using PSC as cement binder and CTWA-0 as replacement of 10mm. The CTWA-0 is use as natural coarse aggregate in different replacement ratio 20%, 40%, 60%, in heat resisting concrete mix design. The specimens subjected to elevated temperature is studied for its physical behaviour such as colour change, surface cracking and thermal spalling. For the mechanical properties compressive strength at 7 day and 28 day curing age is performed along with split tensile strength and flexural xii strength at 28 day curing age is studied in which HRC-40 outperforms other mixes. The durable properties like water impermeability test and rapid chloride penetration test and non-destructive tests such as rebound hammer test and ultrasonic pulse velocity is studied under 750°C. The HRC-40 showed superior results than others suggesting that the mix possessed higher density and fewer internal voids and cracks even after being subjected to 750°C.