Modelling the effect of temperature on the physical and mechanical properties of ceramic composites filled with foundry sand waste

Abstract

The aim of this research is to describe the temperature effect on the water absorption, linear shrinkage, density and compressive strength of ceramic composites produced by mixing clay with additions of foundry sand waste from 20% to 40% wt. Previous studies have shown that foundry sands can be recycled due to the high content of SiO2 on its chemical composition, therefore, in this research is proposed as an alternative raw material in ceramic bodies. Prototypes were shaped by uniaxial pressing method and fired at three different temperatures (850°C, 950°C and 1,050°C) in order to promote the formation of the ceramic phases. Physical and mechanical properties were measured based on the procedures specified by standard ASTM C373 and ASTM C773-88. It was found that at 1,050°C properties such as mechanical strength and density reach its maximum values, effect that might be associated to the reduction in pore size inside the microstructure during calcination. The main merit of the models obtained is offer a valuable tool to set up a proper thermal process in order to obtain eco-friendly ceramic samples with physical and mechanical properties at its optimum values, reducing environmental problems related to landfill disposal and minimizing costs of manufacturing.

Reuse or Disposal of Waste Foundry Sand: An Insight into Environmental Aspects

“…Table 1 shows the chemical composition of virgin foundry sands (VFS) usually adopted in the foundries. To limit the amount of WFS landfilled, numerous studies have been conducted in recent years to evaluate its reuse as a secondary raw material in various sectors: cement factories [8,9]; concrete [2,[5][6][7]; ceramic [16][17][18][19]; and glass industries [20,21]. To evaluate the correspondence with the characteristics required in the various areas, the WFS are subjected to chemical analyses and leaching tests to verify the release of substances that could create risks for human health and the environment.…”

“…The main options for WFS reuse are the replacement of fine aggregate in concrete [2,[5][6][7], cement factories [8,9], brick furnaces [10][11][12], embankments [13,14] or structural fills [14,15]; some studies guarantee their suitability for the ceramic [16][17][18][19] and glass sectors [20,21] but to date there are no full-scale applications. The unbound applications of WFS that do not involve their immobilization in a matrix are widely used worldwide; this type of use requires greater attention, as WFS, in contact with rainwater, can release contaminants that can affect the conditions of surface and groundwater, increasing risks for human health and the environment.…”

Escenarios de contaminación atmosférica generados por la gestión de residuos sólidos: un reto actual en el departamento de Boyacá, Colombia

“…-Ubaque & Vaca-Bohórquez, 2021;Eriksson et al, 2005;Roa et al, 2019), the inadequate management of solid waste in cities is a triggering factor of atmospheric pollution by releasing a wide variety of particles and gases, which are the result of the damming of significant amounts of organic matter and other decomposing waste. Among the gases released are short-lived climate pollutants (SLCPs), especially methane (CH 4 ), black carbon (BC) and tropospheric ozone (O 3 ), as well as greenhouse gases, such as carbon dioxide (CO 2 ).…”